CA2384104A1 - Use of semaphorin for modulation of cellular efflux - Google Patents
Use of semaphorin for modulation of cellular efflux Download PDFInfo
- Publication number
- CA2384104A1 CA2384104A1 CA002384104A CA2384104A CA2384104A1 CA 2384104 A1 CA2384104 A1 CA 2384104A1 CA 002384104 A CA002384104 A CA 002384104A CA 2384104 A CA2384104 A CA 2384104A CA 2384104 A1 CA2384104 A1 CA 2384104A1
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- CA
- Canada
- Prior art keywords
- semaphorin
- leu
- cell
- polypeptide
- ser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Abstract
The present invention is directed to compositions and methods comprising the use of semaphorins, semaphorin receptors, and polynucleotides encoding semaphorins and semaphorin receptors, for the modulation of cellular efflux mumps. Included in the present invention are compositions and methods for control of multiple drug resistance phenotypes via control of cellular efflux.
Description
SEMAPHORIN MODULATION OF CELLULAR EFFLUX
This application claims priority to United States provisional patent application serial number 60/152,914 filed September 8, 1999, now abandoned; United States provisional patent application serial number 60/156,257, filed September 27, 1999, now abandoned; and United States provisional patent application serial number 60/173,906 filed December 29, 1999, now abandoned.
I. FIELD OF THE INVENTION
The present invention relates to compositions and methods useful in manipulating cellular efflux mechanisms resulting in multiple drug resistance (MDR). More specifically, the present invention relates to the use of semaphorin or semaphorin receptor polypeptides, as well as polynucleotides encoding these polypeptides, to modulate cellular efflux or the MDR phenotype of cells.
II. BACKGROUND OF THE INVENTION
In response to unavoidable continuous exposure to a frequently hostile environment, cells have developed a multitude of mechanisms to prevent entry or to accelerate exit of noxious substances from the infra-cellular space. This "cellular Darwinism" is accepted as a basic tool of survival, but, once applied by targeted cells to cytotoxic drugs, the phenomenon interferes with the effectiveness of chemotherapies for an array of diseases such as cancer and HIV. As the result of a wide spectrum of highly effective systems, drug resistance, whatever its source, is a prevalent cause for chemotherapeutic failure.
When cellular resistance to one drug results in resistance to a wide array of chemical agents, including those that are not related to the substance originally inducing the resistance, the cell is regarded as having developed multidrug resistance, or MDR. Thus, MDR is a cellular phenomenon characterized by resistance of the cell to cytotoxic substances. Generally, MDR develops in response to a specific cytotoxic substance, but then confers resistance to an array of cytotoxic substances or conditions. Cells that have developed MDR are considered MDR phenotypic cells, and are further described as those cells that have an increased ability, relative to non-MDR
cells, to survive in the presence of cytotoxic substances or cytotoxic conditions. The increased survival rates of MDR
phenotypic cells is characteristically due to an increased cellular capacity to efflux or expel from the cell substances that are either cytotoxic in themselves, or are present in the cell in cytotoxic amounts, thereby creating a cytotoxic condition for the cell. In an attempt to understand and control MDR, many investigators have studied the various mechanisms thought to drive it.
See Kellen, Alternative Mechanisms of Multidru~ Resistance in Cancer, (1995). MDR phenotypes of cancer or other cells may arise as a result of MDR proteins, or MDR-like proteins, or various other mechanisms involving efflux pumps. Cellular efflux pumps involved in the development of MDR
phenotypic cells include those that are able to efflux molecules of many different sizes and compositions, as well as protons or chloride ions. For example, MDR protein pumps include the proteins MDR-1 and MDR-2, which are each considered to be a P-glycoprotein (P-gp), and the human multiple drug resistance associated protein designated "MRP" (see, Zaman, et al., 1994). These and other MDR
proteins are transmembrane efflux pumps that, based on studies in the mouse, are believed to be important in S removing toxins from the cell.
Various assays that have been developed to allow the study of exchange of molecules across membranes are employed in the study of MDR proteins. For example, many lipophilic, cationic dyes have been described that allow one to follow changes in membrane potential, or changes in intracellular pH. One such dye, Rhodamine 123 (Rh123) was frequently used by hematologists to measure mitochondrial membrane potential, and has been described as a substrate for MDR proteins.
Kim et.al., (1998). Consistent with the reported transport of protons, expression of the MDR protein P-gp has been associated with a significant elevation of intracellular pH
(Weisburg et al, 1999).
Further, MDR phenotypes are reported to arise in some cell types as a result of alterations in the acidification (pH) of intracellular organelles and compartments, such as the trans-golgi network 1 S and the endocytic pathway (see, e.g., Altan, et al., Altan, N et al., Chen, Y et al., Schindler, et al.).
One mechanism for controlling the pH of intracellular compartments is by cellular pumps that operate to move protons, or negatively charged ions like chloride ions, across membranes. Such cellular pumps are implicated in certain diseases. For example, unregulated activity of a chloride pump is known to be at least partially responsible for the development of cystic fibrosis resulting from a genetic defect. Alternatively, growth factors are theorized to play a non-efflux-related role in MDR.
For example, semaphorins have been postulated to function as growth factors, and thereby exert an effect on cells that may contribute to the development of drug resistance (Yamada, et al.).
In light of the various relationships between cellular efflux pumps and MDR, the ability to control such efflux pumps would provide the ability to promote or suppress the development of MDR
in cells. Accordingly, investigation into MDR mechanisms, and various methods for controlling MDR
via control of cellular efflux mechanisms is ongoing.
III. SUMMARY OF THE INVENTION
The present invention teaches the use of semaphorin or semaphorin receptor polypeptides to modulate the activity of cellular efflux pumps. The present invention further teaches that semaphorin or semaphorin receptor polypeptides can be used to specifically activate or inhibit cellular efflux pumps and therefore may induce or inhibit the development of multiple drug resistant cells. The present invention further provides compositions and methods for the treatment of neoplasms, autoimmune or immuno-deficiency disorders such as HIV, and other cellular-efflux-related disease states.
The present invention specifically contemplates that any semaphorin polypeptide, or active fragment of a semaphorin polypeptide, may be used in the disclosed compositions and methods.
Exemplary semaphorins include, for example and without limitation: AHV Sema;
A39R; Sema I, including G-sema I and D-sema-I; Sema II; Sema III; Sema IV; DC Sema; CD100; Z
SMF-7; Sema A;
Sema B; Sema C; Sema D; Sema E; Sema H; Sema L; Sema W and Sema Y.
Additionally, useful fragments of any semaphorin, such as the sema domain or the active domain may also be used according to the present invention. For additional semaphorins that can be used in the presently disclosed compositions and methods, see Bamberg, et.al. Cell, 97:551 and United States Patent No.
5,935,865 to Goodman et al. In alternative embodiments of the present invention, such as in "gene therapeutics," nucleic acid sequences encoding any of these semaphorins or their fragments can be used.
Similarly, preferred semaphorin receptor polypeptides for use in the presently disclosed compositions and methods include those semaphorin receptors known as plexins, as well as their complements, variants and useful fragments such as soluble portions of the receptors, fragments including the sema domain of the plexins, and fragments including the active sites of the plexins. A
particularly preferred plexin for use according to the present invention is the Viral-Encoded Semaphorin Receptor ("VESPR"), as well as complements, variants, and soluble fragments thereof.
Particularly preferred polypeptide sequences include the polypeptide sequence of SEQ ID N0:2.
Additionally, useful soluble forms of the VESPR polypeptide include those segments of the polypeptide comprising a portion of the extracellular domain of the receptor.
An example of a soluble VESPR polypeptide includes amino acids 1-944 of SEQ ID N0:2. In addition, truncated soluble VESPR proteins comprising less that the entire extracellular domain are included in the invention, e.g., amino acids 35-944. Also encompassed within the present invention are the nucleic acid sequences encoding such useful VESPR polypeptides and polypeptide fragments.
Particularly preferred nucleic acid sequences include the polynucleotide sequence of SEQ 1D NO:1; and those segments of SEQ ID
NO:1 that encode the soluble fragments of VESPR outlined above. The VESPR, its useful fragments, complements, variants, and combinations, such as fusion proteins as well as the nucleic acid sequences encoding these polypeptides are described in co-pending application SN
08/958,598 (specifically incorporated herein by reference, in its entirety). In embodiments of the present invention employing nucleic acid sequences, such as in "gene therapeutics," nucleic acid sequences encoding any of these semaphorin receptor polypeptides or their fragments can be used.
In a preferred embodiment, the present invention provides a pharmaceutical composition for the treatment of MDR phenotypic cells. This composition comprises an amount of a semaphorin or a semaphorin receptor polypeptide such that administration of the composition is effective to modulate the MDR phenotype of the target cells. Alternatively, in another aspect of the invention, the composition further includes an amount of an expression vector including a nucleic acid sequence encoding a semaphorin, a semaphorin receptor, or a useful fragment of a semaphorin or semaphorin receptor, such that administration of the composition is effective to modulate the MDR phenotype of the target cell. This modulation may be to either promote or inhibit the development of multiple drug S resistant cells.
An alternative embodiment of the present invention provides another pharmaceutical composition for the treatment of MDR phenotypic cells. In this aspect, the presently disclosed composition includes an amount of an agonist or antagonist for a semaphorin or a semaphorin receptor, such that administration of the composition is effective to promote or inhibit the development of MDR phenotype. Exemplary agonists or antagonists for semaphorins or semaphorin receptors include antibodies, such as, for example, either polyclonal or monoclonal antibodies, antigens and small molecules.
For example, a composition of the present invention can use a semaphorin antagonist, in the form of a soluble semaphorin receptor for example, to inhibit induction or activation of cellular efflux pumps. Use of such a composition allows one to decrease the ability of a cell to expel agents crossing the cell membrane, such as cytotoxic therapeutic agents. Alternatively or additionally, a composition of the present invention can include an antibody to a semaphorin receptor such as VESPR, which can function as either an antagonist or an agonist, or a small molecule agonist of a semaphorin receptor such as VESPR can be used.
In another embodiment, the present invention provides a pharmaceutical composition, for the treatment of cellular efflux-related disease states. In this aspect, the composition includes an amount of a semaphorin or semaphorin receptor such that administration of the composition is effective to modulate cellular efflux. Alternatively, in this aspect of the invention, the composition includes an amount of an expression vector including a nucleic acid sequence encoding a semaphorin, a semaphorin receptor, or encoding a useful fragment of a semaphorin or semaphorin receptor, such that administration of the composition is effective to modulate cellular efflux of the target cells. The active polypeptide or nucleic acid sequences of the composition used in this aspect of the invention may function to activate or up-regulate, or to inhibit or down-regulate, cellular efflux.
In an alternative embodiment, the present invention provides another composition for the treatment of cellular efflux-related disease states. In this embodiment, the disclosed composition includes an amount of an agonist or antagonist of a semaphorin or semaphorin receptor, such that administration of the composition is effective in activating or inhibiting cellular efflux in the target cell. Exemplary agonists or antagonists for semaphorins or semaphorin receptors include antibodies, such as, for example, either polyclonal or monoclonal antibodies; antigens and small molecules.
In another aspect, the present invention provides a method of modulating cellular efflux by administering to a cell an effective amount of a composition including a semaphorin or semaphorin receptor polypeptide such that cellular efflux is activated or inhibited.
Alternatively, the present invention provides a method of modulating cellular efflux comprising administering to a cell, via an appropriate vector, an effective amount of a polynucleotide encoding a semaphorin, a semaphorin receptor, or a useful fragment of a semaphorin or semaphorin receptor, such that cellular efflux is activated or inhibited. Additionally, the presently disclosed methods of modulating cellular efflux, may comprise administering to a cell an effective amount of an agonist or antagonist of a semaphorin or semaphorin receptor such that cellular efflux is activated or inhibited.
Exemplary useful agonists or antagonists include antibodies such as, for example, monoclonal or polyclonal antibodies, an antigen, or a small molecule. In a particularly preferred embodiment, the antibody used is an antibody to VESPR.
Pharmaceutical compositions and methods of the presently disclosed invention may be useful in the treatment of cellular efflux-related disease states such as multiple drug resistance; cancers, or other neoplastic diseases such as tumors, leukemia, lymphoma or other localized or metastatic conditions characterized by an abnormal proliferation of cells, generally due to cells continuing to replicate after the stimuli that initiated growth has ceased; cystic fibrosis arising from the treatment of a cell or group of cells with cytotoxic agents; auto-immune disorders; or acquired or genetically-based immunodeficiency disorders such as that resulting from the human immunodeficiency virus (HIV).
Formulation of any of the presently disclosed compositions for administration according to the disclosed methods can be done in any manner known to those of skill in the art. Such formulations will vary according to variables such as, for example, the needs of the formulator, the intended route of administration, the targeted disease or tissue, and the subject being treated.
Specifically, unit doses may be formulated in multi-dose containers including additives such as a carrier, other excipients, and a preservative component.
The disclosed compositions may be formulated in a variety of concentrations in various vial sizes for various administration dosages. The presently disclosed compositions may also be in virtually any form including an aqueous solution, a suspension, a lyophilized form that may be reconstituted when appropriate, a gel, an aerosol, or any other form or state convenient for administration to treat the described disorders. The compositions as described herein may be formulated so that they are contained in a vial, bottle, tube, syringe, inhaler, transdermal patch, capsule or other container for single or multiple administrations.
In alternative embodiments, the presently disclosed compositions are formulated with or administered in conjunction with additional active agents such as chemotherapeutic agents, immune suppressants or radiation therapy. For example, agents that may be useful to co-formulate or administer in conjunction with the disclosed compositions include virtually any chemotherapeutic or sensitizing agent such as cyclosporin, FK506, taxotere, doxorubicin, cis-platin, tamoxifen, i-phosphamide, or methotrexate, or variants of any of these compounds.
Alternatively or additionally, the presently disclosed compositions may be further co-administered with an immune suppressant, such as a cytokine, IL-4, IL-12, , GM-CSF, G-CSF, M-CSF, a-interferon, ~i-interferon, or Y-interferon. The additional agents may be co-administered simultaneously or sequentially relative to the disclosed compositions and methods.
In another aspect, the present invention provides various assays and screening methods to identify substances that may be used to influence the MDR phenotype of a cell.
For example, the present invention provides a method of detecting the ability of a test compound to affect the MDR
phenotype of a cell, in which the following steps are used: (1) contacting a first cell with a test compound and a semaphorin or a semaphorin receptor, in the presence of a cytotoxic agent; (2) measuring the rate of death of the first cell; (3) observing the rate of death of a control cell in the absence of the test compound; and (4) comparing the rate of death of the first cell to the rate of death 1 S of the control cell. Upon comparison, a difference in the rate of cell death of the first cell relative to the control cell indicates that the test compound is an effector of MDR
phenotype. In this manner, the effector can be identified as a substance that either promotes development of MDR phenotype or inhibits development of MDR phenotype. The affector can then be used therapeutically.
Alternatively, the test compound may itself be a semaphorin or semaphorin receptor or fragment or antagonist or agonist thereof.
This method can be performed with a cytotoxic or sensitizing agent such as, for example, tamoxifen, cisplatin, doxorubicin, radiation, methotrexate, cyclosporin, taxotere, FK506, or i-phosphamide. Further, as with all compositions and methods of the present invention, the semaphorin or semaphorin receptor used in this method can be any known semaphorin or receptor polypeptide or useful fragment thereof, such as a fragment comprising the sema domain or the active domain of a semaphorin or semaphorin receptor. Additionally or alternatively, the presently disclosed method can be performed with any known semaphorin or semaphorin receptor, or fragment thereof being the test compound, or with an antibody to VESPR as the test compound.
In another aspect, the present invention provides a method of detecting the ability of a test compound to effect the MDR phenotype of a cell by modulating cellular efflux in the cell. Such a method would involve, for example, the following steps: (1) contacting a first cell with a test compound and a semaphorin or semaphorin receptor, in the presence of a dye;
This application claims priority to United States provisional patent application serial number 60/152,914 filed September 8, 1999, now abandoned; United States provisional patent application serial number 60/156,257, filed September 27, 1999, now abandoned; and United States provisional patent application serial number 60/173,906 filed December 29, 1999, now abandoned.
I. FIELD OF THE INVENTION
The present invention relates to compositions and methods useful in manipulating cellular efflux mechanisms resulting in multiple drug resistance (MDR). More specifically, the present invention relates to the use of semaphorin or semaphorin receptor polypeptides, as well as polynucleotides encoding these polypeptides, to modulate cellular efflux or the MDR phenotype of cells.
II. BACKGROUND OF THE INVENTION
In response to unavoidable continuous exposure to a frequently hostile environment, cells have developed a multitude of mechanisms to prevent entry or to accelerate exit of noxious substances from the infra-cellular space. This "cellular Darwinism" is accepted as a basic tool of survival, but, once applied by targeted cells to cytotoxic drugs, the phenomenon interferes with the effectiveness of chemotherapies for an array of diseases such as cancer and HIV. As the result of a wide spectrum of highly effective systems, drug resistance, whatever its source, is a prevalent cause for chemotherapeutic failure.
When cellular resistance to one drug results in resistance to a wide array of chemical agents, including those that are not related to the substance originally inducing the resistance, the cell is regarded as having developed multidrug resistance, or MDR. Thus, MDR is a cellular phenomenon characterized by resistance of the cell to cytotoxic substances. Generally, MDR develops in response to a specific cytotoxic substance, but then confers resistance to an array of cytotoxic substances or conditions. Cells that have developed MDR are considered MDR phenotypic cells, and are further described as those cells that have an increased ability, relative to non-MDR
cells, to survive in the presence of cytotoxic substances or cytotoxic conditions. The increased survival rates of MDR
phenotypic cells is characteristically due to an increased cellular capacity to efflux or expel from the cell substances that are either cytotoxic in themselves, or are present in the cell in cytotoxic amounts, thereby creating a cytotoxic condition for the cell. In an attempt to understand and control MDR, many investigators have studied the various mechanisms thought to drive it.
See Kellen, Alternative Mechanisms of Multidru~ Resistance in Cancer, (1995). MDR phenotypes of cancer or other cells may arise as a result of MDR proteins, or MDR-like proteins, or various other mechanisms involving efflux pumps. Cellular efflux pumps involved in the development of MDR
phenotypic cells include those that are able to efflux molecules of many different sizes and compositions, as well as protons or chloride ions. For example, MDR protein pumps include the proteins MDR-1 and MDR-2, which are each considered to be a P-glycoprotein (P-gp), and the human multiple drug resistance associated protein designated "MRP" (see, Zaman, et al., 1994). These and other MDR
proteins are transmembrane efflux pumps that, based on studies in the mouse, are believed to be important in S removing toxins from the cell.
Various assays that have been developed to allow the study of exchange of molecules across membranes are employed in the study of MDR proteins. For example, many lipophilic, cationic dyes have been described that allow one to follow changes in membrane potential, or changes in intracellular pH. One such dye, Rhodamine 123 (Rh123) was frequently used by hematologists to measure mitochondrial membrane potential, and has been described as a substrate for MDR proteins.
Kim et.al., (1998). Consistent with the reported transport of protons, expression of the MDR protein P-gp has been associated with a significant elevation of intracellular pH
(Weisburg et al, 1999).
Further, MDR phenotypes are reported to arise in some cell types as a result of alterations in the acidification (pH) of intracellular organelles and compartments, such as the trans-golgi network 1 S and the endocytic pathway (see, e.g., Altan, et al., Altan, N et al., Chen, Y et al., Schindler, et al.).
One mechanism for controlling the pH of intracellular compartments is by cellular pumps that operate to move protons, or negatively charged ions like chloride ions, across membranes. Such cellular pumps are implicated in certain diseases. For example, unregulated activity of a chloride pump is known to be at least partially responsible for the development of cystic fibrosis resulting from a genetic defect. Alternatively, growth factors are theorized to play a non-efflux-related role in MDR.
For example, semaphorins have been postulated to function as growth factors, and thereby exert an effect on cells that may contribute to the development of drug resistance (Yamada, et al.).
In light of the various relationships between cellular efflux pumps and MDR, the ability to control such efflux pumps would provide the ability to promote or suppress the development of MDR
in cells. Accordingly, investigation into MDR mechanisms, and various methods for controlling MDR
via control of cellular efflux mechanisms is ongoing.
III. SUMMARY OF THE INVENTION
The present invention teaches the use of semaphorin or semaphorin receptor polypeptides to modulate the activity of cellular efflux pumps. The present invention further teaches that semaphorin or semaphorin receptor polypeptides can be used to specifically activate or inhibit cellular efflux pumps and therefore may induce or inhibit the development of multiple drug resistant cells. The present invention further provides compositions and methods for the treatment of neoplasms, autoimmune or immuno-deficiency disorders such as HIV, and other cellular-efflux-related disease states.
The present invention specifically contemplates that any semaphorin polypeptide, or active fragment of a semaphorin polypeptide, may be used in the disclosed compositions and methods.
Exemplary semaphorins include, for example and without limitation: AHV Sema;
A39R; Sema I, including G-sema I and D-sema-I; Sema II; Sema III; Sema IV; DC Sema; CD100; Z
SMF-7; Sema A;
Sema B; Sema C; Sema D; Sema E; Sema H; Sema L; Sema W and Sema Y.
Additionally, useful fragments of any semaphorin, such as the sema domain or the active domain may also be used according to the present invention. For additional semaphorins that can be used in the presently disclosed compositions and methods, see Bamberg, et.al. Cell, 97:551 and United States Patent No.
