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In Vitro Differentiation of Human Dendritic Cells and their Markers in Leishmania Infection.

Leishmaniasis comprises a collection of clinical manifestations associated with the infection of obligate intracellular protozoans, Leishmania. The life cycle of Leishmania parasites consists of two alternating life stages (amastigotes and promastigotes), during which parasites reside within either arthropod vectors or vertebrate hosts, respectively. Notably, the complex interactions between Leishmania parasites and several cells of the immune system largely influence the outcome of infection. Importantly, although macrophages are known to be the main host niche for Leishmania replication, parasites are also phagocytosed by other innate immune cells, such as neutrophils and dendritic cells (DCs). DCs play a major role in bridging the innate and adaptive branches of immunity and thus orchestrate immune responses against a wide range of pathogens. The mechanisms by which Leishmania and DCs interact remain unclear and involve aspects of pathogen capture, the dynamics of DC maturation and activation, DC migration to draining lymph node (dLNs), and antigen presentation to T cells. Although a large body of studies support the notion that DCs play a dual role in modulating immune responses against Leishmania, the participation of these cells in susceptibility or resistance to Leishmania remains poorly understood. After infection, DCs undergo a maturation process associated with the upregulation of surface major histocompatibility complex (MHC) II, in addition to costimulatory molecules (namely, CD40, CD80, and CD86). Understanding the role of DCs in infection outcome is crucial to developing therapeutic and prophylactic strategies to modulate the immune response against Leishmania. This paper describes a method for the characterization of Leishmania-DC interaction. This detailed protocol provides guidance throughout the steps of DC differentiation, the characterization of cell surface molecules, and infection protocols, allowing scientists to investigate DC response to Leishmania infection and gain insight into the roles played by these cells in the course of infection.