WO1994010198A1 - Method of reducing multidrug resistance in cells and tissues - Google Patents
Method of reducing multidrug resistance in cells and tissues Download PDFInfo
- Publication number
- WO1994010198A1 WO1994010198A1 PCT/EP1993/003073 EP9303073W WO9410198A1 WO 1994010198 A1 WO1994010198 A1 WO 1994010198A1 EP 9303073 W EP9303073 W EP 9303073W WO 9410198 A1 WO9410198 A1 WO 9410198A1
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- WIPO (PCT)
- Prior art keywords
- ser
- glu
- asn
- thr
- leu
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- A61K47/62—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being a protein, peptide or polyamino acid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/69—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit
- A61K47/6905—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a colloid or an emulsion
- A61K47/6911—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a colloid or an emulsion the form being a liposome
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
- C07K2317/34—Identification of a linear epitope shorter than 20 amino acid residues or of a conformational epitope defined by amino acid residues
Definitions
- the present invention relates to vaccines for reducing multidrug resistance in cells and tissues, especially cancer cells. More particularly, the present invention relates to a method of vaccinating against certain portions of P-protein and using the vaccines to to reduce multidrug resistance in cancer cells in vivo.
- MDR multidrug resistance
- MDR MDR resistance to many natural products drugs with widely different structures and different mechanisms of action.
- Table. 1 Pastan et al show a few drusis used in the treatment of cancer in relation with the multidrug resistance to them. (See Pastan, I., Willingham. M.C., & Gottesman, M. (1991) FASEB J. 5, 2523-2528.)
- the most common biochemical characteristic of multidrug- resistant cells is the increased expression of a membrane glycoprotein with a molecular weight of approximately 170,000 Daltons.
- the size of P-protein, sometimes referred to as P-glycoprotein, in the absence of N-glycosylation has been estimated as approximately 140,000 Daltons.
- cDNA clones for the hamster P-protein several investigators have shown that the P-protein gene is amplified in multidrug-resistant cell lines, and that gene amplification is accompanied by increased expression of 4.5 to 5.0 kb P-protein mRNA. Differential amplification of DNA sequences hybridizing to P-protein clones has suggested that P-proteins may be encoded by a multigene family.
- MDR1 mRNA is located on the biliary surface of hepatocytes and small biliary ductules, on the brush border of renal proximal tubule cells, on the lumenal surface of pancreatic ductules, on the lumenal surface of the mucosa of the small and large intestine, and diffusely in both medulla and cortex of the adrenal.
- MDR RNA is found in a similar location in the gastrointestinal tract in the hamster by in situ hybridization.
- an MDRl-related gene is also expressed at high levels in secretory epithelial cells in the gravid uterus. This localization is consistent with a role for P-protein as a transporter in most of these organs. Liver, kidney, and bowel are the sites from which cytotoxic natural products present in the diet, or introduced by the chemotherapist, are removed from the body. Hence, the MDR1 gene product could be functioning as a multidrug transporter in these locations to protect animals from a variety of cytotoxic compounds present in their diets. In rat Uver, levels of MDR1 RNA increase after hepatectomy or after treatment with chemical carcinogens, supporting the idea that expression of the MDR1 gene is a response to toxic insult. In the adrenal gland or the pregnant uterus, the MDR1 gene product may also be involved in transport of endogenous metabolites.
- Adenocarcinomas derived from adrenal, kidney, liver, and bowel are known to be intrinsically resistant to a broad range of chemotherapeutic agents, including the drugs to which multidrug-resistant cells are resistant. These tumors express easily detectable levels of MDR1 mRNA, suggesting that their multidrug-resistant phenotype is related to the presence of the multidrug transporter. For kidney tumors, this concept is supported by evidence that unselected cell lines derived from kidney cancers express MDR1 RNA and are multidrug-resistant, and mis resistance can be reversed by verapamil and quinidine.
- compositions and memods for inhibiting the multidrug resistance function of the P-protein during chemotherapy treatment of cancers so that the cytotoxic drugs administered to patients are not excluded from the cancer cell.
- the compositions and memods should not be toxic to other cells or tissues, and should specifically inhibit the ability of P-glycoprotein to confer multidrug resistance on cells.
- the present invention generally involves methods and compositions for reducing or mitigating multidrug resistance in cancer cells and tissues.
