EP0519986A1 - Polypeptides synthetiques - Google Patents

Polypeptides synthetiques

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Publication number
EP0519986A1
EP0519986A1 EP91906077A EP91906077A EP0519986A1 EP 0519986 A1 EP0519986 A1 EP 0519986A1 EP 91906077 A EP91906077 A EP 91906077A EP 91906077 A EP91906077 A EP 91906077A EP 0519986 A1 EP0519986 A1 EP 0519986A1
Authority
EP
European Patent Office
Prior art keywords
gly
amino acid
leu
ala
ser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91906077A
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German (de)
English (en)
Inventor
Robert Vincent Fishleigh
Barry Robson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Protherics Medicines Development Ltd
Original Assignee
Proteus Molecular Design Ltd
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Filing date
Publication date
Application filed by Proteus Molecular Design Ltd filed Critical Proteus Molecular Design Ltd
Publication of EP0519986A1 publication Critical patent/EP0519986A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/005—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from viruses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/08—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses
    • C07K16/10—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses from RNA viruses
    • C07K16/1036—Retroviridae, e.g. leukemia viruses
    • C07K16/1045—Lentiviridae, e.g. HIV, FIV, SIV
    • C07K16/1063—Lentiviridae, e.g. HIV, FIV, SIV env, e.g. gp41, gp110/120, gp160, V3, PND, CD4 binding site
    • 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
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2740/00—Reverse transcribing RNA viruses
    • C12N2740/00011—Details
    • C12N2740/10011—Retroviridae
    • C12N2740/16011—Human Immunodeficiency Virus, HIV
    • C12N2740/16111—Human Immunodeficiency Virus, HIV concerning HIV env
    • C12N2740/16122—New viral proteins or individual genes, new structural or functional aspects of known viral proteins or genes

Definitions

  • the present invention relates to synthetic polypeptides. It particularly relates to synthetic polypeptides which emulate the three-dimensional structures and/or electrostatic surfaces and/or other physical, chemical and structural properties of specific regions of viral envelope proteins. It is of particular interest to the design of vaccines, immunologically active therapeutic agents, diagnostics and other medical or scientific agents in relation to the Human Immunodeficiency Virus (HIV) known to be the causative agent of Acquired Immune Deficiency Syndrome (AIDS) .
  • HIV Human Immunodeficiency Virus
  • AIDS Acquired Immune Deficiency Syndrome
  • An object of the present invention is the development of synthetic polypeptides which can elicit the production of antibodies to the HIV virus, and most preferably neutralising antibodies, that is, antibodies which prevent infection by and/or limit the spread of the HIV virus by passive or active immunisation. Passive immunisation with such antibodies may constitute an effective means of treatment of AIDS patients thus controlling the spread of the virus within and between individuals and hence slow or halt the progress of the disease.
  • Our invention provides a synthetic polypeptide having at least one antigenic property of the envelope protein of at least one strain of Human Immunodeficiency Virus (HIV) , said polypeptide consisting substantially of an amino acid sequence of formula (I):-
  • R 1 is Asp or Glu
  • R- is an amino acid residue selected from
  • R 3 is an amino acid residue selected from Gly, Ala, Pro, Ser, Thr, Asp, Glu, Asn, Lys, His, Gin or Arg;
  • R 4 , R 5 and R.,. are each independently any amino acid residue;
  • R 6 and R 8 are each independently an amino acid residue selected from Gly, Ala, Pro, Ser, Thr, or Asn;
  • R 7 is an amino acid residue selected from Gly, Ala, Val, Leu, lie, Ser, Thr, Asn, Gin, Phe, Tyr, Trp, Cys, Met or Pro;
  • R_ and R 12 are each independently an amino acid residue selected from Gly,
  • R 10 is an amino acid residue selected from Lys, His or Arg; and X and Y may each independently be absent or independently be one or more, e.g. 3, additional amino acid residues.
