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WO1988000595A1 - Antigene de plasmodium falciparum apparaissant a la surface de merozoites - Google Patents

Antigene de plasmodium falciparum apparaissant a la surface de merozoites Download PDF

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Publication number
WO1988000595A1
WO1988000595A1 PCT/AU1987/000227 AU8700227W WO8800595A1 WO 1988000595 A1 WO1988000595 A1 WO 1988000595A1 AU 8700227 W AU8700227 W AU 8700227W WO 8800595 A1 WO8800595 A1 WO 8800595A1
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Prior art keywords
antigen
sequence
ser
antibody
asn
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PCT/AU1987/000227
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English (en)
Inventor
Ronald Jof Epping
Ranjan Ramasamy
Jason Arthur Smythe
Robin Fredric Anders
Ross Leon Coppel
Hendrik Mario Geysen
Allan James Saul
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Saramane Pty Ltd
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Saramane Pty Ltd
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Priority to GB8806390A priority Critical patent/GB2200641B/en
Priority to DE3751933T priority patent/DE3751933T2/de
Priority to EP87904811A priority patent/EP0276262B1/fr
Priority claimed from AU76998/87A external-priority patent/AU595056B2/en
Publication of WO1988000595A1 publication Critical patent/WO1988000595A1/fr
Priority to KR1019880700297A priority patent/KR880701732A/ko
Priority to DK146388A priority patent/DK146388A/da
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • C07K16/20—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans from protozoa
    • C07K16/205—Plasmodium
    • 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
    • C07K14/44—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from protozoa
    • C07K14/445—Plasmodium
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Definitions

  • This invention relates to the identification of antigens of the asexual blood stages of Plasmodium falciparum, which are capable of generating antibodies which are able to inhibit the growth of the parasite, and to the use of these antigens and antibodies in immunization, diagnostic and treatment methods.
  • Merozoite surface antigens are of particular interest in the study of malarial immunology and the mechanism of host protection to parasites due to their accessibility to host immune mechanisms and because of their likely involvement in the erythrocytic invasion process. Immunit against erythrocytic stages of Plasmodium infections has been demonstrated by simian vaccination studies using merozoite preparations of P.knowlesi (1) and P.falciparum (2,3). Antigens identified by
  • PMMSA Plasmodium falciparum strain
  • Plasmodium falciparum parasite which can be used to generate antibodies able to inhibit the growth of said parasite comprises:
  • a merozoite surface antigen of the asexual blood stages of Plasmodium falciparum which is characterised by: (i) having an apparent molecular weight in the range of approximately 41 kDa to 53 kDa;
  • the antigen is antigen QF122 (also called GYMSSA) described in detail herein, or an antigenic fragment thereof. More preferably, the antigen is a polypeptide having the amino acid sequence set out in Figure 6, or an antigenic fragment thereof.
  • the size of the antigen of the present invention on a series of polyacrylamide gels has been ascertained using monoclonal antibodies 8G10/48,
  • the present invention provides an antigen of Plasmodium falciparum , which is characterised by inclusion in the amino acid sequence thereof of the sequence Ser-Thr-Asn-Ser (STNS) or the sequence Ser-Asn-Thr-Asn-Ser-Val (SNTNSV)
  • the present invention also extends to a hybrid cell line which produces an antibody which is specific for an antigen of the present invention, as well as to an antibody produced by such a hybrid cell line.
  • the antibody is the monoclonal antibody 8G10/48, 9E3/48 or 8F6/49 described in detail herein.
  • Monoclonal antibody 8G10/48 is produced by the hybrid cell line deposited at the European Collection of Animal Cell Cultures, Porton Down, Salisbury, England, on July 10, 1987 under No. 87071010.
  • the present invention also relates to an antigen of Plasmodium falciparum, which is recognised by the monoclonal antibody 8G10/48, 9E3/48 or 8F6/49.
  • Monoclonal antibodies of the present invention are characterised in that they either prevent release of merozoites into the blood stream of an infected individual, or prevent these merozoites from invading the red blood cells of such an individual.
  • the invention also provides a method for passively immunising a host against Plasmodium falciparum which method comprises administering to the host antibodies in accordance with the present invention.
