EP3068419A1 - Methods and pharmaceutical compositions for the treatment of pancreatic cancers - Google Patents
Methods and pharmaceutical compositions for the treatment of pancreatic cancersInfo
- Publication number
- EP3068419A1 EP3068419A1 EP13836207.4A EP13836207A EP3068419A1 EP 3068419 A1 EP3068419 A1 EP 3068419A1 EP 13836207 A EP13836207 A EP 13836207A EP 3068419 A1 EP3068419 A1 EP 3068419A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxir
- agonist
- antibody
- antibodies
- orexin
- 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.)
- Withdrawn
Links
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- FBTUMDXHSRTGRV-ALTNURHMSA-N zorubicin Chemical compound O([C@H]1C[C@@](O)(CC=2C(O)=C3C(=O)C=4C=CC=C(C=4C(=O)C3=C(O)C=21)OC)C(\C)=N\NC(=O)C=1C=CC=CC=1)[C@H]1C[C@H](N)[C@H](O)[C@H](C)O1 FBTUMDXHSRTGRV-ALTNURHMSA-N 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
- A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- A61K38/17—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- A61K38/1703—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- A61K38/1709—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
- A61P1/18—Drugs for disorders of the alimentary tract or the digestive system for pancreatic disorders, e.g. pancreatic enzymes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
Definitions
- the present invention relates to methods and pharmaceutical compositions for the treatment of pancreatic cancers.
- Pancreatic cancer is an aggressive disease associated with an extremely poor prognosis. It is one of the most malignant cancers, characterized insidious onset, usually late diagnosis and low survival rate after diagnosis.
- pancreatic ductal adenocarcinoma PDAC
- PDAC pancreatic ductal adenocarcinoma
- long term survival in PDAC is often limited to patients who have had surgery in early stage of the disease.
- the biological aggressiveness of PDAC is due, in part, to the tumor's resistance to chemotherapy.
- the standard of treatment remains systemic chemotherapy with gemcitabine, with palliative objectives and a disappointing marginal survival advantage.
- the orexins (hypocretins) comprise two neuropeptides produced in the hypothalamus: the orexin A (OX-A) (a 33 amino acid peptide) and the orexin B (OX-B) (a 28 amino acid peptide) (Sakurai T. et al, Cell, 1998, 92, 573-585). Orexins are found to stimulate food consumption in rats suggesting a physiological role for these peptides as mediators in the central feedback mechanism that regulates feeding behaviour. Orexins regulate states of sleep and wakefulness opening potentially novel therapeutic approaches for narcoleptic or insomniac patients. Orexins have also been indicated as playing a role in arousal, reward, learning and memory.
- orexin receptors Two orexin receptors have been cloned and characterized in mammals. They belong to the super family of G-protein coupled receptors (7-transmembrane spanning receptor) (Sakurai T. et al, Cell, 1998, 92, 573-585): the orexin-1 receptor (OXIR or HCTR1) is selective for OX-A and the orexin-2 receptor (OX2R orHCTR2) is capable to bind OX- A as well as OX-B.
- G-protein coupled receptors 7-transmembrane spanning receptor
- OXIR is an Achilles' s heel of colon cancers (even chemoresi stance) and suggests that OXIR agonists might be novel candidates for colon cancer therapy.
- the present invention relates to methods and pharmaceutical compositions for the treatment of pancreatic cancers.
- the present invention relates to an OXIR agonist for use in the treatment of pancreatic cancer in a subject in need thereof.
- the present invention relates to an OXIR agonist for use in the treatment of pancreatic cancer in a subject in need thereof.
- OXIR has its general meaning in the art and refers to the 7- transmembrane spanning receptor OXIR for orexins. According to the invention, OXIR promotes apoptosis in the human prancreatic cancer cell line through a mechanism which is not related to Gq-mediated phopholipase C activation and cellular calcium transients.
- Orexins induce indeed tyrosine phosphorylation of 2 tyrosine-based motifs in OXIR, ITIM and ITSM, resulting in the recruitment of the phosphotyrosine phosphatase SHP-2, the activation of which is responsible for mitochondrial apoptosis (Voisin T, El Firar A, Rouyer-Fessard C, Gratio V, Laburthe M.
- a hallmark of immunoreceptor, the tyrosine-based inhibitory motif ITIM is present in the G protein-coupled receptor OXIR for orexins and drives apoptosis: a novel mechanism.
- OXIR agonist refers to any compound natural or not that is able to bind to OXIR and promotes OXIR activity which consists of activation of signal transduction pathways involving recruitment of SFIP-2 and the induction of apoptosis of the cell, independently of transient calcium release.
- the OXIR agonist is a small organic molecule.
- small organic molecule refers to a molecule of a size comparable to those organic molecules generally used in pharmaceuticals. The term excludes biological macromolecules (e. g., proteins, nucleic acids, etc.). Preferred small organic molecules range in size up to about 5000 Da, more In particular up to 2000 Da, and most In particular up to about 1000 Da.
- the OXIR agonist is an OXIR antibody or a portion thereof.
- antibody includes both naturally occurring and non- naturally occurring antibodies. Specifically, “antibody” includes polyclonal and monoclonal antibodies, and monovalent and divalent fragments thereof. Furthermore, “antibody” includes chimeric antibodies, wholly synthetic antibodies, single chain antibodies, and fragments thereof.
- the antibody may be a human or nonhuman antibody. A nonhuman antibody may be humanized by recombinant methods to reduce its immunogenicity in man.
- the antibody is a monoclonal antibody.
- the antibody is a polyclonal antibody.
- the antibody is a humanized antibody.
- the antibody is a chimeric antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a light chain of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a heavy chain of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a Fab portion of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a F(ab')2 portion of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a Fc portion of the antibody.
- the portion of the antibody comprises a Fv portion of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a variable domain of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises one or more CDR domains of the antibody.
- Antibodies are prepared according to conventional methodology. Monoclonal antibodies may be generated using the method of Kohler and Milstein (Nature, 256:495, 1975). To prepare monoclonal antibodies useful in the invention, a mouse or other appropriate host animal is immunized at suitable intervals (e.g., twice-weekly, weekly, twice-monthly or monthly) with antigenic forms of OXIR. The animal may be administered a final "boost" of antigen within one week of sacrifice. It is often desirable to use an immunologic adjuvant during immunization.
- Suitable immunologic adjuvants include Freund's complete adjuvant, Freund's incomplete adjuvant, alum, Ribi adjuvant, Hunter's Titermax, saponin adjuvants such as QS21 or Quil A, or CpG-containing immunostimulatory oligonucleotides.
- Other suitable adjuvants are well-known in the field.
- the animals may be immunized by subcutaneous, intraperitoneal, intramuscular, intravenous, intranasal or other routes. A given animal may be immunized with multiple forms of the antigen by multiple routes.
- the recombinant OX1R may be provided by expression with recombinant cell lines.
- OX1R may be provided in the form of human cells expressing OX1R at their surface.
- lymphocytes are isolated from the spleen, lymph node or other organ of the animal and fused with a suitable myeloma cell line using an agent such as polyethylene glycol to form a hydridoma.
- cells are placed in media permissive for growth of hybridomas but not the fusion partners using standard methods, as described (Coding, Monoclonal Antibodies: Principles and Practice: Production and Application of Monoclonal Antibodies in Cell Biology, Biochemistry and Immunology, 3rd edition, Academic Press, New York, 1996).
- cell supernatants are analyzed for the presence of antibodies of the desired specificity, i.e., that selectively bind the antigen.
- Suitable analytical techniques include ELISA, flow cytometry, immunoprecipitation, and western blotting. Other screening techniques are well-known in the field. Preferred techniques are those that confirm binding of antibodies to conformationally intact, natively folded antigen, such as non-denaturing ELISA, flow cytometry, and immunoprecipitation.
- an antibody from which the pFc' region has been enzymatically cleaved, or which has been produced without the pFc' region designated an F(ab')2 fragment, retains both of the antigen binding sites of an intact antibody.
- an antibody from which the Fc region has been enzymatically cleaved, or which has been produced without the Fc region designated an Fab fragment, retains one of the antigen binding sites of an intact antibody molecule.
- Fab fragments consist of a covalently bound antibody light chain and a portion of the antibody heavy chain denoted Fd.
- the Fd fragments are the major determinant of antibody specificity (a single Fd fragment may be associated with up to ten different light chains without altering antibody specificity) and Fd fragments retain epitope-binding ability in isolation.
- CDRs complementarity determining regions
- FRs framework regions
- CDR1 through CDRS complementarity determining regions
- compositions and methods that include humanized forms of antibodies.
- humanized describes antibodies wherein some, most or all of the amino acids outside the CDR regions are replaced with corresponding amino acids derived from human immunoglobulin molecules.
- Methods of humanization include, but are not limited to, those described in U.S. Pat. Nos. 4,816,567,5,225,539,5,585,089, 5,693,761, 5,693,762 and 5,859,205, which are hereby incorporated by reference.
- the above U. S. Pat. Nos. 5,585,089 and 5,693,761 , and WO 90/07861 also propose four possible criteria which may used in designing the humanized antibodies.
- the first proposal was that for an acceptor, use a framework from a particular human immunoglobulin that is unusually homologous to the donor immunoglobulin to be humanized, or use a consensus framework from many human antibodies.
- the second proposal was that if an amino acid in the framework of the human immunoglobulin is unusual and the donor amino acid at that position is typical for human sequences, then the donor amino acid rather than the acceptor may be selected.
- the third proposal was that in the positions immediately adj acent to the 3 CDRs in the humanized immunoglobulin chain, the donor amino acid rather than the acceptor amino acid may be selected.
- the fourth proposal was to use the donor amino acid reside at the framework positions at which the amino acid is predicted to have a side chain atom within 3 A of the CDRs in a three dimensional model of the antibody and is predicted to be capable of interacting with the CDRs.
- the above methods are merely illustrative of some of the methods that one skilled in the art could employ to make humanized antibodies.
- One of ordinary skill in the art will be familiar with other methods for antibody humanization.
- humanized forms of the antibodies some, most or all of the amino acids outside the CDR regions have been replaced with amino acids from human immunoglobulin molecules but where some, most or all amino acids within one or more CDR regions are unchanged. Small additions, deletions, insertions, substitutions or modifications of amino acids are permissible as long as they would not abrogate the ability of the antibody to bind a given antigen.
- Suitable human immunoglobulin molecules would include IgGl, IgG2, IgG3, IgG4, IgA and IgM molecules.
- a "humanized" antibody retains a similar antigenic specificity as the original antibody.
- the affinity and/or specificity of binding of the antibody may be increased using methods of "directed evolution", as described by Wu et al, I. Mol. Biol. 294: 151, 1999, the contents of which are incorporated herein by reference.
- Fully human monoclonal antibodies also can be prepared by immunizing mice transgenic for large portions of human immunoglobulin heavy and light chain loci. See, e.g., U.S. Pat. Nos. 5,591,669, 5,598,369, 5,545,806, 5,545,807, 6, 150,584, and references cited therein, the contents of which are incorporated herein by reference. These animals have been genetically modified such that there is a functional deletion in the production of endogenous (e.g., murine) antibodies. The animals are further modified to contain all or a portion of the human germ-line immunoglobulin gene locus such that immunization of these animals will result in the production of fully human antibodies to the antigen of interest.
- monoclonal antibodies can be prepared according to standard hybridoma technology. These monoclonal antibodies will have human immunoglobulin amino acid sequences and therefore will not provoke human anti-mouse antibody (KAMA) responses when administered to humans.