  • Peptides according to formula I above without X and Y being present will of course be useful, for example, in the production of antibodies to the HIV. However, when X or Y are present they may be any length but preferably less than 20 amino acids, more preferably less than 10, eg. 3 to 6. It will of course be appreciated that the sequence according to formula I may constitute a protein with X and Y being major portions of the protein with the antigenic sequence being for example, part of an exposed loop on a globular protein.
  • R 2 is selected from Gin or Thr
  • R 3 is selected from Ser, Asn, Gin, Arg or Ala
  • R is selected from Leu, lie, Gin or Arg
  • R 5 is either Leu or Lys
  • R 6 is either Gly or Asn
  • R 7 is selected from Gly, Ala, Leu, lie, Val, Met, Cys, Phe, Tyr, Trp or Ser
  • R- is either Ser or Ala
  • R g is either Gly or Phe
  • R 10 is either Arg or Lys
  • R. is selected from Leu, His, lie
  • Gin and R 12 is selected from Ala, lie or Val.
  • the Cys residues at positions 10 and 16 may optionally be linked by an intra-molecular disulphide bridge.
  • One preferred form of polypeptide according to the invention consists substantially of an amino acid sequence of formula (II) :-
  • R 3 , R 5 , R n , R 12 , X and Y are as defined above; and R 7 is an amino acid residue selected from
  • R 3 is selected from Ser, Asn, Gin and Arg, R is selected from Leu, His or lie and R 12 is lie or Ala.
  • R 7 is selected from lie, Phe, Met, Val or Leu. More preferably R- is either Ser or Asn and R 5 is Lys.
  • polypeptide of formula (II) consists of the sequence:-
  • polypeptide of Formula 5 (II) comprises R 3 selected from Gin or Arg, R 5 is Leu, R 7 is selected from lie, Phe and Met, R ⁇ is selected from Leu, His or lie, and R 12 is Ala.
  • a preferred sequence has the formula:-
  • polypeptide according to the invention consists substantially of an amino acid sequence of formula (III):- 20
  • R 1 is either Glu or Asp
  • R 2 is Thr or Gin
  • 25 R 3 is an amino acid selected from Ser, Asn
  • R 4 is an amino acid selected from Leu, He, Arg or Gin; R ⁇ is Lys or Leu; and 30 wherein X and Y are as defined above, and the Cys residues at positions 10 and 16 may optionally be linked by an intra-molecular disulphide bridge.
  • a preferred form of a polypeptide according to 3 . 5 Formula III consists substantially of an amino acid sequence of formula (Ilia) :- X-Glu-Thr-R 3 -R 4 -Lys-Asn-Ser-Trp-Gly- Cys-Ala-Phe-Arg-Gln-Val-Cys-Y
  • R 3 is an amino acid residue selected from Ser, Asn, Arg, Gin or Ala
  • 4 is an amino acid residue selected from Leu, He, Arg or Gin
  • X and Y are as defined above, and the Cys residues at positions 10 and 16 may optionally be linked by an intra-molecular disulphide bridge, it is preferred that R 3 is Ser when R 4 is He and when R 3 is Ala R 4 is either Arg or Gin but preferably Arg.
  • Polypeptides according to formula III are similar to certain epitopes of HIV II envelope proteins.
  • Preferred polypeptide sequences according to the invention were chosen on the basis of their topographical similarity to more than one antigenic determinant of the HIV envelope proteins.
  • an antigenic determinant to which a given polypeptide was originally designed to be an analogue may also show topographical similarity to one or more other regions of the HIV envelope proteins possibly due to duplication of ancestral genes, or because the polypeptide is an analogue of a discontinuous determinant, or because the polypeptides have been designed to be polyvalent.
  • a discontinuous epitope may be viewed as being composed of closely opposed sequential epitopes which may be of antigenic significance in their own right and a polyvalent polypeptide may contain two or more (continuous or discontinuous) determinant analogues in a single polypeptide chain, thus providing a means to simultaneously elicit the production of a range of antibodies which will recognise two or more determinants on the HIV envelope proteins.