  • the invention also provides a method for actively immunising a host against Plasmodium falciparum which method comprises administering to the host an antigen according to the present invention, or an antigenic fragment thereof.
  • the invention provides a vaccine comprising an antigen of the present invention, or an antigenic fragment thereof, a pharmaceutically acceptable carrier or diluent, an optionally an adjuvant.
  • the invention also provides a passive vaccine comprising an antibody of the present invention, and a pharmaceutically acceptable carrier or diluent.
  • the invention also provides a reagent for purification of Plasmodium falciparum antigens comprising an antibody according to the invention.
  • the invention provides a diagnostic reagent for detection of Plasmodium falciparum or antigens derived therefrom, comprising an antibody according to the invention.
  • Monoclonal antibodies were purified by affinity chromatography on Protein A Sepharose (Pharmacia) and were tested for inhibition of invasion using a similar method to that described in Schofield (19) . Briefly, purified monoclonal antibodies in 1640 medium were added to synchronised parasites at ring stage and incubation of the parasites continued to allow reinvasion. [ 35S]
  • Parasite line FCQ-27/PNG was grown in 5 culture by a modification (21) of the method of
  • the parasites were grown in synchronous culture using multiple sorbitol treatments as described (23) .
  • Antibodies 10 Murine hybridomas were produced by the method of Galfre et.al. (24) as described (25).
  • FCQ-27/PNG FCQ-27/PNG. These cells were purified from culture by the method of Saul et.al. (41). The cells were injected intraperitoneally with 0.1 ml Freund's complete adjuvant. The mice were boosted 4 weeks later by an intravenous injection of 5 x 10
  • Monoclonal antibody 8F6/49 is an IgG_ antibody. Antibodies were labelled with 125I usi.ng the Iodogen procedure of Fraker and Speck (26).
  • thin smears were made from schizont stage parasites isolated by gelatine sedimentation and the cells fixed in acetone: •methanol 9:1 at -20°C for 30min.
  • the parasites were reacted with Mab 8F6/49 (supernatants of hybridoma cultures used undiluted) at 4°C for 16h, 0 washed in 0.01M phosphate buffered saline, pH 7.2 (PBS), and then treated with fluorescein conjugated goat antibodies to mouse immunoglobulins for 3h at 37°C.
  • the washed cells were then viewed under U.V. illumination in an Olympus microscope with 5 appropriate filters.
  • Parasitized erythrocytes were harvested from synchronous cultures in the presence of leupeptin and antipain (10 ⁇ g ml ) to reduce invasion of Q erythrocytes and promote the accumulation of meorzoites clustered around haemazoin pigment granules (27) .
  • Parasitised cells were incubated for 30min at 20°C with monoclonal antibody (50 ⁇ g ml -1 ) in lOOmM Na 2 HP0 4 (pH7.4) with 5 intermittent agitation.
  • Antibodies recognising intra-parasite antigens were used as controls. The cells were washed three times in phosphate buffer and incubated for.
  • Protein A affinity-purified antibody was added to highly-synchronised cultures of FCQ-27/PNG in 96-well plates.
  • the wells contained 45 ⁇ l culture medium, 10% (v/v) pooled human plasma (0.01-1.0 mg ml " ) with a 5% haematocrit and 1-2% schizont parasitemia and 5 ⁇ l of test antibody.
  • the culture medium contained ll.lmM glucose, 40.3mM TES, 27.6mM NaHCO and RPMI 1640. (Gibco Labs, Life Technologies Inc., Grand Island, N.Y., U.S.A.). Control wells were identical in all respects except that they contained either protein A affinity-purified normal mouse IgG or medium alone. Experiments were performed in quadruplicate.
  • the parasites were allowed to develop for 40h to the mature schizont stage and harvested by pipetting the well contents onto Whatman glass fibre discs which then were washed in trichloroacetic acid and ethanol. The dry discs were immersed in 3ml toluene scintillant and counted in a Packard scintillation counter.
