WO1993020221A1 - Gene therapy using targeted viral vectors - Google Patents
Gene therapy using targeted viral vectors Download PDFInfo
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- WO1993020221A1 WO1993020221A1 PCT/US1993/002957 US9302957W WO9320221A1 WO 1993020221 A1 WO1993020221 A1 WO 1993020221A1 US 9302957 W US9302957 W US 9302957W WO 9320221 A1 WO9320221 A1 WO 9320221A1
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
- C12N15/86—Viral vectors
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- C12N2740/00—Reverse transcribing RNA viruses
- C12N2740/00011—Details
- C12N2740/10011—Retroviridae
- C12N2740/13011—Gammaretrovirus, e.g. murine leukeamia virus
- C12N2740/13041—Use of virus, viral particle or viral elements as a vector
- C12N2740/13043—Use of virus, viral particle or viral elements as a vector viral genome or elements thereof as genetic vector
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- C12N2740/00011—Details
- C12N2740/10011—Retroviridae
- C12N2740/13011—Gammaretrovirus, e.g. murine leukeamia virus
- C12N2740/13041—Use of virus, viral particle or viral elements as a vector
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- C12N2810/00—Vectors comprising a targeting moiety
- C12N2810/50—Vectors comprising as targeting moiety peptide derived from defined protein
- C12N2810/80—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates
- C12N2810/85—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian
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- C12N2810/00—Vectors comprising a targeting moiety
- C12N2810/50—Vectors comprising as targeting moiety peptide derived from defined protein
- C12N2810/80—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates
- C12N2810/85—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian
- C12N2810/855—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian from receptors; from cell surface antigens; from cell surface determinants
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- C12N2810/00—Vectors comprising a targeting moiety
- C12N2810/50—Vectors comprising as targeting moiety peptide derived from defined protein
- C12N2810/80—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates
- C12N2810/85—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian
- C12N2810/855—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian from receptors; from cell surface antigens; from cell surface determinants
- C12N2810/856—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian from receptors; from cell surface antigens; from cell surface determinants from integrins
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- C12N2810/00—Vectors comprising a targeting moiety
- C12N2810/50—Vectors comprising as targeting moiety peptide derived from defined protein
- C12N2810/80—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates
- C12N2810/85—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian
- C12N2810/859—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian from immunoglobulins
Definitions
- Gene therapy is an approach to treating a broad range of diseases by delivering therapeutic genes directly into the human body.
- Diseases that can potentially be cured by gene therapy include 1) diseases associated with the aging population such as cancer, heart disease, Alzheimer's disease, high blood pressure, atherosclerosis and arthritis; 2) viral infectious diseases such as acquired immune deficiency syndrome (AIDS) and herpes; and 3) inherited diseases such as diabetes, hemophilia, cystic fibrosis, and muscular dystrophy.
- diseases associated with the aging population such as cancer, heart disease, Alzheimer's disease, high blood pressure, atherosclerosis and arthritis
- viral infectious diseases such as acquired immune deficiency syndrome (AIDS) and herpes
- AIDS acquired immune deficiency syndrome
- herpes and 3) inherited diseases such as diabetes, hemophilia, cystic fibrosis, and muscular dystrophy.
- a favored approach for human gene therapy involves the transplantation of genetically-altered cells into patients (Rosenberg, et al., 1988, New Eng J Medicine 311:570-578).
- This approach requires the surgical removal of cells from each patient to isolate target cells from nontarget cells. Genes are introduced into these cells via viral vectors or other means, followed by transplantation of the genetically-altered cells back into the patient.
- transplantation strategies are less likely to be suitable for treating diseases such as cystic fibrosis or cancer, where the diseased cells themselves must be corrected.
- Double balloon catheterization transduces genes into cells within a defined arterial wall segment.
- a double balloon catheter is inserted into an artery until the end of the catheter is located within the target area.
- Inflation of two balloons at the end of the catheter creates an enclosed space into which retrovirus or DNA-loaded liposomes are infused.
- This method has been successful in the transient expression of ⁇ -galactosidase genes within a defined segment of the ileofemoral artery of pigs (Nabel E.G., et al., 1990, Science 249:1285-1288) .
- biolistic transfer and double balloon catheterization although locally specific, may be nonspecific in the individual cells that they transduce within the target area, creating a problem of inappropriate gene regulation if the transgene is expressed in nontarget cells.
- biolistic transfer nor double balloon catheterization have been shown to be effective for the treatment of tissue occupying large volumes such as lungs, muscles, tumors, or cells of the systemic circulation since the majority of the cells would be inaccessible for in situ gene transfer.
- a third approach to gene therapy is the delivery of genes to cells in vivo.
- This approach involves the introduction of viral vectors directly into patients by injection, spray or other means.
- Different species of viruses are engineered to deliver genes to the cells that the viruses normally infect.
- Adenovirus for example, which normally infects lung cells, has been developed as a vector to target genes to lung cells (Rosenfield, et al., 1992, Cell .68.143-155).
- Most viral vectors are single purpose vectors since they can only deliver genes to certain cells. Because the target cell specificity of viral vectors is restricted to the normal tropisms of the viruses, viral vectors are generally limited in that they either infect too broad a range of cell types, or they db not infect certain types of cells at all.
- Liposomes have been designed to deliver genes or drugs to specific target cells in vivo. By chemically conjugating antibodies or ligands to liposomes, liposomes have been targeted to specific cells.
- antisense env RNA has been delivered to human immunodeficiency virus (HIV)-infected lymphocytes using anti-CD3-conjugated liposomes (Renneisen, K., et al. , 1990, J Biol Chem 265:16337-16342): chloramphenicol transacetylase (CAT) genes have been delivered to H2K k positive lymphomas in H2K k -negative nude mice using anti- H2 k -conjugated liposomes (Wang, C.
- HV human immunodeficiency virus
- CAT chloramphenicol transacetylase
- XGPRT xanthine guanine phosphoribosyltransferase
- Wu et al. report a method to target naked DNA to specific cells. Asialoglycoprotein-DNA complexes are targeted to hepatocytes expressing the asialoglycoprotein receptor (Wu G.Y., et al., 1991, Biotherapy 3.:87-95). Similar to the problem encountered with immunotoxins, however, this strategy generally limits delivery of DNA to cells expressing receptors that are capable of DNA- internalization.
