Journal
JOURNAL OF IMMUNOLOGY
Volume 188, Issue 4, Pages 1942-1952Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1102053
Keywords
-
Categories
Funding
- Conselho Nacional de Pesquisas [476737/2004-4, 141757/2006-0]
- Comissao de Aperfeicoamento de Pessoal de Nival Superior [PDEE4261/06-2]
Ask authors/readers for more resources
The innate immune system is the first mechanism of vertebrate defense against pathogen infection. In this study, we present evidence for a novel immune evasion mechanism of Trypanosoma cruzi, mediated by host cell plasma membrane-derived vesicles. We found that T. cruzi metacyclic trypomastigotes induced microvesicle release from blood cells early in infection. Upon their release, microvesicles formed a complex on the T. cruzi surface with the complement C3 convertase, leading to its stabilization and inhibition, and ultimately resulting in increased parasite survival. Furthermore, we found that TGF-beta-bearing microvesicles released from monocytes and lymphocytes promoted rapid cell invasion by T. cruzi, which also contributed to parasites escaping the complement attack. In addition, in vivo infection with T. cruzi showed a rapid increase of microvesicle levels in mouse plasma, and infection with exogenous microvesicles resulted in increased T. cruzi parasitemia. Altogether, these data support a role for microvesicles contributing to T. cruzi evasion of innate immunity. The Journal of Immunology, 2012, 188: 1942-1952.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available