- the present invention more particularly involves antigenic P-glycoprotein-containing compositions that, when administered to a human or animal wim a multidrug resistance cancer or tumor, elicit the production of antibodies specific for certain portions of the P-glycoprotein molecule which reduce multidrug resistance, thus making the cancer or tumor more sensitive to anti-cancer drugs.
- P-glycoprotein-containing compositions include liposomes having portions of P-glycoprotein externally presented on their surfaces, P-protein peptide fragments, modified P-protein fragments and liposomes containing P-protein peptide fragments and/or modified P-protein peptide fragments.
- the present invention also encompasses mixtures of at least one adjuvant and at least one of the above identified P-glycoprotein-containing compositions. It is contemplated diat one or more of the aforementioned compositions can be used as a vaccine to reduce multidrug resistance in cancer cells in a human or animal with the cancer.
- the present invention also includes antibodies specific for externally accessible regions or epitopes of the P-protein.
- these antibodies would be produced by and purified from humans with strong immune systems, and injected into patients with weak or non-functional immune systems in need of such circulating antibodies.
- multidrug resistance in cells and tissues can be reduced eithe r by active immunization of an individual having multidrug resistance using antigenic P-glycoprotein-containing compositions or by passive immunization via administering an antibody or a group of antibodies specific for P-protein epitopes.
- Another object of the present invention is to provide P-glycoprotein-containing compositions that are antigenic and elicit an immune response against P-glycoprotein.
- Yet another object of the present invention is to provide P-protein peptide fragments modified with antigenic carriers to increase the antigenic response to P-protein peptide fragments, and methods of use thereof.
- Another object of the present invention is antibodies specific to externally exposed regions of P-glycoprotein useful for passively immunizing a human or animal and thereby reducing multidrug resistance.
- Figure 1 is a schematic representation of the putative structure of P-protein and its orientation in the membrane of a liposome.
- Figure 2 represents a P-protein peptide fragment modified at one end with a lipophilic moiety and inserted into a lipid bilayer resulting in a "tail presentation.”
- Figure 3 represents a P-protein peptide fragment modified at both ends with lipophilic moieties and inserted into a lipid bilayer resulting in a "loop presentation.”
- Figure 4 is a graph illustrating the percent cells surviving as a function of accumulation in the cells of doxorubicin.
- Figure 5 is a histogram illustrating the level of fluorescence intensity, indicating the level of anti-P-protein peptide binding, as a function of exposure to various doxorubicin concentrations.
- Figure 6A is a dot blot determination in which antibodies directed against the liposome carrier alone were incubated with the 38-mer, 16-mer and 14-mer mouse P-protein peptide fragments, SEQ. ID. NOS: 1, 2, and 4, respectively.
- Figure 6B is a dot blot determination in which antibodies directed against the liposome carrier alone were incubated with the 38-mer, 16-mer and 14-mer mouse P-protein peptide fragments, SEQ. ID. NOS: 1, 2, and 4, respectively.
- Figure 7A is a dot determination in which antibodies directed against a mixture of P-protein peptide fragments (38-mer, 16-mer, 9-mer, and 14-mer; SEQ. ID. NOS: 1-4, respectively) in liposomes are incubated with 38-mer, 16-mer, and 14-mer P-protein peptide fragments, SEQ. ID. NOS: 1, 2, and 4, respectively.
- Figure 7B is a dot blot determination in which antibodies directed against a mixture of P-protein peptide fragments (38-mer, 16-mer, 9-mer, and 14-mer; SEQ. ID. NOS: 1-4, respectively) in liposomes are incubated with 38-mer, 16-mer, and 14-mer P-protein peptide fragments, SEQ. ED. NOS: 1, 2, and 4, respectively.
- the present invention comprises methods and compositions for reducing multidrug resistance in a human or animal.
- the antigenic P-glycoprotein-containing compositions of the present invention include, but are not limited to, P-glycoprotein containing liposomes, P-protein peptide fragments, P-protein peptide fragments combined with adjuvants, modified P-protein peptide fragments, modified P-protein peptide fragments combined with adjuvants, liposomes containing P-protein peptide fragments, and liposomes containing modified P-protein peptide fragments. Still further, the present invention includes antibodies directed against, and specific for, the externally accessible portions of P-glycoprotein.
- P-glycoprotein refers to a membrane bound glycosylated protein having amino acid sequences externally exposed on the outer surface of cells which confers multidrug resistance to diose cells.
- P-protein refers to the amino acid sequence of P-glycoprotein without carbohydrate groups attached.