- KAMA human anti-mouse antibody
- In vitro methods also exist for producing human antibodies. These include phage display technology (U.S. Pat. Nos. 5,565,332 and 5,573,905) and in vitro stimulation of human B cells (U.S. Pat. Nos. 5,229,275 and 5,567,610). The contents of these patents are incorporated herein by reference.
- the present invention also provides for F(ab') 2 Fab, Fv and Fd fragments; chimeric antibodies in which the Fc and/or FR and/or CDRl and/or CDR2 and/or light chain CDR3 regions have been replaced by homologous human or non-human sequences; chimeric F(ab')2 fragment antibodies in which the FR and/or CDRl and/or CDR2 and/or light chain CDR3 regions have been replaced by homologous human or non-human sequences; chimeric Fab fragment antibodies in which the FR and/or CDRl and/or CDR2 and/or light chain CDR3 regions have been replaced by homologous human or non-human sequences; and chimeric Fd fragment antibodies in which the FR and/or CDRl and/or CDR2 regions have been replaced by homologous human or non-human sequences.
- the present invention also includes so-called single chain antibodies.
- the various antibody molecules and fragments may derive from any of the commonly known immunoglobulin classes, including but not limited to IgA, secretory IgA, IgE, IgG and IgM.
- IgG subclasses are also well known to those in the art and include but are not limited to human IgGl, IgG2, IgG3 and IgG4.
- the antibody according to the invention is a single domain antibody.
- the term "single domain antibody” (sdAb) or “VHH” refers to the single heavy chain variable domain of antibodies of the type that can be found in Camelid mammals which are naturally devoid of light chains. Such VHH are also called “nanobody®”. According to the invention, sdAb can particularly be llama sdAb.
- the agent is a polypeptide.
- the polypeptide is a functional equivalent of Orexin-A or Orexin-B.
- orexin-A has its general meaning in the art and refers to the amino acid sequence as shown by SEQ ID NO:2.
- Orexin-A (SEQ ID NO:2): p eplpdccrqk tcscrlyell hgagnhaagi ltlx
- orexin-B has its general meaning in the art and refers to the amino acid sequence as shown by SEQ ID NO:3.
- Orexin-B (SEQ ID NO:3): 1 fsgppglqgr lqrllqasgn haagiltm
- a “functional equivalent of orexin” is a polypeptide which is capable of binding to OX1R, thereby promoting an OX1R activity according to the invention.
- the term “functional equivalent” includes fragments, mutants, and muteins of Orexin-A and Orexin-B.
- the term “functionally equivalent” thus includes any equivalent of orexins (i.e.
- Orexin-A or Orexin-B obtained by altering the amino acid sequence, for example by one or more amino acid deletions, substitutions or additions such that the protein analogue retains the ability to bind to OX1R and promote an OX1R activity according to the invention (e.g. aoptosis of the cancer cell).
- Amino acid substitutions may be made, for example, by point mutation of the DNA encoding the amino acid sequence.
- the functional equivalent is at least 80% homologous to the corresponding protein. In a preferred embodiment, the functional equivalent is at least 90% homologous as assessed by any conventional analysis algorithm such as for example, the Pileup sequence analysis software (Program Manual for the Wisconsin Package, 1996).
- the term "a functionally equivalent fragment” as used herein also may mean any fragment or assembly of fragments of Orexin that binds to OX1R and promote the OX1R activity according to the invention. Accordingly the present invention provides a polypeptide which comprises consecutive amino acids having a sequence which corresponds to the sequence of at least a portion of Orexin-A or Orexin-B, which portion binds to OX1R and promotes the OX1R activity according to the invention.
- Functionally equivalent fragments may belong to the same protein family as the human Orexins identified herein.
- protein family is meant a group of proteins that share a common function and exhibit common sequence homology.
- homologous proteins may be derived from non-human species.
- the homology between functionally equivalent protein sequences is at least 25% across the whole of amino acid sequence of the complete protein. More In particular, the homology is at least 50%, even more In particular 75% across the whole of amino acid sequence of the protein or protein fragment. More In particular, homology is greater than 80% across the whole of the sequence. More In particular, homology is greater than 90% across the whole of the sequence. More In particular, homology is greater than 95% across the whole of the sequence.
- polypeptides of the invention may be produced by any suitable means, as will be apparent to those of skill in the art.
- expression may conveniently be achieved by culturing under appropriate conditions recombinant host cells containing the polypeptide of the invention.
- the polypeptide is produced by recombinant means, by expression from an encoding nucleic acid molecule.
- Systems for cloning and expression of a polypeptide in a variety of different host cells are well known. When expressed in recombinant form, the polypeptide is in particular generated by expression from an encoding nucleic acid in a host cell.
- Any host cell may be used, depending upon the individual requirements of a particular system. Suitable host cells include bacteria mammalian cells, plant cells, yeast and baculovirus systems. Mammalian cell lines available in the art for expression of a heterologous polypeptide include Chinese hamster ovary cells. HeLa cells, baby hamster kidney cells and many others. Bacteria are also preferred hosts for the production of recombinant protein, due to the ease with which bacteria may be manipulated and grown. A common, preferred bacterial host is E coli.
- the polypeptide of the invention is an immunoadhesin.
- immunoadhesin designates antibody-like molecules which combine the binding specificity of a heterologous protein (an “adhesin” which is able to bind to OX1R) with the effector functions of immunoglobulin constant domains.
- the immunoadhesins comprise a fusion of an amino acid sequence with the desired binding specificity to OX1R (i.e., is “heterologous"), and an immunoglobulin constant domain sequence.
- the adhesin part of an immunoadhesin molecule typically is a contiguous amino acid sequence comprising at least the binding site for OX1R.
- the adhesin comprises the polypeptides characterized by SEQ ID NO:2 or SEQ ID NO:3.
- the immunoglobulin constant domain sequence in the immunoadhesin may be obtained from any immunoglobulin, such as IgG-1, IgG-2, IgG-3, or IgG-4 subtypes, IgA (including IgA-1 and IgA-2), IgE, IgD or lgM.
- the immunoglobulin sequence typically, but not necessarily, is an immunoglobulin constant domain (Fc region).
- Immunoadhesins can possess many of the valuable chemical and biological properties of human antibodies. Since immunoadhesins can be constructed from a human protein sequence with a desired specificity linked to an appropriate human immunoglobulin hinge and constant domain (Fc) sequence, the binding specificity of interest can be achieved using entirely human components. Such immunoadhesins are minimally immunogenic to the patient, and are safe for chronic or repeated use.
- the Fc region is a native sequence Fc region. In one embodiment, the Fc region is a variant Fc region. In still another embodiment, the Fc region is a functional Fc region.
- Fc region is used to define a C-terminal region of an immunoglobulin heavy chain, including native sequence Fc regions and variant Fc regions.
- the boundaries of the Fc region of an immunoglobulin heavy chain might vary, the human IgG heavy chain Fc region is usually defined to stretch from an amino acid residue at position Cys226, or from Pro230, to the carboxyl-terminus thereof.
- the adhesion portion and the immunoglobulin sequence portion of the immunoadhesin may be linked by a minimal linker.
- the immunoglobulin sequence typically, but not necessarily, is an immunoglobulin constant domain.
- immunoglobulin moiety in the chimeras of the present invention may be obtained from IgGl, IgG2, IgG3 or IgG4 subtypes, IgA, IgE, IgD or IgM, but typically IgGl or IgG3.
- polypeptides of the invention, fragments thereof and fusion proteins can exhibit post-translational modifications, including, but not limited to glycosylations, (e.g., N-linked or O-linked glycosylations), myristylations, palmitylations, acetylations and phosphorylations (e.g., serine/threonine or tyrosine).
- glycosylations e.g., N-linked or O-linked glycosylations
- myristylations e.g., palmitylations
- acetylations e.g., serine/threonine or tyrosine
- polypeptides used in the therapeutic methods of the present invention may be modified in order to improve their therapeutic efficacy.
- modification of therapeutic compounds may be used to decrease toxicity, increase circulatory time, or modify biodistribution.
- the toxicity of potentially important therapeutic compounds can be decreased significantly by combination with a variety of drug carrier vehicles that modify biodistribution.
- adding dipeptides can improve the penetration of a circulating agent in the eye through the blood retinal barrier by using endogenous transporters.
- a strategy for improving drug viability is the utilization of water-soluble polymers.
- Various water-soluble polymers have been shown to modify biodistribution, improve the mode of cellular uptake, change the permeability through physiological barriers; and modify the rate of clearance from the body.
- water-soluble polymers have been synthesized that contain drug moieties as terminal groups, as part of the backbone, or as pendent groups on the polymer chain.
- PEG Polyethylene glycol
- Attachment to various drugs, proteins, and liposomes has been shown to improve residence time and decrease toxicity.
- PEG can be coupled to active agents through the hydroxyl groups at the ends of the chain and via other chemical methods; however, PEG itself is limited to at most two active agents per molecule.
- copolymers of PEG and amino acids were explored as novel biomaterials which would retain the biocompatibility properties of PEG, but which would have the added advantage of numerous attachment points per molecule (providing greater drug loading), and which could be synthetically designed to suit a variety of applications.
- PEGylation techniques for the effective modification of drugs.
- drug delivery polymers that consist of alternating polymers of PEG and tri-functional monomers such as lysine have been used by VectraMed (Plainsboro, N.J.).
- the PEG chains typically 2000 daltons or less
- Such copolymers retain the desirable properties of PEG, while providing reactive pendent groups (the carboxylic acid groups of lysine) at strictly controlled and predetermined intervals along the polymer chain.
- the reactive pendent groups can be used for derivatization, cross-linking, or conjugation with other molecules.
- These polymers are useful in producing stable, long-circulating pro-drugs by varying the molecular weight of the polymer, the molecular weight of the PEG segments, and the cleavable linkage between the drug and the polymer.
- the molecular weight of the PEG segments affects the spacing of the drug/linking group complex and the amount of drug per molecular weight of conjugate (smaller PEG segments provides greater drug loading).
- increasing the overall molecular weight of the block co-polymer conjugate will increase the circulatory half-life of the conjugate. Nevertheless, the conjugate must either be readily degradable or have a molecular weight below the threshold-limiting glomular filtration (e.g., less than 60 kDa).
- linkers may be used to maintain the therapeutic agent in a pro-drug form until released from the backbone polymer by a specific trigger, typically enzyme activity in the targeted tissue.
- a specific trigger typically enzyme activity in the targeted tissue.
- tissue activated drug delivery is particularly useful where delivery to a specific site of biodistribution is required and the therapeutic agent is released at or near the site of pathology.
- Linking group libraries for use in activated drug delivery are known to those of skill in the art and may be based on enzyme kinetics, prevalence of active enzyme, and cleavage specificity of the selected disease-specific enzymes. Such linkers may be used in modifying the protein or fragment of the protein described herein for therapeutic delivery.
- the OX1R agonist is an aptamer.
- Aptamers are a class of molecule that represents an alternative to antibodies in term of molecular recognition.
- Aptamers are oligonucleotide or oligopeptide sequences with the capacity to recognize virtually any class of target molecules with high affinity and specificity.
- Such ligands may be isolated through Systematic Evolution of Ligands by Exponential enrichment (SELEX) of a random sequence library.
- the random sequence library is obtainable by combinatorial chemical synthesis of DNA. In this library, each member is a linear oligomer, eventually chemically modified, of a unique sequence.
- Peptide aptamers consists of a conformationally constrained antibody variable region displayed by a platform protein, such as E. coli Thioredoxin A that are selected from combinatorial libraries by two hybrid methods.
- pancreatic cancer or “pancreas cancer” as used herein relates to cancer which is derived from pancreatic cells.