5,935,865 to Goodman et al. In alternative embodiments of the present invention, such as in "gene therapeutics," nucleic acid sequences encoding any of these semaphorins or their fragments can be used.
Similarly, preferred semaphorin receptor polypeptides for use in the presently disclosed compositions and methods include those semaphorin receptors known as plexins, as well as their complements, variants and useful fragments such as soluble portions of the receptors, fragments including the sema domain of the plexins, and fragments including the active sites of the plexins. A
particularly preferred plexin for use according to the present invention is the Viral-Encoded Semaphorin Receptor ("VESPR"), as well as complements, variants, and soluble fragments thereof.
Particularly preferred polypeptide sequences include the polypeptide sequence of SEQ ID N0:2.
Additionally, useful soluble forms of the VESPR polypeptide include those segments of the polypeptide comprising a portion of the extracellular domain of the receptor.
An example of a soluble VESPR polypeptide includes amino acids 1-944 of SEQ ID N0:2. In addition, truncated soluble VESPR proteins comprising less that the entire extracellular domain are included in the invention, e.g., amino acids 35-944. Also encompassed within the present invention are the nucleic acid sequences encoding such useful VESPR polypeptides and polypeptide fragments.
Particularly preferred nucleic acid sequences include the polynucleotide sequence of SEQ 1D NO:1; and those segments of SEQ ID
NO:1 that encode the soluble fragments of VESPR outlined above. The VESPR, its useful fragments, complements, variants, and combinations, such as fusion proteins as well as the nucleic acid sequences encoding these polypeptides are described in co-pending application SN
08/958,598 (specifically incorporated herein by reference, in its entirety). In embodiments of the present invention employing nucleic acid sequences, such as in "gene therapeutics," nucleic acid sequences encoding any of these semaphorin receptor polypeptides or their fragments can be used.
In a preferred embodiment, the present invention provides a pharmaceutical composition for the treatment of MDR phenotypic cells. This composition comprises an amount of a semaphorin or a semaphorin receptor polypeptide such that administration of the composition is effective to modulate the MDR phenotype of the target cells. Alternatively, in another aspect of the invention, the composition further includes an amount of an expression vector including a nucleic acid sequence encoding a semaphorin, a semaphorin receptor, or a useful fragment of a semaphorin or semaphorin receptor, such that administration of the composition is effective to modulate the MDR phenotype of the target cell. This modulation may be to either promote or inhibit the development of multiple drug S resistant cells.
An alternative embodiment of the present invention provides another pharmaceutical composition for the treatment of MDR phenotypic cells. In this aspect, the presently disclosed composition includes an amount of an agonist or antagonist for a semaphorin or a semaphorin receptor, such that administration of the composition is effective to promote or inhibit the development of MDR phenotype. Exemplary agonists or antagonists for semaphorins or semaphorin receptors include antibodies, such as, for example, either polyclonal or monoclonal antibodies, antigens and small molecules.
For example, a composition of the present invention can use a semaphorin antagonist, in the form of a soluble semaphorin receptor for example, to inhibit induction or activation of cellular efflux pumps. Use of such a composition allows one to decrease the ability of a cell to expel agents crossing the cell membrane, such as cytotoxic therapeutic agents. Alternatively or additionally, a composition of the present invention can include an antibody to a semaphorin receptor such as VESPR, which can function as either an antagonist or an agonist, or a small molecule agonist of a semaphorin receptor such as VESPR can be used.
In another embodiment, the present invention provides a pharmaceutical composition, for the treatment of cellular efflux-related disease states. In this aspect, the composition includes an amount of a semaphorin or semaphorin receptor such that administration of the composition is effective to modulate cellular efflux. Alternatively, in this aspect of the invention, the composition includes an amount of an expression vector including a nucleic acid sequence encoding a semaphorin, a semaphorin receptor, or encoding a useful fragment of a semaphorin or semaphorin receptor, such that administration of the composition is effective to modulate cellular efflux of the target cells. The active polypeptide or nucleic acid sequences of the composition used in this aspect of the invention may function to activate or up-regulate, or to inhibit or down-regulate, cellular efflux.
In an alternative embodiment, the present invention provides another composition for the treatment of cellular efflux-related disease states. In this embodiment, the disclosed composition includes an amount of an agonist or antagonist of a semaphorin or semaphorin receptor, such that administration of the composition is effective in activating or inhibiting cellular efflux in the target cell. Exemplary agonists or antagonists for semaphorins or semaphorin receptors include antibodies, such as, for example, either polyclonal or monoclonal antibodies; antigens and small molecules.
In another aspect, the present invention provides a method of modulating cellular efflux by administering to a cell an effective amount of a composition including a semaphorin or semaphorin receptor polypeptide such that cellular efflux is activated or inhibited.
Alternatively, the present invention provides a method of modulating cellular efflux comprising administering to a cell, via an appropriate vector, an effective amount of a polynucleotide encoding a semaphorin, a semaphorin receptor, or a useful fragment of a semaphorin or semaphorin receptor, such that cellular efflux is activated or inhibited. Additionally, the presently disclosed methods of modulating cellular efflux, may comprise administering to a cell an effective amount of an agonist or antagonist of a semaphorin or semaphorin receptor such that cellular efflux is activated or inhibited.
Exemplary useful agonists or antagonists include antibodies such as, for example, monoclonal or polyclonal antibodies, an antigen, or a small molecule. In a particularly preferred embodiment, the antibody used is an antibody to VESPR.
Pharmaceutical compositions and methods of the presently disclosed invention may be useful in the treatment of cellular efflux-related disease states such as multiple drug resistance; cancers, or other neoplastic diseases such as tumors, leukemia, lymphoma or other localized or metastatic conditions characterized by an abnormal proliferation of cells, generally due to cells continuing to replicate after the stimuli that initiated growth has ceased; cystic fibrosis arising from the treatment of a cell or group of cells with cytotoxic agents; auto-immune disorders; or acquired or genetically-based immunodeficiency disorders such as that resulting from the human immunodeficiency virus (HIV).
Formulation of any of the presently disclosed compositions for administration according to the disclosed methods can be done in any manner known to those of skill in the art. Such formulations will vary according to variables such as, for example, the needs of the formulator, the intended route of administration, the targeted disease or tissue, and the subject being treated.
Specifically, unit doses may be formulated in multi-dose containers including additives such as a carrier, other excipients, and a preservative component.
The disclosed compositions may be formulated in a variety of concentrations in various vial sizes for various administration dosages. The presently disclosed compositions may also be in virtually any form including an aqueous solution, a suspension, a lyophilized form that may be reconstituted when appropriate, a gel, an aerosol, or any other form or state convenient for administration to treat the described disorders. The compositions as described herein may be formulated so that they are contained in a vial, bottle, tube, syringe, inhaler, transdermal patch, capsule or other container for single or multiple administrations.
In alternative embodiments, the presently disclosed compositions are formulated with or administered in conjunction with additional active agents such as chemotherapeutic agents, immune suppressants or radiation therapy. For example, agents that may be useful to co-formulate or administer in conjunction with the disclosed compositions include virtually any chemotherapeutic or sensitizing agent such as cyclosporin, FK506, taxotere, doxorubicin, cis-platin, tamoxifen, i-phosphamide, or methotrexate, or variants of any of these compounds.
Alternatively or additionally, the presently disclosed compositions may be further co-administered with an immune suppressant, such as a cytokine, IL-4, IL-12, , GM-CSF, G-CSF, M-CSF, a-interferon, ~i-interferon, or Y-interferon. The additional agents may be co-administered simultaneously or sequentially relative to the disclosed compositions and methods.
In another aspect, the present invention provides various assays and screening methods to identify substances that may be used to influence the MDR phenotype of a cell.
For example, the present invention provides a method of detecting the ability of a test compound to affect the MDR
phenotype of a cell, in which the following steps are used: (1) contacting a first cell with a test compound and a semaphorin or a semaphorin receptor, in the presence of a cytotoxic agent; (2) measuring the rate of death of the first cell; (3) observing the rate of death of a control cell in the absence of the test compound; and (4) comparing the rate of death of the first cell to the rate of death 1 S of the control cell. Upon comparison, a difference in the rate of cell death of the first cell relative to the control cell indicates that the test compound is an effector of MDR
phenotype. In this manner, the effector can be identified as a substance that either promotes development of MDR phenotype or inhibits development of MDR phenotype. The affector can then be used therapeutically.
Alternatively, the test compound may itself be a semaphorin or semaphorin receptor or fragment or antagonist or agonist thereof.
This method can be performed with a cytotoxic or sensitizing agent such as, for example, tamoxifen, cisplatin, doxorubicin, radiation, methotrexate, cyclosporin, taxotere, FK506, or i-phosphamide. Further, as with all compositions and methods of the present invention, the semaphorin or semaphorin receptor used in this method can be any known semaphorin or receptor polypeptide or useful fragment thereof, such as a fragment comprising the sema domain or the active domain of a semaphorin or semaphorin receptor. Additionally or alternatively, the presently disclosed method can be performed with any known semaphorin or semaphorin receptor, or fragment thereof being the test compound, or with an antibody to VESPR as the test compound.
In another aspect, the present invention provides a method of detecting the ability of a test compound to effect the MDR phenotype of a cell by modulating cellular efflux in the cell. Such a method would involve, for example, the following steps: (1) contacting a first cell with a test compound and a semaphorin or semaphorin receptor, in the presence of a dye;
(2) measuring the net rate of influx of dye into the first cell; (3) observing the net rate of influx of dye into a control cell, in the absence of test compound comprising a semaphorin or semaphorin receptor, under otherwise identical conditions; and (4) comparing the net rate influx of dye into the first cell to the net rate of influx of dye into the control cell. Upon comparison, a difference in the net rate of influx of dye into the first cell relative to the control cell indicates that the test compound is an effector of cellular efflux.
In this manner, the effector can be identified as a substance that either promotes cellular efflux or inhibits cellular efflux and then can be used therapeutically. Alternatively, the test compound may S itself be a semaphorin or semaphorin receptor or fragment or antagonist or agonist thereof.
Any dye may be used in the assays of the present invention. The dyes useful in such methods may be characterized by, for example, one or more of the following properties:
lipophilic, cationic, fluorescent, and radioactive. Alternatively or additionally, the dye used in such methods can be a slow dye, a fast dye, acridine orange, BODIPY ceramide, SNARF-dextran, FITC-transferrin or BODIPY-transferrin.
As with all compositions and methods of the present invention, the semaphorin or semaphorin receptor used in this method can be any known semaphorin or semaphorin receptor polypeptide or useful fragment thereof, such as a fragment comprising the sema domain or the active domain of a semaphorin or semaphorin receptor. Additionally or alternatively, the presently disclosed method can be performed with any known semaphorin or semaphorin receptor, or fragment thereof being the test compound, or with an antibody to VESPR as the test compound.
In yet another aspect, the present invention provides pharmaceutical compositions and methods for the regulation of cellular-efflux, or MDR phenotype, by using the agent identified by the assays described herein. In this aspect of the invention, the modulating agent is effective to either inhibit or activate cellular efflux or development of drug resistance in a target cell.
IV. DETAILED DESCRIPTION OF THE INVENTION
Contrary to the results of Yamada et al., who postulate that semaphorins function analogously to growth factors and may be involved in non-MDR drug resistance, the present invention teaches that semaphorins and semaphorin receptors can be used to influence the function of cellular efflux pumps in a variety of ways, including activation, inhibition, and promotion of stasis of the pumps and can be used to regulate MDR. The invention also teaches that, depending upon the specific semaphorin/receptor interaction, this influence can be inhibitory, and the capacity of a cell to eliminate cellular contents can be reduced, or the influence can be to promote cellular efflux and thereby facilitate expulsion of cellular contents. Accordingly, depending upon the effect, the disclosed semaphorin and semaphorin receptor compositions and methods are also useful:
(1) to increase vulnerability or sensitivity of a cell to cytotoxic agents and thereby promote drug-induced cell death;
(2) in identification or design of semaphorin or semaphorin receptor antagonists or agonists that might increase the sensitivity of a cell to a cytotoxic agent; (3) to promote cellular resistance to cytotoxic agents; or (4) in identification of semaphorin or semaphorin receptor agonists or antagonists that can be administered to cells to promote their resistance to various cytotoxic substances.
A. SEMAPHORIN AND SEMAPHORIN RECEPTOR POLYPEPTIDES
The terms "semaphorin" and "semaphorin polypeptide" are used interchangeably in the present invention. Semaphorins include proteins of the Semaphorin family and are either secreted or membrane-bound. Semaphorins have a well-conserved extracellular semaphorin (sema) domain.
Generally, the sema domain is approximately 500 residues, but viral semaphorins themselves are only approximately 440 to 441 amino acids in length. It has been hypothesized that a 70 amino acid region with the sema domain is the active domain for semaphorin influence on certain cellular activities. See Koppel, et al. (1997). However it is not clear that this same region is the active site for all semaphorin activity. Accordingly, the present invention specifically contemplates the use of full-length semaphorin polypeptides, variants of these, and useful fragments of semaphorin polypeptides.
Specific semaphorins and semaphorin fragments that are useful according to the present invention include, for example, the following semaphorins: AHV Sema; A39R; Sema I, including G-sema I and D-sema-I; Sema II; Sema III; Sema IV; DC Sema; CD100; Z SMF-7; Sema A; Sema B;
Sema C;
Sema D; Sema E; Sema H; Sema L; Sema W and Sema Y. Additionally, useful fragments of any 1 S semaphorin, such as the sema domain or the active domain may also be used according to the present invention. For additional semaphorins that can be used in the presently disclosed compositions and methods, see Bamberg, et.al. Cell, 97:551 and United States Patent No.
5,935,865 to Goodman et al.
Nucleic acid sequences encoding the semaphorins or semaphorin fragments of the present invention, are also specifically contemplated to be useful in the disclosed compositions and methods.
"Semaphorin receptors" or "semaphorin receptor polypeptides" of the present invention are members of the Plexin family of semaphorin receptors. Plexins are membrane-bound polypeptides.
Plexins contain a "sema" domain that is related to the sema domain of semaphorins themselves, part of which constitutes a series of two or three cystein repeat sequences in the extracellular domain of plexins. Plexins are distinct from semaphorins, however, in a variety of respects. For example, in their intracellular domain, plexins are strongly homologous throughout the family of plexins, and contain well-conserved amino acid motifs that are not found in semaphorins.
Semaphorin receptors of the present invention are those plexin polypeptide sequences that can interact with a semaphorin or a semaphorin fragment, to influence cellular efflux or development of MDR phenotype in a cell Exemplary semaphorin receptor polypeptides include full-length plexin receptor polypeptides as well as homologues or fragments, such as the soluble extra cellular domain or the sema domain of such plexin receptor polypeptides. Preferred semaphorin receptor polypeptides include the Viral Encoded Semaphorin Receptor (VESPR) or fragments thereof. As used herein, the term VESPR or VESPR polypeptide refers to any polypeptide functioning as a receptor for viral semaphorins, for human homologues to viral semaphorins, or for human semaphorins.
Additionally, useful soluble forms of the VESPR polypeptide include those segments of the polypeptide comprising a portion of the extracellular domain of the receptor.
An example of a soluble VESPR polypeptide includes amino acids 1-944 of SEQ ID N0:2. In addition, truncated soluble VESPR proteins comprising less that the entire extracellular domain are included in the invention, e.g., S amino acids 35-944. Also encompassed within the present invention are the nucleic acid sequences encoding such useful VESPR polypeptides and polypeptide fragments. An exemplary Plexin receptor is the Viral Encoded Semaphorin Protein Receptor "VESPR," (described in copending patent application serial number 08/958,598). Specifically the amino acid sequence of SEQ ID N0:2 is useful as a semaphorin receptor polypeptide in the presently disclosed compositions and methods, as are the homologues and variants of polypeptides of SEQ ID N0:2. Nucleic acid sequences encoding the semaphorin receptors or receptor fragments are also within the scope of the presently disclosed compositions and methods. Particularly preferred nucleic acid sequences include the polynucleotide sequence of SEQ ID NO:I; and those segments of SEQ ID NO:1 that encode the soluble fragments of VESPR outlined above.
The semaphorin or semaphorin receptor polypeptides of the invention may be membrane bound or they may be secreted and thus soluble. Soluble polypeptides are capable of being secreted from the cells in which they are expressed. In general, soluble polypeptides may be identified (and distinguished from non-soluble membrane-bound counterparts) by separating intact cells which express the desired polypeptide from the culture medium, e.g., by centrifugation, and assaying the medium (supernatant) for the presence of the desired polypeptide. The presence of polypeptide in the medium indicates that the polypeptide was secreted from the cells and thus is a soluble form of the protein.
In one embodiment, the soluble polypeptides and fragments thereof comprise all or part of the extracellular domain, but lack the transmembrane region that would cause retention of the polypeptide on a cell membrane. A soluble polypeptide may include the cytoplasmic domain, or a portion thereof, as long as the polypeptide is secreted from the cell in which it is produced.
In general, the use of soluble forms is advantageous for certain applications.
Purification of the polypeptides from recombinant host cells is facilitated, since the soluble polypeptides are secreted from the cells. Further, soluble polypeptides are generally more suitable for intravenous administration.
The invention also provides polypeptides and fragments of the extracellular domain that retain a desired biological activity. Particular embodiments are directed to polypeptide fragments that retain the ability to interact with the semaphorin receptor or ligand to influence cellular efflux or the MDR
phenotype of a cell. Such a fragment may be a soluble polypeptide, as described above. In another embodiment, the polypeptides and fragments advantageously include regions that are conserved in the semaphorin family, in the case of semaphorins; or regions that are conserved in the plexin family in the case of the semaphorin receptors; or include the sema domain of either.
Also provided herein are polypeptide fragments comprising at least 20, or at least 30, contiguous amino acids of the sequence of SEQ ID N0:2. Fragments derived from the cytoplasmic domain fmd use in studies of signal transduction, and in regulating cellular processes associated with transduction of biological signals. Polypeptide fragments also may be employed as immunogens, in generating antibodies.
Naturally occurring variants as well as derived variants of the polypeptides and fragments are provided herein. Variants may exhibit amino acid sequences that are at least 80% identical. Also contemplated are embodiments in which a polypeptide or fragment comprises an amino acid sequence that is at least 90% identical, at least 95% identical, at least 98%
identical, at least 99% identical, or at least 99.9% identical to the preferred polypeptide or fragment thereof.
Percent identity can be determined by visual inspection and mathematical calculation. Alternatively, the percent identity of two protein sequences can be determined by comparing sequence information using the GAP computer program, based on the algorithm of Needleman and Wunsch (J. Mol. Bio. 48:443, 1970) and available from the University of Wisconsin Genetics Computer Group (UWGCG). The preferred default parameters for the GAP program include: (1) a scoring matrix, blosum62, as described by Henikoff and Henikoff (Proc. Natl. Acad. Sci. USA 89:10915, 1992); (2) a gap weight of 12; (3) a gap length weight of 4; and (4) no penalty for end gaps. Other programs used by one skilled in the art of sequence comparison may also be used.
The variants of the invention include, for example, those that result from alternate mRNA
splicing events or from proteolytic cleavage. Alternate splicing of mRNA may, for example, yield a truncated but biologically active protein, such as a naturally occurring soluble form of the protein.
Variations attributable to proteolysis include, for example, differences in the N- or C-termini upon expression in different types of host cells, due to proteolytic removal of one or more terminal amino acids from the protein (generally from 1-5 terminal amino acids). Proteins in which differences in amino acid sequence are attributable to genetic polymorphism (allelic variation among individuals producing the protein) are also contemplated herein.
Additional variants within the scope of the invention include polypeptides that may be modified to create derivatives thereof by forming covalent or aggregative conjugates with other chemical moieties, such as glycosyl groups, lipids, phosphate, acetyl groups and the like. Covalent derivatives may be prepared by linking the chemical moieties to functional groups on amino acid side chains or at the N-terminus or C-terminus of a polypeptide. Conjugates comprising diagnostic (detectable) or therapeutic agents attached thereto are contemplated herein, as discussed in more detail below.
Other derivatives include covalent or aggregative conjugates of the polypeptides with other proteins or polypeptides, such as by synthesis in recombinant culture as N-terminal or C-terminal fusions. Examples of fusion proteins are discussed below in connection with oligomers. Further, fusion proteins can comprise peptides added to facilitate purification and identification. Such peptides S include, for example, poly-His or the antigenic identification peptides described in U.S. Patent No.
5,011,912 and in Hopp et al., BiolTechnology 6:1204, 1988. One such peptide is the FLAG~ peptide, Asp-Tyr-Lys-Asp-Asp-Asp-Asp-Lys, which is highly antigenic and provides an epitope reversibly bound by a specific monoclonal antibody, enabling rapid assay and facile purification of expressed recombinant protein. A murine hybridoma designated 4E11 produces a monoclonal antibody that binds the FLAG~ peptide in the presence of certain divalent metal canons, as described in U.S. Patent 5,011,912, hereby incorporated by reference. The 4E11 hybridoma cell line has been deposited with the American Type Culture Collection under accession no. HB 9259. Monoclonal antibodies that bind the FLAG~ peptide are available from Eastman Kodak Co., Scientific Imaging Systems Division, New Haven, Connecticut.
Among the variant polypeptides provided herein are variants of native polypeptides that retain the native biological activity or the substantial equivalent thereof. One example is a variant that binds with essentially the same binding affinity as does the native form. Binding affinity can be measured by conventional procedures, e.g., as described in U.S. Patent No. 5,512,457 and as set forth below.