- Antisense DNA technology is a method for inhibiting the expression of specific genes with complementary DNA (Moffat, 1991, Science 253:510-511) .
- antisense DNA is specific in the genes that it affects, it is nonspecific in the types of cells that it gets into. This can create problems in vivo because it is desirable that endogenous genes in normal cells remain unaffected by antisense DNA (e.g., protooncogenes) .
- the cost of manufacturing and administering antisense DNA may be high because the phosphate moieties of antisense DNA must be chemically modified to allow passage through the plasma membrane, a process which entails expensive organic chemistry.
- Millimolar concentrations of antisense DNA are required to be effective, posing problems of potential toxicity in vivo.
- Human gene therapy is therefore limited by-the available technology for gene delivery.
- Transplantation strategies which require surgery, limit gene therapy to an expensive service industry for a small number of diseases.
- Targeting of genes in situ through local transduction is generally not precise enough.
- Viral vectors limit the delivery of genes in vivo to cells that the viruses normally infect. Liposome technologies may be infeasible because of the expense of production. Simple ligand-DNA complexes will not introduce genes into cells unless the receptors, against which the ligands are directed, internalize. Accordingly, currently available gene delivery systems impose severe limitations on the spectrum of diseases that can be treated by gene therapy. Summary of the Invention
- the invention features a method for expressing a nucleic acid of interest in a heterologous host cell.
- the method involves providing a virus whose genome comprises i) the nucleic acid of interest, and ii) a hybrid envelope gene.
- the hybrid gene encodes an envelope fragment joined to a targeting ligand, whereby the envelope fragment does not facilitate recognition or binding of its normal host cell but does facilitate efficient incorporation of the virus into a mature viral particle, and whereby the targeting ligand facilitates targeting and binding of the mature viral particle to the surface of the heterologous host cell.
- the method also involves administering the virus so as to permit viral infection of the cell.
- the invention features a. virus, the genome of which encodes a hybrid envelope protein, wherein the hybrid protein comprises an envelope fragment joined in frame to a targeting ligand, whereby the envelope fragment does not facilitate recognition or binding of its normal host cell but which does facilitate efficient incorporation of the hybrid envelope protein into a mature viral particle and whereby the non-viral protein facilitates targeting and binding of the mature viral particle to the surface of a cell not normally infected by the virus.
- the invention features a method for % delivering a nucleic acid of interest to a heterologous host cell.
- the method involves providing a virus that comprises i) the nucleic acid of interest, and ii) a hybrid envelope gene, the hybrid gene encoding an envelope fragment joined to a targeting ligand, whereby the envelope fragment does not facilitate recognition or binding to its normal host cell but does facilitate efficient incorporation of the virus into a mature viral particle, and whereby the targeting ligand facilitates targeting and binding of the mature viral particle to the surface of the heterologous host cell.
- the method also involves administering the virus so as to permit viral infection of the cell.
- the virus is an enveloped virus, preferably a Herpesviridae, a Paramyxoviridae, or a Retroviridae, most preferably a Moloney murine leukemia virus, or the virus may also preferably be a Hepadnaviridae, a Poxviridae, or an
- the virus may be a Togaviridae, a Flaviviridae, a Coronaviridae, a Rhabodoviridae, a Filoviridae, an Orthomyxoviridae, a Bunyaviridae, or an Arenaviridae, or any other, yet unclassified, enveloped virus.
- the- nucleic acid of interest may include, without limitation, an antisense oncogene; a tumor suppressor gene, e.g., a gene encoding p53, or a gene encoding retinoblastoma protein Rb; a toxin gene, e.g., a diphtheria toxin gene; or a gene encoding a cytokine, e.g., a tumor necrosis factor, or an interferon.
- the nucleic acid of interest may be either DNA or RNA, e.g., antisense DNA, or antisense RNA, or a nucleic acid encoding an antisense RNA.
- the nucleic acid of interest may also be a gene invoking intracellular immunity, or a nucleic acid therapeutic for an inherited disease, e.g., an insulin gene, or a cystic fibrosis transmembrane regulator gene.
- a "gene that invokes intracellular immunity” is a gene that confers a dominant negative resistant phenotype to the cell it is in, thereby protecting the cell against an invading agent.
- the heterologous host cell may be a cell that has acquired mutations that result in a disease state, preferably a cancer cell, e.g., a colon cancer cell.
- the heterologous host cell may be a cell infected with a second virus, e.g., a human immunodeficiency virus (HIV), a cell infected with an organism, or an infectious agent such as a bacterium or parasite.
- the infectious agent may be either unicellular or multicellular.
- the heterologous host cell may also be a cell affected by a hereditary disease, e.g., a pancreatic beta cell, or a lung cell.
- the targeting ligand may include a protein, preferably a hormone, or an immunoglobulin, more preferably an anti- tumor associated antigen-specific immunoglobulin, most preferably an anti-carcinoembryonic antigen-specific immunoglobulin, or an anti-HIVgpl20 antigen-specific immunoglobulin.
- the targeting ligand may also be a carbohydrate, or a lipid.
- the hybrid envelope fragment may consist of a receptor binding domain, an oligomerization domain, a transmembrane domain, a virus budding domain, sorting signals, a signal sequence, and preferably a fusion domain. In some cases the fusion activity of the envelope fragment may be performed by a second protein.
- the second protein would therefore direct fusion of the virus with the membrane of the targeted cell.
- the mode of administration may include, but is not limited to, 1) direct injection of the purified virus; or 2) implanting a container enclosing the virus into a patient.
- the virus is preferably inside a packaging cell.
- a "packaging cell” is a cell that supplies viral proteins necessary for production of viral vectors.
- container is meant a virus permeable enclosure containing virus, or containing packaging cells with virus therein.
- Normal host cell as used herein, is a cell type commonly infected by the naturally occurring virus.
- heterologous host cell or a “targeted cell”, as used herein, refers to a cell that is recognized as a function of the targeting ligand portion of the hybrid envelope protein, but is not recognized as a function of the envelope portion of the hybrid envelope protein.
