Recombinant Leishmania Major Lipophosphoglycan 3 Activates Human T-Lymphocytes Via Tlr2-Independent Pathway Publisher Pubmed



Hosseini M^{1, 2} ; Fatahaliha MH^{1, 2} ; Aghebatimaleki L² ; Pour AM² ; Rafati S⁴ ; Seifinajmi M² ; Younesi V⁵ ; Jadidiniaragh F⁵ ; Yousefi M²
Source: Journal of Immunotoxicology Published:2016

Abstract

Leishmaniasis is one of the most common infectious diseases transmitted by an obligate intracellular genus Leishmania. As there is no efficient vaccination strategy for leishmaniasis, new immunostimulatory components may enhance protective immune responses against this parasite. Lipophosphoglycan 3 (LPG3) is an essential protein required for LPG assembling. In this study, the ability of recombinant LPG3 (rLPG) and its fragments to activate isolated healthy human T-cells and cytokine secretion was evaluated in vitro. The results showed that rLPG3 and its N-terminal fragment (rNT-LPG3) enhanced expression of CD69 on the surface of T-cells and promoted differentiation of CD4+ T-lymphocytes toward a T-helper 1 (TH1) phenotype, in part, through up-regulation of interferon (IFN)-γ expression in a TLR2-independent manner. These results indicated the protective effects of LPG3 (particularly NT-LPG3 fragment) as a potent immunostimulatory component of leishmania in vaccination against leishmaniasis. Further investigations in in vivo assays are clearly warranted. © 2015 Informa UK Limited trading as Taylor & Francis Group.