Variants include polypeptides that are substantially homologous to the native form, but which have an amino acid sequence different from that of the native form because of one or more deletions, insertions or substitutions. Particular embodiments include, but are not limited to, polypeptides that comprise from one to ten deletions, insertions or substitutions of amino acid residues, when compared to a native sequence.
A given amino acid may be replaced, for example, by a residue having similar physiochemical characteristics. Examples of such conservative substitutions include substitution of one aliphatic residue for another, such as Ile, Val, Leu, or Ala for one.another;
substitutions of one polar residue for another, such as between Lys and Arg, Glu and Asp, or Gln and Asn; or substitutions of one aromatic residue for another, such as Phe, Trp, or Tyr for one another. Other conservative substitutions, e.g., involving substitutions of entire regions having similar hydrophobicity characteristics, are well known.
Similarly, the DNAs of the invention include variants that differ from a native DNA sequence because of one or more deletions, insertions or substitutions, but that encode a biologically active polypeptide.
The invention further includes polypeptides of the invention with or without associated native-pattern glycosylation. Polypeptides expressed in yeast or mammalian expression systems (e.g., COS-1 or COS-7 cells) can be similar to or significantly different from a native polypeptide in molecular weight and glycosylation pattern, depending upon the choice of expression system. Expression of polypeptides of the invention in bacterial expression systems, such as E.
coli, provides non-glycosylated molecules. Further, a given preparation may include multiple differentially glycosylated species of the protein. Glycosyl groups can be removed through conventional methods, in particular those utilizing glycopeptidase. In general, glycosylated polypeptides of the invention can be incubated with a molar excess of glycopeptidase (Boehringer Mannheim).
Correspondingly, similar DNA constructs that encode various additions or substitutions of amino acid residues or sequences, or deletions of terminal or internal residues or sequences are encompassed by the invention. For example, N-glycosylation sites in the polypeptide extracellular domain can be modified to preclude glycosylation, allowing expression of a reduced carbohydrate analog in mammalian and yeast expression systems. N-glycosylation sites in eukaryotic polypeptides are characterized by an amino acid triplet Asn-X-Y, wherein X is any amino acid except Pro and Y is Ser or T'hr. Appropriate substitutions, additions, or deletions to the nucleotide sequence encoding these triplets will result in prevention of attachment of carbohydrate residues at the Asn side chain.
Alteration of a single nucleotide, chosen so that Asn is replaced by a different amino acid, for example, is sufficient to inactivate an N-glycosylation site. Alternatively, the Ser or Thr can by replaced with another amino acid, such as Ala. Known procedures for inactivating N-glycosylation sites in proteins include those described in U.S. Patent 5,071,972 and EP
276,846, hereby incorporated by reference.
In another example of variants, sequences encoding Cys residues that are not essential for biological activity can be altered to cause the Cys residues to be deleted or replaced with other amino acids, preventing formation of incorrect intramolecular disulfide bridges upon folding or renaturation.
Other variants are prepared by modification of adjacent dibasic amino acid residues, to enhance expression in yeast systems in which KEX2 protease activity is present. EP 212,914 discloses the use of site-specific mutagenesis to inactivate KEX2 protease processing sites in a protein. KEX2 protease processing sites are inactivated by deleting, adding or substituting residues to alter Arg-Arg, Arg-Lys, and Lys-Arg pairs to eliminate the occurrence of these adjacent basic residues. Lys-Lys pairings are considerably less susceptible to KEX2 cleavage, and conversion of Arg-Lys or Lys-Arg to Lys-Lys represents a conservative and preferred approach to inactivating KEX2 sites.
Encompassed by the invention are oligomers or fusion proteins that contain semaphorin or semaphorin receptor polypeptides. Such oligomers may be in the form of covalently-linked or non-covalently-linked multimers, including dimers, trimers, or higher oligomers.
As noted above, preferred polypeptides are soluble and thus these oligomers may comprise soluble polypeptides. In one aspect of the invention, the oligomers maintain the binding ability of the polypeptide components and provide therefor, bivalent, trivalent, etc., binding sites.
One embodiment of the invention is directed to oligomers comprising multiple polypeptides joined via covalent or non-covalent interactions between peptide moieties fused to the polypeptides.
Such peptides may be peptide linkers (spacers), or peptides that have the property of promoting oligomerization. Leucine zippers and certain polypeptides derived from antibodies are among the peptides that can promote oligomerization of the polypeptides attached thereto, as described in more detail below.
As one alternative, an oligomer is prepared using polypeptides derived from immunoglobulins.
Preparation of fusion proteins comprising certain heterologous polypeptides fused to various portions of antibody-derived polypeptides (including the Fc domain) has been described, e.g., by Ashkenazi et al. (PNAS USA 88:10535, 1991); Byrn et al. (Nature 344:677, 1990); and Hollenbaugh and Aruffo ("Construction of Immunoglobulin Fusion Proteins", in Current Protocols in Immunology, Suppl. 4, pages 10.19.1 - 10.19.11, 1992).
One embodiment of the present invention is directed to a dimer comprising two fusion proteins created by fusing a polypeptide of the invention to an Fc polypeptide derived from an antibody. A gene fusion encoding the polypeptide/Fc fusion protein is inserted into an appropriate expression vector. Polypeptide/Fc fusion proteins are expressed in host cells transformed with the recombinant expression vector, and allowed to assemble much like antibody molecules, whereupon interchain disulfide bonds form between the Fc moieties to yield divalent molecules.
The term "Fc polypeptide" as used herein includes native and mutein forms of polypeptides made up of the Fc region of an antibody comprising any or all of the CH
domains of the Fc region.
Truncated forms of such polypeptides containing the hinge region that promotes dimerization are also included. Preferred polypeptides comprise an Fc polypeptide derived from a human IgGI antibody.
One suitable Fc polypeptide, described in PCT application WO 93/10151 (hereby incorporated by reference), is a single chain polypeptide extending from the N-terminal hinge region to the native C-terminus of the Fc region of a human IgGI antibody. Another useful Fc polypeptide is the Fc mutein described in U.S. Patent 5,457,035 and in Baum et al., (EMBO J. 13:3992-4001, 1994) incorporated herein by reference. The amino acid sequence of this mutein is identical to that of the native Fc sequence presented in WO 93/10151, except that amino acid 19 has been changed from Leu to Ala, amino acid 20 has been changed from Leu to Glu, and amino acid 22 has been changed from Gly to Ala. The mutein exhibits reduced affinity for Fc receptors.
The above-described fusion proteins comprising Fc moieties (and oligomers formed therefrom) offer the advantage of facile purification by affinity chromatography over Protein A or Protein G columns.
In other embodiments, the polypeptides of the invention may be substituted for the variable portion of an antibody heavy or light chain. If fusion proteins are made with both heavy and light chains of an antibody, it is possible to form an oligomer with as many as four semaphorin or semaphorin receptor extracellular regions.
Alternatively, the oligomer is a fusion protein comprising multiple polypeptides, with or without peptide linkers (spacer peptides). Among the suitable peptide linkers are those described in U.S. Patents 4,751,180 and 4,935,233, which are hereby incorporated by reference. A DNA sequence encoding a desired peptide linker may be inserted between, and in the same reading frame as, the DNA
sequences of the invention, using any suitable conventional technique. For example, a chemically synthesized oligonucleotide encoding the linker may be ligated between the sequences. In particular embodiments, a fusion protein comprises from two to four soluble semaphorin or semaphorin receptor polypeptides, separated by peptide linkers.
Another method for preparing the oligomers of the invention involves use of a leucine zipper.
Leucine zipper domains are peptides that promote oligomerization of the proteins in which they are found. Leucine zippers were originally identified in several DNA-binding proteins (Landschulz et al., Science 240:1759, 1988), and have since been found in a variety of different proteins. Among the known leucine zippers are naturally occurring peptides and derivatives thereof that dimerize or trimerize. Zipper domains (also referred to herein as an oligomerizing, or oligomer-forming, domain) and their use are well-known in the art.
B. ASSAYS
The influence of semaphorins on cellular efflux may be used to control the development of MDR phenotypes of a cell or group of cells. For example, semaphorin polypeptides, or polynucleotides encoding semaphorin polypeptides may be administered to a cell or group of cells to stimulate or inhibit cellular efflux, to either induce, enhance, suppress or arrest the development of multiple drug resistance in the target cells. Identification of semaphorin-containing compositions that may be used in this manner may be carried out via a variety of assays known to those skilled in the art.
Included in such assays are those that evaluate the ability of a semaphorin composition to influence cell survival rates in the presence of cytotoxic agents. Such an assay would involve, for example, the determination of sensitivities of tumor cells or cell lines to anticancer drugs in the presence and absence of a semaphorin. In these assays, one would determine a rate of cell death in the presence of the cytotoxic agent (such as doxorubicin, etc.) and then determine if the rate of cell death resulting from that agent is altered in the presence of a semaphorin.
Alternatively, one might monitor MDR protein-like activity in a cell by examining the ability of primary cells, or cells overexpressing MDR proteins, to efflux dyes in the presence and absence of a semaphorin. These types of assays are routine, and employ what are referred to as either "slow" or "fast" cellular dyes, that is, dyes that are typically lipophilic, or cationic. (see, e.g., Lelong, et al., 1991). One example of use of these dyes involves loading the dye into a cell at low temperatures, such as 4 degrees (or on ice), and then examining the stained cells by flow cytometry. The cells will fluoresce depending on how much dye they take up; and, if loaded in the presence of an MDR efflux pump inhibitor such as verapamil or cyclosporin, or a semaphorin of the present invention, they may fluoresce more brightly than cells loaded in the absence of an MDR inhibitor.
In this manner S inhibitors of cellular efflux pumps can be identified. This assay may then also be taken a step further by transferring the cells loaded with dye to elevated temperature conditions, such as 37 degrees Centigrade, for a period of time, such as approximately three hours, at which time the cells are again examined on the flow cytometer, and compared to cells that were loaded with dye and held at cooler temperatures, such as the previously noted 4 degrees. At higher temperatures, cellular efflux pumps, including the MDR proteins, are quite active and can extrude the dye from the cell at a rapid rate. The ability of a semaphorin to influence this efflux can be measured by including the semaphorin in the assay during the efflux phase.
Yet another assay that may be used in the present invention involves examining intracellular pH, and the pH of intracellular compartments, in response to semaphorins.
These types of assays again use fluorescent probes that target to the cytoplasm or to specific organelles, and exhibit fluorescence pattern changes as the pH changes. See, e.g. Altan, N et al. J.
Exp. Med. 187:1583, Altan, N et al. PNAS 96:4432, Chen, Y et al. JBC 274:18364, Schindler, M. et al. Biochemistry 35:2811.. Dyes that are useful in such assays include dyes such as acridine orange (which targets acidic compartments and whose fluorescent wavelength and intensity depends on the pH of that organelle), BODIPY-ceramide (which targets the trans-golgi network), SNARF-dextrans of varying molecular weights (allowing one to target cytosol or nucleus), and FITC-transferrin or BODIPY-transferrin (which targets endocytic vesicles). These dyes are used to stain cells and then their fluorescence intensity and/or pattern is measured on a confocal microscope.
Another embodiment of the present invention provides a method of detecting the ability of the test compound to influence the MDR phenotype of a cell. In this aspect of the invention, the method includes contacting a first cell with a test compound including a semaphorin or semaphorin receptor in the presence of a cytotoxic agent. The method then involves measuring the rate of death of that first cell. Then the rate of death of a controlled cell is observed, with the control cell under similar conditions but in the absence of a test compound comprising a semaphorin or semaphorin receptor, and in the presence of a cytotoxic agent, which is the same agent administered to the first cell. The death rate of the first cell is then compared to the death rate of the control cell and the difference in the rate of cell death between the first cell and the control cell is indicative of an agent that influences development of multiple drug resistance phenotype. This agent may be one that functions to increase multiple drug resistance in the cell or to decrease multiple drug resistance in the cell.
In addition to those semaphorins listed in Section III above, specific semaphorins that may be tested according to this embodiment of the invention include A39R, DCSema, CD100, Sema III, Sema E, or active fragments of these semaphorins. Specific exemplary useful semaphorin receptors that may be used in these assays include VESPR. Alternatively, an agonist or antagonist to a semaphorin or semaphorin receptor may used according to this aspect of the invention. In a particularly preferred embodiment, an antibody to VESPR is used. Examples of cytotoxic agents that may be used in this method of detection include doxorubicin, radiation, tamoxifen, or any other compound known to have a cytotoxic effect on a cell.
In another aspect, the present invention provides a method of detecting the ability of a test compound to influence the MDR phenotype of a cell by modulating the cellular efflux of that cell. In this aspect, one example of such a method includes: (1) contacting a first cell with a test compound including a semaphorin or semaphorin receptor in the presence of a dye; (2) measuring the net rate of influx of dye into this first cell; and (3) observing the net rate of influx of dye into a control cell under similar conditions, but in the absence of a test compound comprising a semaphorin or semaphorin receptor. In this embodiment, the net rate of influx of dye is the rate of influx of dye relative to the rate of efflux, as measured by the amount of dye detected in the cell. The comparison will provide a difference in the net rate of influx of the dye such that influx of the dye into the first cell relative to the control cell is indicative of an agent that can influence cellular efflux. The test compound may function to either activate or up-regulate, or inhibit or down-regulate cellular efflux, either of which function may be detected through this method.
In addition to the semaphorins listed in Section III above, specific semaphorins that may be tested according to this embodiment of the invention include A39R, DCSema, CD100, Sema III, Sema E, or active fragments of these semaphorins. Specific exemplary useful semaphorin receptors that may be used in these assays include VESPR. Alternatively, an agonist or antagonist to a semaphorin or semaphorin receptor may used according to this aspect of the invention. In a particularly preferred embodiment, an antibody to VESPR is used.
Virtually any dye may be used in this method. Exemplary dyes include those which are characterized by one or more of the following properties: lipophilic, cationic, fluorescent, and radioactive. Specific exemplary dyes include a slow dye; a fast dye; acridine orange; various BODIPY
dyes including specific ones such as 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene-3,5-dipropionic acid, BODIPY ceramide, and BODIPY-transferrin; seminaphthorhodafluors ("SNARF") -dextran; and Fluorescien isothiocyanate ("FITC")-transferrin.
C. COMPOUNDS AND METHODS FOR THE MODULATION OF CELLULAR EFFLUX
Described below are methods and compositions employing semaphorins, semaphorin receptors, fragments of these, or the genes encoding them, for use in the promotion or suppression of cellular efflux or for controlling development of MDR in a target cell or group of cells. It is specifically contemplated that such compositions and methods can be used to treat a cell or group of cells both in vivo and in vitro.
For example, such methods can comprise administering compounds which modulate cellular efflux, and thereby influence development of MDR phenotype or cellular efflux-related disease states.
Administration of such compounds can be used to inhibit drug resistance thereby sensitizing cells to cytotoxic substances; to promote resistance to cytotoxic substances and protect against cytotoxic substances; or to the dysregulation of cellular efflux in cells that are unable to otherwise regulate themselves, such as those cells associated with diseases such as cystic fibrosis.
In addition to methods utilizing semaphorin or semaphorin receptor-encoding nucleic acid sequences, it is also useful to modulate cellular efflux by using the semaphorin or semaphorin receptor polypeptide, or polypeptide fragments. Another means of modulating cellular efflux or MDR
phenotypes according to the present invention involves the use of any of the compounds identified through the assays set forth in Section B above.
1 S When the actual nucleic acid sequences encoding the semaphorins;
semaphorin receptors; or fragments of either that are disclosed in the present invention are delivered according to the methods described herein, it is advantageous to use a delivery mechanism so that the sequences will be incorporated into a cell for expression. Delivery systems that may advantageously be employed in the contemplated methods include the use of, for example, viral delivery systems such as retroviral and adenoviral vectors, as well as non-viral delivery systems. Such delivery systems are well known by those skilled in the art.
In one aspect of the invention, a retroviral delivery system may be employed.
The retroviruses are a group of single-stranded RNA viruses characterized by an ability to convert their RNA to double-stranded DNA in infected cells by a process of reverse-transcription (Coffin, 1990). The resulting DNA then stably integrates into cellular chromosomes as a provirus and directs synthesis of viral proteins.
The integration results in the retention of the viral gene sequences in the recipient cell and its descendants.
The retroviral genome contains three genes - gag, pol, and env - that code for capsid proteins, polymerise enzyme, and envelope components, respectively. A sequence found upstream from the gag gene, termed y~, functions as a signal for packaging of the genome into virions. Two long terminal repeat (LTR) sequences are present at the 5' and 3' ends of the viral genome. These contain strong promoter and enhancer sequences and are also required for integration in the host cell genome (Coffin, 1990).
1n order to construct a retroviral vector, a nucleic acid encoding a Crrb2 or Crkl antisense construct is inserted into the viral genome in the place of certain viral sequences to produce a virus that is replication-defective. In order to produce virions, a packaging cell line containing the gag, pol and env genes but without the LTR and y~ components is constructed (Mann et al., 1983). When a recombinant plasmid containing an inserted DNA, together with the retroviral LTR and yr sequences, is introduced into this cell line (by calcium phosphate precipitation for example), the y sequence allows the RNA transcript of the recombinant plasmid to be packaged into viral particles, which are then secreted into the culture media (Nicolas and Rubenstein, 1988; Temin, 1986; Mann et al., 1983). The media containing the recombinant retroviruses is then collected, optionally concentrated, and used for gene transfer. Retroviral vectors are able to infect a broad variety of cell types. However, integration and stable expression require the division of host cells (Paskind et al., 1975).
Alternatively, an adenoviral delivery system may be employed. Human adenoviruses are double-stranded DNA tumor viruses with genome sizes of approximate 36 kB
(Tooze, 1981). As a model system for eukaryotic gene expression, adenoviruses have been widely studied and well characterized, which makes them an attractive system for development of adenovirus as a gene transfer system. This group of viruses is easy to grow and manipulate, and they exhibit a broad host range in vitro and in vivo.
In lytically infected cells, adenoviruses are capable of shutting off host protein synthesis, directing cellular machineries to synthesize large quantities of viral proteins, and producing copious amounts of virus.
The El region of the genome includes ElA and E1B which encode proteins responsible for transcription regulation of the viral genome, as well as a few cellular genes.
E2 expression, including E2A and E2B, allows synthesis of viral replicative functions, e.g. DNA-binding protein, DNA
polymerase, and a terminal protein that primes replication. E3 gene products prevent cytolysis by cytotoxic T cells and tumor necrosis factor and appear to be important for viral propagation. Functions associated with the E4 proteins include DNA replication, late gene expression, and host cell shutoff. The late gene products include most of the virion capsid proteins, and these are expressed only after most of the processing of a single primary transcript from the major late promoter has occurred. The major late promoter (MLP) exhibits high efficiency during the late phase of the infection (Stratford-Perricaudet and Perricaudet, 1991 ).
As only a small portion of the viral genome appears to be required in cis (Tooze, 1981), adenovirus-derived vectors offer excellent potential for the substitution of large DNA fragments when used in connection with cell lines such as 293 cells. Ad5-transformed human embryonic kidney cell lines (Graham, et al., 1977) have been developed to provide the essential viral proteins in traps.
Particular advantages of an adenovirus system for delivering foreign proteins to a cell include (i) the ability to substitute relatively large pieces of viral DNA by foreign DNA;
(ii) the structural stability of recombinant adenoviruses; (iii) the safety of adenoviral administration to humans; and (iv) lack of any known association of adenoviral infection with cancer or malignancies; (v) the ability to obtain high titers of the recombinant virus; and (vi) the high infectivity of adenovirus.
Further advantages of adenovirus vectors over retroviruses include the higher levels of gene 3 S expression. Additionally, adenovirus replication is independent of host gene replication, unlike retroviral sequences. Because adenovirus transforming genes in the E1 region can be readily deleted and still provide efficient expression vectors, oncogenic risk from adenovirus vectors is thought to be negligible (Gnmhaus & Horwitz, 1992).
In general, adenovirus gene transfer systems are based upon recombinant, engineered adenovirus which is rendered replication-incompetent by deletion of a portion of its genome, such as E1, and yet still retains its competency for infection. Sequences encoding relatively large foreign proteins can be expressed when additional deletions are made in the adenovirus genome. For example, adenoviruses deleted in both E1 and E3 regions are capable of carrying up to 10 kB of foreign DNA and can be grown to high titers in 293 cells (Stratford-Perncaudet and Perricaudet, 1991).
Surprisingly persistent expression of transgenes following adenoviral infection has also been reported.
Other viral vectors may be employed as expression constructs in the present invention. Vectors derived from viruses such as vaccinia virus (Ridgeway, 1988; Baichwal and Sugden, 1986; Coupar et al., 1988) adeno-associated virus (AAV) (Ridgeway, 1988; Baichwal and Sugden, 1986;
Hermonat and Muzycska, 1984) and herpesviruses may be employed. They offer several attractive features for various mammalian cells (Friedmann, 1989; Ridgeway, 1988; Baichwal and Sugden, 1986;
Coupar et al., 1988;
Norwich et al., 1990).
With the recent recognition of defective hepatitis B viruses, new insight was gained into the structure-function relationship of different viral sequences. In vitro studies showed that the virus could retain the ability for helper-dependent packaging and reverse transcription despite the deletion of up to 80% of its genome (Norwich et al., 1990). This suggested that large portions of the genome could be replaced with foreign genetic material. The hepatotropism and persistence (integration) were particularly attractive properties for liver-directed gene transfer. Chang et al. recently introduced the chloramphenicol acetyltransferase (CAT) gene into duck hepatitis B virus genome in the place of the polymerase, surface, and pre-surface coding sequences. It was cotransfected with wild-type virus into an avian hepatoma cell line. Culture media containing high titers of the recombinant virus were used to infect primary duckling hepatocytes. Stable CAT gene expression was detected for at least 24 days after h-ansfection (Chang et al., 1991).
