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* Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Cientificas, Madrid, Spain; and
Department of Biochemistry, University of Kentucky Medical Center, Lexington, KY 40536
Infection of dendritic cells by the human protozoal parasite Leishmania is part of its survival strategy. The dendritic cell receptors for Leishmania have not been established and might differ in their interactions among Leishmania species and infective stages. We present evidence that the surface C-type lectin DC-SIGN (CD 209) is a receptor for promastigote and amastigote infective stages from both visceral (Leishmania infantum) and New World cutaneous (Leishmania pifanoi) Leishmania species, but not for Leishmania major metacyclic promastigotes, an Old World species causing cutaneous leishmaniasis. Leishmania binding to DC-SIGN was found to be independent of lipophosphoglycan, the major glycoconjugate of the promastigote plasma membrane. Our findings emphasize the relevance of DC-SIGN in Leishmania-dendritic cell interactions, an essential link between innate and Leishmania-specific adaptive immune responses, and suggest that DC-SIGN might be a therapeutic target for both visceral and cutaneous leishmaniasis
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