  • Peptides according to the invention may be synthesised for example using either standard 9- fluorenyl-methoxycarbonyl (F-Moc) chemistry (see, for example, Atherton, E. and Sheppard, R. C. (1985) J. Chem. Soc. Chem. Comm.
  • Polypeptides according to the invention or antibodies thereto may be administered on their own or with other agents such as 3 '-azido-3 '-deoxythymidine (AZT) (zidovudine) , which acts at a different level by interfering with the replication of the genetic material of the virus, and/or HIV protease inhibitors, which block the action of an enzyme essential to the development of the virus.
  • ZT 3 '-azido-3 '-deoxythymidine
  • HIV protease inhibitors which block the action of an enzyme essential to the development of the virus.
  • Polypeptides according to the invention may be used to raise antibodies which will cross-react with envelope proteins produced by a wide range of HIV I and/or HIV II strains. Our analyses have shown that since the conformational/topographic/electrostatic properties of polypeptides according to the invention are such that they are highly likely to elicit the production of antibodies which will cross-react with HIV envelope proteins from several or many strains, further advantages may arise from combining several variant polypeptides in a larger polypeptide.
  • Such a polypeptide may have the general formula (IV) :
  • F and G may each independently be a polypeptide according to any one of Formulae I to Ilia
  • L is a linking sequence
  • a, b and c are each independently 0 or 1 and and n are each positive numbers e.g. between 1 and 10 inclusive.
  • L is preferably a short, conformationally flexible section of polypeptide chain such as, for example and without limit Gly-Gly-Gly-Gly- Gly, Gly-Pro-Gly-Pro-Gly-Pro or Gly-Ser-Ala-Gly-Ser-Gly- Ala. It should be clear that each repeat may optionally have a different variant of a polypeptide according to the invention.
  • Polyvalent determinant analogues as defined by Formula IV are referred to as pseudohomopolyvalent, wherein variants of essentially the same determinant analogue are repeated in a single polypeptide chain.
  • pseudohomopolyvalent polypeptide im unogens which contain multiple copies of the same variant of one of the determinant analogues according to any one of formulae I to Ilia, would also be expected to be effective, and are also included within the scope of the present invention.
  • Pseudohomopolyvalent immunogenic polypeptides are expected to be particularly valuable as vaccines, where they should elicit the production of a range of (neutralising) antibodies with a similar but non-identical underlying specificity, which between them would cross-react with envelope protein from a wider range of HIV strains, and would thus be more effective at conferring protective immunity.
  • heteropolyvalent polypeptides which contain one or more copies, in any order, of one of the polypeptides according to the present invention and one or more other polypeptide analogues of determinant analogues.
  • Such polypeptides which are provided for in the present invention, have the general formula (V) :
  • F is a polypeptide according to any one of Formulae I to Ilia
  • G is a polypeptide according to any one of Formulae I to Ilia or other sequence
  • m and n are each positive numbers e.g. between 1 and 10 inclusive
  • d and e are each independently 0 or 1.
  • L is preferably a short, conformationally flexible section of polypeptide chain such as, for example and without limit Gly-Gly-Gly-Gly-Gly, Gly-Pro-Gly-Pro-Gly-Pro or Gly-Ser-Ala-Gly-Ser-Gly-Ala.
  • G may comprise a polypeptide according to any one of Formula I to Ilia or the sequence:
  • each Gly may independently be replaced with any other amino acid and/or X and Y may each independently be absent or one or more e.g. three amino acid residues or G may comprise some other polypeptide sequence related to antigenic proteins from HIV.
  • any antigenically significant subfragments and/or antigenically significant variants of the above-identified polypeptide sequences which retain the general form and function of the parent polypeptide are included within the scope of this invention.
  • the substitution of any of the specific residues by residues having comparable conformational and/or physical properties, including substitution by rare (but naturally occurring, e.g. D-stereoisomers) or synthetic amino acid analogues is included.