- P-protein peptide refers to incomplete amino acid sequences of P-protein or peptide fragments of P-protein.
- antigenic carrier refers to substances which when bound to P- glycoprotein, P-protein, P-protein fragments, or modified P- protein peptide fragments, elicit or enhance an immune response against P-glycoprotein in humans or animals.
- the term "effective amount” refers to the amount of P-glycoprotein, P- protein, P-protein fragments, or modified P-protein peptide fragments, which when administered to a human or animal causes a reduction in multidrug resistance and increased sensitivity to chemotiierapeutic agents.
- the effective amount can be readily determined by one of skill in the an following routine procedures.
- P-peptide compositions may be administered in a range of approximately 100 ug to 1 mg per patient, though this range is not intended to be limiting. This approximate range of administration has been used, e.g., for peptide vaccines for malaria.
- the actual amount of P-glycoprotein composition required to elicit an immune response will vary for each individual patient depending on the antigenicity of the P-glycoprotein composition administered and on the immune response of the individual. Consequently, the specific amount administered to an individual will be determined by routine experimentation and based upon the experience of one skilled in the art.
- mouse P-glycoprotein exposes on the surface of a liposome six peptide loops having sequences of 9 to 38 amino acids each.
- Human P-glycoprotein has 5 externally exposed peptide loops.
- the amino acid sequences of these externally exposed loops are an essential feature of the invention.
- These sequences are incorporated into the P-protein-containing compositions of the present invention, which may be used to directly immunize a human or animal having a cancer or tumor that is resistant to many drugs.
- induced autoimmunity against P-glycoprotein is not harmful.
- the P-glycoprotein containing compositions of the present invention may be used to produce antibodies directed against externally exposed regions or epitopes of P-protein. These antibodies can be administered to multidrug resistant individuals to passively immunize them against P-glycoprotein and the reby reduce multidrug resistance.
- the present invention encompasses P-glycoprotein inserted into liposomes so as to present on the liposome surface portions of P-glycoprotein normally exposed on cell surfaces.
- Such liposomes may be made by reconstituting liposomes in the presence of purified or partially purified P-glycoprotein.
- P-protein peptide fragments mat correspond to extemally presented loops of P-protein, i.e. diose portions of the P-protein presented on the outside of cell surfaces and accessible to antibodies are encompassed by the present invention.
- the present invention also includes P-protein peptide fragments modified so as to increase tiieir antigenicity, for example by the attachment of antigenic carriers, and adjuvant mixtures thereof.
- adjuvants include, but are not limited to, lipophilic muramyl dipeptide derivatives, nonionic block polymers, aluminum hydroxide or aluminum phosphate adjuvant, and mixtures thereof.
- the present invention further encompasses P-protein fragments modified with lipophilic moieties, such as palmitic acid, diaf facilitate insertion into liposomes so that the P-protein orients itself in the liposome membrane in a manner similar to its orientation in natural membranes.
- Lipophilic moieties of the present invention may be fatty acids, triglycerides and phospholipids wherein the fatty acid carbon back bones have at least 10 carbon atoms. Most preferable are lipophilic moieties having fatty acids with a carbon backbone of at least approximately 14 carbon atoms and up to approximately 24 carbon atoms. The most preferred lipophilic moieties have a carbon backbone of at least 14 carbon atoms.
- lipophilic moieties include, but are not limited to, palmitic acid, stearic acid, myristic acid, lauric acid, oleic acid, linoleic acid, and linolenic acid.
- the most preferred lipophilic moiety is palmitic acid.
- a P-protein peptide fragment (10) may be modified by coupling to it a lipophilic moiety (12) which facilitates insertion of the molecule into a liposome membrane (14) resulting in a "tail presentation.”
- a lipophilic moiety (12) which facilitates insertion of the molecule into a liposome membrane (14) resulting in a "tail presentation.”
- Another possible modified P-protein peptide fragment is depicted in Fig. 3, where a peptide fragment (16) is modified at both ends of the amino acid sequence with lipophilic moieties (18), which can be either the same or different moieties, so as to facilitate insertion into a liposome membrane (20) resulting in a "loop presentation.”
- P-protein peptide fragments and modified P-protein peptide fragments, and adjuvant mixtures thereof, as well as the above-described liposome compositions can be administered to a human or animal to induce immunity to certain regions of P-glycoprotein thereby reducing that individual's multidrug resistance.
- This induced autoimmunity is not deleterious to healdiy individuals, as shown in Table 2.