In yet another aspect, non-viral vectors may be used according to the presently disclosed methods.
Several non-viral methods for the transfer of expression vectors into cultured mammalian cells also are contemplated by the present invention. These include calcium phosphate precipitation (Graham and Van Der Eb, 1973; Chen and Okayama, 1987; Rippe et al., 1990) DEAE-dextran (Gopal, 1985), electroporation (Tur-Kaspa et al., 1986; Potter et al., 1984), direct microinjection (Harland and Weintraub, 1985); DNA-loaded liposomes (Nicolau and Sene, 1982; Fraley et al., 1979) and lipofectamine-DNA
complexes, cell sonication (Fechheimer et al., 1987), gene bombardment using high velocity microprojectiles (Yang et al., 1990), polycations (Boussif et al., 1995) and receptor-mediated transfection (Wu and Wu, 1987; Wu and Wu, 1988). Some of these techniques may be successfully adapted for in vivo or ex vivo use.
In one embodiment of the invention, the expression construct may simply consist of naked recombinant vector. Transfer of the construct may be performed by any of the methods mentioned above S which physically or chemically permeabilize the cell membrane. For example, Dubensky et al. ( 1984) successfully injected polyomavirus DNA in the form of CaP04 precipitates into liver and spleen of adult and newborn mice demonstrating active viral replication and acute infection.
Benvenisty and Neshif (1986) also demonstrated that direct intraperitoneal injection of CaP04 precipitated plasmids results in expression of the transfected genes. It is envisioned that DNA encoding an Grb2 or Crkl construct may also be transferred in a similar manner in vivo.
Another embodiment of the invention for transferring a naked DNA expression vector into cells may involve particle bombardment. This method depends on the ability to accelerate DNA coated microprojectiles to a high velocity allowing them to pierce cell membranes and enter cells without killing them (Klein et al., 1987). Several devices for accelerating small particles have been developed. One such 1 S device relies on a high voltage discharge to generate an electrical current, which in turn provides the motive force (Yang et al., 1990). The microprojectiles used have consisted of biologically inert substances such as tungsten or gold beads.
Selected organs including the liver, skin, and muscle tissue of rats and mice have been bombarded in vivo (Yang et al., 1990; Zelenin et al., 1991). This may require surgical exposure of the tissue or cells, to eliminate any intervening tissue between the gun and the target organ. DNA
encoding a Crrb2 or Crkl construct may be delivered via this method.
Alternatively, the degree of cellular efflux in a cell may be influenced by administering a compound identified via one of the assays described above, that increases or decreases the rate of cellular efflux or development of MDR phenotype.
2S D. FORMULATION AND ADMINISTRATION OF THE DISCLOSED COMPOSITIONS
The formulations described herein may be prepared in water suitably mixed with a surfactant, such as hydroxypropylcellulose or polyoxyethylenesorbitans. In many cases, it will be preferable to include isotonic agents, for example, sugars or sodium chloride as described above. Prolonged absorption of the injectable compositions can be brought about by the use in the compositions of agents delaying absorption, for example, aluminum monostearate or gelatin.
Other agents that may be employed include, but are not limited to lecithin, urea, ethylene oxide, propylene oxide, hydroxypropylcellulose, methylcellulose, or polyethylene glycol.
Aqueous compositions (inocula) as described herein may include an effective amount of a desired pharmacologically active agent dissolved or dispersed in a pharmaceutically acceptable 3S aqueous medium. Such compositions are also referred to as inocula. The use ofpharmaceutically acceptable carrier media and agents for pharmaceutically active substances is well known in the art.
Except insofar as any conventional media or agent is incompatible with the active ingredient, its use in the therapeutic compositions is contemplated. Supplementary active ingredients also can be incorporated into the compositions as described above.
A semaphorin used in the present invention may be formulated into a composition in a neutral or salt form. Pharmaceutically acceptable salts include the acid addition salts (formed with the free amino groups of the protein) and those that are formed with inorganic acids such as, for example, hydrochloric or phosphoric acids, or such organic acids as acetic, oxalic, tartaric, mandelic, and the like. Salts formed with the free carboxyl groups can also be derived from inorganic bases such as, for example, sodium, potassium, ammonium, calcium, or fernc hydroxides, and such organic bases as isopropylamine, trimethylamine, histidine, procaine and the like.
Such compositions of the present invention can be, alternatively, complexed with polyethylene glycol (PEG), metal ions, or incorporated into polymeric compounds such as polyacetic acid, polyglycolic acid, hydrogels, dextran, etc. or incorporated into liposomes, microemulsions, micelles, 1 S unilamellar or multilamellar vesicles, erythrocyte ghosts or sphereoblasts. Such compositions will influence the physical state, solubility, stability, rate of in vivo release, and rate of in vivo clearance, and are thus chosen according to the intended application.
The therapeutic compositions of the present invention are advantageously administered in the form of injectable compositions either as liquid solutions or suspensions;
solid forms suitable for solution in, or suspension in, liquid prior to injection may also be prepared.
Alternatively, the compositions of the present invention may be administered as inhalants in an aerosolized form.
Depending upon the needs of the formulator, administrator, or the subject of the treatment, the presently disclosed compositions may take virtually any form including liquid, suspension, aerosol, emulsion, solution, oil, mixture, cream, ointment, gel, suppository, semi-solid, aerosol, powder, lyophilized form that may be reconstituted when appropriate, tablet, capsule or any other form or state convenient for administration to treat the described disorders. A typical composition comprises a pharmaceutically acceptable carrier.
The presently disclosed compositions and methods may utilize both oral and non-oral administration routes to influence the target cell or cells including, for example, by injection via the intradermal, subcutaneous, and intravenous routes; by transdermal delivery; by inhalation or buccal delivery, or by ingestion of tablets or capsules. For example, local or regional delivery of compounds to a cell or cells can be by injection into the tissue, injection into the vasculature or lymphatics to effect regional infusion, inhalation, or regional perfusion by use of an extracorporeal circuit.
Administration in a targeted fashion is useful to, for example, more effectively eliminate neoplastic cells, while minimizing the adverse effects of chemotherapy on healthy cells.
For example, an inhibitor of cellular efflux can be directly administered, according to the methods disclosed herein, to neoplastic cells such as tumor cells, to prevent their development of MDR and thereby promote their susceptibility to chemotherapeutic or otherwise cytotoxic agents, while simultaneously administering to healthy cells a promoter of cellular-efflux to prevent their destruction by cytotoxic agents.
The optimal daily dose of semaphorin, semaphorin receptor such as VESPR or soluble VESPR, or of an agonist or antagonist of one of these, alone or in combination, useful for the purposes of the present invention is determined by methods known in the art. For example, dosages can be determined based on the severity of the disease or condition being treated, the condition of the subject to whom treatment is being given, the desired degree of therapeutic response, and any concomitant therapies being administered to the subject. Ordinarily, however, administration will be such that a serum level of between about 100ng/ml to about 1 OOpg/ml of semaphorin, semaphorin receptor, or agonist or antagonist of either, is achieved. Preferred doses will achieve blood serum levels of between SOOng/ml and 1 ug/ml. The dose can be administered in a single or multiple dosage regimen, or may be by a method that allows for a continuous release of relatively small amounts of the active ingredient from a single dosage unit, such as by a transdermal patch or ingested extended release capsule, over the course of one or more days.
To determine when inhibition or retardation of the various target diseases or conditions, or when amelioration, regression or destruction of the targeted diseases or conditions has been achieved, any of the following can be considered: improvement in patient condition or quality of life; increased longevity of life; decreased pain; decreased severity of symptoms of the targeted disease or condition;
retardation of abnormal tissue growth or metastases such as in the case of suppression of development of MDR in cells being targeted for cancer chemotherapeutic disease; an increase in desired tissue growth or viability in the case or promotion of drug resistance in healthy tissue and cells; and the like.
Any of these endpoints as well as others may be considered to determine the effectiveness of the therapy, and may be measured or determined by patient self evaluation;
objective screening; or by diagnostic testing such as by X-ray, CT or PET scanning or the like.
The compositions as described herein may be formulated so that they are contained in a vial, bottle, tube, syringe inhaler or other container for single or multiple administrations. Such containers may be made of glass or a polymer material such as polypropylene, polyethylene, or polyvinylchloride, for example. Preferred containers may include a seal, or other closure system, such as a rubber stopper that may be penetrated by a needle in order to withdraw a single dose and then re-seal upon removal of the needle. All such containers for injectable liquids, lyophilized formulations, reconstituted lyophilized formulations or reconstitutable powders for injection known in the art or for the administration of aerosolized compositions are contemplated for use in the presently disclosed compositions and methods.
In alternative embodiments, the presently disclosed compositions are administered in conjunction, either simultaneously or sequentially, with additional active agents such as an immunosuppressant, cell sensitizer, or other chemotherapeutic agent including a cancer chemotherapeutic agent. Exemplary agents to be used in combination with the presently disclosed compositions include cyclosporin, tamoxifen, FK506, taxotere, doxorubicin, cis-platin, I-phosphamide, or methotrexate.
REFERENCES
Altan, et al., J. Exp. Med. 187:1583 Altan, et al., PNAS 96:4432 Chen, et al., JBC 274:18364 Kim et al., Blood, 91:4106-4117 (1998) Lelong, et al., Molecular Pharmacology 40:490 (1991).
Schindler, et al., Biochemistry 35:2811 Weisburg et al, J. Biol Chem, 274, 10877-88 (1999) Yamada et.al., PNAS 94:14713-14718 (1997) Zaman, G.J.R. et.al., PNAS USA 91:8822 (1994) INFORMATION FOR SEQ ID NO:1:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 4707 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA
(iii) HYPOTHETICAL: NO
(iv) ANTI-SENSE: NO
(ix) FEATURE:
(A) NAME/KEY: CDS
(B) LOCATION: 1..4707 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:1:
Met Glu Val Ser Arg Arg Lys Ala Pro Pro Arg Pro Pro Arg Pro Ala Ala Pro Leu Pro Leu Leu Ala Tyr Leu Leu Ala Leu Ala Ala Pro Gly Arg Gly Ala Asp Glu Pro Val Trp Arg Ser Glu Gln Ala Ile Gly Ala Ile Ala Ala Ser Gln Glu Asp Gly Val Phe Val Ala Ser Gly Ser Cys Leu Asp Gln Leu Asp Tyr Ser Leu Glu His Ser Leu Ser Arg Leu Tyr Arg Asp Gln Ala Gly Asn Cys Thr Glu Pro Val Ser Leu Ala Pro Pro Ala Arg Pro Arg Pro Gly Ser Ser Phe Ser Lys Leu Leu Leu Pro Tyr Arg Glu Gly Ala Ala Gly Leu Gly Gly Leu Leu Leu Thr Gly Trp Thr Phe Asp Arg Gly Ala Cys Glu Val Arg Pro Leu Gly Asn Leu Ser Arg CAG GGC
Asn Ser Leu Arg Asn Gly Thr Glu Val Val Ser Cys His Pro Gln Gly TGG TAC
Ser Thr Ala Gly Val Val Tyr Arg Ala Gly Arg Asn Asn Arg Trp Tyr GCG AGC
Leu Ala Val Ala Ala Thr Tyr Val Leu Pro Glu Pro Glu Thr Ala Ser CTC AAG
Arg Cys Asn Pro Ala Ala Ser Asp His Asp Thr Ala Ile Ala Leu Lys CTC AAG
Asp Thr Glu Gly Arg Ser Leu Ala Thr Gln Glu Leu Gly Arg Leu Lys CTC TGG
Leu Cys Glu Gly Ala Gly Ser Leu His Phe Val Asp Ala Phe Leu Trp AGC GGC
Asn Gly Ser Ile Tyr Phe Pro Tyr Tyr Pro Tyr Asn Tyr Thr Ser Gly ACC GAG
Ala Ala Thr Gly Trp Pro Ser Met Ala Arg Ile Ala Gln Ser Thr Glu CAC CCC
Val Leu Phe Gln Gly Gln Ala Ser Leu Asp Cys Gly His Gly His Pro CTG GAC
Asp Gly Arg Arg Leu Leu Leu Ser Ser Ser Leu Val Glu Ala Leu Asp GAG CGG
Val Trp Ala Gly Val Phe Ser Ala Ala Ala Gly Glu Gly Gln Glu Arg GAG ATC
Arg Ser Pro Thr Thr Thr Ala Leu Cys Leu Phe Arg Met Ser Glu Ile GAG AGC
Gln Ala Arg Ala Lys Arg Val Ser Trp Asp Phe Lys Thr Ala Glu Ser GAA AGA
GTC
CAA
CCA
ATC
GCA
TCA
HisCys LysGluGly AspGlnPro GluArgVal GlnPro Ile Ser Ala GTG
SerThr LeuIleHis SerAspLeu ThrSerVal TyrGly Thr Val Val MetAsn ArgThrVal LeuPheLeu GlyThrGly AspGly GlnLeuLeu LysVal IleLeuGly GluAsnLeu ThrSerAsn CysPro GluValIle TyrGlu IleLysGlu GluThrPro ValPheTyr LysLeu ValProAsp ProVal LysAsnIle TyrIleTyr LeuThrAla GlyLys GluValArg ArgIle ArgValAla AsnCysAsn LysHisLys SerCys SerGluCys LeuThr AlaThrAsp ProHisCys GlyTrpCys HisSer LeuGlnArg CysThr PheGlnGly AspCysVal HisSerGlu AsnLeu GluAsnTrp LeuAsp IleSerSer GlyAlaLys LysCysPro LysIle GlnIleIle ArgSer SerLysGlu LysThrThr ValThrMet ValGly SerPheSer ProArg HisSerLys CysMetVal LysAsnVal AspSer SerArgGlu LeuCys GlnAsnLys SerGlnPro AsnArgThr CysThr CysSerIle ProThr ArgAlaThr TyrLysAsp ValSerVal ValAsn ValMetPhe TTC
GGT
TCT
TGG
AAT
TTA
TCA
GAC
AGA
TTC
AAC
TTT
ACC
AAC
TGC
Ser Ser Asp Arg Asn Cys Phe Trp Phe Asn Gly Asn Phe Thr Leu Ser TCA GCA GAA ACT
TTA GGC TGC
AAA
GAA
TGC
Ser Leu LysGlu Pro Cys Val Ala Trp Ser Cys Ala Glu Thr Gly Cys AAA AGG ATC TTC TGC
Cys LysSer AlaArg Cys His Pro Thr Ala Asp Pro Arg Ile Phe Cys AAC GAA CCA GTC
Ser AspTyr GluArg Gln Gln Cys Val Ala Glu Lys Asn Glu Pro Val AGA AAG AAG AGA
Thr SerGly GlyGly Pro Glu Asn Gly Asn Thr Asn Arg Lys Lys Arg TTC ATT ATT CAG
Gln AlaLeu GlnVal Tyr Lys Ser Glu Pro Lys Val Phe Ile Ile Gln AGC GTG ACG AAC
Ser ThrLeu GlyLys Asn Ile Val Gly Ala Phe Thr Ser Val Thr Asn ACA ATC GGA ACC
Arg AlaSer AsnIle Met Leu Lys Thr Ser Cys Asp Thr Ile Gly Thr GTT CAT AAT CAC
Lys AspVal IleGln Ser Val Leu Asp Thr Met Lys Val His Asn His AGC AAA AAG TGT
Phe SerLeu ProSer Arg Glu Met Asp Val Ile Gln Ser Lys Lys Cys TGC TCT TCC TAC
Phe AspGly GlyAsn Ser Val Gly Leu Ser Ile Ala Cys Ser Ser Tyr 740 745 75p CTT TTT ACC ATC AGT
GGT
Leu ProHis CysSer Ile Pro Ala Thr Trp Ser Gly Leu Phe Thr Ile AAT ATG GGC ATT GAC
ATA AGA AAC
AAT
TTT
Gly GlnAsn IleThr Met Asp Val Met Gly Ile Asp Arg Asn Asn Phe ATT GAA
TCA TTA
AAA
GGA
AAC
ATA
AAT
GTC
TCT
GAA
TAT
Leu IleIle Leu Ser Lys His Gly Glu Asn Ile Asn Val Ser Glu Tyr Cys Val Ala Thr Tyr Cys Gly Phe Leu Ala Pro Ser Leu Lys Ser Ser Lys Val Arg Thr Asn Val Thr Val Lys Leu Arg Val Gln Asp Thr Tyr Leu Asp Cys Gly Thr Leu Gln Tyr Arg Glu Asp Pro Arg Phe Thr Gly Tyr Arg Val Glu Ser Glu Val Asp Thr Glu Leu Glu Val Lys Ile Gln Lys Glu Asn Asp Asn Phe Asn Ile Ser Lys Lys Asp Ile Glu Ile Thr Leu Phe His Gly Glu Asn Gly Gln Leu Asn Cys Ser Phe Glu Asn Ile Thr Arg Asn Gln Asp Leu Thr Thr Ile Leu Cys Lys Ile Lys Gly Ile Lys Thr Ala Ser Thr Ile Ala Asn Ser Ser Lys Lys Val Arg Val Lys Leu Gly Asn Leu Glu Leu Tyr Val Glu Gln Glu Ser Val Pro Ser Thr TrpTyrPheLeu IleVal LeuPro ValLeuLeuVal IleValIle Phe AlaAlaValGly ValThr ArgHis LysSerLysGlu LeuSerArg Lys GlnSerGlnGln LeuGlu LeuLeu GluSerGluLeu ArgLysGlu Ile ArgAspGlyPhe AlaGlu LeuGln MetAspLysLeu AspValVal Asp Ser Phe Gly Thr Val Pro Phe Leu Asp Tyr Lys His Phe Ala Leu Arg TCA
ThrPhe Phe ProGlu Gly GlyPhe ThrHisIlePhe ThrGlu Asp Ser GCC
MetHis Asn ArgAsp Asn AspLys AsnGluSerLeu ThrAla Leu Ala AAT
AspAla Leu IleCys Lys SerPhe LeuValThrVal IleHis Thr Asn AAC
LeuGlu Lys GlnLys Phe SerVal LysAspArgCys LeuPhe Ala Asn Ser Phe Leu Thr Ile Ala Leu Gln Thr Lys Leu Val Tyr Leu Thr Ser Ile Leu Glu Val Leu Thr Arg Asp Leu Met Glu Gln Cys Ser Asn Met Gln Pro Lys Leu Met Leu Arg Arg Thr Glu Ser Val Val Glu Lys Leu Leu Thr Asn Trp Met Ser Val Cys Leu Ser Gly Phe Leu Arg Glu Thr Val Gly Glu Pro Phe Tyr Leu Leu Val Thr Thr Leu Asn Gln Lys Ile Asn Lys Gly Pro Val Asp Val Ile Thr Cys Lys Ala Leu Tyr Thr Leu Asn Glu Asp Trp Leu Leu Trp Gln Val Pro Glu Phe Ser Thr Val Ala Leu Asn Val Val Phe Glu Lys Ile Pro Glu Asn Glu Ser Ala Asp Val Cys Arg Asn Ile Ser Val Asn Val Leu Asp Cys Asp Thr Ile Gly Gln Ala Lys Glu Lys Ile Phe Gln Ala Phe Leu Ser Lys Asn Gly Ser Pro Tyr Gly Leu Gln Leu Asn Glu Ile Gly Leu Glu Leu Gln Met Gly Thr Arg Gln Lys Glu Leu Leu Asp Ile Asp Ser Ser Ser Val Ile Leu Glu Asp Gly Ile Thr Lys Leu Asn Thr Ile Gly His Tyr Glu Ile Ser Asn Gly Ser Thr Ile Lys Val Phe Lys Lys Ile Ala Asn Phe Thr Ser Asp Val Glu Tyr Ser Asp Asp His Cys His Leu Ile Leu Pro Asp Ser Glu Ala Phe Gln Asp Val Gln Gly Lys Arg His Arg Gly Lys His Lys Phe Lys Val Lys Glu Met Tyr Leu Thr Lys Leu Leu Ser Thr Lys Val Ala Ile His Ser Val Leu Glu Lys Leu Phe Arg Ser Ile Trp Ser Leu Pro Asn Ser Arg Ala Pro Phe Ala Ile Lys Tyr Phe Phe Asp Phe Leu Asp Ala Gln Ala Glu Asn Lys Lys Ile Thr Asp Pro Asp Val Val His Ile Trp Lys Thr Asn Ser Leu Pro Leu Arg Phe Trp Val Asn Ile Leu Lys Asn Pro Gln Phe Val Phe Asp Ile Lys Lys Thr Pro His Ile Asp Gly Cys Leu Ser Val Ile Ala Gln Ala Phe Met Asp Ala Phe Ser Leu Thr ACT
GluGlnGln LeuGly LysGluAla ProThrAsn LysLeuLeu TyrAla LysAspIle ProThr TyrLysGlu GluValLys SerTyrTyr LysAla IleArgAsp LeuPro ProLeuSer SerSerGlu MetGluGlu PheLeu ThrGlnGlu SerLys LysHisGlu AsnGluPhe AsnGluGlu ValAla LeuThrGlu IleTyr LysTyrIle ValLysTyr PheAspGlu IleLeu AsnLysLeu GluArg GluArgGly LeuGluGlu AlaGlnLys GlnLeu LeuHisVal LysVal LeuPheAsp GluLysLys LysCysLys TrpMet TAA
INFORMATION FOR SEQ ID N0:2:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 1569 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID N0:2:
Met Glu Val Ser Arg Arg Lys Ala Pro Pro Arg Pro Pro Arg Pro Ala Ala Pro Leu Pro Leu Leu Ala Tyr Leu Leu Ala Leu Ala Ala Pro Gly Arg Gly Ala Asp Glu Pro Val Trp Arg Ser Glu Gln Ala Ile Gly Ala Ile Ala Ala Ser Gln Glu Asp Gly Val Phe Val Ala Ser Gly Ser Cys Leu Asp Gln Leu Asp Tyr Ser Leu Glu His Ser Leu Ser Arg Leu Tyr 65 70 75 gp Arg Asp Gln Ala Gly Asn Cys Thr Glu Pro Val Ser Leu Ala Pro Pro Ala Arg Pro Arg Pro Gly Ser Ser Phe Ser Lys Leu Leu Leu Pro Tyr Arg Glu Gly Ala Ala Gly Leu Gly Gly Leu Leu Leu Thr Gly Trp Thr Phe Asp Arg Gly Ala Cys Glu Val Arg Pro Leu Gly Asn Leu Ser Arg Asn Ser Leu Arg Asn Gly Thr Glu Val Val Ser Cys His Pro Gln Gly Ser Thr Ala Gly Val Val Tyr Arg Ala Gly Arg Asn Asn Arg Trp Tyr Leu Ala Val Ala Ala Thr Tyr Val Leu Pro Glu Pro Glu Thr Ala Ser Arg Cys Asn Pro Ala Ala Ser Asp His Asp Thr Ala Ile Ala Leu Lys Asp Thr Glu Gly Arg Ser Leu Ala Thr Gln Glu Leu Gly Arg Leu Lys Leu Cys Glu Gly Ala Gly Ser Leu His Phe Val Asp Ala Phe Leu Trp Asn Gly Ser Ile Tyr Phe Pro Tyr Tyr Pro Tyr Asn Tyr Thr Ser Gly Ala Ala Thr Gly Trp Pro Ser Met Ala Arg Ile Ala Gln Ser Thr Glu Val Leu Phe Gln Gly Gln Ala Ser Leu Asp Cys Gly His Gly His Pro Asp Gly Arg Arg Leu Leu Leu Ser Ser Ser Leu Val Glu Ala Leu Asp Val Trp Ala Gly Val Phe Ser Ala Ala Ala Gly Glu Gly Gln Glu Arg Arg Ser Pro Thr Thr Thr Ala Leu Cys Leu Phe Arg Met Ser Glu Ile Gln Ala Arg Ala Lys Arg Val Ser Trp Asp Phe Lys Thr Ala Glu Ser His Cys Lys Glu Gly Asp Gln Pro Glu Arg Val Gln Pro Ile Ala Ser Ser Thr Leu Ile His Ser Asp Leu Thr Ser Val Tyr Gly Thr Val Val Met Asn Arg Thr Val Leu Phe Leu Gly Thr Gly Asp Gly Gln Leu Leu Lys Val Ile Leu Gly Glu Asn Leu Thr Ser Asn Cys Pro Glu Val Ile Tyr Glu Ile Lys Glu Glu Thr Pro Val Phe Tyr Lys Leu Val Pro Asp Pro Val Lys Asn Ile Tyr Ile Tyr Leu Thr Ala Gly Lys Glu Val Arg Arg Ile Arg Val Ala Asn Cys Asn Lys His Lys Ser Cys Ser Glu Cys Leu Thr Ala Thr Asp Pro His Cys Gly Trp Cys His Ser Leu Gln Arg Cys Thr Phe Gln Gly Asp Cys Val His Ser Glu Asn Leu Glu Asn Trp Leu Asp Ile Ser Ser Gly Ala Lys Lys Cys Pro Lys Ile Gln Ile Ile Arg Ser Ser Lys Glu Lys Thr Thr Val Thr Met Val Gly Ser Phe Ser Pro Arg His Ser Lys Cys Met Val Lys Asn Val Asp Ser Ser Arg Glu Leu Cys Gln Asn Lys Ser Gln Pro Asn Arg Thr Cys Thr Cys Ser Ile Pro Thr Arg Ala Thr Tyr Lys Asp Val Ser Val Val Asn Val Met Phe Ser Phe Gly Ser Trp Asn Leu Ser Asp Arg Phe Asn Phe Thr Asn Cys Ser Ser Leu Lys Glu Cys Pro Ala Cys Val Glu Thr Gly Cys Ala Trp Cys Lys Ser Ala Arg Arg Cys Ile His Pro Phe Thr Ala Cys Asp Pro Ser Asp Tyr Glu Arg Asn Gln Glu Gln Cys Pro Val Ala Val Glu Lys Thr Ser Gly Gly Gly Arg Pro Lys Glu Asn Lys Gly Asn Arg Thr Asn Gln Ala Leu Gln Val Phe Tyr Ile Lys Ser Ile Glu Pro Gln Lys Val Ser Thr Leu Gly Lys Ser Asn Val Ile Val Thr Gly Ala Asn Phe Thr Arg Ala Ser Asn Ile Thr Met Ile Leu Lys Gly Thr Ser Thr Cys Asp Lys Asp Val Ile Gln Val Ser His Val Leu Asn Asp Thr His Met Lys Phe Ser Leu Pro Ser Ser Arg Lys Glu Met Lys Asp Val Cys Ile Gln Phe Asp Gly Gly Asn Cys Ser Ser Val Gly Ser Leu Ser Tyr Ile Ala Leu Pro His Cys Ser Leu Ile Phe Pro Ala Thr Thr Trp Ile Ser Gly Gly Gln Asn Ile Thr Met Met Gly Arg Asn Phe Asp Val Ile Asp Asn Leu Ile Ile Ser His Glu Leu Lys Gly Asn Ile Asn Val Ser Glu Tyr Cys Val Ala Thr Tyr Cys Gly Phe Leu Ala Pro Ser Leu Lys Ser Ser Lys Val Arg Thr Asn Val Thr Val Lys Leu Arg Val Gln Asp Thr Tyr Leu Asp Cys Gly Thr Leu Gln Tyr Arg Glu Asp Pro Arg Phe Thr Gly Tyr Arg Val Glu Ser Glu Val Asp Thr Glu Leu Glu Val Lys Ile Gln Lys Glu Asn Asp Asn Phe Asn Ile Ser Lys Lys Asp Ile Glu Ile Thr Leu Phe His Gly Glu Asn Gly Gln Leu Asn Cys Ser Phe Glu Asn Ile Thr Arg Asn Gln Asp Leu Thr Thr Ile Leu Cys Lys Ile Lys Gly Ile Lys Thr Ala Ser Thr Ile Ala Asn Ser Ser Lys Lys Val Arg Val Lys Leu Gly Asn Leu Glu Leu Tyr Val Glu Gln Glu Ser Val Pro Ser Thr Trp Tyr Phe Leu Ile Val Leu Pro Val Leu Leu Val Ile Val Ile Phe Ala Ala Val Gly Val Thr Arg His Lys Ser Lys Glu Leu Ser Arg Lys Gln Ser Gln Gln Leu Glu Leu Leu Glu Ser Glu Leu Arg Lys Glu Ile Arg Asp Gly Phe Ala Glu Leu Gln Met Asp Lys Leu Asp Val Val Asp Ser Phe Gly Thr Val Pro Phe Leu Asp Tyr Lys His Phe Ala Leu Arg Thr Phe Phe Pro Glu Ser Gly Gly Phe Thr His Ile Phe Thr Glu Asp Met His Asn Arg Asp Ala Asn Asp Lys Asn Glu Ser Leu Thr Ala Leu Asp Ala Leu Ile Cys Asn Lys Ser Phe Leu Val Thr Val Ile His Thr Leu Glu Lys Gln Lys Asn Phe Ser Val Lys Asp Arg Cys Leu Phe Ala Ser Phe Leu Thr Ile Ala Leu Gln Thr Lys Leu Val Tyr Leu Thr Ser Ile Leu Glu Val Leu Thr Arg Asp Leu Met Glu Gln Cys Ser Asn Met Gln Pro Lys Leu Met Leu Arg Arg Thr Glu Ser Val Val Glu Lys Leu Leu Thr Asn Trp Met Ser Val Cys Leu Ser Gly Phe Leu Arg Glu Thr Val Gly Glu Pro Phe Tyr Leu Leu Val Thr Thr Leu Asn Gln Lys Ile Asn Lys Gly Pro Val Asp Val Ile Thr Cys Lys Ala Leu Tyr Thr Leu Asn Glu Asp Trp Leu Leu Trp Gln Val Pro Glu Phe Ser Thr Val Ala Leu Asn Val Val Phe Glu Lys Ile Pro Glu Asn Glu Ser Ala Asp Val Cys Arg Asn Ile Ser Val Asn Val Leu Asp Cys Asp Thr Ile Gly Gln Ala Lys Glu Lys Ile Phe Gln Ala Phe Leu Ser Lys Asn Gly Ser Pro Tyr Gly Leu Gln Leu Asn Glu Ile Gly Leu Glu Leu Gln Met Gly Thr Arg Gln Lys Glu Leu Leu Asp Ile Asp Ser Ser Ser Val Ile Leu Glu Asp Gly Ile Thr Lys Leu Asn Thr Ile Gly His Tyr Glu Ile Ser Asn Gly Ser Thr Ile Lys Val Phe Lys Lys Ile Ala Asn Phe Thr Ser Asp Val Glu Tyr Ser Asp Asp His Cys His Leu Ile Leu Pro Asp Ser Glu Ala Phe Gln Asp Val Gln Gly Lys Arg His Arg Gly Lys His Lys Phe Lys Val Lys Glu Met Tyr Leu Thr Lys Leu Leu Ser Thr Lys Val Ala Ile His Ser Val Leu Glu Lys Leu Phe Arg Ser Ile Trp Ser Leu Pro Asn Ser Arg Ala Pro Phe Ala Ile Lys Tyr Phe Phe Asp Phe Leu Asp Ala Gln Ala Glu Asn Lys Lys Ile Thr Asp Pro Asp Val Val His Ile Trp Lys Thr Asn Ser Leu Pro Leu Arg Phe Trp Val Asn Ile Leu Lys Asn Pro Gln Phe Val Phe Asp Ile Lys Lys Thr Pro His Ile Asp Gly Cys Leu Ser Val Ile Ala Gln Ala Phe Met Asp Ala Phe Ser Leu Thr Glu Gln Gln Leu Gly Lys Glu Ala Pro Thr Asn Lys Leu Leu Tyr Ala Lys Asp Ile Pro Thr Tyr Lys Glu Glu Val Lys Ser Tyr Tyr Lys Ala Ile Arg Asp Leu Pro Pro Leu Ser Ser Ser Glu Met Glu Glu Phe Leu Thr Gln Glu Ser Lys Lys His Glu Asn Glu Phe Asn Glu Glu Val Ala Leu Thr Glu Ile Tyr Lys Tyr Ile Val Lys Tyr Phe Asp Glu Ile Leu Asn Lys Leu Glu Arg Glu Arg Gly Leu Glu Glu Ala Gln Lys Gln Leu Leu His Val Lys Val Leu Phe Asp Glu Lys Lys Lys Cys Lys Trp Met
In this manner, the effector can be identified as a substance that either promotes cellular efflux or inhibits cellular efflux and then can be used therapeutically. Alternatively, the test compound may S itself be a semaphorin or semaphorin receptor or fragment or antagonist or agonist thereof.
Any dye may be used in the assays of the present invention. The dyes useful in such methods may be characterized by, for example, one or more of the following properties:
lipophilic, cationic, fluorescent, and radioactive. Alternatively or additionally, the dye used in such methods can be a slow dye, a fast dye, acridine orange, BODIPY ceramide, SNARF-dextran, FITC-transferrin or BODIPY-transferrin.
As with all compositions and methods of the present invention, the semaphorin or semaphorin receptor used in this method can be any known semaphorin or semaphorin receptor polypeptide or useful fragment thereof, such as a fragment comprising the sema domain or the active domain of a semaphorin or semaphorin receptor. Additionally or alternatively, the presently disclosed method can be performed with any known semaphorin or semaphorin receptor, or fragment thereof being the test compound, or with an antibody to VESPR as the test compound.
In yet another aspect, the present invention provides pharmaceutical compositions and methods for the regulation of cellular-efflux, or MDR phenotype, by using the agent identified by the assays described herein. In this aspect of the invention, the modulating agent is effective to either inhibit or activate cellular efflux or development of drug resistance in a target cell.
IV. DETAILED DESCRIPTION OF THE INVENTION
Contrary to the results of Yamada et al., who postulate that semaphorins function analogously to growth factors and may be involved in non-MDR drug resistance, the present invention teaches that semaphorins and semaphorin receptors can be used to influence the function of cellular efflux pumps in a variety of ways, including activation, inhibition, and promotion of stasis of the pumps and can be used to regulate MDR. The invention also teaches that, depending upon the specific semaphorin/receptor interaction, this influence can be inhibitory, and the capacity of a cell to eliminate cellular contents can be reduced, or the influence can be to promote cellular efflux and thereby facilitate expulsion of cellular contents. Accordingly, depending upon the effect, the disclosed semaphorin and semaphorin receptor compositions and methods are also useful:
(1) to increase vulnerability or sensitivity of a cell to cytotoxic agents and thereby promote drug-induced cell death;
(2) in identification or design of semaphorin or semaphorin receptor antagonists or agonists that might increase the sensitivity of a cell to a cytotoxic agent; (3) to promote cellular resistance to cytotoxic agents; or (4) in identification of semaphorin or semaphorin receptor agonists or antagonists that can be administered to cells to promote their resistance to various cytotoxic substances.
A. SEMAPHORIN AND SEMAPHORIN RECEPTOR POLYPEPTIDES
The terms "semaphorin" and "semaphorin polypeptide" are used interchangeably in the present invention. Semaphorins include proteins of the Semaphorin family and are either secreted or membrane-bound. Semaphorins have a well-conserved extracellular semaphorin (sema) domain.
Generally, the sema domain is approximately 500 residues, but viral semaphorins themselves are only approximately 440 to 441 amino acids in length. It has been hypothesized that a 70 amino acid region with the sema domain is the active domain for semaphorin influence on certain cellular activities. See Koppel, et al. (1997). However it is not clear that this same region is the active site for all semaphorin activity. Accordingly, the present invention specifically contemplates the use of full-length semaphorin polypeptides, variants of these, and useful fragments of semaphorin polypeptides.
Specific semaphorins and semaphorin fragments that are useful according to the present invention include, for example, the following semaphorins: AHV Sema; A39R; Sema I, including G-sema I and D-sema-I; Sema II; Sema III; Sema IV; DC Sema; CD100; Z SMF-7; Sema A; Sema B;
Sema C;
Sema D; Sema E; Sema H; Sema L; Sema W and Sema Y. Additionally, useful fragments of any 1 S semaphorin, such as the sema domain or the active domain may also be used according to the present invention. For additional semaphorins that can be used in the presently disclosed compositions and methods, see Bamberg, et.al. Cell, 97:551 and United States Patent No.
5,935,865 to Goodman et al.
Nucleic acid sequences encoding the semaphorins or semaphorin fragments of the present invention, are also specifically contemplated to be useful in the disclosed compositions and methods.
"Semaphorin receptors" or "semaphorin receptor polypeptides" of the present invention are members of the Plexin family of semaphorin receptors. Plexins are membrane-bound polypeptides.
Plexins contain a "sema" domain that is related to the sema domain of semaphorins themselves, part of which constitutes a series of two or three cystein repeat sequences in the extracellular domain of plexins. Plexins are distinct from semaphorins, however, in a variety of respects. For example, in their intracellular domain, plexins are strongly homologous throughout the family of plexins, and contain well-conserved amino acid motifs that are not found in semaphorins.
Semaphorin receptors of the present invention are those plexin polypeptide sequences that can interact with a semaphorin or a semaphorin fragment, to influence cellular efflux or development of MDR phenotype in a cell Exemplary semaphorin receptor polypeptides include full-length plexin receptor polypeptides as well as homologues or fragments, such as the soluble extra cellular domain or the sema domain of such plexin receptor polypeptides. Preferred semaphorin receptor polypeptides include the Viral Encoded Semaphorin Receptor (VESPR) or fragments thereof. As used herein, the term VESPR or VESPR polypeptide refers to any polypeptide functioning as a receptor for viral semaphorins, for human homologues to viral semaphorins, or for human semaphorins.
Additionally, useful soluble forms of the VESPR polypeptide include those segments of the polypeptide comprising a portion of the extracellular domain of the receptor.
An example of a soluble VESPR polypeptide includes amino acids 1-944 of SEQ ID N0:2. In addition, truncated soluble VESPR proteins comprising less that the entire extracellular domain are included in the invention, e.g., S amino acids 35-944. Also encompassed within the present invention are the nucleic acid sequences encoding such useful VESPR polypeptides and polypeptide fragments. An exemplary Plexin receptor is the Viral Encoded Semaphorin Protein Receptor "VESPR," (described in copending patent application serial number 08/958,598). Specifically the amino acid sequence of SEQ ID N0:2 is useful as a semaphorin receptor polypeptide in the presently disclosed compositions and methods, as are the homologues and variants of polypeptides of SEQ ID N0:2. Nucleic acid sequences encoding the semaphorin receptors or receptor fragments are also within the scope of the presently disclosed compositions and methods. Particularly preferred nucleic acid sequences include the polynucleotide sequence of SEQ ID NO:I; and those segments of SEQ ID NO:1 that encode the soluble fragments of VESPR outlined above.
The semaphorin or semaphorin receptor polypeptides of the invention may be membrane bound or they may be secreted and thus soluble. Soluble polypeptides are capable of being secreted from the cells in which they are expressed. In general, soluble polypeptides may be identified (and distinguished from non-soluble membrane-bound counterparts) by separating intact cells which express the desired polypeptide from the culture medium, e.g., by centrifugation, and assaying the medium (supernatant) for the presence of the desired polypeptide. The presence of polypeptide in the medium indicates that the polypeptide was secreted from the cells and thus is a soluble form of the protein.
In one embodiment, the soluble polypeptides and fragments thereof comprise all or part of the extracellular domain, but lack the transmembrane region that would cause retention of the polypeptide on a cell membrane. A soluble polypeptide may include the cytoplasmic domain, or a portion thereof, as long as the polypeptide is secreted from the cell in which it is produced.
In general, the use of soluble forms is advantageous for certain applications.
Purification of the polypeptides from recombinant host cells is facilitated, since the soluble polypeptides are secreted from the cells. Further, soluble polypeptides are generally more suitable for intravenous administration.
The invention also provides polypeptides and fragments of the extracellular domain that retain a desired biological activity. Particular embodiments are directed to polypeptide fragments that retain the ability to interact with the semaphorin receptor or ligand to influence cellular efflux or the MDR
phenotype of a cell. Such a fragment may be a soluble polypeptide, as described above. In another embodiment, the polypeptides and fragments advantageously include regions that are conserved in the semaphorin family, in the case of semaphorins; or regions that are conserved in the plexin family in the case of the semaphorin receptors; or include the sema domain of either.
Also provided herein are polypeptide fragments comprising at least 20, or at least 30, contiguous amino acids of the sequence of SEQ ID N0:2. Fragments derived from the cytoplasmic domain fmd use in studies of signal transduction, and in regulating cellular processes associated with transduction of biological signals. Polypeptide fragments also may be employed as immunogens, in generating antibodies.
Naturally occurring variants as well as derived variants of the polypeptides and fragments are provided herein. Variants may exhibit amino acid sequences that are at least 80% identical. Also contemplated are embodiments in which a polypeptide or fragment comprises an amino acid sequence that is at least 90% identical, at least 95% identical, at least 98%
identical, at least 99% identical, or at least 99.9% identical to the preferred polypeptide or fragment thereof.
Percent identity can be determined by visual inspection and mathematical calculation. Alternatively, the percent identity of two protein sequences can be determined by comparing sequence information using the GAP computer program, based on the algorithm of Needleman and Wunsch (J. Mol. Bio. 48:443, 1970) and available from the University of Wisconsin Genetics Computer Group (UWGCG). The preferred default parameters for the GAP program include: (1) a scoring matrix, blosum62, as described by Henikoff and Henikoff (Proc. Natl. Acad. Sci. USA 89:10915, 1992); (2) a gap weight of 12; (3) a gap length weight of 4; and (4) no penalty for end gaps. Other programs used by one skilled in the art of sequence comparison may also be used.
The variants of the invention include, for example, those that result from alternate mRNA
splicing events or from proteolytic cleavage. Alternate splicing of mRNA may, for example, yield a truncated but biologically active protein, such as a naturally occurring soluble form of the protein.
Variations attributable to proteolysis include, for example, differences in the N- or C-termini upon expression in different types of host cells, due to proteolytic removal of one or more terminal amino acids from the protein (generally from 1-5 terminal amino acids). Proteins in which differences in amino acid sequence are attributable to genetic polymorphism (allelic variation among individuals producing the protein) are also contemplated herein.
Additional variants within the scope of the invention include polypeptides that may be modified to create derivatives thereof by forming covalent or aggregative conjugates with other chemical moieties, such as glycosyl groups, lipids, phosphate, acetyl groups and the like. Covalent derivatives may be prepared by linking the chemical moieties to functional groups on amino acid side chains or at the N-terminus or C-terminus of a polypeptide. Conjugates comprising diagnostic (detectable) or therapeutic agents attached thereto are contemplated herein, as discussed in more detail below.