- pancreatic cancer included pancreatic adenocarcinoma (e.g., pancreatic ductal adenocarcinoma) as well as other tumors of the exocrine pancreas (e.g., serous cystadenomas), acinar cell cancers, intraductal papillary mucinous neoplasms (IPMN) and pancreatic neuroendocrine tumors (such as insulinomas).
- pancreatic adenocarcinoma e.g., pancreatic ductal adenocarcinoma
- other tumors of the exocrine pancreas e.g., serous cystadenomas
- IPMN intraductal papillary mucinous neoplasms
- pancreatic neuroendocrine tumors such as insulinomas.
- the OX1R agonist of the invention is administered to the subject with a therapeutically effective amount.
- a “therapeutically effective amount” is meant a sufficient amount of OX1R to treat pancreatic cancer at a reasonable benefit/risk ratio applicable to any medical treatment. It will be understood that the total daily usage of the compounds and compositions of the present invention will be decided by the attending physician within the scope of sound medical judgment.
- the specific therapeutically effective dose level for any particular subject will depend upon a variety of factors including the disorder being treated and the severity of the disorder; activity of the specific compound employed; the specific composition employed, the age, body weight, general health, sex and diet of the subject; the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coincidental with the specific polypeptide employed; and like factors well known in the medical arts.
- the daily dosage of the products may be varied over a wide range from 0.01 to 1,000 mg per adult per day.
- the compositions contain 0.01, 0.05, 0.1, 0.5, 1.0, 2.5, 5.0, 10.0, 15.0, 25.0, 50.0, 100, 250 and 500 mg of the active ingredient for the symptomatic adjustment of the dosage to the subject to be treated.
- a medicament typically contains from about 0.01 mg to about 500 mg of the active ingredient, in particular from 1 mg to about 100 mg of the active ingredient.
- An effective amount of the drug is ordinarily supplied at a dosage level from 0.0002 mg/kg to about 20 mg/kg of body weight per day, especially from about 0.001 mg/kg to 7 mg/kg of body weight per day.
- the OX1R agonist of the invention may be combined with pharmaceutically acceptable excipients, and optionally sustained-release matrices, such as biodegradable polymers, to form therapeutic compositions.
- “Pharmaceutically” or “pharmaceutically acceptable” refers to molecular entities and compositions that do not produce an adverse, allergic or other untoward reaction when administered to a mammal, especially a human, as appropriate.
- a pharmaceutically acceptable carrier or excipient refers to a non-toxic solid, semi- solid or liquid filler, diluent, encapsulating material or formulation auxiliary of any type.
- the active principle alone or in combination with another active principle, can be administered in a unit administration form, as a mixture with conventional pharmaceutical supports, to animals and human beings.
- Suitable unit administration forms comprise oral-route forms such as tablets, gel capsules, powders, granules and oral suspensions or solutions, sublingual and buccal administration forms, aerosols, implants, subcutaneous, transdermal, topical, intraperitoneal, intramuscular, intravenous, subdermal, transdermal, intrathecal and intranasal administration forms and rectal administration forms.
- the pharmaceutical compositions contain vehicles which are pharmaceutically acceptable for a formulation capable of being injected.
- vehicles which are pharmaceutically acceptable for a formulation capable of being injected.
- These may be in particular isotonic, sterile, saline solutions (monosodium or disodium phosphate, sodium, potassium, calcium or magnesium chloride and the like or mixtures of such salts), or dry, especially freeze-dried compositions which upon addition, depending on the case, of sterilized water or physiological saline, permit the constitution of injectable solutions.
- the pharmaceutical forms suitable for injectable use include sterile aqueous solutions or dispersions; formulations including sesame oil, peanut oil or aqueous propylene glycol ; and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersions.
- the form must be sterile and must be fluid to the extent that easy syringability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms, such as bacteria and fungi.
- Solutions comprising compounds of the invention as free base or pharmacologically acceptable salts can be prepared in water suitably mixed with a surfactant, such as hydroxypropylcellulose. Dispersions can also be prepared in glycerol, liquid polyethylene glycols, and mixtures thereof and in oils. Under ordinary conditions of storage and use, these preparations contain a preservative to prevent the growth of microorganisms.
- the OX1R agonist of the invention can 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 which 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 ferric hydroxides, and such organic bases as isopropylamine, trimethylamine, histidine, procaine and the like.
- the carrier can also be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), suitable mixtures thereof, and vegetables oils.
- the proper fluidity can be maintained, for example, by the use of a coating, such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
- the prevention of the action of microorganisms can be brought about by various antibacterial and antifuCASK agents, for example, parabens, chlorobutanol, phenol, sorbic acid, thimerosal, and the like.
- isotonic agents for example, sugars or sodium chloride.
- Prolonged absorption of the injectable compositions can be brought about by the use in the compositions of agents delaying absorption, for example, aluminium monostearate and gelatin.
- Sterile injectable solutions are prepared by incorporating the active polypeptides in the required amount in the appropriate solvent with various of the other ingredients enumerated above, as required, followed by filtered sterilization.
- dispersions are prepared by incorporating the various sterilized active ingredients into a sterile vehicle which contains the basic dispersion medium and the required other ingredients from those enumerated above.
- the preferred methods of preparation are vacuum-drying and freeze-drying techniques which yield a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.
- solutions Upon formulation, solutions will be administered in a manner compatible with the dosage formulation and in such amount as is therapeutically effective.
- the formulations are easily administered in a variety of dosage forms, such as the type of injectable solutions described above, but drug release capsules and the like can also be employed.
- aqueous solutions For parenteral administration in an aqueous solution, for example, the solution should be suitably buffered if necessary and the liquid diluent first rendered isotonic with sufficient saline or glucose.
- aqueous solutions are especially suitable for intravenous, intramuscular, subcutaneous and intraperitoneal administration.
- sterile aqueous media which can be employed will be known to those of skill in the art in light of the present disclosure.
- one dosage could be dissolved in 1 ml of isotonic NaCl solution and either added to 1000 ml of hypodermoclysis fluid or injected at the proposed site of infusion. Some variation in dosage will necessarily occur depending on the condition of the subject being treated. The person responsible for administration will, in any event, determine the appropriate dose for the individual subject.
- the OX1R agonist of the invention may be formulated within a therapeutic mixture to comprise about 0.0001 to 1.0 milligrams, or about 0.001 to 0.1 milligrams, or about 0.1 to 1.0 or even about 10 milligrams per dose or so. Multiple doses can also be administered.
- other pharmaceutically acceptable forms include, e.g. tablets or other solids for oral administration; liposomal formulations ; time release capsules ; and any other form currently used.
- the OX1R agonist of the invention is used in combination with a chemotherapeutic agent.
- Chemotherapeutic agents include, but are not limited to alkylating agents such as thiotepa and cyclosphosphamide; alkyl sulfonates such as busulfan, improsulfan and piposulfan; aziridines such as benzodopa, carboquone, meturedopa, and uredopa; ethylenimines and methylamelamines including altretamine, triethylenemelamine, trietylenephosphoramide, triethiylenethiophosphoramide and trimethylolomelamine; acetogenins (especially bullatacin and bullatacinone); a camptothecin (including the synthetic analogue topotecan); bryostatin; callystatin; CC-1065 (including its adozelesin, carzelesin and bizelesin synthetic analogues); cryptophycins (particularly cryptophycin 1 and cryptophycin 8); dolastatin; du
- calicheamicin especially calicheamicin gammall and calicheamicin omegall ; dynemicin, including dynemicin A; bisphosphonates, such as clodronate; an esperamicin; as well as neocarzinostatin chromophore and related chromoprotein enediyne antiobiotic chromophores, aclacinomysins, actinomycin, authrarnycin, azaserine, bleomycins, cactinomycin, carabicin, caminomycin, carzinophilin, chromomycinis, dactinomycin, daunorubicin, detorubicin, 6-diazo-5-oxo-L-norleucine, doxorubicin (including morpholino-doxorubicin, cyanomorpholino-doxorubicin, 2-pyrrolino- doxorubicin and de
- a further object of the invention relates to a method for treating a pancreatic cancer in a subject in thereof comprising the steps consisting of i) determining the expression level of OXIR in a tumour tissue sample obtained from the subject, ii) comparing the expression level determined at step i) with a reference value and iii) administering the subj ect with a therapeutically effective amount of an OX1R agonist when the level determined at step i) is higher than the reference value.
- the expression level of OX1R may be determined by any well known method in the art. For example methods for determining the quantity of mRNA are well known in the art.
- the nucleic acid contained in the samples e.g., cell or tissue prepared from the patient
- the extracted mRNA is then detected by hybridization (e. g., Northern blot analysis) and/or amplification (e.g., RT-PCR).
- hybridization e. g., Northern blot analysis
- amplification e.g., RT-PCR
- RT-PCR e.g., RT-PCR
- quantitative or semi-quantitative RT-PCR is preferred. Real-time quantitative or semi-quantitative RT-PCR is particularly advantageous.
- IHC immunohistochemistry
- OX1R targets of interest
- a sample is fixed with formalin, embedded in paraffin and cut into sections for staining and subsequent inspection by light microscopy.
- Current methods of IHC use either direct labeling or secondary antibody-based or hapten-based labeling.
- IHC systems include, for example, EnVision(TM) (DakoCytomation), Powervision(R) (Immunovision, Springdale, AZ), the NBA(TM) kit (Zymed Laboratories Inc., South San Francisco, CA), HistoFine(R) (Nichirei Corp, Tokyo, Japan).
- a tumor tissue section may be mounted on a slide or other support after incubation with antibodies directed against OX1R. Then, microscopic inspections in the sample mounted on a suitable solid support may be performed.
- sections comprising samples may be mounted on a glass slide or other planar support, to highlight by selective staining the presence of the proteins of interest.
- a “reference value” can be a “threshold value” or a “cut-off value”. Typically, a “threshold value” or “cut-off value” can be determined experimentally, empirically, or theoretically.
- a threshold value can also be arbitrarily selected based upon the existing experimental and/or clinical conditions, as would be recognized by a person of ordinary skilled in the art. The threshold value has to be determined in order to obtain the optimal sensitivity and specificity according to the function of the test and the benefit/risk balance (clinical consequences of false positive and false negative). Typically, the optimal sensitivity and specificity (and so the threshold value) can be determined using a Receiver Operating Characteristic (ROC) curve based on experimental data.
- ROC Receiver Operating Characteristic
- the threshold value is derived from the OXIR expression level (or ratio, or score) determined in a tumor tissue sample derived from one or more subjects having sufficient amount of OXIR level to get an efficient treatment with the OXIR agonist. Furthermore, retrospective measurement of the OXIR expression levels (or ratio, or scores) in properly banked historical subject samples may be used in establishing these threshold values.
- a further object of the invention relates to a method for screening a drug for the treatment of pancreatic cancer comprising the steps of i) providing a plurality of test substances ii) determining whether the test substances are OXIR agonists and iii) positively selecting the test substances that are OXIR agonists.
- the screening method of the invention involves providing appropriate cells which express the orexin- 1 receptor on their surface.
- Such cells include cells from mammals, yeast, Drosophila or E. coli.
- a polynucleotide encoding the orexin- 1 receptor is used to transfect cells to express the receptor.
- the expressed receptor is then contacted with a test substance and an orexin- 1 receptor ligand (e.g. orexins), as appropriate, to observe activation of a functional response such as recruitment of SHP-2 and induction of cell apoptosis of the cell.
- Functional assays may be performed as described in El Firar A, Voisin T, Rouyer-Fessard C, Ostuni MA, Couvineau A, Laburthe M.
