Avaliação Ex vivo e In vitro da diversidade do repertório VB em linfócitos T de pacientes com leishmaniose cutânea localizada

Several recent studies found ine infectious disease literature (in toxoplasmosis, malaria, filariasis and Chagas’ disease, e.g.) have addressed the relationship of diversity in Vp T cell repertoire looking for deletion or hyper responsive clonal activity at different stages of infection or disease progression. Most have found a policlonal activation. We report here the observation of the T cell Vp repertoire in human cutaneous leishmaniasis (CL), using the following approaches: a) the comparasion of compare VP repertoire of peripheral blood mononuclear cells (PBMC) of CL patients to normal volunteers (NV); b) exploration of compartmentalization, by comparing cells from regional lymph nodes draining the lesion area to PBMC in CL patients; c) the evaluation of in vitro stimulation by Leishmania, by comparing lymph node cells before and after culture with Leishmania braziliensis antigen; d) the evaluation in vivo stimulation, by comparing pre- to post-vaccination responses of NV submitted to anti-leishmania vacciantion (BIOBRAS, MG-Br). All evaluations were performed by cytofluorimetric analysis (FACSort- BD) using an extended panel of anti-TCR Vp monoclonal antibodies (Immunotech), as well as anti-CD4 and anti-CD8 monoclonal antibodies (BD). Our results indicate an oligoclonal differential and peptide preferential expansion in CD4 and oligoclonal in CD8 populations.