Other derivatives include covalent or aggregative conjugates of the polypeptides with other proteins or polypeptides, such as by synthesis in recombinant culture as N-terminal or C-terminal fusions. Examples of fusion proteins are discussed below in connection with oligomers. Further, fusion proteins can comprise peptides added to facilitate purification and identification. Such peptides S include, for example, poly-His or the antigenic identification peptides described in U.S. Patent No.
5,011,912 and in Hopp et al., BiolTechnology 6:1204, 1988. One such peptide is the FLAG~ peptide, Asp-Tyr-Lys-Asp-Asp-Asp-Asp-Lys, which is highly antigenic and provides an epitope reversibly bound by a specific monoclonal antibody, enabling rapid assay and facile purification of expressed recombinant protein. A murine hybridoma designated 4E11 produces a monoclonal antibody that binds the FLAG~ peptide in the presence of certain divalent metal canons, as described in U.S. Patent 5,011,912, hereby incorporated by reference. The 4E11 hybridoma cell line has been deposited with the American Type Culture Collection under accession no. HB 9259. Monoclonal antibodies that bind the FLAG~ peptide are available from Eastman Kodak Co., Scientific Imaging Systems Division, New Haven, Connecticut.
Among the variant polypeptides provided herein are variants of native polypeptides that retain the native biological activity or the substantial equivalent thereof. One example is a variant that binds with essentially the same binding affinity as does the native form. Binding affinity can be measured by conventional procedures, e.g., as described in U.S. Patent No. 5,512,457 and as set forth below.
Variants include polypeptides that are substantially homologous to the native form, but which have an amino acid sequence different from that of the native form because of one or more deletions, insertions or substitutions. Particular embodiments include, but are not limited to, polypeptides that comprise from one to ten deletions, insertions or substitutions of amino acid residues, when compared to a native sequence.
A given amino acid may be replaced, for example, by a residue having similar physiochemical characteristics. Examples of such conservative substitutions include substitution of one aliphatic residue for another, such as Ile, Val, Leu, or Ala for one.another;
substitutions of one polar residue for another, such as between Lys and Arg, Glu and Asp, or Gln and Asn; or substitutions of one aromatic residue for another, such as Phe, Trp, or Tyr for one another. Other conservative substitutions, e.g., involving substitutions of entire regions having similar hydrophobicity characteristics, are well known.
Similarly, the DNAs of the invention include variants that differ from a native DNA sequence because of one or more deletions, insertions or substitutions, but that encode a biologically active polypeptide.
The invention further includes polypeptides of the invention with or without associated native-pattern glycosylation. Polypeptides expressed in yeast or mammalian expression systems (e.g., COS-1 or COS-7 cells) can be similar to or significantly different from a native polypeptide in molecular weight and glycosylation pattern, depending upon the choice of expression system. Expression of polypeptides of the invention in bacterial expression systems, such as E.
coli, provides non-glycosylated molecules. Further, a given preparation may include multiple differentially glycosylated species of the protein. Glycosyl groups can be removed through conventional methods, in particular those utilizing glycopeptidase. In general, glycosylated polypeptides of the invention can be incubated with a molar excess of glycopeptidase (Boehringer Mannheim).
Correspondingly, similar DNA constructs that encode various additions or substitutions of amino acid residues or sequences, or deletions of terminal or internal residues or sequences are encompassed by the invention. For example, N-glycosylation sites in the polypeptide extracellular domain can be modified to preclude glycosylation, allowing expression of a reduced carbohydrate analog in mammalian and yeast expression systems. N-glycosylation sites in eukaryotic polypeptides are characterized by an amino acid triplet Asn-X-Y, wherein X is any amino acid except Pro and Y is Ser or T'hr. Appropriate substitutions, additions, or deletions to the nucleotide sequence encoding these triplets will result in prevention of attachment of carbohydrate residues at the Asn side chain.
Alteration of a single nucleotide, chosen so that Asn is replaced by a different amino acid, for example, is sufficient to inactivate an N-glycosylation site. Alternatively, the Ser or Thr can by replaced with another amino acid, such as Ala. Known procedures for inactivating N-glycosylation sites in proteins include those described in U.S. Patent 5,071,972 and EP
276,846, hereby incorporated by reference.
In another example of variants, sequences encoding Cys residues that are not essential for biological activity can be altered to cause the Cys residues to be deleted or replaced with other amino acids, preventing formation of incorrect intramolecular disulfide bridges upon folding or renaturation.
Other variants are prepared by modification of adjacent dibasic amino acid residues, to enhance expression in yeast systems in which KEX2 protease activity is present. EP 212,914 discloses the use of site-specific mutagenesis to inactivate KEX2 protease processing sites in a protein. KEX2 protease processing sites are inactivated by deleting, adding or substituting residues to alter Arg-Arg, Arg-Lys, and Lys-Arg pairs to eliminate the occurrence of these adjacent basic residues. Lys-Lys pairings are considerably less susceptible to KEX2 cleavage, and conversion of Arg-Lys or Lys-Arg to Lys-Lys represents a conservative and preferred approach to inactivating KEX2 sites.
Encompassed by the invention are oligomers or fusion proteins that contain semaphorin or semaphorin receptor polypeptides. Such oligomers may be in the form of covalently-linked or non-covalently-linked multimers, including dimers, trimers, or higher oligomers.
As noted above, preferred polypeptides are soluble and thus these oligomers may comprise soluble polypeptides. In one aspect of the invention, the oligomers maintain the binding ability of the polypeptide components and provide therefor, bivalent, trivalent, etc., binding sites.
One embodiment of the invention is directed to oligomers comprising multiple polypeptides joined via covalent or non-covalent interactions between peptide moieties fused to the polypeptides.
Such peptides may be peptide linkers (spacers), or peptides that have the property of promoting oligomerization. Leucine zippers and certain polypeptides derived from antibodies are among the peptides that can promote oligomerization of the polypeptides attached thereto, as described in more detail below.
As one alternative, an oligomer is prepared using polypeptides derived from immunoglobulins.
Preparation of fusion proteins comprising certain heterologous polypeptides fused to various portions of antibody-derived polypeptides (including the Fc domain) has been described, e.g., by Ashkenazi et al. (PNAS USA 88:10535, 1991); Byrn et al. (Nature 344:677, 1990); and Hollenbaugh and Aruffo ("Construction of Immunoglobulin Fusion Proteins", in Current Protocols in Immunology, Suppl. 4, pages 10.19.1 - 10.19.11, 1992).
One embodiment of the present invention is directed to a dimer comprising two fusion proteins created by fusing a polypeptide of the invention to an Fc polypeptide derived from an antibody. A gene fusion encoding the polypeptide/Fc fusion protein is inserted into an appropriate expression vector. Polypeptide/Fc fusion proteins are expressed in host cells transformed with the recombinant expression vector, and allowed to assemble much like antibody molecules, whereupon interchain disulfide bonds form between the Fc moieties to yield divalent molecules.
The term "Fc polypeptide" as used herein includes native and mutein forms of polypeptides made up of the Fc region of an antibody comprising any or all of the CH
domains of the Fc region.
Truncated forms of such polypeptides containing the hinge region that promotes dimerization are also included. Preferred polypeptides comprise an Fc polypeptide derived from a human IgGI antibody.
One suitable Fc polypeptide, described in PCT application WO 93/10151 (hereby incorporated by reference), is a single chain polypeptide extending from the N-terminal hinge region to the native C-terminus of the Fc region of a human IgGI antibody. Another useful Fc polypeptide is the Fc mutein described in U.S. Patent 5,457,035 and in Baum et al., (EMBO J. 13:3992-4001, 1994) incorporated herein by reference. The amino acid sequence of this mutein is identical to that of the native Fc sequence presented in WO 93/10151, except that amino acid 19 has been changed from Leu to Ala, amino acid 20 has been changed from Leu to Glu, and amino acid 22 has been changed from Gly to Ala. The mutein exhibits reduced affinity for Fc receptors.
The above-described fusion proteins comprising Fc moieties (and oligomers formed therefrom) offer the advantage of facile purification by affinity chromatography over Protein A or Protein G columns.
In other embodiments, the polypeptides of the invention may be substituted for the variable portion of an antibody heavy or light chain. If fusion proteins are made with both heavy and light chains of an antibody, it is possible to form an oligomer with as many as four semaphorin or semaphorin receptor extracellular regions.
Alternatively, the oligomer is a fusion protein comprising multiple polypeptides, with or without peptide linkers (spacer peptides). Among the suitable peptide linkers are those described in U.S. Patents 4,751,180 and 4,935,233, which are hereby incorporated by reference. A DNA sequence encoding a desired peptide linker may be inserted between, and in the same reading frame as, the DNA
sequences of the invention, using any suitable conventional technique. For example, a chemically synthesized oligonucleotide encoding the linker may be ligated between the sequences. In particular embodiments, a fusion protein comprises from two to four soluble semaphorin or semaphorin receptor polypeptides, separated by peptide linkers.
Another method for preparing the oligomers of the invention involves use of a leucine zipper.
Leucine zipper domains are peptides that promote oligomerization of the proteins in which they are found. Leucine zippers were originally identified in several DNA-binding proteins (Landschulz et al., Science 240:1759, 1988), and have since been found in a variety of different proteins. Among the known leucine zippers are naturally occurring peptides and derivatives thereof that dimerize or trimerize. Zipper domains (also referred to herein as an oligomerizing, or oligomer-forming, domain) and their use are well-known in the art.
B. ASSAYS
The influence of semaphorins on cellular efflux may be used to control the development of MDR phenotypes of a cell or group of cells. For example, semaphorin polypeptides, or polynucleotides encoding semaphorin polypeptides may be administered to a cell or group of cells to stimulate or inhibit cellular efflux, to either induce, enhance, suppress or arrest the development of multiple drug resistance in the target cells. Identification of semaphorin-containing compositions that may be used in this manner may be carried out via a variety of assays known to those skilled in the art.
Included in such assays are those that evaluate the ability of a semaphorin composition to influence cell survival rates in the presence of cytotoxic agents. Such an assay would involve, for example, the determination of sensitivities of tumor cells or cell lines to anticancer drugs in the presence and absence of a semaphorin. In these assays, one would determine a rate of cell death in the presence of the cytotoxic agent (such as doxorubicin, etc.) and then determine if the rate of cell death resulting from that agent is altered in the presence of a semaphorin.
Alternatively, one might monitor MDR protein-like activity in a cell by examining the ability of primary cells, or cells overexpressing MDR proteins, to efflux dyes in the presence and absence of a semaphorin. These types of assays are routine, and employ what are referred to as either "slow" or "fast" cellular dyes, that is, dyes that are typically lipophilic, or cationic. (see, e.g., Lelong, et al., 1991). One example of use of these dyes involves loading the dye into a cell at low temperatures, such as 4 degrees (or on ice), and then examining the stained cells by flow cytometry. The cells will fluoresce depending on how much dye they take up; and, if loaded in the presence of an MDR efflux pump inhibitor such as verapamil or cyclosporin, or a semaphorin of the present invention, they may fluoresce more brightly than cells loaded in the absence of an MDR inhibitor.
In this manner S inhibitors of cellular efflux pumps can be identified. This assay may then also be taken a step further by transferring the cells loaded with dye to elevated temperature conditions, such as 37 degrees Centigrade, for a period of time, such as approximately three hours, at which time the cells are again examined on the flow cytometer, and compared to cells that were loaded with dye and held at cooler temperatures, such as the previously noted 4 degrees. At higher temperatures, cellular efflux pumps, including the MDR proteins, are quite active and can extrude the dye from the cell at a rapid rate. The ability of a semaphorin to influence this efflux can be measured by including the semaphorin in the assay during the efflux phase.
Yet another assay that may be used in the present invention involves examining intracellular pH, and the pH of intracellular compartments, in response to semaphorins.
These types of assays again use fluorescent probes that target to the cytoplasm or to specific organelles, and exhibit fluorescence pattern changes as the pH changes. See, e.g. Altan, N et al. J.
Exp. Med. 187:1583, Altan, N et al. PNAS 96:4432, Chen, Y et al. JBC 274:18364, Schindler, M. et al. Biochemistry 35:2811.. Dyes that are useful in such assays include dyes such as acridine orange (which targets acidic compartments and whose fluorescent wavelength and intensity depends on the pH of that organelle), BODIPY-ceramide (which targets the trans-golgi network), SNARF-dextrans of varying molecular weights (allowing one to target cytosol or nucleus), and FITC-transferrin or BODIPY-transferrin (which targets endocytic vesicles). These dyes are used to stain cells and then their fluorescence intensity and/or pattern is measured on a confocal microscope.
Another embodiment of the present invention provides a method of detecting the ability of the test compound to influence the MDR phenotype of a cell. In this aspect of the invention, the method includes contacting a first cell with a test compound including a semaphorin or semaphorin receptor in the presence of a cytotoxic agent. The method then involves measuring the rate of death of that first cell. Then the rate of death of a controlled cell is observed, with the control cell under similar conditions but in the absence of a test compound comprising a semaphorin or semaphorin receptor, and in the presence of a cytotoxic agent, which is the same agent administered to the first cell. The death rate of the first cell is then compared to the death rate of the control cell and the difference in the rate of cell death between the first cell and the control cell is indicative of an agent that influences development of multiple drug resistance phenotype. This agent may be one that functions to increase multiple drug resistance in the cell or to decrease multiple drug resistance in the cell.
In addition to those semaphorins listed in Section III above, specific semaphorins that may be tested according to this embodiment of the invention include A39R, DCSema, CD100, Sema III, Sema E, or active fragments of these semaphorins. Specific exemplary useful semaphorin receptors that may be used in these assays include VESPR. Alternatively, an agonist or antagonist to a semaphorin or semaphorin receptor may used according to this aspect of the invention. In a particularly preferred embodiment, an antibody to VESPR is used. Examples of cytotoxic agents that may be used in this method of detection include doxorubicin, radiation, tamoxifen, or any other compound known to have a cytotoxic effect on a cell.
In another aspect, the present invention provides a method of detecting the ability of a test compound to influence the MDR phenotype of a cell by modulating the cellular efflux of that cell. In this aspect, one example of such a method includes: (1) contacting a first cell with a test compound including a semaphorin or semaphorin receptor in the presence of a dye; (2) measuring the net rate of influx of dye into this first cell; and (3) observing the net rate of influx of dye into a control cell under similar conditions, but in the absence of a test compound comprising a semaphorin or semaphorin receptor. In this embodiment, the net rate of influx of dye is the rate of influx of dye relative to the rate of efflux, as measured by the amount of dye detected in the cell. The comparison will provide a difference in the net rate of influx of the dye such that influx of the dye into the first cell relative to the control cell is indicative of an agent that can influence cellular efflux. The test compound may function to either activate or up-regulate, or inhibit or down-regulate cellular efflux, either of which function may be detected through this method.
In addition to the semaphorins listed in Section III above, specific semaphorins that may be tested according to this embodiment of the invention include A39R, DCSema, CD100, Sema III, Sema E, or active fragments of these semaphorins. Specific exemplary useful semaphorin receptors that may be used in these assays include VESPR. Alternatively, an agonist or antagonist to a semaphorin or semaphorin receptor may used according to this aspect of the invention. In a particularly preferred embodiment, an antibody to VESPR is used.
Virtually any dye may be used in this method. Exemplary dyes include those which are characterized by one or more of the following properties: lipophilic, cationic, fluorescent, and radioactive. Specific exemplary dyes include a slow dye; a fast dye; acridine orange; various BODIPY
dyes including specific ones such as 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene-3,5-dipropionic acid, BODIPY ceramide, and BODIPY-transferrin; seminaphthorhodafluors ("SNARF") -dextran; and Fluorescien isothiocyanate ("FITC")-transferrin.
C. COMPOUNDS AND METHODS FOR THE MODULATION OF CELLULAR EFFLUX
Described below are methods and compositions employing semaphorins, semaphorin receptors, fragments of these, or the genes encoding them, for use in the promotion or suppression of cellular efflux or for controlling development of MDR in a target cell or group of cells. It is specifically contemplated that such compositions and methods can be used to treat a cell or group of cells both in vivo and in vitro.
For example, such methods can comprise administering compounds which modulate cellular efflux, and thereby influence development of MDR phenotype or cellular efflux-related disease states.
Administration of such compounds can be used to inhibit drug resistance thereby sensitizing cells to cytotoxic substances; to promote resistance to cytotoxic substances and protect against cytotoxic substances; or to the dysregulation of cellular efflux in cells that are unable to otherwise regulate themselves, such as those cells associated with diseases such as cystic fibrosis.
In addition to methods utilizing semaphorin or semaphorin receptor-encoding nucleic acid sequences, it is also useful to modulate cellular efflux by using the semaphorin or semaphorin receptor polypeptide, or polypeptide fragments. Another means of modulating cellular efflux or MDR
phenotypes according to the present invention involves the use of any of the compounds identified through the assays set forth in Section B above.
1 S When the actual nucleic acid sequences encoding the semaphorins;
semaphorin receptors; or fragments of either that are disclosed in the present invention are delivered according to the methods described herein, it is advantageous to use a delivery mechanism so that the sequences will be incorporated into a cell for expression. Delivery systems that may advantageously be employed in the contemplated methods include the use of, for example, viral delivery systems such as retroviral and adenoviral vectors, as well as non-viral delivery systems. Such delivery systems are well known by those skilled in the art.
In one aspect of the invention, a retroviral delivery system may be employed.
The retroviruses are a group of single-stranded RNA viruses characterized by an ability to convert their RNA to double-stranded DNA in infected cells by a process of reverse-transcription (Coffin, 1990). The resulting DNA then stably integrates into cellular chromosomes as a provirus and directs synthesis of viral proteins.
The integration results in the retention of the viral gene sequences in the recipient cell and its descendants.
The retroviral genome contains three genes - gag, pol, and env - that code for capsid proteins, polymerise enzyme, and envelope components, respectively. A sequence found upstream from the gag gene, termed y~, functions as a signal for packaging of the genome into virions. Two long terminal repeat (LTR) sequences are present at the 5' and 3' ends of the viral genome. These contain strong promoter and enhancer sequences and are also required for integration in the host cell genome (Coffin, 1990).
1n order to construct a retroviral vector, a nucleic acid encoding a Crrb2 or Crkl antisense construct is inserted into the viral genome in the place of certain viral sequences to produce a virus that is replication-defective. In order to produce virions, a packaging cell line containing the gag, pol and env genes but without the LTR and y~ components is constructed (Mann et al., 1983). When a recombinant plasmid containing an inserted DNA, together with the retroviral LTR and yr sequences, is introduced into this cell line (by calcium phosphate precipitation for example), the y sequence allows the RNA transcript of the recombinant plasmid to be packaged into viral particles, which are then secreted into the culture media (Nicolas and Rubenstein, 1988; Temin, 1986; Mann et al., 1983). The media containing the recombinant retroviruses is then collected, optionally concentrated, and used for gene transfer. Retroviral vectors are able to infect a broad variety of cell types. However, integration and stable expression require the division of host cells (Paskind et al., 1975).
Alternatively, an adenoviral delivery system may be employed. Human adenoviruses are double-stranded DNA tumor viruses with genome sizes of approximate 36 kB
(Tooze, 1981). As a model system for eukaryotic gene expression, adenoviruses have been widely studied and well characterized, which makes them an attractive system for development of adenovirus as a gene transfer system. This group of viruses is easy to grow and manipulate, and they exhibit a broad host range in vitro and in vivo.
In lytically infected cells, adenoviruses are capable of shutting off host protein synthesis, directing cellular machineries to synthesize large quantities of viral proteins, and producing copious amounts of virus.
The El region of the genome includes ElA and E1B which encode proteins responsible for transcription regulation of the viral genome, as well as a few cellular genes.
E2 expression, including E2A and E2B, allows synthesis of viral replicative functions, e.g. DNA-binding protein, DNA
polymerase, and a terminal protein that primes replication. E3 gene products prevent cytolysis by cytotoxic T cells and tumor necrosis factor and appear to be important for viral propagation. Functions associated with the E4 proteins include DNA replication, late gene expression, and host cell shutoff. The late gene products include most of the virion capsid proteins, and these are expressed only after most of the processing of a single primary transcript from the major late promoter has occurred. The major late promoter (MLP) exhibits high efficiency during the late phase of the infection (Stratford-Perricaudet and Perricaudet, 1991 ).
As only a small portion of the viral genome appears to be required in cis (Tooze, 1981), adenovirus-derived vectors offer excellent potential for the substitution of large DNA fragments when used in connection with cell lines such as 293 cells. Ad5-transformed human embryonic kidney cell lines (Graham, et al., 1977) have been developed to provide the essential viral proteins in traps.
Particular advantages of an adenovirus system for delivering foreign proteins to a cell include (i) the ability to substitute relatively large pieces of viral DNA by foreign DNA;
(ii) the structural stability of recombinant adenoviruses; (iii) the safety of adenoviral administration to humans; and (iv) lack of any known association of adenoviral infection with cancer or malignancies; (v) the ability to obtain high titers of the recombinant virus; and (vi) the high infectivity of adenovirus.
Further advantages of adenovirus vectors over retroviruses include the higher levels of gene 3 S expression. Additionally, adenovirus replication is independent of host gene replication, unlike retroviral sequences. Because adenovirus transforming genes in the E1 region can be readily deleted and still provide efficient expression vectors, oncogenic risk from adenovirus vectors is thought to be negligible (Gnmhaus & Horwitz, 1992).