- comparison steps may involve to compare the activity induced by the test substance and the activity induce by a well known OXIR agonist such as orexin.
- OXIR agonist such as orexin.
- substances capable of having an activity similar or even better than a well known OXIR agonist are positively selected.
- the screening method of the invention may also involve screening for test substances capable of binding of to orexin-1 receptor present at cell surface.
- the test substance is labelled (e.g. with a radioactive label) and the binding is compared to a well known OXIR agonist such as orexin.
- OXIR agonist such as orexin.
- the preparation is incubated with labelled OXIR and complexes of test substances bound to NGAL are isolated and characterized according to routine methods known in the art.
- the OXIR may be bound to a solid support so that binding molecules solubilized from cells are bound to the column and then eluted and characterized according to routine methods.
- a cellular compartment may be prepared from a cell that expresses a molecule that binds NGAL such as a molecule of a signalling or regulatory pathway modulated by NGAL.
- the preparation is incubated with labelled NGAL in the absence or the presence of a candidate compound.
- the ability of the candidate compound to bind the binding molecule is reflected in decreased binding of the labelled ligand.
- the candidate compound is selected from the group consisting of small organic molecules, peptides, polypeptides or oligonucleotides.
- test substances that have been positively selected may be subjected to further selection steps in view of further assaying its properties for the treatment of pancreatic cancer.
- candidate compounds that have been positively selected may be subjected to further selection steps in view of further assaying its properties on animal models for pancreatic cancer.
- the above assays may be performed using high throughput screening techniques for identifying test substances for developing drugs that may be useful to the treatment of pancreatic cancer.
- High throughput screening techniques may be carried out using multi-well plates (e.g., 96-, 389-, or 1536-well plates), in order to carry out multiple assays using an automated robotic system.
- multi-well plates e.g., 96-, 389-, or 1536-well plates
- large libraries of test substances may be assayed in a highly efficient manner.
- stably-transfected cells growing in wells of micro-titer plates 96 well or 384 well
- Compounds in the library will be applied one at a time in an automated fashion to the wells of the microtitre dishes containing the transgenic cells described above.
- test substances which activate the apoptotic signals can be positively sleeted fro further characterization.
- these assays offer several advantages.
- the exposure of the test substance to a whole cell allows for the evaluation of its activity in the natural context in which the test substance may act. Because this assay can readily be performed in a microtitre plate format, the assays described can be performed by an automated robotic system, allowing for testing of large numbers of test samples within a reasonably short time frame.
- the assays of the invention can be used as a screen to assess the activity of a previously untested compound or extract, in which case a single concentration is tested and compared to controls.
- FIGURES are a diagrammatic representation of FIGURES.
- Figure 1 shows tumoral reduction induced by orexin-A injection in nude mice xenografted with AsPC-1 cells.
- Orexins are hypothalamic peptides involved in sleep/wake control.
- OXIR orexin 1 receptor
- ITIMs immunohistochemistry
- PAC Pancreatic ductal adenocarcinomas
- the aims of this study were: 1/ to investigate the presence of OXIR in human PAC cell lines and to analyze orexin-A effects in relation to apoptosis; 21 to develop an in vivo heterotopic xenograft model from the cell lines expressing OXIR, for the study of tumor growth in response to Orexin-A.
- the expression of OXIR was studied at mRNA (RT-PCR), proteins (immunocytochemistry) and functional levels in 3 PAC cell lines (AsPC-1, HPAF-II and SW1990).
- the development of an animal model (heterotopic xenograft) from the cell line expressing OXIR has allowed studying the effect of Orexin-A in tumor growth. Resected tumors were analyzed by immunohistochemistry.
- AsPC-1 cell line expresses OXIR.
- the treatment with Orexin-A promoted a 32% cell growth inhibition by promoting a mitochondrial apoptosis.
- SHP inhibitor NSC-87877 we demonstrated the ability of the inhibitor to reverse orexin-induced apoptosis in AsPC-1 cells.
- Orexin-A injection in nude mice xenografted with AsPC-1 cells has declined 49% of tumor progression in treated cases. All the tumors corresponded to poorly differentiated adenocarcinomas expressing cytokeratin 7, CA9 (hypoxia marker) and OX1R. Induction of apoptosis was observed in Orexin-A treated tumors (activated caspase-3).
- orexin receptors represent a new promising target in pancreatic antineoplastic therapy and/or preclinical diagnostic.
Abstract
The present invention relates to methods and pharmaceutical compositions for the treatment of pancreatic cancers. In particular, the present invention relates to an OXIR agonist for use in the treatment of pancreatic cancer in a subject in need thereof.
Description
METHODS AND PHARMACEUTICAL COMPOSITIONS FOR THE TREATMENT
OF PANCREATIC CANCERS
FIELD OF THE INVENTION:
The present invention relates to methods and pharmaceutical compositions for the treatment of pancreatic cancers.
BACKGROUND OF THE INVENTION:
Pancreatic cancer is an aggressive disease associated with an extremely poor prognosis. It is one of the most malignant cancers, characterized insidious onset, usually late diagnosis and low survival rate after diagnosis. For example, pancreatic ductal adenocarcinoma (PDAC) is the fourth leading cause of cancer death in the United States. In spite of recent therapeutic advances, long term survival in PDAC is often limited to patients who have had surgery in early stage of the disease. The biological aggressiveness of PDAC is due, in part, to the tumor's resistance to chemotherapy. Presently, the standard of treatment remains systemic chemotherapy with gemcitabine, with palliative objectives and a disappointing marginal survival advantage. Very recently, the demonstration of a clinically and statistically meaningful survival advantage with the 5-fluorouracil, leucovorin, irinotecan and oxaliplatin (FOLFIRINOX) regimen over single-agent gemcitabine (Conroy et al., N. Engl. J. Med., 364: 1817- 1825 (2011)), and the introduction of nanoparticles of albumin- bound paclitaxel (nad-paclitaxel) to putatively target the desmoplastic stroma characteristic of pancreatic ductal adenocarcinoma (PDAC) (Garber, K., J. Natl. Cancer Inst., 102: 448-450 (2010)), have raised hope that innovative combinations and improved delivery of classical cytotoxics may indeed substantially affect chemotherapy efficacy in advanced PDAC. Therefore, despite marginal advances in pancreatic cancer treatment, there remains a need for improved therapies and more creative approaches to devising and delivering effective pancreatic cancer therapies.
The orexins (hypocretins) comprise two neuropeptides produced in the hypothalamus: the orexin A (OX-A) (a 33 amino acid peptide) and the orexin B (OX-B) (a 28 amino acid peptide) (Sakurai T. et al, Cell, 1998, 92, 573-585). Orexins are found to stimulate food consumption in rats suggesting a physiological role for these peptides as mediators in the central feedback mechanism that regulates feeding behaviour. Orexins regulate states of sleep and wakefulness opening potentially novel therapeutic approaches for narcoleptic or
insomniac patients. Orexins have also been indicated as playing a role in arousal, reward, learning and memory. Two orexin receptors have been cloned and characterized in mammals. They belong to the super family of G-protein coupled receptors (7-transmembrane spanning receptor) (Sakurai T. et al, Cell, 1998, 92, 573-585): the orexin-1 receptor (OXIR or HCTR1) is selective for OX-A and the orexin-2 receptor (OX2R orHCTR2) is capable to bind OX- A as well as OX-B. A recent study shows that activation of OXIR by orexin can promote robust in vitro and in vivo apoptosis in colon cancer cells even when they are resistant to the most commonly used drug in colon cancer chemotherapy (Voisin T, El Firar A, Fasseu M, Rouyer-Fessard C, Descatoire V, Walker F, Paradis V, Bedossa P, Henin D, Lehy T, Laburthe M. Aberrant expression of 0X1 receptors for orexins in colon cancers and liver metastases: an openable gate to apoptosis. Cancer Res. 201 1 May 1 ;71(9):3341-51). Remarkably, all primary colorectal tumors regardless of their localization and Duke's stages expressed OXIR while adjacent normal colonocytes as well as control normal tissues were negative. Thus this study supports that OXIR is an Achilles' s heel of colon cancers (even chemoresi stance) and suggests that OXIR agonists might be novel candidates for colon cancer therapy.
SUMMARY OF THE INVENTION:
The present invention relates to methods and pharmaceutical compositions for the treatment of pancreatic cancers. In particular, the present invention relates to an OXIR agonist for use in the treatment of pancreatic cancer in a subject in need thereof.
DETAILED DESCRIPTION OF THE INVENTION:
The present invention relates to an OXIR agonist for use in the treatment of pancreatic cancer in a subject in need thereof.
As used herein, the tern "OXIR" has its general meaning in the art and refers to the 7- transmembrane spanning receptor OXIR for orexins. According to the invention, OXIR promotes apoptosis in the human prancreatic cancer cell line through a mechanism which is not related to Gq-mediated phopholipase C activation and cellular calcium transients. Orexins induce indeed tyrosine phosphorylation of 2 tyrosine-based motifs in OXIR, ITIM and ITSM, resulting in the recruitment of the phosphotyrosine phosphatase SHP-2, the activation of which is responsible for mitochondrial apoptosis (Voisin T, El Firar A, Rouyer-Fessard C, Gratio V, Laburthe M. A hallmark of immunoreceptor, the tyrosine-based inhibitory motif
ITIM, is present in the G protein-coupled receptor OXIR for orexins and drives apoptosis: a novel mechanism. FASEB J. 2008 Jun;22(6): 1993-2002.;E1 Firar A, Voisin T, Rouyer- Fessard C, Ostuni MA, Couvineau A, Laburthe M. Discovery of a functional immunoreceptor tyrosine-based switch motif in a 7-transmembrane-spanning receptor: role in the orexin receptor OXIR-driven apoptosis. FASEB J. 2009 Dec;23(12):4069-80. doi: 10.1096/fj.09- 131367. Epub 2009 Aug 6.). An exemplary amino acid sequence of OXIR is shown as SEQ ID NO: l . orexin receptor-1 OXIR (SEQ ID NO: 1)
1 mepsatpgaq mgvppgsrep spvppdyede flrylwrdyl ypkqyewvli aayvavfvva
61 lvgntlvcla vwrnhhmrtv tnyfivnlsl advlvtaicl pasllvdite swlfghalck
121 vipylqavsv svavltlsfi aldrwyaich pllfkstarr argsilgiwa vslaimvpqa
181 avmecssvlp elanrtrlfs vcderwaddl ypkiyhscff ivtylaplgl mamayfqifr
241 klwgrqipgt tsalvrnwkr psdqlgdleq glsgepqprg raflaevkqm rarrktakml
301 mvvllvfalc ylpisvlnvl krvfgmfrqa sdreavyacf tfshwlvyan saanpiiynf
361 lsgkfreqfk aafscclpgl gpcgslkaps prssashksl slqsrcsisk isehvvltsv
421 ttvlp
Accordingly, as used herein, the term "OXIR agonist" refers to any compound natural or not that is able to bind to OXIR and promotes OXIR activity which consists of activation of signal transduction pathways involving recruitment of SFIP-2 and the induction of apoptosis of the cell, independently of transient calcium release.
In some embodiments, the OXIR agonist is a small organic molecule. The term "small organic molecule" refers to a molecule of a size comparable to those organic molecules generally used in pharmaceuticals. The term excludes biological macromolecules (e. g., proteins, nucleic acids, etc.). Preferred small organic molecules range in size up to about 5000 Da, more In particular up to 2000 Da, and most In particular up to about 1000 Da. In some embodiment, the OXIR agonist is an OXIR antibody or a portion thereof.