- targeting ligand is meant a molecule that has binding affinity for a molecule on the surface of a desired targeted cell.
- a “hybrid envelope protein”, as used herein, is a protein that includes a portion of a viral envelope protein (or a biologically active analog thereof) covalently linked to a targeting ligand.
- hybrid immunoglobulin-env protein a portion of an immunoglobulin covalently linked to a portion of an envelope protein.
- a “hybrid envelope gene” is a nucleic acid that provides genetic instructions for a hybrid envelope protein.
- hybrid anti-careinoe bryonic antigen-specific immunoglobulin is meant a hybrid immunoglobulin-env protein that specifically binds to a carcinoembryonic antigen.
- fragment includes some but not all of the envelope protein.
- a fragment will ordinarily be at least about about 20 amino acids, typically at least about 30 amino acids, usually at least about 40 contiguous amino acids, preferably at least about 50 amino acids, and most preferably at least about 60 to 80 or more contiguous amino acids in length. Fragments of an envelope protein can be generated by methods known to those skilled in the art (e.g., those described herein).
- a biologically active fragment of a viral envelope protein is one that possesses at least one of the following activities: a) it can bind to a cell membrane if given the appropriate targeting ligand; b) it can enable fusion with a cell membrane; or c) it can enable incorporation of proteins into a mature viral particle. These three biological activities can be performed by the same envelope protein fragment, or by two separate envelope protein fragments.
- the envelope fragments of this invention do not facilitate recognition or binding of the virus' normal host cell. This is accomplished by either destroying the activity of the normal receptor binding region by mutation, or by physically deleting it. A new recombinant receptor- binding region is added in its place.
- the ability of a candidate fragment to exhibit a biological activity of a viral envelope protein can be assessed by methods known to those skilled in the art.
- the envelope fragment may include the amino acid sequence of a naturally-ocurring viral envelope or may be a biologically-active analog thereof.
- the biological activity of an envelope analog is assessed using the methods described herein for testing envelope fragments for activity.
- Applicants have provided an efficient and reliable means for specifically delivering therapeutic genes or antisense nucleic acids to particular animal, plant or human cell types, or to cells of infectious agents. Their method facilitates treatments for mutagenically acquired, infectious, or inherited diseases, e.g. , by either 1) antagonizing the effect of an existing cellular gene; 2) complementing the defect of an existing cellular gene; 3) destroying the target cells through the introduction of new genetic material; or 4) changing the phenotype of the target cells through the introduction of new genetic material.
- a hybrid envelope protein e.g., an envelope- antibody or envelope-ligand hybrid
- the viruses itself, through its efficient internalization mechanisms, facilitates efficient uptake of the therapeutic gene.
- viral vectors are uniquely adapted to deliver genes, RNA, or drugs to cell surface proteins that do not normally internalize.
- Another advantage of this invention is that it overcomes the problem of gene regulation encountered with other methods of gene therapy. Genetically-altered cells must not only synthesize the gene products at the right location, at the right time, and in the right amounts, but must also be regulated in the same manner as the indigenous tissue. That is, the transduced cells must also have all the proper signal transduction mechanisms to respond to extracellular signals.
- fibroblasts do not contain the same receptors and signal transduction machinery as pancreatic beta cells, the insulin genes may be expressed differently. Targeting genes to the right cells insures that the genes will be properly regulated.
- a selection scheme is devised for creation of hybrid envelope protein-containing, viruses. This strategy will be feasible for env proteins fused with immunoglobulins or with any ligand that recognizes specific receptors on cells.
- FIG. 1 is a representation of a scheme for constructing retroviral vector pLNCX*.
- FIG. 2 is a representation of a scheme for constructing plasmid LNCenvpA.
- FIG. 3 is a representation of a scheme for constructing plasmid LNCenv.
- FIG. 4 is a representation of a scheme for constructing plasmid pUC Star-Sig.
- FIG. 5 is a representation of a scheme for constructing plasmid LNC-Sig.
- FIG. 6 is a representation of a scheme for constructing plasmid LNC-antiCEA.
- FIG. 7 is a representation of plasmids used in the construction of targeted viruses.
- FIG. 8 is a representation of a strategy for generating targeted retroviruses involving construction of hybrid immunoglobulin-env genes in vitro.
- FIG. 9 is a representation of a strategy for generating targeted retroviruses involving generation of pooled virus constructions.
- FIG. 10 is a representation of a strategy for generating targeted retroviruses involving selection and characterization of targeted virus.
- FIG. 11 is a representation of a plasmid containing a targeted retroviral vector.
- FIG. 12 is a representation of a scheme for constructing plasmid pUC Star-antiCEA.
- FIG. 13 is a representation of an alternative scheme for constructing plasmid LNC-antiCEA.
- the receptor recognition domain of the viral envelope protein is replaced with a ligand directed against a specific cell surface receptor.
- the hybrid envelope protein is incorporated into the viral envelope during the budding process, producing a hybrid virus in vivo, upon infection of a host, the hybrid virus specifically recognizes its target cell and resultant fusion with that cell facilitates internalization (into the target cell) of viral genes, including the therapeutic gene(s) which are engineered into the viral genome.
- Such internalization can be extremely important; for example, immunotoxins, although efficient at delivering toxin molecules to target cells, are often clinically ineffective since the cell surface molecules to which they are targeted do not internalize, and internalization is required for entry of the toxin molecules into the cells (Waldmann, T.A. , 1991, Science 252: 1657-1662) .
- Targeted viruses circumvent this requirement for receptor internalization since the virus itself contains the necessary cell fusion machinery (Gilbert, J.M. , et al., 1990, J Virol 64: 5106-5113; Roizman, B. et al., 1990, in BN Fields, et al., eds. Virology. Raven Press, Ltd. New York) .
- targeted viruses are constructed by replacing the receptor recognition domain of the viral envelope protein with a ligand directed against a specific cell surface receptor.
- the ligand can be, without limitation, an immunoglobulin (e.g., FAb, dAb, Fd, or Fc) , a hormone, or any other synthetic or natural protein that can direct the binding of the targeted viruses to a cell surface molecule.