  • substitution of a residue by another in the same Set is included within the ambit of the invention; Set 1 - Ala, Val, Leu, He, Phe, Tyr, Trp and Met; Set 2 - Ser, Thr, Asn and Gin; Set 3 - Asp and Glu; Set 4 - Lys, His and Arg; Set 5 - Asn and Asp; Set 6 - Glu and Gin; Set 7 - Gly, Ala, Pro, Ser and Thr.
  • D-stereoisomers of all amino acid types may be substituted, for example, D-Phe, D-Tyr and D-Trp.
  • X and Y if present may independently include one or more segments of protein sequence with the ' ability to act as a T-cell epitope.
  • Lys, Arg, His, Glu, Asp, Asn, Gin, Ser, Thr, Pro appear to act as T-cell epitopes in at least some instances (Rothbard, J.B. & Taylor, W.R. (1988) . A sequence pattern in common to T-cell epitopes. The EMBO Journal 7(1): 93-100). Similarly segments can be of the sequence 1'-2 '-3 '-4 '-5 ' , wherein 1' is equivalent to 1 as defined earlier, 2 1 to 2 , 3' and 4' to 3, and 5 ' to 4 (ibid) .
  • T-cell epitopes preferably less than five which may be of the type defined above or may be of other structure and which may be separated by spacer segments of any length or composition, preferably less than five amino acid residues in length and comprising for example residues selected from Gly, Ala, Pro, Asn, Thr, Ser or polyfunctional linkers such as non- amino acids. It is possible for a C- or N-terminal linker to represent a complete protein, thus obviating the possible need for conjugation to a carrier protein. Also included within the scope of this invention are derivatives of the polypeptide according to formula I in which X or Y are or include a "retro-inverso" amino acid, i.e. a bifunctional amine having a functional group corresponding to an amino acid. For example an analogue according to the invention and containing a retro-inverso amino acid may have the formula:
  • R is any functional group, e.g. a glycine side chain
  • Al and A2 are preferably each a copy of one of the analogues defined herein (but not necessarily the same) attached by its N- or C-terminal end.
  • T-cell epitopes may optionally be included as discussed earlier.
  • Retro-inverso modification of peptides involves the reversal of one or more peptide bonds to create analogues more resistant than the original molecule to enzymatic degradation and offer one convenient route to the generation of branched immunogens which contain a high concentration of epitope for a medium to large immunogen.
  • the use of these compounds in large-scale solution synthesis of retro-inverso analogues of short- chain biologically active peptides has great potential. It should be noted that analogues incorporating retro-inverso amino acid derivatives cannot be made directly using a recombinant DNA system.
  • the basic analogues can, and they can then be purified and chemically linked to the retro-inverso amino-acids using standard peptide/organic chemistry.
  • a practical and convenient novel procedure for the solid-phase synthesis on polyamide-type resin of retro-inverso peptides has been described recently [Gazerro, H. , Pinori, M. & Verdini, A.S. (1990).
  • polypeptides are optionally linked to a carrier molecule, either through chemical groups within the polypeptides themselves or through additional amino acids added at either the C- or N-terminus, and which may be separated from the polypeptides themselves or surrounded by one or more additional amino acids, in order to render them optimal for their immunological function.
  • linkages are suitable and include for example use of the side chains of Tyr, Cys and Lys residues.
  • Suitable carriers include, for example, purified protein derivative of tuberculin (PPD) , tetanus toxoid, cholera toxin and its B subunit, ovalbumin, bovine serum albumin, soybean trypsin inhibitor, muramyl dipeptide and analogues thereof, and Braun's lipoprotein although other suitable carriers will be readily apparent to the skilled person.
  • PPD tuberculin
  • tetanus toxoid cholera toxin and its B subunit
  • ovalbumin bovine serum albumin
  • soybean trypsin inhibitor muramyl dipeptide and analogues thereof
  • Braun's lipoprotein although other suitable carriers will be readily apparent to the skilled person.