As used herein, "antibody" includes both naturally occurring and non- naturally occurring antibodies. Specifically, "antibody" includes polyclonal and monoclonal antibodies, and monovalent and divalent fragments thereof. Furthermore, "antibody" includes chimeric
antibodies, wholly synthetic antibodies, single chain antibodies, and fragments thereof. The antibody may be a human or nonhuman antibody. A nonhuman antibody may be humanized by recombinant methods to reduce its immunogenicity in man. In one embodiment of the antibodies or portions thereof described herein, the antibody is a monoclonal antibody. In one embodiment of the antibodies or portions thereof described herein, the antibody is a polyclonal antibody. In one embodiment of the antibodies or portions thereof described herein, the antibody is a humanized antibody. In one embodiment of the antibodies or portions thereof described herein, the antibody is a chimeric antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a light chain of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a heavy chain of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a Fab portion of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a F(ab')2 portion of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a Fc portion of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a Fv portion of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises a variable domain of the antibody. In one embodiment of the antibodies or portions thereof described herein, the portion of the antibody comprises one or more CDR domains of the antibody.
Antibodies are prepared according to conventional methodology. Monoclonal antibodies may be generated using the method of Kohler and Milstein (Nature, 256:495, 1975). To prepare monoclonal antibodies useful in the invention, a mouse or other appropriate host animal is immunized at suitable intervals (e.g., twice-weekly, weekly, twice-monthly or monthly) with antigenic forms of OXIR. The animal may be administered a final "boost" of antigen within one week of sacrifice. It is often desirable to use an immunologic adjuvant during immunization. Suitable immunologic adjuvants include Freund's complete adjuvant, Freund's incomplete adjuvant, alum, Ribi adjuvant, Hunter's Titermax, saponin adjuvants such as QS21 or Quil A, or CpG-containing immunostimulatory oligonucleotides. Other suitable adjuvants are well-known in the field. The animals may be immunized by subcutaneous, intraperitoneal, intramuscular, intravenous, intranasal or other routes. A given animal may be
immunized with multiple forms of the antigen by multiple routes. Briefly, the recombinant OX1R may be provided by expression with recombinant cell lines. In particular, OX1R may be provided in the form of human cells expressing OX1R at their surface. Following the immunization regimen, lymphocytes are isolated from the spleen, lymph node or other organ of the animal and fused with a suitable myeloma cell line using an agent such as polyethylene glycol to form a hydridoma. Following fusion, cells are placed in media permissive for growth of hybridomas but not the fusion partners using standard methods, as described (Coding, Monoclonal Antibodies: Principles and Practice: Production and Application of Monoclonal Antibodies in Cell Biology, Biochemistry and Immunology, 3rd edition, Academic Press, New York, 1996). Following culture of the hybridomas, cell supernatants are analyzed for the presence of antibodies of the desired specificity, i.e., that selectively bind the antigen. Suitable analytical techniques include ELISA, flow cytometry, immunoprecipitation, and western blotting. Other screening techniques are well-known in the field. Preferred techniques are those that confirm binding of antibodies to conformationally intact, natively folded antigen, such as non-denaturing ELISA, flow cytometry, and immunoprecipitation.
Significantly, as is well-known in the art, only a small portion of an antibody molecule, the paratope, is involved in the binding of the antibody to its epitope (see, in general, Clark, W. R. (1986) The Experimental Foundations of Modern Immunology Wiley & Sons, Inc., New York; Roitt, I. (1991) Essential Immunology, 7th Ed., Blackwell Scientific Publications, Oxford). The Fc' and Fc regions, for example, are effectors of the complement cascade but are not involved in antigen binding. An antibody from which the pFc' region has been enzymatically cleaved, or which has been produced without the pFc' region, designated an F(ab')2 fragment, retains both of the antigen binding sites of an intact antibody. Similarly, an antibody from which the Fc region has been enzymatically cleaved, or which has been produced without the Fc region, designated an Fab fragment, retains one of the antigen binding sites of an intact antibody molecule. Proceeding further, Fab fragments consist of a covalently bound antibody light chain and a portion of the antibody heavy chain denoted Fd. The Fd fragments are the major determinant of antibody specificity (a single Fd fragment may be associated with up to ten different light chains without altering antibody specificity) and Fd fragments retain epitope-binding ability in isolation.
Within the antigen-binding portion of an antibody, as is well-known in the art, there are complementarity determining regions (CDRs), which directly interact with the epitope of
the antigen, and framework regions (FRs), which maintain the tertiary structure of the paratope (see, in general, Clark, 1986; Roitt, 1991). In both the heavy chain Fd fragment and the light chain of IgG immunoglobulins, there are four framework regions (FR1 through FR4) separated respectively by three complementarity determining regions (CDR1 through CDRS). The CDRs, and in particular the CDRS regions, and more particularly the heavy chain CDRS, are largely responsible for antibody specificity.
It is now well-established in the art that the non CDR regions of a mammalian antibody may be replaced with similar regions of conspecific or heterospecific antibodies while retaining the epitopic specificity of the original antibody. This is most clearly manifested in the development and use of "humanized" antibodies in which non-human CDRs are covalently joined to human FR and/or Fc/pFc' regions to produce a functional antibody.
This invention provides in certain embodiments compositions and methods that include humanized forms of antibodies. As used herein, "humanized" describes antibodies wherein some, most or all of the amino acids outside the CDR regions are replaced with corresponding amino acids derived from human immunoglobulin molecules. Methods of humanization include, but are not limited to, those described in U.S. Pat. Nos. 4,816,567,5,225,539,5,585,089, 5,693,761, 5,693,762 and 5,859,205, which are hereby incorporated by reference. The above U. S. Pat. Nos. 5,585,089 and 5,693,761 , and WO 90/07861 also propose four possible criteria which may used in designing the humanized antibodies. The first proposal was that for an acceptor, use a framework from a particular human immunoglobulin that is unusually homologous to the donor immunoglobulin to be humanized, or use a consensus framework from many human antibodies. The second proposal was that if an amino acid in the framework of the human immunoglobulin is unusual and the donor amino acid at that position is typical for human sequences, then the donor amino acid rather than the acceptor may be selected. The third proposal was that in the positions immediately adj acent to the 3 CDRs in the humanized immunoglobulin chain, the donor amino acid rather than the acceptor amino acid may be selected. The fourth proposal was to use the donor amino acid reside at the framework positions at which the amino acid is predicted to have a side chain atom within 3 A of the CDRs in a three dimensional model of the antibody and is predicted to be capable of interacting with the CDRs. The above methods are merely illustrative of some of the methods that one skilled in the art could employ to make
humanized antibodies. One of ordinary skill in the art will be familiar with other methods for antibody humanization.
In one embodiment of the humanized forms of the antibodies, some, most or all of the amino acids outside the CDR regions have been replaced with amino acids from human immunoglobulin molecules but where some, most or all amino acids within one or more CDR regions are unchanged. Small additions, deletions, insertions, substitutions or modifications of amino acids are permissible as long as they would not abrogate the ability of the antibody to bind a given antigen. Suitable human immunoglobulin molecules would include IgGl, IgG2, IgG3, IgG4, IgA and IgM molecules. A "humanized" antibody retains a similar antigenic specificity as the original antibody. However, using certain methods of humanization, the affinity and/or specificity of binding of the antibody may be increased using methods of "directed evolution", as described by Wu et al, I. Mol. Biol. 294: 151, 1999, the contents of which are incorporated herein by reference.
Fully human monoclonal antibodies also can be prepared by immunizing mice transgenic for large portions of human immunoglobulin heavy and light chain loci. See, e.g., U.S. Pat. Nos. 5,591,669, 5,598,369, 5,545,806, 5,545,807, 6, 150,584, and references cited therein, the contents of which are incorporated herein by reference. These animals have been genetically modified such that there is a functional deletion in the production of endogenous (e.g., murine) antibodies. The animals are further modified to contain all or a portion of the human germ-line immunoglobulin gene locus such that immunization of these animals will result in the production of fully human antibodies to the antigen of interest. Following immunization of these mice (e.g., XenoMouse (Abgenix), HuMAb mice (Medarex/GenPharm)), monoclonal antibodies can be prepared according to standard hybridoma technology. These monoclonal antibodies will have human immunoglobulin amino acid sequences and therefore will not provoke human anti-mouse antibody (KAMA) responses when administered to humans. In vitro methods also exist for producing human antibodies. These include phage display technology (U.S. Pat. Nos. 5,565,332 and 5,573,905) and in vitro stimulation of human B cells (U.S. Pat. Nos. 5,229,275 and 5,567,610). The contents of these patents are incorporated herein by reference.
Thus, as will be apparent to one of ordinary skill in the art, the present invention also provides for F(ab') 2 Fab, Fv and Fd fragments; chimeric antibodies in which the Fc and/or FR and/or CDRl and/or CDR2 and/or light chain CDR3 regions have been replaced by homologous human or non-human sequences; chimeric F(ab')2 fragment antibodies in which the FR and/or CDRl and/or CDR2 and/or light chain CDR3 regions have been replaced by homologous human or non-human sequences; chimeric Fab fragment antibodies in which the FR and/or CDRl and/or CDR2 and/or light chain CDR3 regions have been replaced by homologous human or non-human sequences; and chimeric Fd fragment antibodies in which the FR and/or CDRl and/or CDR2 regions have been replaced by homologous human or non- human sequences. The present invention also includes so-called single chain antibodies.
The various antibody molecules and fragments may derive from any of the commonly known immunoglobulin classes, including but not limited to IgA, secretory IgA, IgE, IgG and IgM. IgG subclasses are also well known to those in the art and include but are not limited to human IgGl, IgG2, IgG3 and IgG4.
In another embodiment, the antibody according to the invention is a single domain antibody. The term "single domain antibody" (sdAb) or "VHH" refers to the single heavy chain variable domain of antibodies of the type that can be found in Camelid mammals which are naturally devoid of light chains. Such VHH are also called "nanobody®". According to the invention, sdAb can particularly be llama sdAb.
In one embodiment of the agents described herein, the agent is a polypeptide. In a particular embodiment the polypeptide is a functional equivalent of Orexin-A or Orexin-B.
As used herein the term "orexin-A" has its general meaning in the art and refers to the amino acid sequence as shown by SEQ ID NO:2.
Orexin-A (SEQ ID NO:2): peplpdccrqk tcscrlyell hgagnhaagi ltlx
As used herein the term "orexin-B" has its general meaning in the art and refers to the amino acid sequence as shown by SEQ ID NO:3.
Orexin-B (SEQ ID NO:3): 1 fsgppglqgr lqrllqasgn haagiltm
As used herein, a "functional equivalent of orexin" is a polypeptide which is capable of binding to OX1R, thereby promoting an OX1R activity according to the invention. The term "functional equivalent" includes fragments, mutants, and muteins of Orexin-A and Orexin-B. The term "functionally equivalent" thus includes any equivalent of orexins (i.e. Orexin-A or Orexin-B) obtained by altering the amino acid sequence, for example by one or more amino acid deletions, substitutions or additions such that the protein analogue retains the ability to bind to OX1R and promote an OX1R activity according to the invention (e.g. aoptosis of the cancer cell). Amino acid substitutions may be made, for example, by point mutation of the DNA encoding the amino acid sequence.
In some embodiments, the functional equivalent is at least 80% homologous to the corresponding protein. In a preferred embodiment, the functional equivalent is at least 90% homologous as assessed by any conventional analysis algorithm such as for example, the Pileup sequence analysis software (Program Manual for the Wisconsin Package, 1996). The term "a functionally equivalent fragment" as used herein also may mean any fragment or assembly of fragments of Orexin that binds to OX1R and promote the OX1R activity according to the invention. Accordingly the present invention provides a polypeptide which comprises consecutive amino acids having a sequence which corresponds to the sequence of at least a portion of Orexin-A or Orexin-B, which portion binds to OX1R and promotes the OX1R activity according to the invention.