- the ligand is biologically incorporated into the viral envelope by genetic fusion with that portion of the normal viral envelope protein involved in viral assembly and budding.
- the envelope portion of the hybrid protein consists of an envelope fragment (or analog thereof) that is sufficient to direct efficient incorporation of the envelope hybrid protein into the viral envelope.
- the envelope hybrid protein no longer directs an interaction between the virus and its normal host cell.
- VSV vesicular stomatitis virus
- virus envelopes can tolerate changes in length or conformation introduced into the envelope protein, e.g., by a conjugated ligand.
- Gitman et al have shown that Sendai virus envelopes reconstituted with viral envelope glycoproteins, chemically cross-linked to anti-erythrocyte antibodies acquire the ability to bind to erythrocytes that had been stripped of the normal virus receptor.
- Sendai virus envelopes reconstituted with envelope proteins, chemically cross-linked to insulin molecules were able to bind to receptor-stripped erythrocytes expressing the insulin receptor. In both cases, envelope binding but not fusion occurred with the receptor-stripped erythrocytes.
- the targeted virus contains 1) a viral envelope derived from a host cellular membrane; 2) a transmembrane hybrid envelope protein that directs the binding and penetration of the virus to specific target cells; 3) a transmembrane envelope protein that directs the fusion of the targeted virus with the cellular membrane of the targeted cell for viral penetration (e.g., the targeting protein itself or another envelope protein) ; 4) viral core proteins; 5) a foreign gene(s) of interest; and 6) all necessary viral and genetic components for penetration and expression of genes contained in the viral genome.
- the transmembrane hybrid' envelope protein consists of 1) determinants that enable the hybrid protein to become processed and incorporated into viral envelopes; 2) determinants that enable fusion of the viral envelope with the targeted cellular membrane; these are essential for penetration of the targeted virus; 3) a ligand determinant that enables the targeted virus to recognize and bind to specific receptors on target cells.
- the viral genome may also include bacterial selectable markers (e.g., ampicillin resistance) and/or a mammalian cell selectable marker (e.g., neomycin resistance).
- the transmembrane hybrid protein is constructed genetically by splicing the cell surface receptor binding domain of a ligand gene to a portion of the viral envelope protein gene.
- the transmembrane hybrid protein must retain those portions of the envelope protein that direct the efficient post-translational processing, sorting and incorporation of the protein into the viral envelope.
- the receptor binding domain is that portion of the envelope protein that recognizes and binds to cell surface receptors. In hybrid envelope proteins, this portion of the envelope protein is replaced with ligand sequences.
- the receptor binding domain of retrovirus envelope proteins has been localized to the SU subunit (Coffin, J.M. , 1990, in BN Fields, et al., eds. Virology r Raven Press, Ltd., New York). Since the SU protein of retroviruses is coded for 5' to the transmembrane protein, replacement of the amino-terminal sequences of the envelope protein with ligand sequences poses no problem for the creation of a functional hybrid ligand- envelope protein.
- the envelope protein of retroviruses is synthesized as a polyprotein which is later proteolytically cleaved to form SU and TM heterodimers.
- the proteolytic cleavage site should be eliminated.
- the proteolytic cleavage site should be eliminated either by deletion or by site directed mutagenesis. Perez and Hunter have demonstrated that elimination of the . proteolytic cleavage site does not block transport or surface expression of Rous sarcoma virus envelope proteins (Perez, L.G., et al. , 1987, J Virol 61:1609- 1614) .
- trimerization of the envelope protein is thought to be essential for the proper transport and insertion of envelope proteins into the viral envelope (Singh, J. et al., 1990, Embo J 9.:631-639; Kreis, T.E., et al., 1986, Cell 46.:929-937) . Therefore it is important that this domain be retained in the hybrid ligand-envelope protein.
- the trimerization domain likely resides in the transmembrane TM protein of retroviruses (Einfeld, D.
- the fusion domain is a hydrophobic stretch of amino acids that is involved in fusion of the virus envelope with the cell membrane (Wiley, D.C., et al., 1990, in Fields, B.N. et al., eds. Virology r 2nd ed. , Raven Press, Ltd., New York). Viral fusion allows entry of the viral core proteins and genome into the cell.
- influenza virus the fusion domain, located in the amino terminus of the envelope HA2 protein, is sequestered in the hemagglutinin trimer until a low pH-induced conformational change allows presentation of the fusion domain to the cell membrane.
- Trimerization of the envelope proteins can prevent constitutive expression of fusion activity by sequestering it within an internal hydrophobic pocket.
- a potential fusion domain has been located within the extracellular portion of the gp37 TM protein of Rous sarcoma virus (Hunter E. et al., 1983, J Virol __ y.920-936) .
- Similar hydrophobic fusion sequences have been noted in the pl5E protein of Moloney murine leukemia virus (Mo-MuLV) (Chambers, P., et al.,1990, J Gen Virol 71:3075-3080).
- the first protein is the hybrid ligand-envelope protein which directs targeting of the virus but lacks fusion activity.
- the second protein is an envelope protein possessing fusion activity but lacking a receptor binding domain. This type of situation is observed for paramyxoviruses where one envelope protein is dedicated to targeting while another carries out fusion (Kingsbury, D.W. , 1990, B.N. Fields, et al., eds. Virology, 2nd ed. , Raven Press, Ltd., New York.). Where it is not necessary to prevent constitutive fusion activity, both activities may be included in one protein. 5. Transmembrane domain
- the transmembrane domain is a stretch of approximately twenty or more amino acids that anchor the envelope protein to the viral envelope. It is located within the pl5E protein of Moloney murine leukemia virus (Chambers, et al., supra) . Retention of the transmembrane domain is thought to be essential since deletion of the transmembrane domain results in secretion of the synthesized envelope protein (Perez, L.G., et al., 1987, J Virol 11:2981-2988). 6. Virus budding domain
- Amino acid sequences within the envelope protein may be involved with the exclusive incorporation of viral envelope proteins into viral envelopes and with virus budding.
- the virus budding domain directs the hybrid ligand-envelope protein into the viral envelope. These sequences are thought to reside within the portion of the envelope protein facing the inside of the virus and may involve specific protein-protein interactions between envelope proteins and viral core or matrix proteins.