  • PPD is expected to be a preferred carrier for use in such countries.
  • the mode of coupling the polypeptide to the carrier will depend on the nature of the materials to be coupled.
  • a lysine residue in the carrier may be coupled to a C-terminal or other cysteine residue in a polypeptide by treatment with N- 7 -maleimidobutyryloxy-succinimide (Kitagawa, T. & Ackawa, T. (1976) J. Biochem. 79 . , 233) .
  • Other coupling reactions and reagents have been described in the literature.
  • polypeptides may be administered by any route (eg parenteral, nasal, oral, rectal, intra-vaginal) , with or without the use of conventional adjuvants (such as aluminium hydroxide or Freund•s complete or incomplete adjuvants) and/or other immunopotentiating agents.
  • the invention also includes formulation of polypeptides according to the invention in slow-release forms, such as a sub-dermal implant or depot comprising, for example, liposomes (Allison, A.C. & Gregoriadis, G. (1974) Nature (London) 252, 252) or biodegradable microcapsules manufactured from co-polymers of lactic acid and glycolic acids (Gresser, J. D. and Sanderson, J. E. (1984) in "Biopolymer Controlled Release Systems” pp 127-138, Ed. D. L. Wise).
  • polypeptides according to the invention may be synthesised by any conventional method, either directly using manual or automated peptide synthesis techniques as mentioned above, or indirectly by RNA or DNA synthesis and conventional techniques of molecular biology and genetic engineering. Such techniques may be used to produce hybrid proteins containing one or more of the polypeptides inserted into another polypeptide sequence.
  • Another aspect of the present invention therefore provides a DNA molecule coding for at least one synthetic polypeptide according to the invention, preferably incorporated into a suitable expression vector replicable in microorganisms or in mammalian cells.
  • the DNA may also be part of the DNA sequence for a longer product e.g. the polypeptides may be expressed as parts of other proteins into which they have been inserted by genetic engineering.
  • One practical guide to such techniques is "Molecular cloning: a laboratory manual" by Sambrook, J., Fritsch, E.F. and Maniatis, T. (2nd Edition, 1989) .
  • Polypeptides according to the invention may be used either alone or linked to an appropriate carrier, as:
  • antigenic agents for the generation of monoclonal or polyclonal antibodies by immunisation of an appropriate animal such antibodies being of use for (i) the scientific study of the HIV virus, (ii) as diagnostic agents, e.g. as part of histochemical reagents, (iii) for the passive immunisation of HIV patients, either as a treatment for AIDS in itself, or in combination with other agents such as, for example
  • AZT and/or HIV protease inhibitors as a means of targeting other agents (e.g. AZT or HIV protease inhibitors) to HIV infected cells expressing HIV envelope proteins on their surfaces, such agents either being linked covalently or otherwise associated, e.g. as in liposomes containing such agents and incorporating antibodies raised against any of the antigenic polypeptides.
  • agents e.g. AZT or HIV protease inhibitors
  • the invention further provides for genetically engineered forms or sub-components, especially V H regions, of antibodies raised against the polypeptides, and of humanised forms of antibodies initially raised against the polypeptides in other animals, using techniques described in the literature; and (e) The treatment of HIV infections, either by displacing the binding of HIV virus to human or animal cells or by disturbing the three-dimensional organisation of the virus in vivo; as well as aiding the scientific study of HIV viruses in vitro.
  • detection and diagnosis, of HIV or antibodies against HIV the skilled person will be aware of a variety of immunoassay techniques known in the art, inter alia, sandwich assay, competitive and non- competitive assays and the use of direct and indirect labelling.
  • a further aspect of the invention provides a kit for detecting HIV or antibodies against HIV which comprises at least one synthetic polypeptide according to the invention.
  • Antibodies according to the invention are, inter alia, of use in a method of diagnosing mammalian HIV infection which comprises incubating a sample of tissue or body fluid of mammal with an effective amount of antibody as described herein and determining whether, and if desired the extent to which and/or rate at which, cross-reaction between said sample and said antibody occurs. Diagnostic kits which contain at least one of said antibodies also form part of this invention.