Functionally equivalent fragments may belong to the same protein family as the human Orexins identified herein. By "protein family" is meant a group of proteins that share a common function and exhibit common sequence homology. Homologous proteins may be derived from non-human species. In particular, the homology between functionally equivalent protein sequences is at least 25% across the whole of amino acid sequence of the complete protein. More In particular, the homology is at least 50%, even more In particular 75% across the whole of amino acid sequence of the protein or protein fragment. More In particular, homology is greater than 80% across the whole of the sequence. More In particular, homology is greater than 90% across the whole of the sequence. More In particular, homology is greater than 95% across the whole of the sequence.
The polypeptides of the invention may be produced by any suitable means, as will be apparent to those of skill in the art. In order to produce sufficient amounts of polypeptides or functional equivalents thereof for use in accordance with the present invention, expression may conveniently be achieved by culturing under appropriate conditions recombinant host cells containing the polypeptide of the invention. In particular, the polypeptide is produced by recombinant means, by expression from an encoding nucleic acid molecule. Systems for cloning and expression of a polypeptide in a variety of different host cells are well known. When expressed in recombinant form, the polypeptide is in particular generated by expression from an encoding nucleic acid in a host cell. Any host cell may be used, depending upon the individual requirements of a particular system. Suitable host cells include bacteria mammalian cells, plant cells, yeast and baculovirus systems. Mammalian cell lines available in the art for expression of a heterologous polypeptide include Chinese hamster ovary cells. HeLa cells, baby hamster kidney cells and many others. Bacteria are also preferred hosts for the production of recombinant protein, due to the ease with which bacteria may be manipulated and grown. A common, preferred bacterial host is E coli.
In some embodiments, the polypeptide of the invention is an immunoadhesin.
As used herein, the term "immunoadhesin" designates antibody-like molecules which combine the binding specificity of a heterologous protein (an "adhesin" which is able to bind to OX1R) with the effector functions of immunoglobulin constant domains. Structurally, the immunoadhesins comprise a fusion of an amino acid sequence with the desired binding specificity to OX1R (i.e., is "heterologous"), and an immunoglobulin constant domain sequence. The adhesin part of an immunoadhesin molecule typically is a contiguous amino acid sequence comprising at least the binding site for OX1R. In one embodiment, the adhesin comprises the polypeptides characterized by SEQ ID NO:2 or SEQ ID NO:3. The immunoglobulin constant domain sequence in the immunoadhesin may be obtained from any immunoglobulin, such as IgG-1, IgG-2, IgG-3, or IgG-4 subtypes, IgA (including IgA-1 and IgA-2), IgE, IgD or lgM.
The immunoglobulin sequence typically, but not necessarily, is an immunoglobulin constant domain (Fc region). Immunoadhesins can possess many of the valuable chemical and biological properties of human antibodies. Since immunoadhesins can be constructed from a human protein sequence with a desired specificity linked to an appropriate human
immunoglobulin hinge and constant domain (Fc) sequence, the binding specificity of interest can be achieved using entirely human components. Such immunoadhesins are minimally immunogenic to the patient, and are safe for chronic or repeated use. In one embodiment, the Fc region is a native sequence Fc region. In one embodiment, the Fc region is a variant Fc region. In still another embodiment, the Fc region is a functional Fc region. As used herein, the term "Fc region" is used to define a C-terminal region of an immunoglobulin heavy chain, including native sequence Fc regions and variant Fc regions. Although the boundaries of the Fc region of an immunoglobulin heavy chain might vary, the human IgG heavy chain Fc region is usually defined to stretch from an amino acid residue at position Cys226, or from Pro230, to the carboxyl-terminus thereof. The adhesion portion and the immunoglobulin sequence portion of the immunoadhesin may be linked by a minimal linker. The immunoglobulin sequence typically, but not necessarily, is an immunoglobulin constant domain. The immunoglobulin moiety in the chimeras of the present invention may be obtained from IgGl, IgG2, IgG3 or IgG4 subtypes, IgA, IgE, IgD or IgM, but typically IgGl or IgG3.
The polypeptides of the invention, fragments thereof and fusion proteins (e.g. immunoadhesin) according to the invention can exhibit post-translational modifications, including, but not limited to glycosylations, (e.g., N-linked or O-linked glycosylations), myristylations, palmitylations, acetylations and phosphorylations (e.g., serine/threonine or tyrosine).
In specific embodiments, it is contemplated that polypeptides used in the therapeutic methods of the present invention may be modified in order to improve their therapeutic efficacy. Such modification of therapeutic compounds may be used to decrease toxicity, increase circulatory time, or modify biodistribution. For example, the toxicity of potentially important therapeutic compounds can be decreased significantly by combination with a variety of drug carrier vehicles that modify biodistribution. In example adding dipeptides can improve the penetration of a circulating agent in the eye through the blood retinal barrier by using endogenous transporters.
A strategy for improving drug viability is the utilization of water-soluble polymers. Various water-soluble polymers have been shown to modify biodistribution, improve the
mode of cellular uptake, change the permeability through physiological barriers; and modify the rate of clearance from the body. To achieve either a targeting or sustained-release effect, water-soluble polymers have been synthesized that contain drug moieties as terminal groups, as part of the backbone, or as pendent groups on the polymer chain.
Polyethylene glycol (PEG) has been widely used as a drug carrier, given its high degree of biocompatibility and ease of modification. Attachment to various drugs, proteins, and liposomes has been shown to improve residence time and decrease toxicity. PEG can be coupled to active agents through the hydroxyl groups at the ends of the chain and via other chemical methods; however, PEG itself is limited to at most two active agents per molecule. In a different approach, copolymers of PEG and amino acids were explored as novel biomaterials which would retain the biocompatibility properties of PEG, but which would have the added advantage of numerous attachment points per molecule (providing greater drug loading), and which could be synthetically designed to suit a variety of applications.
Those of skill in the art are aware of PEGylation techniques for the effective modification of drugs. For example, drug delivery polymers that consist of alternating polymers of PEG and tri-functional monomers such as lysine have been used by VectraMed (Plainsboro, N.J.). The PEG chains (typically 2000 daltons or less) are linked to the a- and e- amino groups of lysine through stable urethane linkages. Such copolymers retain the desirable properties of PEG, while providing reactive pendent groups (the carboxylic acid groups of lysine) at strictly controlled and predetermined intervals along the polymer chain. The reactive pendent groups can be used for derivatization, cross-linking, or conjugation with other molecules. These polymers are useful in producing stable, long-circulating pro-drugs by varying the molecular weight of the polymer, the molecular weight of the PEG segments, and the cleavable linkage between the drug and the polymer. The molecular weight of the PEG segments affects the spacing of the drug/linking group complex and the amount of drug per molecular weight of conjugate (smaller PEG segments provides greater drug loading). In general, increasing the overall molecular weight of the block co-polymer conjugate will increase the circulatory half-life of the conjugate. Nevertheless, the conjugate must either be readily degradable or have a molecular weight below the threshold-limiting glomular filtration (e.g., less than 60 kDa).
In addition, to the polymer backbone being important in maintaining circulatory half- life, and biodistribution, linkers may be used to maintain the therapeutic agent in a pro-drug form until released from the backbone polymer by a specific trigger, typically enzyme activity in the targeted tissue. For example, this type of tissue activated drug delivery is particularly useful where delivery to a specific site of biodistribution is required and the therapeutic agent is released at or near the site of pathology. Linking group libraries for use in activated drug delivery are known to those of skill in the art and may be based on enzyme kinetics, prevalence of active enzyme, and cleavage specificity of the selected disease-specific enzymes. Such linkers may be used in modifying the protein or fragment of the protein described herein for therapeutic delivery.
In one embodiment, the OX1R agonist is an aptamer. Aptamers are a class of molecule that represents an alternative to antibodies in term of molecular recognition. Aptamers are oligonucleotide or oligopeptide sequences with the capacity to recognize virtually any class of target molecules with high affinity and specificity. Such ligands may be isolated through Systematic Evolution of Ligands by Exponential enrichment (SELEX) of a random sequence library. The random sequence library is obtainable by combinatorial chemical synthesis of DNA. In this library, each member is a linear oligomer, eventually chemically modified, of a unique sequence. Peptide aptamers consists of a conformationally constrained antibody variable region displayed by a platform protein, such as E. coli Thioredoxin A that are selected from combinatorial libraries by two hybrid methods.
The term "pancreatic cancer" or "pancreas cancer" as used herein relates to cancer which is derived from pancreatic cells. In particular, pancreatic cancer included pancreatic adenocarcinoma (e.g., pancreatic ductal adenocarcinoma) as well as other tumors of the exocrine pancreas (e.g., serous cystadenomas), acinar cell cancers, intraductal papillary mucinous neoplasms (IPMN) and pancreatic neuroendocrine tumors (such as insulinomas).
In some embodiments, the OX1R agonist of the invention is administered to the subject with a therapeutically effective amount.
By a "therapeutically effective amount" is meant a sufficient amount of OX1R to treat pancreatic cancer at a reasonable benefit/risk ratio applicable to any medical treatment. It will be understood that the total daily usage of the compounds and compositions of the present
invention will be decided by the attending physician within the scope of sound medical judgment. The specific therapeutically effective dose level for any particular subject will depend upon a variety of factors including the disorder being treated and the severity of the disorder; activity of the specific compound employed; the specific composition employed, the age, body weight, general health, sex and diet of the subject; the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coincidental with the specific polypeptide employed; and like factors well known in the medical arts. For example, it is well within the skill of the art to start doses of the compound at levels lower than those required to achieve the desired therapeutic effect and to gradually increase the dosage until the desired effect is achieved. However, the daily dosage of the products may be varied over a wide range from 0.01 to 1,000 mg per adult per day. In particular, the compositions contain 0.01, 0.05, 0.1, 0.5, 1.0, 2.5, 5.0, 10.0, 15.0, 25.0, 50.0, 100, 250 and 500 mg of the active ingredient for the symptomatic adjustment of the dosage to the subject to be treated. A medicament typically contains from about 0.01 mg to about 500 mg of the active ingredient, in particular from 1 mg to about 100 mg of the active ingredient. An effective amount of the drug is ordinarily supplied at a dosage level from 0.0002 mg/kg to about 20 mg/kg of body weight per day, especially from about 0.001 mg/kg to 7 mg/kg of body weight per day. The OX1R agonist of the invention may be combined with pharmaceutically acceptable excipients, and optionally sustained-release matrices, such as biodegradable polymers, to form therapeutic compositions.
"Pharmaceutically" or "pharmaceutically acceptable" refers to molecular entities and compositions that do not produce an adverse, allergic or other untoward reaction when administered to a mammal, especially a human, as appropriate. A pharmaceutically acceptable carrier or excipient refers to a non-toxic solid, semi- solid or liquid filler, diluent, encapsulating material or formulation auxiliary of any type. In the pharmaceutical compositions of the present invention for oral, sublingual, subcutaneous, intramuscular, intravenous, transdermal, local or rectal administration, the active principle, alone or in combination with another active principle, can be administered in a unit administration form, as a mixture with conventional pharmaceutical supports, to animals and human beings. Suitable unit administration forms comprise oral-route forms such
as tablets, gel capsules, powders, granules and oral suspensions or solutions, sublingual and buccal administration forms, aerosols, implants, subcutaneous, transdermal, topical, intraperitoneal, intramuscular, intravenous, subdermal, transdermal, intrathecal and intranasal administration forms and rectal administration forms.
