CETP Lowers TLR4 Expression Which Attenuates the Inflammatory Response Induced by LPS and Polymicrobial Sepsis

Author(s)

Venancio, Tatiana Martins ; Machado, Roberta Marcondes ; Castoldi, Angela ; Amano, Mariane Tami ; Nunes, Valeria Sutti ; Rocha Quintao, Eder Carlos ; Saraiva Camara, Niels Olsen ; Soriano, Francisco Garcia ; Cazita, Patricia Miralda

• Document type: Journal article
• Source: Mediators of Inflammation; v. 2016, p. 12-pg., 2016-01-01.

Abstract

Sepsis is a systemic inflammatory response to infection eliciting high mortality rate which is a serious health problem. Despite numerous studies seeking for therapeutic alternatives, the mechanisms involved in this disease remain elusive. In this study we evaluated the influence of cholesteryl ester transfer protein (CETP), a glycoprotein that promotes the transfer of lipids between lipoproteins, on the inflammatory response in mice. Human CETP transgenic mice were compared to control mice (wild type, WT) after polymicrobial sepsis induced by cecal ligation and puncture (CLP), aiming at investigating their survival rate and inflammatory profiles. Macrophages from the peritoneal cavity were stimulated with LPS in the presence or absence of recombinant CETP for phenotypic and functional studies. In comparison to WT mice, CETP mice showed higher survival rate, lower IL-6 plasma concentration, and decreased liver toll-like receptor 4 (TLR4) and acyloxyacyl hydrolase (AOAH) protein. Moreover, macrophages from WT mice to which recombinant human CETP was added decreased LPS uptake, TLR4 expression, NF-kappa B activation and IL-6 secretion. This raises the possibility for new therapeutic tools in sepsis while suggesting that lowering CETP by pharmacological inhibitors should be inconvenient in the context of sepsis and infectious diseases. (AU)

• FAPESP's process: 12/22422-1 - Analysis of participation of cholesteryl ester transfer protein (CETP) in inflammatory response triggered by LPS and mediated by Toll-like receptor 4 (TLR4) in macrophages
• Grantee: Patricia Miralda Cazita
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/04302-6 - The role of Cholesteryl Ester Transfer Protein (CETP) in the inflammatory response triggered by LPS and mediated by Toll-Like receptor 4 (TLR4) in macrophages
• Grantee: Tatiana Martins Venancio
• Support Opportunities: Scholarships in Brazil - Master