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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The role of TLR2 in the acute inflammatory response induced by Bothrops atrox snake venom

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Moreira, Vanessa ; Teixeira, Catarina ; da Silva, Henrique Borges ; D'Imperio Lima, Maria Regina ; Dos-Santos, Maria Cristina
Total Authors: 5
Document type: Journal article
Source: Toxicon; v. 118, p. 121-128, AUG 2016.
Web of Science Citations: 5

Envenomation by snakes of the species Bothrops atrox induces local and systemic effects. Local effects include drastic tissue damage and a marked inflammatory response as a result of the synthesis and release of a variety of protein and lipid mediators. Toll-like receptor (TLR) signaling pathways can play an important role in this response, leading to synthesis of these inflammatory mediators. This study investigated the influence of TLR2 on the acute inflammatory response induced by Bothrops atrox venom. Wild-type C57BL/6 mice (WT) and TLR2 gene knockout mice (TLR2(-/-)) were injected with Bothrops atrox venom (BaV), and the following responses to the venom were assessed in peritoneal exudate: leukocyte accumulation; release of mediators, including CCL-2, IL-10, IL-1 beta, IL-6 and LTB4; protein expression of COX-1 and COX-2; and quantification of their products PGE(2) and TXA(2). After injection with BaV, the TLR2(-/-) mice (TLR2(Bav)(-/-)) had higher levels of IL-6 and CCL-2 than WT animals kept under the same conditions (WTBav), together with an accumulation of polymorphonuclear leukocytes (PMNs), inhibition of IL-1 beta and LTB4 and reduced mononuclear leukocyte influx. However, no significant differences in COX 2 protein expression or PGE(2), TXA(2) and IL-10 production between the TLR2(Bav)(-/-) and WTBav animals were observed. Together, these results indicate that the signaling pathway activated by TLR2 acts by modulating the induced inflammatory response to BaV through the direct action of venom-associated molecular patterns (VAMPs) or indirectly by forming damage-associated molecular patterns (DAMPs) and that this may have important therapeutic implications. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 11/21341-5 - Studies on the mechanisms involved in lipid body formation induced by a snake venom phospholipase A2 in isolated macrophages: participation of lipid homeosthasis factors
Grantee:Catarina de Fatima Pereira Teixeira
Support Opportunities: Regular Research Grants
FAPESP's process: 14/00810-5 - IFN-gamma-induced priming during chronic experimental malaria: study of the molecular and effector mechanisms involved
Grantee:Henrique Borges da Silva
Support Opportunities: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07140-2 - Role of inflammasomas in the pathogenesis of tuberculosis caused by hypervirulent clinical isolates of mycobacteria
Grantee:Maria Regina D'Império Lima
Support Opportunities: Regular Research Grants