- Sorting signals are determinants that direct the envelope protein to the correct intracellular location during post-translational processing. These sequences insure that the envelope protein passes through the endoplasmic reticulum, Golgi apparatus, and other ⁇ rganelles until it eventually reaches the viral envelope. Other signals that may have to be retained in the hybrid ligand-envelope protein are glycosylation sequences and sequences involved in effective conformation of the envelope protein (e.g., disulfide bonds) .
- the signal sequence is an amino-terminal hydrophobic stretch of amino acids that directs the envelope protein into the endoplasmic reticulum.
- the signal sequence which is later proteolytically cleaved. is essential for the hybrid ligand-envelope protein to become located in a membrane.
- the diversity of signals and domains that must be considered in constructing targeted viruses requires that precise and correct splicing of ligand and envelope genes occur.
- the present invention describes a selection scheme for constructing targeted viruses whereby the ligand gene is spliced to an envelope gene fragment; this hybrid gene codes for those portions of the envelope protein which are required to direct efficient incorporation of the resultant hybrid envelope-ligand protein into the mature viral particle.
- cell surface receptor binding domains of ligand genes are randomly ligated to progressive deletions of viral envelope genes.
- the correct combination of ligand and envelope sequences is determined by a selection scheme for the production of biologically active targeted virus. The selection scheme not only produces targeted virus but simplifies the construction of future targeted viruses.
- a Specific Example of a Targeted Retrovirus There now follows an example of a recombinant retrovirus which targets and infects particular host cells for the purpose of delivering to those cells a desired therapeutic gene.
- This example is provided for the purpose of illustrating, not limiting, the invention.
- Moloney murine leukemia virus (Mo-MuLV) is a mouse ecotropic retrovirus.
- a recombinant Mo-MuLV based retroviral vector that is targeted to colon cancer cells is constructed.
- the targeted retroviral vector delivers the neomycin resistance gene to colon cancer cells.
- Targeting to human colon cancer cells is accomplished by incorporating into the viral envelope hybrid immunoglobulin-env proteins directed against carcinoembryonic antigen.
- Carcinoembryonic antigen is a tumor associated antigen expressed on the surface of human colon cancer cells but not on the surface of normal adult cells.
- the CEA glycoprotein possessing multiple membrane spanning alpha helices, does not internalize in response to ligand (Benchimol, S. et al., 1989, Cell 57:327-334).
- a protein that is homologous to carcinoembryonic antigen has recently been shown to be the receptor for mouse hepatitis virus (Dveksler, G.S., et al, 1991, J Virol 65.:6881-6891) .
- a single variable region of the heavy chain of anti-CEA is fused to a portion of the env gene.
- dAb Single variable heavy chain fragments
- Fb fragmented antibodies
- dAb's Single variable heavy chain fragments
- monoclonal antibodies Ward, E.S., et al.. Nature 341:544-546.
- the function of immunoglobulin-env proteins is not limited, however, to the use of dAb's and can be applied with FAb's, Fv's and mAb's. Modification of the retroviral vector LNCX
- LNCX is a Moloney murine leukemia virus based retroviral vector contained in the plasmid pLNCX (Miller, A.D., et al., 1989, Biotechniques 2:980-990).
- pLNCX contains a unique Hindlll and Clal cloning site for expression of inserted genes, a cytomegalovirus (CMV) promoter, a polyadenylation site (pA) , retroviral long terminal repeats (LTR) for retroviral RNA transcription and reverse transcription, a bacterial neomycin resistance gene (Neo) which conveys resistance to both neomycin and G418, a bacterial origin of replication
- CMV cytomegalovirus
- pA polyadenylation site
- LTR retroviral long terminal repeats
- Neo bacterial neomycin resistance gene
- LNCX is modified to contain a unique Sail site as shown in Figure 1.
- pLNCX is linearized with Xbal and subcloned into the Xbal site of the phagemid Bluescriptll SK+ (Stratagene, La Jolla, CA) .
- Single stranded DNA is purified and the unique BstEII site of LNCX is converted into a Sail site by site directed mutagenesis with the oligonucleotide 5'-GCAGAAGGTCGACCCAACG-3' (SEQ ID NO: 1).
- the BstEII site is located within the extended packaging signal ( ⁇ +) of Mo-MuLV RNA (Bender, M.A. , et al., 1987, J Virol 61:1639-1646; Adam, M.A., et al., 1988, J Virol 62:3802- 3806; Armentano, D. et al., 1987, J Virol 61:1647-1650) .
- Conversion of the BstEII site to Sail does not affect packaging since this region has been determined to be dispensable for efficient packaging (Schwartzberg. P., et al., 1983, J Virol 46:538-546; Mann R.
- the BstEII site is converted into a Sail site because BstEII sites, but not Sail sites, frequently occur in heavy chain genes (Chaudhary, V.K. , et al, 1990, Proc Natl Acad Sci USA 82:1066-1070).
- the Sail containing plasmid is recircularized with Xbal and DNA ligase to form the plasmid pLNCX*.
- the Mo-MuLV env gene is cloned into pLNCX*. as shown in Figure 2.
- the Mo-MuLV env gene is excised from plasmid p8.2 (Shoemaker, C. , et al., 1980, Proc Natl Acad Sci USA 22:3932-3936) as a 1.9kb Scal-Nhel fragment.
- the 1.9kb Scal-Nhel fragment contains the entire coding region for the pl5E transmembrane protein and the majority of the coding region for the gp70 SU protein.
- the 5'-protruding ends are digested with Sl-nuclease, and Hindlll linkers (5-CCAAGCTTGG-3'; SEQ ID NO: 2) are added.
- the env gene is cloned as a Hindlll fragment in the Hindlll site of pLNCX* to form plasmid LNCenvpA.
- the orientation of the Hindlll env fragment is such that it can be transcribed and expressed from the cytomegalovirus (CMV) promoter. Modification of LNCenvpA to LNCenv
- LNCenvpA is cloned as an Xbal fragment in phagemid pBluescript II SK+ for additional site directed mutagenesis ( Figure 3) .