- the human or animal After the human or animal has been immunized against the P-protein, the human or animal will have circulating antibodies against P-protein which bind to the externally exposed portions of P-protein, thereby reducing or inactivating its ability to confer multidrug resistance on the cell.
- Antibodies can be made by memods mat are well known to those of ordinary skill in the art, as described, for example, in Alving, C.R. et al. Proc. Nat'l. Acad. Sci. USA (1992) 89:358-362, and Alving, C.R., J. Immuno. Meth. (1991) 140 : 1 - 13. hereby incorporated by reference.
- the anti-P-protein antibodies can be administered to a human or animal by any appropriate means, preferably by injection, to reduce the multidrug resistance activity of P- glycoprotein.
- a patient undergoing chemotherapy for a cancer diagnosed as being multidrug resistant, or developing multidrug resistance may be treated with P-glycoprotein reconstituted in liposomes or with antigenic peptide fragments thereof to produce circulating anti-P-protein antibodies.
- a anti-P-protein antibody preparation can be administered to the patient preferably before the administration of the chemotherapeutic drug or drugs. Whether internally produced or provided from external sources, the circulating antibodies will bind to the exposed portions of the P-glycoprotein and reduce or inactivate its ability to exclude drugs from the cell.
- the gene or genes encoding the human multidrug transport system are cloned from human multidrug-resistant KB cells by selecting for resistance to high levels of colchicine, vinblastine, or doxorubicin (Adriamycin). These cells contain many minute and double minute chromosomes, and by ingel renaturation analysis, amplified DNA segments common to all these cell lines are identified in their genomic DNA. By homology with similarly amplified sequences in multidrug-resistant Chinese hamster cells, two related human genomic sequences are isolated from multidrug-resistant KB cells. These were designated MDR1 and MDR2. MDR1 and MDR2 are genetically linked and map to chromosome 7q.
- a 4.5-kilobase mRNA corresponding to me MDR1 gene only, is found to correlate with drug resistance in many different multidrug resistant cells.
- genomic MDR1 probe overlapping cDNA segments for the entire MDR1 RNA is obtained and sequenced. This full-length cDNA encodes the cell surface 170,000-Dalton P-protein. Similar MDR cDNAs have been cloned and completely sequenced from the mouse. Based on over expression of the MDR RNA in multidrug-resistant cells, cDNA clones from the mouse and hamster can also be obtained.
- Liposomes that can be used in the compositions of the present invention include all those known to one skilled in the art. Any of the standard lipids useful for making liposomes may be used. Monolayer, bilayer and multi-layer liposomes may be used to make compositions of the present invention. While any method of making liposomes known to one skilled in the art may be used, the most preferred liposomes are made according to the method of Alving et al., Infect. Immun. 60:2438-2444, 1992, hereby incorporated by reference. The liposome can optionally contain a detoxified Lipid A such as Monophosphoryl lipid A (Ribi Immunochem. Hamilton Montana).
- a detoxified Lipid A such as Monophosphoryl lipid A (Ribi Immunochem. Hamilton Montana).
- a full-length mdr c-DNA (clone MDR1 1) is obtained from Dr. Housman.
- the baculovirus expression vector is constructed as described in Webb, N.R. et al. (1989) Proc. Natl. Acad. Sci. USA 86, 7731-7735, hereby incorporated by reference.
- a recombinant baculovirus (Ac-P) containing a cDNA encoding full-lengdi P-protein under transcriptional regulation of the polyhedrin promoter is produced by co-transfecting pAc-P DNA with wild type Autographa californica nuclear polyhedrosis virus (AcMNPV) DNA by calcium phosphate precipitation.
- the occlusion-negative virus will be plaque-purified and propagated in Spodoptera frugiperda 9 cells.
- the resulting virus is used to infect Sf-9 cells in airlift fermentors as described in Webb, N.R. et al. (1989) Proc. Natl. Acad. Sci. USA 86, 7731-7735. Extraction and purification of the P-protein is performed as described in Webb, et al.
- the Sf-9 cells expressing the P-protein is subjected to flow cytometry analysis using an FITC-stained goat anti-mouse antibody and a monoclonal antibody against the protein.
- the purified P-protein assayed by gel electrophoresis and immunoblotting, is electroinserted (Mouneime, Y., et al., 1990, Biochem., hereby incorporated by reference) in large liposomes containing lipid A and injected i.m. to mice.