  • a further aspect of the invention provides synthetic polypeptides for use in therapy or prophylaxis of mammalian HIV infection and/or stimulating the mammalian immune system and/or blocking the cellular receptors for the HIV virus and for the preparation of medicaments suitable for such uses.
  • pharmaceutical compositions containing, as active ingredient, at least one polypeptide or polypeptide-carrier conjugate as described herein in association with one or more pharmaceutically acceptable adjuvants, carriers and/or excipients.
  • the compositions may be formulated for oral, rectal, nasal or especially parenteral administration (including intra-CNS administration) .
  • the invention further provides a method of therapy or prophylaxis of mammalian HIV infection and/or of stimulating the mammalian immune system and/or of blocking the cellular receptors for the HIV virus, which comprises administering an effective amount of a polypeptide as hereinbefore defined, either in isolation or in combination with other agents for the treatment of AIDS such as AZT and/or inhibitors of the HIV protease.
  • a polypeptide as hereinbefore defined, either in isolation or in combination with other agents for the treatment of AIDS such as AZT and/or inhibitors of the HIV protease.
  • Example 1 A C-terminally extended form of basic peptide (a) with sequence
  • the peptide was dissolved in phosphate-buffered saline (PBS; 5mg/ml) and mixed with an equal volume of ovalbumin (5mg/ml) prior to the addition of glutaraldehyde to a final concentration of 0.1%(w/v).
  • PBS phosphate-buffered saline
  • ovalbumin 5mg/ml
  • the conjugate mixture was allowed to stand for 30 minutes prior to emulsification with Freund's adjuvant.
  • Each sheep was immunised with 250 ⁇ g of peptide in Freund's complete adjuvant (FCA) and subsequently (14 days) challenged with a further similar quantity in Freund's incomplete adjuvant (FIA) . Further challenges were performed after a period of 3-4 weeks in FIA.
  • CVl monkey kidney cells grown in monolayer cultures in 96-well microtitre plates, were infected with the recombinant vaccinia virus.
  • the virus construct contained the gene encoding the HIV envelope glycoprotein and this is known to be processed and expressed on the surface of the infected cells.
  • Antisera from sheep were assayed in duplicate. A quantity of 50 ⁇ l of antiserum at various dilutions was added to the wells and incubated for 4 hours prior to washing (twice) and adding a second peroxidase-labelled anti-sheep antiserum.
  • Example 2 One role of neutralising antibodies is to inhibit the transmission of virus from infected to non-infected cells. Preventing or reducing the rate of transmission of virus from T-cells to macrophages is crucial since this may extend the life of AIDS patients considerably Anti-peptide antisera were assayed for their ability to inhibit syncitia formation in vitro. Syncitia are multinucleated giant cells which result from "bridge"-formation between HIV-infected cells.
  • the anti-peptide antisera were used in an in vitro HIV neutralisation assay.
  • the anti-peptide antibodies were introduced into an in vitro culture of human T-lymphocytes infected with a highly virulent strain of HIV, and uninfected human macrophages.
  • the anti-peptide antisera were found to inhibit syncitia formation amongst this mixed population of T-cells and macrophages exposed to a virulent -strain of HIV I, i.e. they inhibit spread of HIV infection from T-cell to macrophage.
  • the antibodies were found to prevent infection of the macrophages with HIV, and are therefore neutralising in this in vitro assay, whereas the macrophages became infected in a control culture, as shown in Table 2.
  • Table 2 Neutralisation of virulent strain of HIV in in vitro culture of HIV-infected human T-lymphocytes and uninfected human macrophages. "+++” indicates a high level of infection and "-" indicates effective protection against infection.