- the env encoding Hindlll fragment contains a polyadenylation signal that may interfere with the polyadenylation signal provided by the viral vector.
- the AAUAAA polyadenylation signal is therefore changed to AAGAAA by site directed mutagenesis with the oligonucleotide 5'-GTTTTCTTTTATC-3' (SEQ ID NO: 3) .
- the Hindlll site located at the 3' end of the env gene is eliminated by site directed mutagenesis with the oligonucleotide 5-CAAGCATGGCTTGCC-3' (SEQ ID NO: 4).
- the env containing retroviral vector is re ⁇ ircularized by Xbal restriction and ligation to form plasmid LNCenv.
- Molecular cloning of anti-CEA immunoglobulin genes cDNA encoding the mature variable region domain of anti-CEA heavy chain genes is cloned as an Xhol-Spel fragment using the polymerase chain reaction (PCR) and RNA template.
- RNA is derived from the spleen of mice immunized against purified carcinoembryonic antigen.
- RNA can be derived from hybridoma cell lines that secrete monoclonal antibodies against CEA, e.g., 1116NS-3d (American Type Culture Collection CRL8019) or CEA 66-E3 (Wagener, C, et al., 1983, J Immunol 130:2308-2315) .
- the following PCR primers hybridize to cDNA encoding the aminoterminal end of mature heavy chain genes (Stratacyte, Inc.).
- the degenerate primers introduce an Xhol site which is underlined. 5' AGGTGCAGCTGCTCGAGTCGGG 3' (SEQ ID NO: 5)
- ImmunoZAP H is a modified lambdaZAP vector that has been modified to express in E.coli immunoglobulin variable heavy chain fragments behind a pelB signal sequence. The procedure could similarly be performed by expressing immunoglobulin variable light chain fragments in a packaging cell line. Identification of high affinity anti-CEA clones Clones expressing high affinity anti-CEA antibodies are identified by a filter binding assay.
- the anti-CEA phage library is screened by nitrocellulose plaque lifts with [ 125 I]bovine serum albumin conjugated to CEA, as previously described (Huse, W.D., et al., 1989, Science 146:1275-1281). High and intermediate affinity anti-CEA clones are chosen for further manipulation. Construction of plasmid LNC-itnmuno ⁇ loj ulin
- LNC-antiCEA which codes for an anti-CEA immunoglobulin gene
- LNC- immunoglobulin vectors encode an immunoglobulin peptide fused to an amino-terminal signal sequence. Some-amino acids at the amino-terminal end of the mature immunoglobulin peptide have been modified by the PCR primers used to generate the immunoZAP library.
- the design of the LNC-antiCEA plasmid results in the insertion of an extra amino acid at the amino terminal end.
- amino acid changes do not affect antigen binding because 1) the amino acid changes are conservative; 2) the affected amino acids are normally variable at those sites; and 3) the affected amino acids occur within the framework region of immunoglobulins which has been shown not to participate in antigen binding or conformation of the antibody (Relchman et al. 1988 Nature 332:323-327) . It is for these same reasons that cleavage of the signal sequence from mature peptide will not be affected.
- pUC119 is a phagemid containing a polylinker cloning site.
- the multiple cloning sites of pUC119 are replaced with new restriction sites by insertion of the following polylinker into the Hindlll and Xbal sites of pUC119.
- the modified pUC119 is called pUC Star-1 ( Figure 4) .
- the restriction sites may be further separated by small linkers, if adjacent restriction sites interfere with one another during digestion.
- the signal sequence from an anti-NP immunoglobulin heavy chain gene is isolated from plasmid pcDFL.l (Ucker, D.S., et al., 1985, J Immnol JL35:4204-4214) as a ⁇ 330bp PstI fragment.
- the 330bp PstI fragment is subcloned into pUC Star-1 to yield plasmid pUC Star-Sig ( Figure 4).
- the PstI fragment is oriented so that the signal sequence can be expressed.
- LNCX* is converted into a eukaryotic immunoglobulin expression vector ( Figures 4 and 5) .
- An immunoglobulin heavy chain signal sequence and Xhol-Spel cloning sites are inserted behind the CMV promoter of plasmid LNCX* to allow expression of the PCR amplified immunoglobulin genes.
- Conversion of LNCX* is as follows. The immunoglobulin heavy chain signal sequence is recovered from pUC Star-Sig as a Hindlll-Clal restriction fragment and cloned into the Hindlll-Clal sites of LNCX*.
- the resulting plasmid, LNC-Sigr contains a retroviral vector with the immunoglobulin heavy chain signal sequence under control of the CMV promoter ( Figure 5) .
- An anti-CEA gene from the immunoZAP library is then subcloned into LNC-Sig to form plasmid LNCanti-CEA.
- This generates an anti-CEA variable heavy chain gene containing a signal sequence ( Figure 6).
- the anti-CEA gene is first excised from immunoZAP phage DNA as a Bluescript SK- phagemid (see lambdaZAP protocols, Stratagene, Inc. La Jolla, CA) .
- the anti-CEA gene is purified as an Xhol-Spel fragment and ligated to Xhol- Spel restricted LNC-Sig.
- LNC-Sig contains three Spel sites. Therefore, to generate plasmid LNCanti-CEA, the ligation mix is transformed into neomycin-sensitive, ampicillin-sensitive E__ coli and neomycin-resistant, ampicillin-resistant transformants are selected for. Plasmid LNCanti-CEA is screened from neomycin-resistant, ampicillin-resistant transformants by using the Spel-Xhol anti-CEA restriction fragment from Bluescript SK-anti-CEA as a probe. The Spel site is used because of dependence upon the available sites in the ImmunoZap expression vector. To simplify construction of LNCanti-CEA, a unique NotI site can be introduced into the ImmunoZap H expression vector so that NotI sites can be used instead of Spel sites.
- An anti-CEA gene from the immunoZAP library is subcloned into plasmid pUC Star-Sig to form plasmid pUC Star-anti-CEA. This generates an anti-CEA variable heavy chain gene containing a signal sequence ( Figure 12) .
- the anti-CEA gene is excised from immunoZAP phage DNA as a Bluescript SK-phagemid (see lambdaZAP protocols, Stratagene, Inc., La Jolla, CA) . Bluescript SK-anti-CEA double stranded DNA is prepared and restricted with Xhol and Spel.