- Antibodies elicited against P-protein are determined by ELISA, using the recombinant protein and horse-radish peroxidase-conjugated goat anti-mouse immuno globulins.
- P-protein peptide fragments representing the externally located extracellular regions of P-protein in mice and humans have been synthesized and are shown in Table 3.
- the peptide fragments can be further modified, at eithe r the N- and C- terminus, or both, by addition of carriers or other moieties that render the P-protein peptide more antigenic and by lipophilic moieties such as palmitic acid using standard memods well known in the art.
- Sera containing the anti-P-protein antibodies are produced and used in vitro to sensitize mdr L1210 and KD cells to adriamycine, vincristine, doxorubicin and otiier chemotherapy drugs.
- Mice are inoculated with the mdr mice leukemia L1210 cells. After developing the disease, a group of the sick mice is immunized with P-protein-liposomes-lipid A and tiieir survival after treatment with chemotherapy agents compared to diat of the positive control group, subjected to the same chemotherapy.
- antibodies directed against a mixture of all four mouse P-protein peptide fragments SEQ. ID NOS: 1-4
- modified with liposomes inserted in the "loop presentation" as shown in Figure 3 antipeptide
- antibodies directed against liposomes not containing P-protein peptide fragments were raised in mice.
- Table 4 shows an exemplary liposome composition used to immunize mice.
- Table 4 Composition of the Liposome-Peptide Antigen
- Multidrug resistant L1210 cells were tiien incubated with and widiout the antibodies and subsequently challenged with the chemotherapy drug doxorubicin. Normal L1210 cells were used as an additional control. It was found that cells treated with antipeptide antibody became more sensitive to the drug, as illustrated in Table 5.
- Figure 4 illustrates the finding that multidrug resistant LI 210 cells treated with increasing titers of anti-P- protein antibody accumulate increased levels of doxorubicin and have a correspondingly decreased survival percentage.
- Figure 5 illustrates the finding that tiiere is a correlation between binding of anti-P-protein antibody to MDR L1210 cells and the accumulation within the cells of doxorubicin. The amount of antibody bound to, and doxorubicin accumulated widiin, the cells was measured by fluorescence. Consols using antibodies directed only against the liposomal carrier showed high antibody binding to the cells widiout a corresponding increase in doxorubicin accumulation. These results demonstrate that anti-P-protein antibodies are effective in decreasing multidrug resistance.
- Figures 6 a and 6 b represent duplicate dot blot determinations in which antibodies directed against the liposome carrier alone were incubated widi the 38-mer, 16-mer and 14-mer mouse P-protein peptide fragments, SEQ. ID. NOs: 1, 2 and 4, respectively.
- Figures 7a and 7b which represent duplicate dot blot determinations in which antibodies directed against a mixture of P-protein peptide fragments (38-mer, 16-mer, 9-mer and 14-mer; SEQ. ID. NOS: 1-4, respectively) in liposomes are incubated with 38-mer, 16-mer and 14-mer P-protein peptide fragments, SEQ. ID. NOS: 1, 2 and 4, respectively.
- antipeptide serum reacts with the mouse 16-mer and 14-mer, SEQ. ID. NOS: 2 and 4, respectively.
Abstract
Description
Claims
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EP94914250A EP0669941A1 (en) | 1992-11-02 | 1993-11-02 | Method of reducing multidrug resistance in cells and tissues |
AU54204/94A AU5420494A (en) | 1992-11-02 | 1993-11-02 | Method of reducing multidrug resistance in cells and tissues |
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FR2857875A1 (en) * | 2003-07-25 | 2005-01-28 | Univ Reims Champagne Ardenne | Immunogenic composition containing fatty acid-modified peptides from protein P-170, useful e.g. for reversing multidrug resistance of cancer cells |
US7294701B2 (en) * | 2003-04-02 | 2007-11-13 | Technion Research & Development Foundation Ltd. | Antibody fragment capable of modulating multidrug resistance and compositions and kits and methods using same |
US7807171B2 (en) | 2003-07-25 | 2010-10-05 | Ac Immune Sa | Therapeutic vaccine targeted against P-glycoprotein 170 for inhibiting multidrug resistance in the treatment of cancers |
JP2011251964A (en) * | 2004-02-20 | 2011-12-15 | Ac Immune Sa | Method and composition comprising supramolecular construct |
WO2012055933A1 (en) * | 2010-10-26 | 2012-05-03 | Ac Immune S.A. | Liposome-based construct comprising a peptide modified through hydrophobic moieties |
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