  • protease inhibitors 5-10 ⁇ g ml chymostatin, antipain, leupeptin, N-tosyl-L- phenylalanine chloromethyl ketone (TPCK) and 34 ⁇ g ml- phenylmethylsulfonyl fluoride (PMSF) .
  • Detergent-soluble extracts were boiled in Laemmli sample buffer (28) containing 5% (v/v) ⁇ - mercaptoethanol and aliquots were separated onto a discontinuous SDS-slab polyacrylamide gel (3% stacking gel, 7.5% separating gel) with concentrations ranging from 7.5% to 15% acrylamide in particular experiments.
  • the gels were Western blotted onto nitrocellulose (29) .
  • Reactive antigens were detected by the binding of murine monoclonal antibody from hybridoma supernatants (1-10 ⁇ g ml -1) and [125I] goat anti-mouse antibody (0.25 ⁇ g ml , 1.3 ⁇ Ci ml ) followed by
  • A-Sepharose beads The beads were washed, extracted in Laemmli sample buffer (28) and analysed by SDS-PAGE followed by fluorography.
  • Indirect immunofluor-escence staining pattern produced on acetone-fixed films of Plasmodium falciparum schizonts with monoclonal antibody 8G10/48. Surface fluorescence is localised to the merozoite membrane within the mature schizont. The same fluorescence pattern is observed using monoclonal antibody 9E3/48.
  • Immunoelectromicrograph of merozoites incubated with monoclonal antibody 8G10/48 and colloidal gold:goat anti-mouse Ig. Aggregates of gold particles (15nm diameter) are distributed over the entire surface of the merozoite. Bar 0.5 ⁇ .
  • Determinants present on the merozoite surface during schizogony were recognised by 5 monoclonal antibodies 8G10/48, 9E3/48 and 8F6/49.
  • a characteristic multi-spherical fluorescence pattern was observed using immunofluorescence in cultures collected prior to rupture of the mature schizont (Fig.l).
  • Antibody-specific fluorescence was observed 0 during all erythrocytic parasite stages but becomes localised to the membrane surrounding merozoites in mature schizonts.
  • Examination of thin films of several laboratory strains of P.falciparum using immunofluorescence and monoclonal antibodies 8G10/48 5 and 9E3/48 revealed similar surface fluorescence in all of 4 isolates tested (Table 1).
  • Mab 8F6/49 gave a bright fluorescence staining of schizont stage parasites, producing a grape like pattern characteristic of reaction with antigens associated with the merozoite surface.
  • the membranes of newly released merozoites present in the preparation were also stained. Similar staining was observed on the Kl isolate of P.falciparum from Thailand. In contrast, no reaction was observed with the FCR (Gambia) strain.
  • Improved resolution of antibody recognition sites on the merozoite surface was achieved by immunoelectron microscopy of extracellular merozoites utilizing colloidal gold. Dense gold labelling was evident on the merozoite surface membranes, indictive of the relative abundance of this antigen (Fig.2).
  • Monoclonal antibodies 8G10/48 and 9E3/48 inhibit the growth of Plasmodium falciparum as measured by the uptake of [ 35S] rnethionine and
  • FC27 P.falciparum isolate FCQ27/PNG (FC27) used in these studies has been described elsewhere (42) .
  • Triton X-114 solubilization and separation of hydrophobic, hydrophilic and insoluble fractions was performed essentially as described by Bordier (43) with the following modifications.
  • Triton X-114 (purchased from Flulka Ag. , Switzerland) was precondensed in human tonicity phosphate buffered saline (HTPBS) .
  • HTPBS human tonicity phosphate buffered saline
  • a 1ml aliquot of prepacked parasitized cells was solubilized in 15ml of 0.5% Triton X-114 for 90min on ice, with mild vortexing at lOmin intervals.
  • a 1ml sample of the total material was removed and snap frozen. The remaining 15ml were then centrifuged at 10,000xg for 15min at 4°C to remove insoluble material.
  • the detergent-depleted upper layer from the sucrose cushion separation was further depleted of hydrophobic proteins by adding 1ml of 11.4% Triton X-114 on ice, vortexing into solution, warming to 37°C for 5min, then centrifuging and discarding the Triton X-114 pellet. This cycle was repeated three times. The remaining detergent-depleted aqueous solution (aqueous phase) was then snap frozen. All samples were stored at -70°C until analysis. Electrophoresis and imr ⁇ unoblotting.