  • positive antisera to peptide (a) were evaluated in a syncitium assay. This assay determines the capability of antisera to prevent spread of live HIV from infected to uninfected cells and to prevent fusion between cells mediated through reactivity between the virus glycoprotein (gpl60) and the CD4 molecule. Measurement is carried out by syncitium detection and enumeration.
  • the syncitium assay is performed as follows: a known concentration of an HIV producer (CD+4) cell line supporting active virus replication is washed three times and mixed with the antiserum under test and used at specified dilutions. After incubation for 30 minutes at 37"C these cells are mixed, at specified proportions with an indicator CD4+ cell line, highly susceptible to HIV infection and syncitium induction. The cells are observed daily for syncitium formation.
  • CD+4 HIV producer
  • Antibodies to peptide(a) were found to inhibit syncitium formation as shown in Table 3.
  • Anti-peptide (a) antiserum + (3/5 animals) Normal sheep serum
  • the ELISA procedure determines the degree of reactivity of the synthetic peptides (analogous to regions of either gpl20 or the gp41 transmembrane protein of HIV-l) with antibody to the surface glycoprotein of HIV-l in sera of HIV-l positive individuals.

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Abstract

Les peptides synthétiques décrits comprennent au moins une propriété antigénique de la protéine enveloppe d'au moins une souche du virus d'immuno-deficience humaine (HIV). Une séquence préférée est: X-Asp-Gln-Ser-Leu-Lys-Gly-Ile-Trp-Gly-Cys-Ser-Gly-Lys-Leu-Ala-Cys-Y, où X et Y peuvent, l'un indépendamment de l'autre, être absents ou être un ou plusieurs résidus d'acides aminés additionnels, et les résidus Cys situés aux positions 10 et 16 peuvent être facultativement liés par un pont de disulfure intramoléculaire. Lesdits polypeptides peuvent être utilisés pour le diagnostic, le traitmeent et la prophylaxie de l'infection HIV. On décrit également des anticorps et les fragments de liaison qui se lient spécifiquement aux peptides.
EP91906077A 1990-03-15 1991-03-13 Polypeptides synthetiques Withdrawn EP0519986A1 (fr)

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GB909005829A GB9005829D0 (en) 1990-03-15 1990-03-15 Synthetic polypeptides
GB9005829 1990-03-15

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ZA (1) ZA911886B (fr)

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US6511845B1 (en) 1992-08-07 2003-01-28 Alan R. Davis Methods for producing an immune response against HIV-1
DE69333397T2 (de) 1992-08-27 2004-12-09 Bioclones (Proprietary) Ltd., Sandton Retro-, inverso-, und retro-inverso synthetische peptidanaloge
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CN1472314A (zh) * 2002-07-29 2004-02-04 清华大学 艾滋病病毒o型株的一个免疫学表位及其应用
CN100445296C (zh) * 2006-03-31 2008-12-24 浙江大学 多肽有机化合物及其在异种移植中的应用
WO2010057197A1 (fr) 2008-11-17 2010-05-20 The Regents Of The University Of Michigan Compositions de vaccins contre le cancer et leurs méthodes d’utilisation
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Also Published As

Publication number Publication date
ZA911886B (en) 1991-12-24
IL97551A0 (en) 1992-06-21
AP9100245A0 (en) 1991-04-30
FI923800A0 (fi) 1992-08-24
AU7467991A (en) 1991-10-10
FI923800A (fi) 1992-08-24
AU636735B2 (en) 1993-05-06
NZ237417A (en) 1993-10-26
BR9106159A (pt) 1993-03-16
HU9202939D0 (en) 1992-12-28
WO1991013909A1 (fr) 1991-09-19
JPH05505188A (ja) 1993-08-05
CS68091A2 (en) 1991-12-17
OA09671A (en) 1993-05-15
AP211A (en) 1992-10-21
GB9005829D0 (en) 1990-05-09
MX24890A (es) 1993-12-01
HUT63179A (en) 1993-07-28
CN1054772A (zh) 1991-09-25
CA2078220A1 (fr) 1991-09-16

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