In general, adenovirus gene transfer systems are based upon recombinant, engineered adenovirus which is rendered replication-incompetent by deletion of a portion of its genome, such as E1, and yet still retains its competency for infection. Sequences encoding relatively large foreign proteins can be expressed when additional deletions are made in the adenovirus genome. For example, adenoviruses deleted in both E1 and E3 regions are capable of carrying up to 10 kB of foreign DNA and can be grown to high titers in 293 cells (Stratford-Perncaudet and Perricaudet, 1991).
Surprisingly persistent expression of transgenes following adenoviral infection has also been reported.
Other viral vectors may be employed as expression constructs in the present invention. Vectors derived from viruses such as vaccinia virus (Ridgeway, 1988; Baichwal and Sugden, 1986; Coupar et al., 1988) adeno-associated virus (AAV) (Ridgeway, 1988; Baichwal and Sugden, 1986;
Hermonat and Muzycska, 1984) and herpesviruses may be employed. They offer several attractive features for various mammalian cells (Friedmann, 1989; Ridgeway, 1988; Baichwal and Sugden, 1986;
Coupar et al., 1988;
Norwich et al., 1990).
With the recent recognition of defective hepatitis B viruses, new insight was gained into the structure-function relationship of different viral sequences. In vitro studies showed that the virus could retain the ability for helper-dependent packaging and reverse transcription despite the deletion of up to 80% of its genome (Norwich et al., 1990). This suggested that large portions of the genome could be replaced with foreign genetic material. The hepatotropism and persistence (integration) were particularly attractive properties for liver-directed gene transfer. Chang et al. recently introduced the chloramphenicol acetyltransferase (CAT) gene into duck hepatitis B virus genome in the place of the polymerase, surface, and pre-surface coding sequences. It was cotransfected with wild-type virus into an avian hepatoma cell line. Culture media containing high titers of the recombinant virus were used to infect primary duckling hepatocytes. Stable CAT gene expression was detected for at least 24 days after h-ansfection (Chang et al., 1991).
In yet another aspect, non-viral vectors may be used according to the presently disclosed methods.
Several non-viral methods for the transfer of expression vectors into cultured mammalian cells also are contemplated by the present invention. These include calcium phosphate precipitation (Graham and Van Der Eb, 1973; Chen and Okayama, 1987; Rippe et al., 1990) DEAE-dextran (Gopal, 1985), electroporation (Tur-Kaspa et al., 1986; Potter et al., 1984), direct microinjection (Harland and Weintraub, 1985); DNA-loaded liposomes (Nicolau and Sene, 1982; Fraley et al., 1979) and lipofectamine-DNA
complexes, cell sonication (Fechheimer et al., 1987), gene bombardment using high velocity microprojectiles (Yang et al., 1990), polycations (Boussif et al., 1995) and receptor-mediated transfection (Wu and Wu, 1987; Wu and Wu, 1988). Some of these techniques may be successfully adapted for in vivo or ex vivo use.
In one embodiment of the invention, the expression construct may simply consist of naked recombinant vector. Transfer of the construct may be performed by any of the methods mentioned above S which physically or chemically permeabilize the cell membrane. For example, Dubensky et al. ( 1984) successfully injected polyomavirus DNA in the form of CaP04 precipitates into liver and spleen of adult and newborn mice demonstrating active viral replication and acute infection.
Benvenisty and Neshif (1986) also demonstrated that direct intraperitoneal injection of CaP04 precipitated plasmids results in expression of the transfected genes. It is envisioned that DNA encoding an Grb2 or Crkl construct may also be transferred in a similar manner in vivo.
Another embodiment of the invention for transferring a naked DNA expression vector into cells may involve particle bombardment. This method depends on the ability to accelerate DNA coated microprojectiles to a high velocity allowing them to pierce cell membranes and enter cells without killing them (Klein et al., 1987). Several devices for accelerating small particles have been developed. One such 1 S device relies on a high voltage discharge to generate an electrical current, which in turn provides the motive force (Yang et al., 1990). The microprojectiles used have consisted of biologically inert substances such as tungsten or gold beads.
Selected organs including the liver, skin, and muscle tissue of rats and mice have been bombarded in vivo (Yang et al., 1990; Zelenin et al., 1991). This may require surgical exposure of the tissue or cells, to eliminate any intervening tissue between the gun and the target organ. DNA
encoding a Crrb2 or Crkl construct may be delivered via this method.
Alternatively, the degree of cellular efflux in a cell may be influenced by administering a compound identified via one of the assays described above, that increases or decreases the rate of cellular efflux or development of MDR phenotype.
2S D. FORMULATION AND ADMINISTRATION OF THE DISCLOSED COMPOSITIONS
The formulations described herein may be prepared in water suitably mixed with a surfactant, such as hydroxypropylcellulose or polyoxyethylenesorbitans. In many cases, it will be preferable to include isotonic agents, for example, sugars or sodium chloride as described above. Prolonged absorption of the injectable compositions can be brought about by the use in the compositions of agents delaying absorption, for example, aluminum monostearate or gelatin.
Other agents that may be employed include, but are not limited to lecithin, urea, ethylene oxide, propylene oxide, hydroxypropylcellulose, methylcellulose, or polyethylene glycol.
Aqueous compositions (inocula) as described herein may include an effective amount of a desired pharmacologically active agent dissolved or dispersed in a pharmaceutically acceptable 3S aqueous medium. Such compositions are also referred to as inocula. The use ofpharmaceutically acceptable carrier media and agents for pharmaceutically active substances is well known in the art.
Except insofar as any conventional media or agent is incompatible with the active ingredient, its use in the therapeutic compositions is contemplated. Supplementary active ingredients also can be incorporated into the compositions as described above.
A semaphorin used in the present invention may be formulated into a composition in a neutral or salt form. Pharmaceutically acceptable salts include the acid addition salts (formed with the free amino groups of the protein) and those that are formed with inorganic acids such as, for example, hydrochloric or phosphoric acids, or such organic acids as acetic, oxalic, tartaric, mandelic, and the like. Salts formed with the free carboxyl groups can also be derived from inorganic bases such as, for example, sodium, potassium, ammonium, calcium, or fernc hydroxides, and such organic bases as isopropylamine, trimethylamine, histidine, procaine and the like.
Such compositions of the present invention can be, alternatively, complexed with polyethylene glycol (PEG), metal ions, or incorporated into polymeric compounds such as polyacetic acid, polyglycolic acid, hydrogels, dextran, etc. or incorporated into liposomes, microemulsions, micelles, 1 S unilamellar or multilamellar vesicles, erythrocyte ghosts or sphereoblasts. Such compositions will influence the physical state, solubility, stability, rate of in vivo release, and rate of in vivo clearance, and are thus chosen according to the intended application.
The therapeutic compositions of the present invention are advantageously administered in the form of injectable compositions either as liquid solutions or suspensions;
solid forms suitable for solution in, or suspension in, liquid prior to injection may also be prepared.
Alternatively, the compositions of the present invention may be administered as inhalants in an aerosolized form.
Depending upon the needs of the formulator, administrator, or the subject of the treatment, the presently disclosed compositions may take virtually any form including liquid, suspension, aerosol, emulsion, solution, oil, mixture, cream, ointment, gel, suppository, semi-solid, aerosol, powder, lyophilized form that may be reconstituted when appropriate, tablet, capsule or any other form or state convenient for administration to treat the described disorders. A typical composition comprises a pharmaceutically acceptable carrier.
The presently disclosed compositions and methods may utilize both oral and non-oral administration routes to influence the target cell or cells including, for example, by injection via the intradermal, subcutaneous, and intravenous routes; by transdermal delivery; by inhalation or buccal delivery, or by ingestion of tablets or capsules. For example, local or regional delivery of compounds to a cell or cells can be by injection into the tissue, injection into the vasculature or lymphatics to effect regional infusion, inhalation, or regional perfusion by use of an extracorporeal circuit.
Administration in a targeted fashion is useful to, for example, more effectively eliminate neoplastic cells, while minimizing the adverse effects of chemotherapy on healthy cells.
For example, an inhibitor of cellular efflux can be directly administered, according to the methods disclosed herein, to neoplastic cells such as tumor cells, to prevent their development of MDR and thereby promote their susceptibility to chemotherapeutic or otherwise cytotoxic agents, while simultaneously administering to healthy cells a promoter of cellular-efflux to prevent their destruction by cytotoxic agents.
The optimal daily dose of semaphorin, semaphorin receptor such as VESPR or soluble VESPR, or of an agonist or antagonist of one of these, alone or in combination, useful for the purposes of the present invention is determined by methods known in the art. For example, dosages can be determined based on the severity of the disease or condition being treated, the condition of the subject to whom treatment is being given, the desired degree of therapeutic response, and any concomitant therapies being administered to the subject. Ordinarily, however, administration will be such that a serum level of between about 100ng/ml to about 1 OOpg/ml of semaphorin, semaphorin receptor, or agonist or antagonist of either, is achieved. Preferred doses will achieve blood serum levels of between SOOng/ml and 1 ug/ml. The dose can be administered in a single or multiple dosage regimen, or may be by a method that allows for a continuous release of relatively small amounts of the active ingredient from a single dosage unit, such as by a transdermal patch or ingested extended release capsule, over the course of one or more days.
To determine when inhibition or retardation of the various target diseases or conditions, or when amelioration, regression or destruction of the targeted diseases or conditions has been achieved, any of the following can be considered: improvement in patient condition or quality of life; increased longevity of life; decreased pain; decreased severity of symptoms of the targeted disease or condition;
retardation of abnormal tissue growth or metastases such as in the case of suppression of development of MDR in cells being targeted for cancer chemotherapeutic disease; an increase in desired tissue growth or viability in the case or promotion of drug resistance in healthy tissue and cells; and the like.
Any of these endpoints as well as others may be considered to determine the effectiveness of the therapy, and may be measured or determined by patient self evaluation;
objective screening; or by diagnostic testing such as by X-ray, CT or PET scanning or the like.
The compositions as described herein may be formulated so that they are contained in a vial, bottle, tube, syringe inhaler or other container for single or multiple administrations. Such containers may be made of glass or a polymer material such as polypropylene, polyethylene, or polyvinylchloride, for example. Preferred containers may include a seal, or other closure system, such as a rubber stopper that may be penetrated by a needle in order to withdraw a single dose and then re-seal upon removal of the needle. All such containers for injectable liquids, lyophilized formulations, reconstituted lyophilized formulations or reconstitutable powders for injection known in the art or for the administration of aerosolized compositions are contemplated for use in the presently disclosed compositions and methods.
In alternative embodiments, the presently disclosed compositions are administered in conjunction, either simultaneously or sequentially, with additional active agents such as an immunosuppressant, cell sensitizer, or other chemotherapeutic agent including a cancer chemotherapeutic agent. Exemplary agents to be used in combination with the presently disclosed compositions include cyclosporin, tamoxifen, FK506, taxotere, doxorubicin, cis-platin, I-phosphamide, or methotrexate.
REFERENCES
Altan, et al., J. Exp. Med. 187:1583 Altan, et al., PNAS 96:4432 Chen, et al., JBC 274:18364 Kim et al., Blood, 91:4106-4117 (1998) Lelong, et al., Molecular Pharmacology 40:490 (1991).
Schindler, et al., Biochemistry 35:2811 Weisburg et al, J. Biol Chem, 274, 10877-88 (1999) Yamada et.al., PNAS 94:14713-14718 (1997) Zaman, G.J.R. et.al., PNAS USA 91:8822 (1994) INFORMATION FOR SEQ ID NO:1:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 4707 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA
(iii) HYPOTHETICAL: NO
(iv) ANTI-SENSE: NO
(ix) FEATURE:
(A) NAME/KEY: CDS
(B) LOCATION: 1..4707 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:1:
Met Glu Val Ser Arg Arg Lys Ala Pro Pro Arg Pro Pro Arg Pro Ala Ala Pro Leu Pro Leu Leu Ala Tyr Leu Leu Ala Leu Ala Ala Pro Gly Arg Gly Ala Asp Glu Pro Val Trp Arg Ser Glu Gln Ala Ile Gly Ala Ile Ala Ala Ser Gln Glu Asp Gly Val Phe Val Ala Ser Gly Ser Cys Leu Asp Gln Leu Asp Tyr Ser Leu Glu His Ser Leu Ser Arg Leu Tyr Arg Asp Gln Ala Gly Asn Cys Thr Glu Pro Val Ser Leu Ala Pro Pro Ala Arg Pro Arg Pro Gly Ser Ser Phe Ser Lys Leu Leu Leu Pro Tyr Arg Glu Gly Ala Ala Gly Leu Gly Gly Leu Leu Leu Thr Gly Trp Thr Phe Asp Arg Gly Ala Cys Glu Val Arg Pro Leu Gly Asn Leu Ser Arg CAG GGC
Asn Ser Leu Arg Asn Gly Thr Glu Val Val Ser Cys His Pro Gln Gly TGG TAC
Ser Thr Ala Gly Val Val Tyr Arg Ala Gly Arg Asn Asn Arg Trp Tyr GCG AGC
Leu Ala Val Ala Ala Thr Tyr Val Leu Pro Glu Pro Glu Thr Ala Ser CTC AAG
Arg Cys Asn Pro Ala Ala Ser Asp His Asp Thr Ala Ile Ala Leu Lys CTC AAG
Asp Thr Glu Gly Arg Ser Leu Ala Thr Gln Glu Leu Gly Arg Leu Lys CTC TGG
Leu Cys Glu Gly Ala Gly Ser Leu His Phe Val Asp Ala Phe Leu Trp AGC GGC
Asn Gly Ser Ile Tyr Phe Pro Tyr Tyr Pro Tyr Asn Tyr Thr Ser Gly ACC GAG
Ala Ala Thr Gly Trp Pro Ser Met Ala Arg Ile Ala Gln Ser Thr Glu CAC CCC
Val Leu Phe Gln Gly Gln Ala Ser Leu Asp Cys Gly His Gly His Pro CTG GAC
Asp Gly Arg Arg Leu Leu Leu Ser Ser Ser Leu Val Glu Ala Leu Asp GAG CGG
Val Trp Ala Gly Val Phe Ser Ala Ala Ala Gly Glu Gly Gln Glu Arg GAG ATC
Arg Ser Pro Thr Thr Thr Ala Leu Cys Leu Phe Arg Met Ser Glu Ile GAG AGC
Gln Ala Arg Ala Lys Arg Val Ser Trp Asp Phe Lys Thr Ala Glu Ser GAA AGA
GTC
CAA
CCA
ATC
GCA
TCA
HisCys LysGluGly AspGlnPro GluArgVal GlnPro Ile Ser Ala GTG
SerThr LeuIleHis SerAspLeu ThrSerVal TyrGly Thr Val Val MetAsn ArgThrVal LeuPheLeu GlyThrGly AspGly GlnLeuLeu LysVal IleLeuGly GluAsnLeu ThrSerAsn CysPro GluValIle TyrGlu IleLysGlu GluThrPro ValPheTyr LysLeu ValProAsp ProVal LysAsnIle TyrIleTyr LeuThrAla GlyLys GluValArg ArgIle ArgValAla AsnCysAsn LysHisLys SerCys SerGluCys LeuThr AlaThrAsp ProHisCys GlyTrpCys HisSer LeuGlnArg CysThr PheGlnGly AspCysVal HisSerGlu AsnLeu GluAsnTrp LeuAsp IleSerSer GlyAlaLys LysCysPro LysIle GlnIleIle ArgSer SerLysGlu LysThrThr ValThrMet ValGly SerPheSer ProArg HisSerLys CysMetVal LysAsnVal AspSer SerArgGlu LeuCys GlnAsnLys SerGlnPro AsnArgThr CysThr CysSerIle ProThr ArgAlaThr TyrLysAsp ValSerVal ValAsn ValMetPhe TTC
GGT
TCT
TGG
AAT
TTA
TCA
GAC
AGA
TTC
AAC
TTT
ACC
AAC
TGC
Ser Ser Asp Arg Asn Cys Phe Trp Phe Asn Gly Asn Phe Thr Leu Ser TCA GCA GAA ACT
TTA GGC TGC
AAA
GAA
TGC
Ser Leu LysGlu Pro Cys Val Ala Trp Ser Cys Ala Glu Thr Gly Cys AAA AGG ATC TTC TGC
Cys LysSer AlaArg Cys His Pro Thr Ala Asp Pro Arg Ile Phe Cys AAC GAA CCA GTC
Ser AspTyr GluArg Gln Gln Cys Val Ala Glu Lys Asn Glu Pro Val AGA AAG AAG AGA
Thr SerGly GlyGly Pro Glu Asn Gly Asn Thr Asn Arg Lys Lys Arg TTC ATT ATT CAG
Gln AlaLeu GlnVal Tyr Lys Ser Glu Pro Lys Val Phe Ile Ile Gln AGC GTG ACG AAC
Ser ThrLeu GlyLys Asn Ile Val Gly Ala Phe Thr Ser Val Thr Asn ACA ATC GGA ACC
Arg AlaSer AsnIle Met Leu Lys Thr Ser Cys Asp Thr Ile Gly Thr GTT CAT AAT CAC
Lys AspVal IleGln Ser Val Leu Asp Thr Met Lys Val His Asn His AGC AAA AAG TGT
Phe SerLeu ProSer Arg Glu Met Asp Val Ile Gln Ser Lys Lys Cys TGC TCT TCC TAC
Phe AspGly GlyAsn Ser Val Gly Leu Ser Ile Ala Cys Ser Ser Tyr 740 745 75p CTT TTT ACC ATC AGT
GGT
Leu ProHis CysSer Ile Pro Ala Thr Trp Ser Gly Leu Phe Thr Ile AAT ATG GGC ATT GAC
ATA AGA AAC
AAT
TTT
Gly GlnAsn IleThr Met Asp Val Met Gly Ile Asp Arg Asn Asn Phe ATT GAA
TCA TTA
AAA
GGA
AAC
ATA
AAT
GTC
TCT
GAA
TAT
Leu IleIle Leu Ser Lys His Gly Glu Asn Ile Asn Val Ser Glu Tyr Cys Val Ala Thr Tyr Cys Gly Phe Leu Ala Pro Ser Leu Lys Ser Ser Lys Val Arg Thr Asn Val Thr Val Lys Leu Arg Val Gln Asp Thr Tyr Leu Asp Cys Gly Thr Leu Gln Tyr Arg Glu Asp Pro Arg Phe Thr Gly Tyr Arg Val Glu Ser Glu Val Asp Thr Glu Leu Glu Val Lys Ile Gln Lys Glu Asn Asp Asn Phe Asn Ile Ser Lys Lys Asp Ile Glu Ile Thr Leu Phe His Gly Glu Asn Gly Gln Leu Asn Cys Ser Phe Glu Asn Ile Thr Arg Asn Gln Asp Leu Thr Thr Ile Leu Cys Lys Ile Lys Gly Ile Lys Thr Ala Ser Thr Ile Ala Asn Ser Ser Lys Lys Val Arg Val Lys Leu Gly Asn Leu Glu Leu Tyr Val Glu Gln Glu Ser Val Pro Ser Thr TrpTyrPheLeu IleVal LeuPro ValLeuLeuVal IleValIle Phe AlaAlaValGly ValThr ArgHis LysSerLysGlu LeuSerArg Lys GlnSerGlnGln LeuGlu LeuLeu GluSerGluLeu ArgLysGlu Ile ArgAspGlyPhe AlaGlu LeuGln MetAspLysLeu AspValVal Asp Ser Phe Gly Thr Val Pro Phe Leu Asp Tyr Lys His Phe Ala Leu Arg TCA