  • Samples for sodium dodecyl sulphate polyacrylamide gel electrophoresis were processed under reducing conditions and electrophoresced on 10% slab gels. Gels to be analysed for protein were stained with Coomassie brilliant blue. Samples to be analysed by immunoblotting were fractionated on 10% slab gels and electrophoretically transferred to nitrocellulose sheets. After transfer the nitrocellulose was blocked with 5% (W/V) skim milk powder in HTPBS (Blotto) and probed with sera or affinity purified human antibodies diluted appropriately in Blotto.
  • Protein A (Pharmacia Fine Chemicals, Uppsala, Sweden) was iodinated by the chloramine T method to a specific activity of 40 ⁇ Ci/ ⁇ g ⁇ .
  • Antibodies were affinity purified from human serum or plasma on Triton X-114 soluble antigens electrophoretically transferred to nitrocellulose as described previously (44) and modified in this instance as follows. Reduced samples of Triton X-114 extracted membrane antigens were electrophoretically separated and transferred to nitrocellulose. Radioactive 14C high molecular weight markers
  • the affinity-purified antibodies were diluted 1:2 in Blotto to probe immunoblots and ⁇ Amp3 cDNA library filters, or concentrated using a Centricon microconcentrator (Amicon) for immunofluorescence assays.
  • Antibodies were also eluted directly from immunopositive ⁇ Am ⁇ 3 clones grown as lawns on nitrocellulose. Filters with lysed lawns were pre-eluted with borate and glycine buffers, incubated with serea, and the monospecific antibodies eluted as above.
  • This second method of affinity purification required the removal of anti E.coli antibodies which was achieved with sonicates and lawns of control ⁇ Amp3 clones.
  • FCQ27/PNG isolate cDNA librajry Details of the FCQ27/PNG isolate cDNA librajry, its amplification ⁇ n ⁇ Amp3 and lysogenic expression E.coli have been described (33) .
  • Samples were electrophoresced on 10% SDS-PAGE slab gels and either stained for protein or immunoblotted and analysed with affinity purified antibodies, to detect the presence or absence of stable fusion polypeptides with ⁇ -galactosidase. Antibody depletion.
  • ⁇ Amp3 phage were isolated from immunopositive clones and the cDNA insert extracted by EcoRI digestion as described. The purified insert was subcloned into M13 vectors for single stranded sequence determined by the dideoxy method of Sanger (36,46) and into pBTA224 (a modification of PUR-290) kindly provided by Gary Coburn (Biotechnology Australia Pty.Ltd.).
  • the plasmid vector ⁇ BTA224 is an expressing vector in E.coli cells, and clones were rescreened for immunoreactivity by colony immunoassay. Indirect immunofluorescence.
  • Thin blood films of parasitized erythrocytes from asynchronous cultures of P.falciparum were air dried and fixed in 100% acetone at -20°C for 20 minutes. Slides were incubated with concentrated affinity-purified monospecific human antibodies, with fluorescein-conjugated sheep antihuman Ig antiserum as second antibody. Parasite nuclei were counterstained with ethidium bromide.
  • Lanes are, (A), total unfractionated material, (B) , aqueous phase, (C) , Triton X-114 phase, (D) , insoluble material.
  • Immunofluorescence location affinity purified human antibodies to Ag513 used in indirect immunofluorescence assays on asynchronous blood films: schizont (A) and matured merozoite (B) .
  • Selected colonies correspond to Triton X-114 soluble antigens.
  • Antibodies affinity purified on lawns of selected clones were used in colony immunoassays on the array of ten clones and to probe immunoblots of parasite antigens. Three of the clones were found to be siblings encoding the Mr 45,000 antigen from the Triton X-114 phase. The most immunoreactive was chosen as the type clone and designated Ag513.
  • Triton X-114 extracted, fractionated by SDS-PAGE and immunoblots probed with PNG sera.