In particular, the pharmaceutical compositions contain vehicles which are pharmaceutically acceptable for a formulation capable of being injected. These may be in particular isotonic, sterile, saline solutions (monosodium or disodium phosphate, sodium, potassium, calcium or magnesium chloride and the like or mixtures of such salts), or dry, especially freeze-dried compositions which upon addition, depending on the case, of sterilized water or physiological saline, permit the constitution of injectable solutions.
The pharmaceutical forms suitable for injectable use include sterile aqueous solutions or dispersions; formulations including sesame oil, peanut oil or aqueous propylene glycol ; and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersions. In all cases, the form must be sterile and must be fluid to the extent that easy syringability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms, such as bacteria and fungi.
Solutions comprising compounds of the invention as free base or pharmacologically acceptable salts can be prepared in water suitably mixed with a surfactant, such as hydroxypropylcellulose. Dispersions can also be prepared in glycerol, liquid polyethylene glycols, and mixtures thereof and in oils. Under ordinary conditions of storage and use, these preparations contain a preservative to prevent the growth of microorganisms.
The OX1R agonist of the invention can 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 which 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 ferric hydroxides, and such organic bases as isopropylamine, trimethylamine, histidine, procaine and the like.
The carrier can also be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), suitable mixtures thereof, and vegetables oils. The proper fluidity can be maintained, for example, by the use of a coating, such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants. The prevention of the action of microorganisms can be brought about by various antibacterial and antifuCASK agents, for example, parabens, chlorobutanol, phenol, sorbic acid, thimerosal, and the like. In many cases, it will be preferable to include isotonic agents, for example, sugars or sodium chloride. Prolonged absorption of the injectable compositions can be brought about by the use in the compositions of agents delaying absorption, for example, aluminium monostearate and gelatin.
Sterile injectable solutions are prepared by incorporating the active polypeptides in the required amount in the appropriate solvent with various of the other ingredients enumerated above, as required, followed by filtered sterilization. Generally, dispersions are prepared by incorporating the various sterilized active ingredients into a sterile vehicle which contains the basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum-drying and freeze-drying techniques which yield a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.
Upon formulation, solutions will be administered in a manner compatible with the dosage formulation and in such amount as is therapeutically effective. The formulations are easily administered in a variety of dosage forms, such as the type of injectable solutions described above, but drug release capsules and the like can also be employed.
For parenteral administration in an aqueous solution, for example, the solution should be suitably buffered if necessary and the liquid diluent first rendered isotonic with sufficient saline or glucose. These particular aqueous solutions are especially suitable for intravenous, intramuscular, subcutaneous and intraperitoneal administration. In this connection, sterile aqueous media which can be employed will be known to those of skill in the art in light of the present disclosure. For example, one dosage could be dissolved in 1 ml of isotonic NaCl
solution and either added to 1000 ml of hypodermoclysis fluid or injected at the proposed site of infusion. Some variation in dosage will necessarily occur depending on the condition of the subject being treated. The person responsible for administration will, in any event, determine the appropriate dose for the individual subject.
The OX1R agonist of the invention may be formulated within a therapeutic mixture to comprise about 0.0001 to 1.0 milligrams, or about 0.001 to 0.1 milligrams, or about 0.1 to 1.0 or even about 10 milligrams per dose or so. Multiple doses can also be administered. In addition to the compounds of the invention formulated for parenteral administration, such as intravenous or intramuscular injection, other pharmaceutically acceptable forms include, e.g. tablets or other solids for oral administration; liposomal formulations ; time release capsules ; and any other form currently used. In some embodiments, the OX1R agonist of the invention is used in combination with a chemotherapeutic agent. Chemotherapeutic agents include, but are not limited to alkylating agents such as thiotepa and cyclosphosphamide; alkyl sulfonates such as busulfan, improsulfan and piposulfan; aziridines such as benzodopa, carboquone, meturedopa, and uredopa; ethylenimines and methylamelamines including altretamine, triethylenemelamine, trietylenephosphoramide, triethiylenethiophosphoramide and trimethylolomelamine; acetogenins (especially bullatacin and bullatacinone); a camptothecin (including the synthetic analogue topotecan); bryostatin; callystatin; CC-1065 (including its adozelesin, carzelesin and bizelesin synthetic analogues); cryptophycins (particularly cryptophycin 1 and cryptophycin 8); dolastatin; duocarmycin (including the synthetic analogues, KW-2189 and CB1-TM1); eleutherobin; pancratistatin; a sarcodictyin; spongistatin; nitrogen mustards such as chlorambucil, chlornaphazine, cholophosphamide, estramustine, ifosfamide, mechlorethamine, mechlorethamine oxide hydrochloride, melphalan, novembichin, phenesterine, prednimustine, trofosfamide, uracil mustard; nitrosureas such as carmustine, chlorozotocin, fotemustine, lomustine, nimustine, and ranimnustine; antibiotics such as the enediyne antibiotics (e. g. , calicheamicin, especially calicheamicin gammall and calicheamicin omegall ; dynemicin, including dynemicin A; bisphosphonates, such as clodronate; an esperamicin; as well as neocarzinostatin chromophore and related chromoprotein enediyne antiobiotic chromophores, aclacinomysins, actinomycin, authrarnycin, azaserine, bleomycins, cactinomycin, carabicin, caminomycin, carzinophilin,
chromomycinis, dactinomycin, daunorubicin, detorubicin, 6-diazo-5-oxo-L-norleucine, doxorubicin (including morpholino-doxorubicin, cyanomorpholino-doxorubicin, 2-pyrrolino- doxorubicin and deoxy doxorubicin), epirubicin, esorubicin, idarubicin, marcellomycin, mitomycins such as mitomycin C, mycophenolic acid, nogalamycin, olivomycins, peplomycin, potfiromycin, puromycin, quelamycin, rodorubicin, streptonigrin, streptozocin, tubercidin, ubenimex, zinostatin, zorubicin; anti-metabolites such as methotrexate and 5- fluorouracil (5-FU); folic acid analogues such as denopterin, methotrexate, pteropterin, trimetrexate; purine analogs such as fludarabine, 6-mercaptopurine, thiamiprine, thioguanine; pyrimidine analogs such as ancitabine, azacitidine, 6-azauridine, carmofur, cytarabine, dideoxyuridine, doxifluridine, enocitabine, floxuridine; androgens such as calusterone, dromostanolone propionate, epitiostanol, mepitiostane, testolactone; anti-adrenals such as aminoglutethimide, mitotane, trilostane; folic acid replenisher such as frolinic acid; aceglatone; aldophosphamide glycoside; aminolevulinic acid; eniluracil; amsacrine; bestrabucil; bisantrene; edatraxate; defofamine; demecolcine; diaziquone; elformithine; elliptinium acetate; an epothilone; etoglucid; gallium nitrate; hydroxyurea; lentinan; lonidainine; maytansinoids such as maytansine and ansamitocins; mitoguazone; mitoxantrone; mopidanmol; nitraerine; pentostatin; phenamet; pirarubicin; losoxantrone; podophyllinic acid; 2-ethylhydrazide; procarbazine; PSK polysaccharide complex); razoxane; rhizoxin; sizofuran; spirogermanium; tenuazonic acid; triaziquone; 2,2',2"-trichlorotriethylamine; trichothecenes (especially T-2 toxin, verracurin A, roridin A and anguidine); urethan; vindesine; dacarbazine; mannomustine; mitobronitol; mitolactol; pipobroman; gacytosine; arabinoside ("Ara-C"); cyclophosphamide; thiotepa; taxoids, e.g., paclitaxel and doxetaxel; chlorambucil; gemcitabine; 6-thioguanine; mercaptopurine; methotrexate; platinum coordination complexes such as cisplatin, oxaliplatin and carboplatin; vinblastine; platinum; etoposide (VP- 16); ifosfamide; mitoxantrone; vincristine; vinorelbine; novantrone; teniposide; edatrexate; daunomycin; aminopterin; xeloda; ibandronate; irinotecan (e.g., CPT-1 1); topoisomerase inhibitor RFS 2000; difluoromethylomithine (DMFO); retinoids such as retinoic acid; capecitabine; and pharmaceutically acceptable salts, acids or derivatives of any of the above. A further object of the invention relates to a method for treating a pancreatic cancer in a subject in thereof comprising the steps consisting of i) determining the expression level of OXIR in a tumour tissue sample obtained from the subject, ii) comparing the expression level determined at step i) with a reference value and iii) administering the subj ect with a
therapeutically effective amount of an OX1R agonist when the level determined at step i) is higher than the reference value.
The expression level of OX1R may be determined by any well known method in the art. For example methods for determining the quantity of mRNA are well known in the art. Typically the nucleic acid contained in the samples (e.g., cell or tissue prepared from the patient) is first extracted according to standard methods, for example using lytic enzymes or chemical solutions or extracted by nucleic-acid-binding resins following the manufacturer's instructions. The extracted mRNA is then detected by hybridization (e. g., Northern blot analysis) and/or amplification (e.g., RT-PCR). Preferably quantitative or semi-quantitative RT-PCR is preferred. Real-time quantitative or semi-quantitative RT-PCR is particularly advantageous. Alternatively an immunohistochemistry (IHC) method may be used. IHC specifically provides a method of detecting targets in a sample or tissue specimen in situ. The overall cellular integrity of the sample is maintained in IHC, thus allowing detection of both the presence and location of the targets of interest (i.e. OX1R). Typically a sample is fixed with formalin, embedded in paraffin and cut into sections for staining and subsequent inspection by light microscopy. Current methods of IHC use either direct labeling or secondary antibody-based or hapten-based labeling. Examples of known IHC systems include, for example, EnVision(TM) (DakoCytomation), Powervision(R) (Immunovision, Springdale, AZ), the NBA(TM) kit (Zymed Laboratories Inc., South San Francisco, CA), HistoFine(R) (Nichirei Corp, Tokyo, Japan). In particular embodiment, a tumor tissue section may be mounted on a slide or other support after incubation with antibodies directed against OX1R. Then, microscopic inspections in the sample mounted on a suitable solid support may be performed. For the production of photomicrographs, sections comprising samples may be mounted on a glass slide or other planar support, to highlight by selective staining the presence of the proteins of interest.
A "reference value" can be a "threshold value" or a "cut-off value". Typically, a "threshold value" or "cut-off value" can be determined experimentally, empirically, or theoretically. A threshold value can also be arbitrarily selected based upon the existing experimental and/or clinical conditions, as would be recognized by a person of ordinary skilled in the art. The threshold value has to be determined in order to obtain the optimal sensitivity and specificity according to the function of the test and the benefit/risk balance (clinical consequences of false positive and false negative). Typically, the optimal sensitivity
and specificity (and so the threshold value) can be determined using a Receiver Operating Characteristic (ROC) curve based on experimental data. Typically, the threshold value is derived from the OXIR expression level (or ratio, or score) determined in a tumor tissue sample derived from one or more subjects having sufficient amount of OXIR level to get an efficient treatment with the OXIR agonist. Furthermore, retrospective measurement of the OXIR expression levels (or ratio, or scores) in properly banked historical subject samples may be used in establishing these threshold values.
A further object of the invention relates to a method for screening a drug for the treatment of pancreatic cancer comprising the steps of i) providing a plurality of test substances ii) determining whether the test substances are OXIR agonists and iii) positively selecting the test substances that are OXIR agonists.