ThrPhe Phe ProGlu Gly GlyPhe ThrHisIlePhe ThrGlu Asp Ser GCC
MetHis Asn ArgAsp Asn AspLys AsnGluSerLeu ThrAla Leu Ala AAT
AspAla Leu IleCys Lys SerPhe LeuValThrVal IleHis Thr Asn AAC
LeuGlu Lys GlnLys Phe SerVal LysAspArgCys LeuPhe Ala Asn Ser Phe Leu Thr Ile Ala Leu Gln Thr Lys Leu Val Tyr Leu Thr Ser Ile Leu Glu Val Leu Thr Arg Asp Leu Met Glu Gln Cys Ser Asn Met Gln Pro Lys Leu Met Leu Arg Arg Thr Glu Ser Val Val Glu Lys Leu Leu Thr Asn Trp Met Ser Val Cys Leu Ser Gly Phe Leu Arg Glu Thr Val Gly Glu Pro Phe Tyr Leu Leu Val Thr Thr Leu Asn Gln Lys Ile Asn Lys Gly Pro Val Asp Val Ile Thr Cys Lys Ala Leu Tyr Thr Leu Asn Glu Asp Trp Leu Leu Trp Gln Val Pro Glu Phe Ser Thr Val Ala Leu Asn Val Val Phe Glu Lys Ile Pro Glu Asn Glu Ser Ala Asp Val Cys Arg Asn Ile Ser Val Asn Val Leu Asp Cys Asp Thr Ile Gly Gln Ala Lys Glu Lys Ile Phe Gln Ala Phe Leu Ser Lys Asn Gly Ser Pro Tyr Gly Leu Gln Leu Asn Glu Ile Gly Leu Glu Leu Gln Met Gly Thr Arg Gln Lys Glu Leu Leu Asp Ile Asp Ser Ser Ser Val Ile Leu Glu Asp Gly Ile Thr Lys Leu Asn Thr Ile Gly His Tyr Glu Ile Ser Asn Gly Ser Thr Ile Lys Val Phe Lys Lys Ile Ala Asn Phe Thr Ser Asp Val Glu Tyr Ser Asp Asp His Cys His Leu Ile Leu Pro Asp Ser Glu Ala Phe Gln Asp Val Gln Gly Lys Arg His Arg Gly Lys His Lys Phe Lys Val Lys Glu Met Tyr Leu Thr Lys Leu Leu Ser Thr Lys Val Ala Ile His Ser Val Leu Glu Lys Leu Phe Arg Ser Ile Trp Ser Leu Pro Asn Ser Arg Ala Pro Phe Ala Ile Lys Tyr Phe Phe Asp Phe Leu Asp Ala Gln Ala Glu Asn Lys Lys Ile Thr Asp Pro Asp Val Val His Ile Trp Lys Thr Asn Ser Leu Pro Leu Arg Phe Trp Val Asn Ile Leu Lys Asn Pro Gln Phe Val Phe Asp Ile Lys Lys Thr Pro His Ile Asp Gly Cys Leu Ser Val Ile Ala Gln Ala Phe Met Asp Ala Phe Ser Leu Thr ACT
GluGlnGln LeuGly LysGluAla ProThrAsn LysLeuLeu TyrAla LysAspIle ProThr TyrLysGlu GluValLys SerTyrTyr LysAla IleArgAsp LeuPro ProLeuSer SerSerGlu MetGluGlu PheLeu ThrGlnGlu SerLys LysHisGlu AsnGluPhe AsnGluGlu ValAla LeuThrGlu IleTyr LysTyrIle ValLysTyr PheAspGlu IleLeu AsnLysLeu GluArg GluArgGly LeuGluGlu AlaGlnLys GlnLeu LeuHisVal LysVal LeuPheAsp GluLysLys LysCysLys TrpMet TAA
INFORMATION FOR SEQ ID N0:2:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 1569 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID N0:2:
Met Glu Val Ser Arg Arg Lys Ala Pro Pro Arg Pro Pro Arg Pro Ala Ala Pro Leu Pro Leu Leu Ala Tyr Leu Leu Ala Leu Ala Ala Pro Gly Arg Gly Ala Asp Glu Pro Val Trp Arg Ser Glu Gln Ala Ile Gly Ala Ile Ala Ala Ser Gln Glu Asp Gly Val Phe Val Ala Ser Gly Ser Cys Leu Asp Gln Leu Asp Tyr Ser Leu Glu His Ser Leu Ser Arg Leu Tyr 65 70 75 gp Arg Asp Gln Ala Gly Asn Cys Thr Glu Pro Val Ser Leu Ala Pro Pro Ala Arg Pro Arg Pro Gly Ser Ser Phe Ser Lys Leu Leu Leu Pro Tyr Arg Glu Gly Ala Ala Gly Leu Gly Gly Leu Leu Leu Thr Gly Trp Thr Phe Asp Arg Gly Ala Cys Glu Val Arg Pro Leu Gly Asn Leu Ser Arg Asn Ser Leu Arg Asn Gly Thr Glu Val Val Ser Cys His Pro Gln Gly Ser Thr Ala Gly Val Val Tyr Arg Ala Gly Arg Asn Asn Arg Trp Tyr Leu Ala Val Ala Ala Thr Tyr Val Leu Pro Glu Pro Glu Thr Ala Ser Arg Cys Asn Pro Ala Ala Ser Asp His Asp Thr Ala Ile Ala Leu Lys Asp Thr Glu Gly Arg Ser Leu Ala Thr Gln Glu Leu Gly Arg Leu Lys Leu Cys Glu Gly Ala Gly Ser Leu His Phe Val Asp Ala Phe Leu Trp Asn Gly Ser Ile Tyr Phe Pro Tyr Tyr Pro Tyr Asn Tyr Thr Ser Gly Ala Ala Thr Gly Trp Pro Ser Met Ala Arg Ile Ala Gln Ser Thr Glu Val Leu Phe Gln Gly Gln Ala Ser Leu Asp Cys Gly His Gly His Pro Asp Gly Arg Arg Leu Leu Leu Ser Ser Ser Leu Val Glu Ala Leu Asp Val Trp Ala Gly Val Phe Ser Ala Ala Ala Gly Glu Gly Gln Glu Arg Arg Ser Pro Thr Thr Thr Ala Leu Cys Leu Phe Arg Met Ser Glu Ile Gln Ala Arg Ala Lys Arg Val Ser Trp Asp Phe Lys Thr Ala Glu Ser His Cys Lys Glu Gly Asp Gln Pro Glu Arg Val Gln Pro Ile Ala Ser Ser Thr Leu Ile His Ser Asp Leu Thr Ser Val Tyr Gly Thr Val Val Met Asn Arg Thr Val Leu Phe Leu Gly Thr Gly Asp Gly Gln Leu Leu Lys Val Ile Leu Gly Glu Asn Leu Thr Ser Asn Cys Pro Glu Val Ile Tyr Glu Ile Lys Glu Glu Thr Pro Val Phe Tyr Lys Leu Val Pro Asp Pro Val Lys Asn Ile Tyr Ile Tyr Leu Thr Ala Gly Lys Glu Val Arg Arg Ile Arg Val Ala Asn Cys Asn Lys His Lys Ser Cys Ser Glu Cys Leu Thr Ala Thr Asp Pro His Cys Gly Trp Cys His Ser Leu Gln Arg Cys Thr Phe Gln Gly Asp Cys Val His Ser Glu Asn Leu Glu Asn Trp Leu Asp Ile Ser Ser Gly Ala Lys Lys Cys Pro Lys Ile Gln Ile Ile Arg Ser Ser Lys Glu Lys Thr Thr Val Thr Met Val Gly Ser Phe Ser Pro Arg His Ser Lys Cys Met Val Lys Asn Val Asp Ser Ser Arg Glu Leu Cys Gln Asn Lys Ser Gln Pro Asn Arg Thr Cys Thr Cys Ser Ile Pro Thr Arg Ala Thr Tyr Lys Asp Val Ser Val Val Asn Val Met Phe Ser Phe Gly Ser Trp Asn Leu Ser Asp Arg Phe Asn Phe Thr Asn Cys Ser Ser Leu Lys Glu Cys Pro Ala Cys Val Glu Thr Gly Cys Ala Trp Cys Lys Ser Ala Arg Arg Cys Ile His Pro Phe Thr Ala Cys Asp Pro Ser Asp Tyr Glu Arg Asn Gln Glu Gln Cys Pro Val Ala Val Glu Lys Thr Ser Gly Gly Gly Arg Pro Lys Glu Asn Lys Gly Asn Arg Thr Asn Gln Ala Leu Gln Val Phe Tyr Ile Lys Ser Ile Glu Pro Gln Lys Val Ser Thr Leu Gly Lys Ser Asn Val Ile Val Thr Gly Ala Asn Phe Thr Arg Ala Ser Asn Ile Thr Met Ile Leu Lys Gly Thr Ser Thr Cys Asp Lys Asp Val Ile Gln Val Ser His Val Leu Asn Asp Thr His Met Lys Phe Ser Leu Pro Ser Ser Arg Lys Glu Met Lys Asp Val Cys Ile Gln Phe Asp Gly Gly Asn Cys Ser Ser Val Gly Ser Leu Ser Tyr Ile Ala Leu Pro His Cys Ser Leu Ile Phe Pro Ala Thr Thr Trp Ile Ser Gly Gly Gln Asn Ile Thr Met Met Gly Arg Asn Phe Asp Val Ile Asp Asn Leu Ile Ile Ser His Glu Leu Lys Gly Asn Ile Asn Val Ser Glu Tyr Cys Val Ala Thr Tyr Cys Gly Phe Leu Ala Pro Ser Leu Lys Ser Ser Lys Val Arg Thr Asn Val Thr Val Lys Leu Arg Val Gln Asp Thr Tyr Leu Asp Cys Gly Thr Leu Gln Tyr Arg Glu Asp Pro Arg Phe Thr Gly Tyr Arg Val Glu Ser Glu Val Asp Thr Glu Leu Glu Val Lys Ile Gln Lys Glu Asn Asp Asn Phe Asn Ile Ser Lys Lys Asp Ile Glu Ile Thr Leu Phe His Gly Glu Asn Gly Gln Leu Asn Cys Ser Phe Glu Asn Ile Thr Arg Asn Gln Asp Leu Thr Thr Ile Leu Cys Lys Ile Lys Gly Ile Lys Thr Ala Ser Thr Ile Ala Asn Ser Ser Lys Lys Val Arg Val Lys Leu Gly Asn Leu Glu Leu Tyr Val Glu Gln Glu Ser Val Pro Ser Thr Trp Tyr Phe Leu Ile Val Leu Pro Val Leu Leu Val Ile Val Ile Phe Ala Ala Val Gly Val Thr Arg His Lys Ser Lys Glu Leu Ser Arg Lys Gln Ser Gln Gln Leu Glu Leu Leu Glu Ser Glu Leu Arg Lys Glu Ile Arg Asp Gly Phe Ala Glu Leu Gln Met Asp Lys Leu Asp Val Val Asp Ser Phe Gly Thr Val Pro Phe Leu Asp Tyr Lys His Phe Ala Leu Arg Thr Phe Phe Pro Glu Ser Gly Gly Phe Thr His Ile Phe Thr Glu Asp Met His Asn Arg Asp Ala Asn Asp Lys Asn Glu Ser Leu Thr Ala Leu Asp Ala Leu Ile Cys Asn Lys Ser Phe Leu Val Thr Val Ile His Thr Leu Glu Lys Gln Lys Asn Phe Ser Val Lys Asp Arg Cys Leu Phe Ala Ser Phe Leu Thr Ile Ala Leu Gln Thr Lys Leu Val Tyr Leu Thr Ser Ile Leu Glu Val Leu Thr Arg Asp Leu Met Glu Gln Cys Ser Asn Met Gln Pro Lys Leu Met Leu Arg Arg Thr Glu Ser Val Val Glu Lys Leu Leu Thr Asn Trp Met Ser Val Cys Leu Ser Gly Phe Leu Arg Glu Thr Val Gly Glu Pro Phe Tyr Leu Leu Val Thr Thr Leu Asn Gln Lys Ile Asn Lys Gly Pro Val Asp Val Ile Thr Cys Lys Ala Leu Tyr Thr Leu Asn Glu Asp Trp Leu Leu Trp Gln Val Pro Glu Phe Ser Thr Val Ala Leu Asn Val Val Phe Glu Lys Ile Pro Glu Asn Glu Ser Ala Asp Val Cys Arg Asn Ile Ser Val Asn Val Leu Asp Cys Asp Thr Ile Gly Gln Ala Lys Glu Lys Ile Phe Gln Ala Phe Leu Ser Lys Asn Gly Ser Pro Tyr Gly Leu Gln Leu Asn Glu Ile Gly Leu Glu Leu Gln Met Gly Thr Arg Gln Lys Glu Leu Leu Asp Ile Asp Ser Ser Ser Val Ile Leu Glu Asp Gly Ile Thr Lys Leu Asn Thr Ile Gly His Tyr Glu Ile Ser Asn Gly Ser Thr Ile Lys Val Phe Lys Lys Ile Ala Asn Phe Thr Ser Asp Val Glu Tyr Ser Asp Asp His Cys His Leu Ile Leu Pro Asp Ser Glu Ala Phe Gln Asp Val Gln Gly Lys Arg His Arg Gly Lys His Lys Phe Lys Val Lys Glu Met Tyr Leu Thr Lys Leu Leu Ser Thr Lys Val Ala Ile His Ser Val Leu Glu Lys Leu Phe Arg Ser Ile Trp Ser Leu Pro Asn Ser Arg Ala Pro Phe Ala Ile Lys Tyr Phe Phe Asp Phe Leu Asp Ala Gln Ala Glu Asn Lys Lys Ile Thr Asp Pro Asp Val Val His Ile Trp Lys Thr Asn Ser Leu Pro Leu Arg Phe Trp Val Asn Ile Leu Lys Asn Pro Gln Phe Val Phe Asp Ile Lys Lys Thr Pro His Ile Asp Gly Cys Leu Ser Val Ile Ala Gln Ala Phe Met Asp Ala Phe Ser Leu Thr Glu Gln Gln Leu Gly Lys Glu Ala Pro Thr Asn Lys Leu Leu Tyr Ala Lys Asp Ile Pro Thr Tyr Lys Glu Glu Val Lys Ser Tyr Tyr Lys Ala Ile Arg Asp Leu Pro Pro Leu Ser Ser Ser Glu Met Glu Glu Phe Leu Thr Gln Glu Ser Lys Lys His Glu Asn Glu Phe Asn Glu Glu Val Ala Leu Thr Glu Ile Tyr Lys Tyr Ile Val Lys Tyr Phe Asp Glu Ile Leu Asn Lys Leu Glu Arg Glu Arg Gly Leu Glu Glu Ala Gln Lys Gln Leu Leu His Val Lys Val Leu Phe Asp Glu Lys Lys Lys Cys Lys Trp Met
Claims (25)
-
- 2. A method of modulating cellular efflux comprising contacting a cell with an agent selected from the group consisting of:
(a) a semaphorin polypeptide;
(b) a semaphorin receptor polypeptide;
(c) a polynucleotide encoding a semaphorin polypeptide;
(d) a polynucleotide encoding a semaphorin raptor polypeptide;
(e) an agonist of a semaphorin polypeptide or semaphorin receptor polypeptide;
and (f) an antagonist of a semaphorin polypeptide or semaphorin receptor polypeptide;
wherein contact with said agent is effective to activate or inhibit cellular efflux in said cell. - 3. The method of claim 2, wherein said semaphorin polypeptide is A39R, DCSema, CD100, Sema III, or Sema E.
- 4. The method of claim 2, wherein said semaphorin receptor polypeptide comprises the amino acid sequence of SEQ ID NO:2.
- 5. The method of claim 2, wherein said polynucleotide encoding said semaphorin receptor polypeptide comprises the nucleic acid sequence of SEQ ID NO:1.
- 6. The method of claim 2, wherein said agonist or antagonist is an antibody, an antigen, or a small molecule.
- 7. The method of claim 6, wherein said antibody is an antibody to VESPR.
- 8. The method of claim 2, wherein said agent is administers in conjunction with a cytotoxic or sensitizing agent.
- 9. The method of claim 8, wherein said cytotoxic or sensitizing agent is tamoxifen, cisplatin, doxorubicin, radiation, methotrexate, cyclosporin, taxotere, FK506, or i-phosphamide.
- 10. A method of influencing multiple drug resistance in a cell comprising contacting said cell with an agent selected from the group consisting of:
(a) a semsphorin polypeptide;
(b) a semaphorin receptor polypeptide;
(c) a polynucleotide encoding a semaphorin polypeptide;
(d) a polynucleotide encoding a semaphorin receptor polypeptide;
(e) an agonist of a semaphorin polypeptide or semaphorin receptor polypeptide;
and (f) an antagonist of a semaphorin polypeptide or semaphorin receptor polypeptide;
wherein contact with said agent is effective to promote or suppress development of multiple drug resistance in said cell. - 11. A method of treating a cellular-efflux-related disease or condition in a subject comprising administering to said subject a pharmaceutical composition comprising an agent selected from the group consisting of:
(a) a semaphorin polypeptide;
(b) a semaphorin receptor polypeptide;
(c) a polynucleotide encoding s semaphorin polypeptide;
(d) a polynucleotide encoding a semaphorin receptor polypeptide;
(e) an agonist of a semaphorin polypeptide or semaphorin receptor polypeptide;
and (f) an antagonist of a semaphorin polypeptide or semaphorin receptor polypeptide;
wherein administration of said pharmaceutical composition to said subject is effective to ameliorate, in whole or in part, said cellular-efflux-related disease or condition. - 12. The method of claim 11, wherein said agent is further administered in conjunction with a cytotoxic or sensitizing agent.
- 13. The method of claim 12, wherein said cytotoxic or sensitizing agent is tamoxifen, cisplatin, doxorubicin, radiation, methotrexate, cyclosporin, taxotere, FK506, or i-phosphamide.
- 14. The method of claim 11, wherein said cellular-efflux-related disease or condition is multiple drug resistance; a neoplastic disease; cystic fibrosis; or an immunodeficiency disorder.
- 15. A method of detecting the ability of a test compound to effect the MDR
phenotype of a cell, said method comprising:
- contacting a first cell with a test compound and either a semaphorin or semaphorin receptor, in the presence of a cytotoxic or sensitizing agent;
- measuring the rate of death of said first cell;
- observing the rate of death of a control cell under similar conditions but in the absence of said test compound;
- comparing said rate of death of said first cell to the rate of death of said control cell;
wherein a difference in the rate of death of said first cell relative to said control cell is indicative of an effector of MDR phenotype. - 16. The method of claim 15, wherein said cytotoxic or sensitizing agent is tamoxifen, cisplatin, doxorubicin, radiation, methotrexate, cyclosporin, taxotere, FK506, or i-phosphamide.
- 17. The method of claim 15, wherein said test compound is A39R, DCSema, CD100, Sema III, or Sema E. or an antibody to VESPR.
- 18. A method of detecting the ability of a test compound to effect the MDR
phenotype of a cell by modulating cellular efflux in said cell, said method comprising:
- contacting a first cell with a test compound and either a semaphorin or semaphorin receptor, said first cell in the presence of a dye;
- measuring the net rate of influx of dye into said first cell;
- observing the net rate of influx of dye into a control cell under similar conditions, but in the absence of said test compound;
- comparing said net rate influx of dye into said first cell to said net rate of influx of dye into said control cell;
wherein a difference in the net rate of influx of dye into said first cell relative to said control cell is indicative of an effector of cellular efflux. - 19. The method of claim 18, wherein said test compound is A39R, DCSema, CD100, Sema III, or Sema E. or an antibody to VESPR.
- 20. The method of claim 18, wherein said dye is characterized by one or more of the following properties: lipophilic, cationic, fluorescent, and radioactive.
- 21. The method of claim 18, wherein said dye is a slow dye, a fast dye, acridine orange, BODIPY ceramide, SNARF-dextran, FITC-transferrin or BODIPY-transferrin.
- 22. A pharmaceutical composition, for the promotion or inhibition of development of multiple drug resistant phenotype cells comprising:
an amount of a semaphorin, semaphorin receptor, or as agonist or antagonist of a semaphorin or semaphorin receptor, such that administration of said composition is effective to promote or inhibit development of multiple drug resistance. - 23. A pharmaceutical composition, for the treatment of cellular efflux-related disease or condition, comprising:
an amount of a semaphorin, semaphorin receptor, or an agonist or antagonist of a semaphorin or semaphorin receptor, such that administration of said composition is effective to ameliorate, in whole or in part, said cellular-efflux-related disease or condition. - 24. The pharmaceutical composition of claim 23, wherein said agonist or antagonist is an antibody, an antigen, or a small molecule.
- 25. The pharmaceutical composition of claim 23, wherein said cellular-efflux-related disease or condition is multiple drug resistance; a neoplastic disease; cystic fibrosis; or an immunodeficiency disorder.
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15291499P | 1999-09-08 | 1999-09-08 | |
US60/152,914 | 1999-09-08 | ||
US15625799P | 1999-09-27 | 1999-09-27 | |
US60/156,257 | 1999-09-27 | ||
US17390699P | 1999-12-29 | 1999-12-29 | |
US60/173,906 | 1999-12-29 | ||
PCT/US2000/024560 WO2001018044A2 (en) | 1999-09-08 | 2000-09-07 | Use of semaphorin for modulation of cellular efflux |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2384104A1 true CA2384104A1 (en) | 2001-03-15 |
Family
ID=27387351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002384104A Abandoned CA2384104A1 (en) | 1999-09-08 | 2000-09-07 | Use of semaphorin for modulation of cellular efflux |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1210368A2 (en) |
AU (1) | AU770157B2 (en) |
CA (1) | CA2384104A1 (en) |
WO (1) | WO2001018044A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1307557A2 (en) | 2000-08-02 | 2003-05-07 | The Johns Hopkins University | Endothelial cell expression patterns |
WO2003035100A1 (en) * | 2001-09-26 | 2003-05-01 | Institut National De La Sante Et De La Recherche Medicale (Inserm) | Neuropilin as a novel therapeutic target for modulation of immune reponses |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5639856A (en) * | 1993-09-13 | 1997-06-17 | The Regents Of The University Of California | Semaphorin gene family |
IT1270831B (en) * | 1993-09-17 | 1997-05-13 | Romano Deghenghi | ORAL EFFERVESCENT PHARMACEUTICAL COMPOSITIONS CONTAINING ESTRON |
CA2307014A1 (en) * | 1997-10-28 | 1999-05-06 | Immunex Corporation | Viral encoded semaphorin protein receptor dna and polypeptides |
WO1999045114A2 (en) * | 1998-03-03 | 1999-09-10 | Zymogenetics, Inc. | Human semaphorin zsmf-7 |
-
2000
- 2000-09-07 CA CA002384104A patent/CA2384104A1/en not_active Abandoned
- 2000-09-07 AU AU73556/00A patent/AU770157B2/en not_active Ceased
- 2000-09-07 WO PCT/US2000/024560 patent/WO2001018044A2/en not_active Application Discontinuation
- 2000-09-07 EP EP00961634A patent/EP1210368A2/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
AU7355600A (en) | 2001-04-10 |
WO2001018044A3 (en) | 2001-10-25 |
WO2001018044A2 (en) | 2001-03-15 |
AU770157B2 (en) | 2004-02-12 |
EP1210368A2 (en) | 2002-06-05 |
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