  • the antigen corresponding to Ag513 was present in all stages of the parasite life cycle, the abundance of the antigen ranging from at least abundant in the asexual ring stage to most abundant in late schizont preparations. In all stages it is totally Triton X-114 soluble.
  • Triton X-114 extracts were prepared from five strains of P.falciparum giving asychronously in culture. The antigen was present in all strains and there were no apparent strain-related differences in the size or immunoreactivity of the antigen. Nucleotide and amino acid sequence of Ao513.
  • the nucleotide sequence of Ag513 together with the predicted amino acid sequence is Fig.6. It contains only one long open reading frame, commencing at base 94 and continuing to base 886. The entire 0 fragment was 1145 bases in length.
  • the AT content of the 5' sequence preceding base 94 is greater than 92%, whereas the AT content of the predicted coding region is approximately 65%. Increased AT content in non-coding regions has been previously documented for 5 several other P.falciparum antigens, suggesting that the rnethionine indicated is the actual initiation codon.
  • the 5* end of the coding ' sequence contains a stretch of 15 uncharged and* hydrophobic amino acids corresponding at residue 6, is most likely the core 0 of a signal which sequence.
  • the sequence encodes two identical copies of a 32 amino acid unit arranged in tandem, beginning at base 271 and continuing to base 462.
  • the stop codon at position 886 is preceded by a stretch of 17 hydrophobic amino acids before the 5 sequence again resumes at AT content in excess of
  • Ag513 corresponds to a putative merozoite surface antigen.
  • 5 Affinity purified human antibodies to Ag513 were prepared as described, concentrated, and used in indirect immunofluorescence assays on asynchronous blood films. The fluorescence pattern observed was consistent with localisation of the antigen on the parasite membrane in trophozoites. In later stages of parasite development, i.e. the schizont and mature merozoite, the fluorescent pattern was consistent with localisation of Ag513 to the 0 merozoite surface (Fig.7).
  • the antigen encoded by Ag513 corresponds to OF122.
  • This Example shows the temperature dependent 5 Triton X-114 detergent separation of integral membrane protein antigens of P.f lciparum.
  • One of the antigens that partitioned to the Triton X-114 phase was identified as CRA, a well characterised antigen of known primary structure which is typical of an integral membrane protein.
  • the other dominant antigens that partition into the Triton X-114 clustered into the Mr 40-55,000 range and apparently did not correspond to antigens that had been previously cloned.
  • These proteins, after transfer to nitrocellulose were used to affinity purify polyclonal monospecific human antibodies which were used to isolate a clone designated Ag513, corresponding to a membrane protein, from a ⁇ Amp3 cDNA expression library.
  • Antibodies to Ag513 reacted with a Triton X-114 soluble protein of Mr 45,000 which was present in all stains of P.falciparum examined and present in all of the asexual life cycle stages. Indirect immunofluorescent microscopy with these antibodies gave strong staining on mature stages with a grape-like pattern on segmented schizonts, a pattern characteristic of antibodies to merozoite surface antigens.
  • the primary structure of the Ag513 related antigen has been deduced from the nucleotide sequence of the full length cDNA sequence.
  • This Example describes a further sequence coded for by P.falciparum which is recognised by monoclonal antibodies 8G10/48 and 9E3/48.
  • a clone was obtained from a cDNA expression 0 library constructed in ⁇ gtll Amp3 (32) using the
  • FCQ-27/PNG strain of Plasmodium falciparum, (33) FCQ-27/PNG strain of Plasmodium falciparum, (33) .
  • Monoclonal antibodies selected for screening the cDNA library were those which produced strong signals in an immunoradiometric assay (30) .
  • This selection bias 5 increased the likelihood of identifying positive recombinants in the colony assay described below.
  • Recombinant cultures were plated onto 82cm nitrocellulose filters at a plating density of 3-4 x 10 3 cells per filter and grown on Lu ⁇ a-Bertani 0 agar plates for 8h at 32°C. Colonies were replicated and grown for a further 2h at 32°C. The colonies were heat-induced at 42°C for Ih and lysed by placing the filters in 50mM Tris/HCl (pH 7.5) containing
  • Standard techniques were used to purify DNA from antibody-positive clones, digest the nucleic acids with EcoRI restriction endonuclease and recover the cDNA insert following agarose gel electrophoresis of the digest fragments. EcoRI fragments were cloned into M13 mpl8 and mpl9 (35) and the nucleic acid sequence determined by the dideoxy chain-termination procedure (36) . Octapeptide synthesis and epitope determination.