Typically, the screening method of the invention involves providing appropriate cells which express the orexin- 1 receptor on their surface. Such cells include cells from mammals, yeast, Drosophila or E. coli. In particular, a polynucleotide encoding the orexin- 1 receptor is used to transfect cells to express the receptor. The expressed receptor is then contacted with a test substance and an orexin- 1 receptor ligand (e.g. orexins), as appropriate, to observe activation of a functional response such as recruitment of SHP-2 and induction of cell apoptosis of the cell. Functional assays may be performed as described in El Firar A, Voisin T, Rouyer-Fessard C, Ostuni MA, Couvineau A, Laburthe M. Discovery of a functional immunoreceptor tyrosine-based switch motif in a 7-transmembrane-spanning receptor: role in the orexin receptor OXIR-driven apoptosis. FASEB J. 2009 Dec;23(12):4069-80. doi: 10.1096/fj.09-131367. Epub 2009 Aug 6. In particular comparison steps may involve to compare the activity induced by the test substance and the activity induce by a well known OXIR agonist such as orexin. In particular substances capable of having an activity similar or even better than a well known OXIR agonist are positively selected.
Typically, the screening method of the invention may also involve screening for test substances capable of binding of to orexin-1 receptor present at cell surface. Typically the test substance is labelled (e.g. with a radioactive label) and the binding is compared to a well known OXIR agonist such as orexin. The preparation is incubated with labelled OXIR and complexes of test substances bound to NGAL are isolated and characterized according to routine methods known in the art. Alternatively, the OXIR may be bound to a solid support
so that binding molecules solubilized from cells are bound to the column and then eluted and characterized according to routine methods. In another embodiment, a cellular compartment may be prepared from a cell that expresses a molecule that binds NGAL such as a molecule of a signalling or regulatory pathway modulated by NGAL. The preparation is incubated with labelled NGAL in the absence or the presence of a candidate compound. The ability of the candidate compound to bind the binding molecule is reflected in decreased binding of the labelled ligand.
Typically, the candidate compound is selected from the group consisting of small organic molecules, peptides, polypeptides or oligonucleotides.
The test substances that have been positively selected may be subjected to further selection steps in view of further assaying its properties for the treatment of pancreatic cancer. For example, the candidate compounds that have been positively selected may be subjected to further selection steps in view of further assaying its properties on animal models for pancreatic cancer.
The above assays may be performed using high throughput screening techniques for identifying test substances for developing drugs that may be useful to the treatment of pancreatic cancer. High throughput screening techniques may be carried out using multi-well plates (e.g., 96-, 389-, or 1536-well plates), in order to carry out multiple assays using an automated robotic system. Thus, large libraries of test substances may be assayed in a highly efficient manner. More particularly, stably-transfected cells growing in wells of micro-titer plates (96 well or 384 well) can be adapted to high through-put screening of libraries of compounds. Compounds in the library will be applied one at a time in an automated fashion to the wells of the microtitre dishes containing the transgenic cells described above. Once the test substances which activate the apoptotic signals are identified, they can be positively sleeted fro further characterization. These assays offer several advantages. The exposure of the test substance to a whole cell allows for the evaluation of its activity in the natural context in which the test substance may act. Because this assay can readily be performed in a microtitre plate format, the assays described can be performed by an automated robotic system, allowing for testing of large numbers of test samples within a reasonably short time frame. The assays of the invention can be used as a screen to assess the activity of a previously untested compound or extract, in which case a single concentration is tested and
compared to controls. These assays can also be used to assess the relative potency of a compound by testing a range of concentrations, in a range of 100 μΜ to 1 μΜ, for example, and computing the concentration at which the apoptosis is maximal. The invention will be further illustrated by the following figures and examples.
However, these examples and figures should not be interpreted in any way as limiting the scope of the present invention.
FIGURES:
Figure 1 shows tumoral reduction induced by orexin-A injection in nude mice xenografted with AsPC-1 cells.
EXAMPLE:
Orexins are hypothalamic peptides involved in sleep/wake control. We have shown that orexins promote robust apoptosis in colorectal cancer cells. The cell death is mediated by the orexin 1 receptor (OXIR) through an original mechanism involving the presence of two ITIMs (immunoreceptor tyrosine inhibitory motif) in the OXIR sequence and the recruitment and activation of the tyrosine phosphatase SHP-2. OXIR, a class I GPCR, is aberrantly expressed in primary colorectal tumors and liver metastases. Pancreatic ductal adenocarcinomas (PAC) are highly malignant neoplasms with poor prognosis. Chemotherapy treatment shows a poor response rate. We have demonstrated the expression of OXIR in a large percentage of pancreatic adenocarcinomas by immunohistochemistry suggesting the ectopic OXIR expression in 98% of tested PAC.
The aims of this study were: 1/ to investigate the presence of OXIR in human PAC cell lines and to analyze orexin-A effects in relation to apoptosis; 21 to develop an in vivo heterotopic xenograft model from the cell lines expressing OXIR, for the study of tumor growth in response to Orexin-A. The expression of OXIR was studied at mRNA (RT-PCR), proteins (immunocytochemistry) and functional levels in 3 PAC cell lines (AsPC-1, HPAF-II and SW1990). The development of an animal model (heterotopic xenograft) from the cell line expressing OXIR, has allowed studying the effect of Orexin-A in tumor growth. Resected tumors were analyzed by immunohistochemistry. Only AsPC-1 cell line expresses OXIR.
The treatment with Orexin-A promoted a 32% cell growth inhibition by promoting a mitochondrial apoptosis. Using the SHP inhibitor NSC-87877, we demonstrated the ability of the inhibitor to reverse orexin-induced apoptosis in AsPC-1 cells. Orexin-A injection in nude mice xenografted with AsPC-1 cells, has declined 49% of tumor progression in treated cases. All the tumors corresponded to poorly differentiated adenocarcinomas expressing cytokeratin 7, CA9 (hypoxia marker) and OX1R. Induction of apoptosis was observed in Orexin-A treated tumors (activated caspase-3).
In conclusion this work has demonstrated the antitumor and proapoptotic effects of orexins in PAC. In this context, orexin receptors represent a new promising target in pancreatic antineoplastic therapy and/or preclinical diagnostic.
REFERENCES:
Throughout this application, various references describe the state of the art to which this invention pertains. The disclosures of these references are hereby incorporated by reference into the present disclosure.
Claims
1. A method for the treatment of pancreatic cancer in a subject in need thereof comprising administering the subject with a therapeutically effective amount of an OXIR agonist.
2. The method of claim 1 wherein the OXIR agonist is a small organic molecule.
3. The method of claim 1 wherein the OXIR agonist is an antibody.
4. The method of claim 1 wherein the OXIR agonist is selected from the group consisting of chimeric antibodies, humanized antibodies or full human monoclonal antibodies.
5. The method of claim 1 wherein the OXIR agonist is a polypeptide.
6. The method of claim 1 wherein the OXIR agonist is a functional equivalent of Orexin-A or Orexin-B.
7. The method of claim 1 wherein the OXIR agonist is a polypeptide having at least 80% of identity with SEQ ID NO:2 or 3.
8. The method of claim 1 wherein the OXIR agonist is a immunoadhesin.
9. The method of claim 1 wherein the OXIR is an aptamer.
10. The method of claim 1 wherein the pancreatic cancer is selected from the group consisting of pancreatic adenocarcinoma such as pancreatic ductal adenocarcinoma and other tumors of the exocrine pancreas such as serous cystadenomas, acinar cell cancers, intraductal papillary mucinous neoplasms (IPMN) and pancreatic neuroendocrine tumors such as insulinomas.
11. The method of cl aim 1 wherein the subj ect i s al so admini stered with a chemotherapeutic agent.
12. A method for treating a pancreatic cancer in a subject in thereof comprising the steps consisting of i) determining the expression level of OXIR in a tumour tissue sample obtained from the subject, ii) comparing the expression level determined at step i) with
a reference value and iii) administering the subject with a therapeutically effective amount of an OXIR agonist when the level determined at step i) is higher than the reference value.
13. A method for screening a drug for the treatment of pancreatic cancer comprising the steps of i) providing a plurality of test substances ii) determining whether the test substances are OXIR agonists and iii) positively selecting the test substances that are OXIR agonists.
Applications Claiming Priority (1)
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PCT/IB2013/002727 WO2015071701A1 (en) | 2013-11-15 | 2013-11-15 | Methods and pharmaceutical compositions for the treatment of pancreatic cancers |
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EP (1) | EP3068419A1 (en) |
JP (1) | JP2016538286A (en) |
WO (1) | WO2015071701A1 (en) |
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EP3096772B1 (en) * | 2014-01-22 | 2018-12-26 | INSERM (Institut National de la Santé et de la Recherche Médicale) | Methods and pharmaceutical compositions for the treatment of hepatocellular carcinomas |
WO2016131928A1 (en) * | 2015-02-19 | 2016-08-25 | INSERM (Institut National de la Santé et de la Recherche Médicale) | Orexin-b polypeptides and uses thereof |
US20210188983A1 (en) * | 2016-02-18 | 2021-06-24 | Universite De Montpellier | Polypeptides for preparing drug conjugates capable of promoting apoptosis in a cell expressing an orexin receptor |
WO2017178404A1 (en) * | 2016-04-11 | 2017-10-19 | INSERM (Institut National de la Santé et de la Recherche Médicale) | Combination therapies for the treatment of pancreatic cancer |
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US4816567A (en) | 1983-04-08 | 1989-03-28 | Genentech, Inc. | Recombinant immunoglobin preparations |
US5225539A (en) | 1986-03-27 | 1993-07-06 | Medical Research Council | Recombinant altered antibodies and methods of making altered antibodies |
US5567610A (en) | 1986-09-04 | 1996-10-22 | Bioinvent International Ab | Method of producing human monoclonal antibodies and kit therefor |
GB8823869D0 (en) | 1988-10-12 | 1988-11-16 | Medical Res Council | Production of antibodies |
US5175384A (en) | 1988-12-05 | 1992-12-29 | Genpharm International | Transgenic mice depleted in mature t-cells and methods for making transgenic mice |
IL162181A (en) | 1988-12-28 | 2006-04-10 | Pdl Biopharma Inc | A method of producing humanized immunoglubulin, and polynucleotides encoding the same |
US5530101A (en) | 1988-12-28 | 1996-06-25 | Protein Design Labs, Inc. | Humanized immunoglobulins |
US5859205A (en) | 1989-12-21 | 1999-01-12 | Celltech Limited | Humanised antibodies |
US6150584A (en) | 1990-01-12 | 2000-11-21 | Abgenix, Inc. | Human antibodies derived from immunized xenomice |
US5229275A (en) | 1990-04-26 | 1993-07-20 | Akzo N.V. | In-vitro method for producing antigen-specific human monoclonal antibodies |
US5545806A (en) | 1990-08-29 | 1996-08-13 | Genpharm International, Inc. | Ransgenic non-human animals for producing heterologous antibodies |
ES2136092T3 (en) | 1991-09-23 | 1999-11-16 | Medical Res Council | PROCEDURES FOR THE PRODUCTION OF HUMANIZED ANTIBODIES. |
US5573905A (en) | 1992-03-30 | 1996-11-12 | The Scripps Research Institute | Encoded combinatorial chemical libraries |
EP0690452A3 (en) | 1994-06-28 | 1999-01-07 | Advanced Micro Devices, Inc. | Electrically erasable memory and method of erasure |
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- 2013-11-15 WO PCT/IB2013/002727 patent/WO2015071701A1/en active Application Filing
- 2013-11-15 EP EP13836207.4A patent/EP3068419A1/en not_active Withdrawn
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JP2016538286A (en) | 2016-12-08 |
WO2015071701A1 (en) | 2015-05-21 |
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