- the anti-CEA containing Xhol-Spel fragment is purified by electroelution and ligated to Xho-Spel restricted pUC Star-Sig to create plasmid pUC Star- antiCEA ( Figure 12) .
- the antiCEA gene is transferred from pUC Star-anti CEA to LNCX* as a Hindlll-Clal fragment to create plasmid LNC-antiCEA (figure 13) .
- the antiCEA-containing Hindlll- Clal fragment is purified from pUC Star-antiCEA by electroelution. Phosphatase treated, Hindlll-Clal restricted LNCX* is ligated with the purified Hindlll- Clal antiCEA fragment to generate LNC-antiCEA (figure 13) .
- LNCenv and LNC-immunoglobulin in this example, LNC-antiCEA
- Figures 8-11 diagram the general principle for the primary generation of targeted viruses.
- Hybrid immunoglobulin-env proteins are generated that target viruses to cells expressing carcinoembryonic antigen. Since the location of important determinants for envelope protein sorting (S) , trimerization (T) , and fusion (F) is not known with certainty, the immunoglobulin gene is ligated to progressive deletions of the env gene and functional immunoglobulin-env hybrids are selected for.
- the envelope portion of the fusion protein may consist of any portion of the envelope protein (or any analog thereof) which is sufficient to direct efficient incorporation of the envelope fusion protein into the viral coat (upon budding of the recombinant virus from a producer cell line) .
- Such fragments or analogs may be determined using the following general selection scheme which generally involves ligation of cell surface receptor binding domains of ligand genes to progessive deletions of viral envelope genes.
- the correct combination of ligand and envelope sequences is determined by a selection scheme for the production of biologically active targeted virus. The selection scheme not only produces targeted virus but simplifies the construction of future targeted viruses.
- LNCenv contains the coding region for the Mo-MuLV env polyprotein ( Figure 8) .
- LNCenv is first linearized by Hindlll restriction. A range of deletions extending into the env gene is created by collecting aliquots of Exonuclease III treated DNA over time and removing 5'-processive ends with Sl-nuclease (Guo, I.H., et al., 1983, Methods Enzymol 100:60; and Sambrook, J. , et al., 1989, Molecular Cloning. Cold Spring Harbor Laboratory Press, Cold Spring Harbor) .
- NotI linkers (5' AGCGGCCGCT 3' SEQ ID NO: 13) are ligated onto the blunt end termini and restricted with NotI. This results in a NotI restriction overhang at the 5'-border of every deletion within the env gene. The NotI overhangs at the other end of the molecules are removed by Sail restriction of the reaction mixture. The reaction mixture is then treated with phosphatase to prevent circularization of the reaction products. The reaction mixture is ligated to a Sall-NotI restriction fragment from LNC-antiCEA that contains the anti-CEA variable heavy chain gene. This creates a pool of functional retroviral vectors encoding an anti-CEA peptide fused to a series of env deletions. Generation of pooled virus constructions
- the total reaction mixture from above is transformed into ampicillin-sensitive E. coli and ampicillin resistance is selected for ( Figure 9) .
- Re ⁇ ombinants containing functional retroviral vectors are selected for since only they contain the ampicillin resistance gene.
- Plasmid DNA is prepared from transformants grown in liquid culture to create a pool of retroviral vectors containing different immunoglobulin- env fusion genes.
- the DNA is transfected into the crip2 retroviral packaging cell line (Danos, 0., et al., 1988, Proc Natl Acad Sci USA 85: 6460-6464) .
- DNA is transfected into a packaging cell line that does not encode wild-type env protein.
- the transfected packaging cell line synthesizes each of the different hybrid immunoglobulin-env proteins as well as the wild type env protein (encoded by an env gene contained in the cell line) .
- the transfected packaging cell line secretes a pool of enveloped retroviruses containing the different retroviral genomes encoding hybrid immunoglobulin-env genes. If the hybrid immunoglobulin-env protein retained all of the necessary determinants for efficient incorporation into viral envelopes then the hybrid-env protein can be incorporated into viral envelopes. Wild type env proteins encoded for by the packaging cell line are also incorporated into the viral envelopes. This creates a virus containing both wild type and hybrid env proteins in the viral envelope.
- This system therefore selects for immunoglobulin-env hybrids that can incorporate their gene products into the viral envelope.
- Virus pools are harvested from media filtered at 0.45 ⁇ to remove contaminating G418-resistant packaging cells. Selection and characterization of targeted virus G418-sensitive target cells are exposed to virus pools by standard procedures, and G418-resistant cells are selected for.
- the target cells can be any non-mouse cell line (uninfe ⁇ table by wild type Mo-MuLV) that expresses carcinoembryonic antigen.
- ATCC COLO 205 a human cell line isolated from the ascites of a patient with carcinoma of the colon (A.T.C.C.#CCL 222); LR-73 CEA, a Chinese hamster ovary cell line transfected with a mouse carcinoembryonic antigen gene (Benchimol, S. et al., supra) ; and HCT48, a human colon adenocarcinoma cell line (Shi, Z.R., et al., 1883, Cancer Res 11:4045-4049).
- G418-resistant cells can only have arisen from transduction of the neomycin resistance gene by targeted virus. This system therefore selects for recombinant viruses that have hybrid immunoglobulin-env proteins that have retained all the necessary determinants for viral targeting and fusion. Rescue of integrated immunoglobulin-env gene
- PCR polymerase chain reaction
- PCR 5' Rescue primer 5 '-CCAGCCTCCGCGGCCCCAAGCTTCTGCA-3' (SEQ ID NO: 14)
- the retroviral vector produced in the above selection scheme is targeted to both CEA-expressing human cells (directed by the hybrid envelope protein) and normal mouse cells (directed by the wild type envelope protein) when produced in crip2 packaging cells.
- the retroviral vector will irst be tested to determine if incorporation of the hybrid envelope protein alone is sufficient to direct virus fusion. This is accomplished by transfecting DNA into a modified packaging cell line that does not encode wild type env.
- targeted viruses will be created as follows.
- a packaging cell line will be created that encodes an env gene containing mutations in the receptor binding domain.
