B7-H1 blockade increases survival of dysfunctional CD8(+) T cells and confers protection against Leishmania donovani infections.

ABSTRACT: Experimental visceral leishmaniasis (VL) represents an exquisite model to study CD8(+) T cell responses in a context of chronic inflammation and antigen persistence, since it is characterized by chronic infection in the spleen and CD8(+) T cells are required for the development of protective immunity. However, antigen-specific CD8(+) T cell responses in VL have so far not been studied, due to the absence of any defined Leishmania-specific CD8(+) T cell epitopes. In this study, transgenic Leishmania donovani parasites expressing ovalbumin were used to characterize the development, function, and fate of Leishmania-specific CD8(+) T cell responses. Here we show that L. donovani parasites evade CD8(+) T cell responses by limiting their expansion and inducing functional exhaustion and cell deat

SUBMITTER: Joshi T 

PROVIDER: S-EPMC2674929 | biostudies-literature | 2009 May

REPOSITORIES: biostudies-literature