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Kinetoplastid membrane protein 11 (KMP-11) from Leishmania donovani is an abundant 11-kDa surface membrane glycoprotein. Lymph node cells from mice of six different H-2 haplotypes immunized with KMP-11 or with L. donovani promastigotes were stimulated to proliferate in vitro with purified KMP-11. Primed purified T cells required antigen presentation since they were not stimulated unless KMP-11-pulsed or L. donovani-infected macrophages were added. Promastigotes of a wide variety ofLeishmania species and procyclic forms of African trypanosomes stimulated proliferation of KMP-11-primed or L. donovani promastigoteprimed lymph node cells. All of the Leishmania promastigotes and African trypanosomes tested contained an 11-kDa protein, as detected by immunoblotting with KMP-11-specific monoclonal antibodies. The widespread distribution of the 11-kDa (KMP-11) molecules and their ability to stimulate strong T-lymphocyte proliferation in a non-H-restricted fashion suggest that they may be important molecules for induction of cell-mediated immune responses.

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