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. 1993 Jan;61(1):284–288. doi: 10.1128/iai.61.1.284-288.1993

Rosetting Plasmodium falciparum-infected erythrocytes express unique strain-specific antigens on their surface.

H Helmby 1, L Cavelier 1, U Pettersson 1, M Wahlgren 1
PMCID: PMC302716  PMID: 7678099

Abstract

Spontaneous binding of uninfected erythrocytes to Plasmodium falciparum-infected erythrocytes (rosetting) has been suggested to have a critical role in the induction of cerebral malaria. We report here that rosetting can be mediated by several molecular mechanisms involving parasite polypeptides with M(r)s of 22,000 or 28,000, termed rosettins. Antibodies to either polypeptide disrupt rosettes in a strain-specific fashion. Rosettes of five of the seven isolates examined thus far are more easily disrpted by anti-22,000-M(r) rosettin antibodies than by anti-28,000-M(r) rosettin antibodies. Polyclonal anti-22,000-M(r) rosettin antibodies raised in mice or rabbits strongly and strain specifically stain the surface of nonfixed erythrocytes infected with late asexual stages of rosetting P. falciparum. Simultaneous antibody staining and rosetting are seen when the anti-22,000-M(r) rosettin antiserum is diluted so that only partial disruption of rosettes is obtained, confirming that the fluorescence-labelled infected erythrocytes are involved in rosetting. The 22,000-M(r) rosettin is accessible for surface iodination on erythrocytes infected with strains of rosetting parasites sensitive to anti-22,000-M(r) rosettin antibodies, whereas no labelling occurred on either normal erythrocytes or nonrosetting-P. falciparum-infected erythrocytes. Purified anti-22,000-M(r) rosettin serum immunoglobulin G immunoprecipitated three parasite-derived polypeptides with M(r)s of 22,000, 45,000 (doublet), and 50,000 from lysates of [35S]methionine-labelled, parasite-infected erythrocytes. Our results suggest that rosetting is mediated by strain-specific, antigenically distinct, P. falciparum-derived polypeptides.

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Selected References

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