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Mol Biochem Parasitol. 2009 Jul;166(1):4-14. doi: 10.1016/j.molbiopara.2009.02.003. Epub 2009 Feb 20.

Molecular characterisation of kappa-5, a major antigenic glycoprotein from Schistosoma mansoni eggs.

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1
Research Center Borstel, Borstel, Germany. gschramm@fz-borstel.de

Abstract

The major immunopathological consequences of infection with Schistosoma mansoni, a T helper type 2 response and granuloma formation leading to fibrotic tissue damage, are caused by the egg stage of the parasite. Three antigens of S. mansoni eggs, termed IPSE/alpha-1, omega-1 and kappa-5, have been found to be the primary targets of the egg-directed antibody response of the host. Here, we report on the isolation, cloning and characterisation of kappa-5. Apart from an uncharacterised mRNA sequence in S. japonicum, no significant similarities of kappa-5 to known sequences from other species were found. In contrast to IPSE/alpha-1 and omega-1, which have been found only in eggs, kappa-5 was present in miracidia as well as in eggs at the mRNA and protein levels. In eggs, isoforms of kappa-5 were observed with both three and four fully occupied N-glycosylation sites, while in miracidia only one isoform with four N-glycans could be detected. Interestingly, in Western blots sera from S. mansoni-infected Africans were reactive against kappa-5 with IgE and IgG isotype antibodies, but against IPSE/alpha-1 and omega-1 only with IgG antibodies. The further characterisation of kappa-5 as one of the three major egg antigens should help to better understand the immunology and immunopathology of schistosomiasis.

[Indexed for MEDLINE]

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