- targeted viruses expressing both hybrid ligand-env proteins and env proteins with mutated binding sites will be produced.
- the viruses will exclusively infect target cells.
- the targeted viral vector is a universal vector
- the viral vector that is constructed by the above procedure is a universal targeted vector ( Figure 11) .
- Targeting to other cells is accomplished by replacing the Xhol-Spel anti-CEA fragment with any Xhol-Spel fragment encoding an in-frame immunoglobulin or ligand directed against specific cell surface proteins.
- an Xhol-Spel immunoglobulin-containing fragment from an immunoZAP library can be fused in frame behind a signal sequence and subcloned into LNCX* through the pUC Star- Sig plasmid, as outlined above. Substituting a Sall-NotI fragment from another LNC-immunoglobulin plasmid into the universal vector would create another targeted virus vector.
- Any enveloped virus may be used as a vector for the targeted delivery of a therapeutic gene.
- Particular examples include both DNA and RNA viruses, such as Herpesviridae, e.g., herpes simplex type 1 or 2, Paramyxoviridae, Retroviridae, Hepadnaviridae, Poxviridae, Iridoviridae, Togaviridae, Flaviviridae, Coronaviridae, Rhabodoviridae, Filoviridae, Orthomyxoviridae, Bunyaviridae, or Arenaviridae, or any other, yet unclassified, enveloped virus.
- Herpesviridae e.g., herpes simplex type 1 or 2, Paramyxoviridae, Retroviridae, Hepadnaviridae, Poxviridae, Iridoviridae, Togaviridae, Flaviviridae, Coronaviridae, Rhabodoviridae, Filovirid
- any molecule that is capable of directing specific interaction with a target host cell may be used as the targeting ligand portion of the envelope fusion protein.
- a target host cell e.g., by specific recognition of and binding to a host cell surface protein
- a protein is derived from one member of a ligand:receptor pair.
- the targeting ligands are not limited to proteins. Carbohydrate and lipid moieties can be attached to the envelope protein via protein fragments containing consensus sequences for glycosylation and lipidation.
- Immunoglobulin genes can be used as ligands, as shown in the example above. Genes for high affinity immunoglobulins are screened from a lambda or bacterial expression library by a filter binding assay with [ 125 I] bovive serum albumin conjugated to antigen, as previously described (Huse, et al. Supra) .
- Cell surface molecules such as integrins, adhesion molecules or homing receptors can be used as cell- specific ligands since they are involved in cell-cell interactions via receptors on other cells. Genes encoding these molecules can be identified by the panning method of Seed and Aruffo (Seed. B., et al., 1987, Proc Natl Acad Sci USA 84:3365-3369) .
- Hormones that bind to specific receptors can be used as targeting ligands as well as viral proteins, such as HIV envelope protein gpl20, and modifications of naturally occuring ligands.
- Therapeutic Genes can be used as targeting ligands as well as viral proteins, such as HIV envelope protein gpl20, and modifications of naturally occuring ligands.
- Therapeutic genes useful in the invention include the following. 1) Genes that are therapeutic to cancer cells may include a) antisense oncogenes; b) tumor suppressor genes, such as p53 or the retinoblastoma gene product Rb, c) destructive toxin genes such as a diphtheria toxin gene; d) cytokines such as tumor necrosis factor or interferons; or e) any other therapeutic gene. 2) Therapeutic genes targeted to cells that are infected with HIV.
- antisense DNA complementary to essential genes for HIV e.g., polymerase
- destructive toxin genes- e.g., diphtheria toxin
- genes that will invoke intracellular immunity e.g., HIV enhancer sequences that titrate and remove HIV regulatory proteins (Baltimore, D., 1988, Nature 335:395-396) .
- HIV enhancer sequences that titrate and remove HIV regulatory proteins (Baltimore, D., 1988, Nature 335:395-396) . 3) Genes to correct inherited deficiencies. Examples include, but are not limited to, insulin genes delivered specifically to pancreatic beta cells, or the cystic fibrosis transmembrane regulator (CFTR) gene delivered to the appropriate lung cells of cystic fibrosis patients.
- the expression of targeted genes can be further accomplished through the use of tissue specific enhancers that regulate the transgene.
- the appropriate recombinant virus is administered to a patient in a pharmaceutically- acceptable buffer (e.g., physiological saline).
- a pharmaceutically- acceptable buffer e.g., physiological saline.
- the therapeutic preparation is administered in accordance with the condition to be treated.
- the virus is administered by direct injection, e.g., by intravenous, intramuscular, or intraperitoneal injection, at a dosage that provides suitable targeting and lysis of HIV-infected host cells.
- an appropriate dosage is an amount of therapeutic virus which effects a reduction in the disease.
- Targeted virus can also be administered by implanting viral packaging cells into a patient.
- the cells can be enclosed in a semi-permeable container, e.g., permeable to a virus but not permeable to a packaging cell.
- the implanted container may be removable.
- the container may be hooked up to a patient intravenously, so that virus enters the patient through a needle or through a catheter. In this way the patient receives a continuous dose of viral gene therapy.
- replication competent viruses may be used in certain cases.
- modified packaging cells rather than the targeted virus
- a non-proliferating dose of recombinant virus is delivered to a local area, and then the virus locates the specific target cell.
- TIL tumor infiltrating lymphocytes
- Treatment may be repeated as necessary. Immune response against targeted viruses can be overcome with immunosuppressive drugs.
- the virus of the invention may be used to target other cancer cells, e.g., ovarian, breast, or lung cancer cells, or cells affected with hereditary diseases such as muscular dystrophy, Huntington's disease, or cells with a defect in adenosine deaminase.
- Herpesviridae viruses may include Herpes simplex type 1 or type 2, Epstein-Barr virus, or Cytomegalovirus. Sendai virus and Vaccinia virus may also be adapted to this method.
Abstract
Description
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Also Published As
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JPH07505773A (en) | 1995-06-29 |
AU3940293A (en) | 1993-11-08 |
EP0633943A1 (en) | 1995-01-18 |
EP0633943A4 (en) | 1997-05-02 |
CA2133411A1 (en) | 1993-10-14 |
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