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Glycoinositolphospholipids from Trypanosoma cruzi induce B cell hyper-responsiveness in vivo
A M Bilate1, J O Previato, L Mendonça-Previato
1Instituto de Microbiologia, Prof. Paulo de Góes, CCS, Universidade Federal do Rio de Janeiro, Cidade Universitária, Rio de Janeiro, RJ, Brazil.
Abstract:
The surface of the protozoan Trypanosoma cruzi, the etiologic agent of Chagas' disease, is covered by a dense glycolipid layer, composed mainly by a structurally related family of glycoinositolphospholipids (GIPLs). In the present study we evaluated the in vivo effects of the GIPL on B cell function and immunoglobulin (Ig) secretion. We observed that GIPL injection led to a sustained increase in circulating IgM levels. B cells from GIPL injected mice showed higher response when activated in vitro with either LPS or dextran-conjugated anti-IgD antibodies or purified cytokines. GIPL purified from T. cruzi also showed an adjuvant effect, since this glycophospholipid boosted a polysaccharide-(TNP-Ficoll) induced IgG response. Taken together, our data indicate that T. cruzi-derived GIPL could be at least partially responsible for the remarkable B cell activation observed during T. cruzi acute infection in vivo.