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Oxidative Medicine and Cellular Longevity
Volume 2017 (2017), Article ID 8326749, 11 pages
https://doi.org/10.1155/2017/8326749
Research Article

PPAR-γ Activation Prevents Septic Cardiac Dysfunction via Inhibition of Apoptosis and Necroptosis

Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China

Correspondence should be addressed to Feng Xiao

Received 1 June 2017; Accepted 10 July 2017; Published 3 August 2017

Academic Editor: Hong Zheng

Copyright © 2017 Shiyan Peng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Sepsis-induced cardiac dysfunction remains one of the major causes of death in intensive care units. Overwhelmed inflammatory response and unrestrained cell death play critical roles in sepsis-induced cardiac dysfunction. Peroxisome proliferator-activated receptor- (PPAR-) γ has been proven to be cardioprotective in sepsis. However, the mechanism of PPAR-γ-mediated cardioprotection and its relationship with inflammation and cell death are unclear. We hypothesized that activation of PPAR-γ by reducing cardiac inflammation, myocardial apoptosis, and necroptosis may prevent myocardial dysfunction in sepsis. Rats were subjected to cecal ligation and puncture (CLP) with or without PPAR-γ agonist (rosiglitazone) or antagonist T0070907 (T007). After CLP, cardiac function was significantly depressed, which was associated with the destructed myocardium, upregulated proinflammatory cytokines, and increased apoptosis, necrosis, and necroptosis. This process is corresponded with decreased inhibitor κB (IκBα) and increased NF-κB, receptor-interacting protein kinase-1 (RIP1), RIP3, and mixed lineage kinase-like (MLKL) protein. Activation of PPAR-γ by rosiglitazone pretreatment enhanced PPAR-γ activity and prevented these changes, thereby improving the survival of septic rats. In contrast, inhibition of PPAR-γ by T007 further exacerbated the condition, dropping the survival rate to nearly 0%. In conclusion, PPAR-γ activation by reducing proinflammatory cytokines, apoptosis, and necroptosis in the myocardium prevents septic myocardial dysfunction.