  • 8G10/48 and 9E3/48 were used to screen, an expression library constructed in ⁇ gtll Am ⁇ 3 to select for recombinants expressing cDNA fragments of Plasmodium falciparum.
  • One clone (designated CL2122) was recognised by both antibodies.
  • the EcoRI restriction fragment is 855 nucleotides in length followed by a region of poly (A) nucleotides (Fig.9). Nucleotide repeats which are characteristic of other Plasmodium falciparum genes are absent from this clone. The sequence apparently is not expressed as a fusion polypeptide coupled to the 3-galactosidase gene product (data not shown) .
  • Initiation signals characteristic of internal sites for RNA synthesis (38a) are present from bases 592 to 627 and a plausible polypeptide encoded by this sequence is presented (Fig.9).
  • a change in codon usage from that of typical non-coding DNA sequences to coding sequences characteristic of translated regions of malarial genes (40) in the vicinity of base 650 supports this interpretation.
  • octapeptides corresponding to the derived amino acid sequence shown in Fig.9 were synthesised and examined for reactivity with hybridoma supernatants of monoclonal antibodies 8G10/48 and 9E3/48.
  • Five octapeptides spanning the sequence Lys Asn Asn Asn Ser Thr Asn Ser Gly lie Asn Asn produced strong positive ELISA signals using both antibodies at supernatant dilutions to 1/10,000 (Fig.10).
  • Negative results were obtained using 9 other monoclonal antibodies at 1/100 dilution of hybridoma supernatant (Fig.10).
  • the epitope recognised by the monoclonal antibodies is the sequence common to these five octapeptides, namely STNS. Replacement net analysis of the epitope.
  • T is substituted by I, S or V;
  • N is substituted by C,D,E,F,G,H,L or S;
  • the second S is substituted by C,D,H or T.
  • the antigens described in Examples 1 and 2 above are the same antigen, having the same Western blotting patterns, immunoprecipitation and labelling characteristics and identical immunofluorescence patterns. Furthermore, it has been shown that monoclonal antibodies which define QF122 described in Example 1 bind to sequences which are coded for by the insert in Ag513 described in Example 2. The immunofluorescence patterns are consistent with a merozoite surface location and the immunoelectron microscopy has localised an antigen on the surface of merozoites.
  • mice that were used for the production of these monoclonal antibodies were immunised with whole parasitized red cells, it cannot be determined whether it was QF122 or some other protein containing the sequence STNS (for example, the putative sequence coded for by CL2122 in Example 3), or even some related sequence, which elicited this protective response.
  • Efstratiadis A., Posakony, J.W., Maniatis, T., Lawn, R.M., O'Connel, C, Spritz, R.A., DeRiel, J.C, Forget, B.G., Weissman, S.M. , Slighton, J.L., Blechl, A.E., Smithies, 0., Baralle, F.E., Shoulders, C.C., and Proudfoot, N.J. (1980), Cell 21. 653-668.

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Abstract

Antigène des étapes sanguines asexuées de Plasmodium falciparum apparaissant à la surface de mérozoïtes: (i) se caractérisant par un poids moléculaire apparent se situant approximativement entre 41 kDa et 53 kDa; (ii) se composant d'une glycoprotéine incorporant de l'acide myristique; (iii) se présentant initialement par localisation cytoplasmique diffuse et dans des schizontes mûrs situés sur la membrane superficielle de mérozoïtes; et (iv) se reconnaissant par des anticorps monoclonaux contre les étapes sanguines asexuées de P.falciparum qui inhibent la croissance de parasites in vitro; ou fragment antigénique dudit antigène. Des anticorps monoclonaux spécifiques audit antigène et des lignées cellulaires hybrides produisant lesdits anticorps sont également décrits.
PCT/AU1987/000227 1986-07-17 1987-07-17 Antigene de plasmodium falciparum apparaissant a la surface de merozoites Ceased WO1988000595A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB8806390A GB2200641B (en) 1986-07-17 1987-07-17 Merozoite surface antigen of plasmodium falciparum
DE3751933T DE3751933T2 (de) 1986-07-17 1987-07-17 Merozoit-oberflächen-plasmodium-falciparum-antigen
EP87904811A EP0276262B1 (fr) 1986-07-17 1987-07-17 Antigene de plasmodium falciparum apparaissant a la surface de merozoites
KR1019880700297A KR880701732A (ko) 1986-07-17 1988-03-17 플라스모듐 팔시파룸(Plasmodium falciparum)의 분열체 표면 항원
DK146388A DK146388A (da) 1986-07-17 1988-03-17 Plasmodium falciparum merozoit-overfladeantigen

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
AUPH6977 1986-07-17
AUPH697786 1986-07-17
AUPI104887 1987-03-24
AUPI1047 1987-03-24
AUPI1048 1987-03-24
AUPI104787 1987-03-24
AU76998/87A AU595056B2 (en) 1986-07-17 1987-07-17 Merozoite surface antigen of plasmodium falciparum

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990001496A1 (fr) * 1988-08-12 1990-02-22 3I Research Exploitation Limited Polypetides et adn les encodant
US5231168A (en) * 1988-09-16 1993-07-27 Statens Seruminstitut Malaria antigen
FR2697022A1 (fr) * 1992-10-19 1994-04-22 Pasteur Institut Antigènes de Plasmodium falciparum capables d'induire des anticorps protecteurs à large spectre - Application à la vaccination.
DE19640817A1 (de) * 1996-10-02 1998-05-14 Hermann Prof Dr Bujard Rekombinantes Herstellungsverfahren für ein vollständiges Malaria-Antigen gp190/MSP 1
US7071296B2 (en) 1992-10-19 2006-07-04 Institut Pasteur Plasmodium falciparum antigens inducing protective antibodies

Citations (2)

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US5811106A (en) * 1988-08-12 1998-09-22 3I Research Exploitation Limited Plasmodium falciparum thrombospondin-related anonymous proteins (TRAP), fragments and functional derivatives
WO1990001496A1 (fr) * 1988-08-12 1990-02-22 3I Research Exploitation Limited Polypetides et adn les encodant
US5231168A (en) * 1988-09-16 1993-07-27 Statens Seruminstitut Malaria antigen
US6017538A (en) * 1992-10-19 2000-01-25 Institut Pasteur Plasmodium falciparum antigens inducing protective antibodies
WO1994009140A1 (fr) * 1992-10-19 1994-04-28 Institut Pasteur Antigenes de plasmodium falciparum inducteurs d'anticorps protecteurs
FR2697022A1 (fr) * 1992-10-19 1994-04-22 Pasteur Institut Antigènes de Plasmodium falciparum capables d'induire des anticorps protecteurs à large spectre - Application à la vaccination.
US6472519B1 (en) 1992-10-19 2002-10-29 Institut Pasteur Plasmodium falciparum antigens inducing protective antibodies
US6949627B2 (en) 1992-10-19 2005-09-27 Institut Pasteur Plasmodium falciparum antigens inducing protective antibodies
US7071296B2 (en) 1992-10-19 2006-07-04 Institut Pasteur Plasmodium falciparum antigens inducing protective antibodies
US7211256B2 (en) 1992-10-19 2007-05-01 Institut Pasteur Plasmodium falciparum antigens inducing protective antibodies
US7563440B2 (en) 1992-10-19 2009-07-21 Institut Pasteur Plasmodium falciparum antigens inducing protective antibodies
EP1471150A3 (fr) * 1992-10-19 2009-10-21 Institut Pasteur Antigènes de plasmodium falciparum inducteurs d'anticorps protecteurs
DE19640817A1 (de) * 1996-10-02 1998-05-14 Hermann Prof Dr Bujard Rekombinantes Herstellungsverfahren für ein vollständiges Malaria-Antigen gp190/MSP 1

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