Antiapoptotic and anti-inflammatory effects of <i>Ppar</i>γ agonist, pioglitazone, reversed Dox-induced cardiotoxicity through mediating of miR-130a downregulation in C57BL/6 mice

Abstract

Doxorubicin (Dox) is an antitumor agent widely used in cancer therapy, with notable side effects of cardiac toxicity. Peroxisome proliferator-activated receptor gamma (PPAR gamma), is a transcriptional factor with antiapoptotic and anti-inflammatory properties. Recently we indicated that cardiac toxicity of Dox was due to upregulation of miR-130a and further suppressive effect on cardiac Ppar gamma in vitro. In this study, we extended our proposed hypothesis in vivo. To achieve this, pioglitazone (Pio) and GW9662 were used as the specific agonist and antagonist of Ppar gamma to treat Dox-injected mice. Heart function, apoptosis, and inflammation in heart tissue were studied. Pretreatment of Dox-injected mice with Pio resulted in elevated expression of Ppar gamma and suppression of miR-130a. However, GW9662 pretreatment was unable to increase miR-130a expression. Pio pretreatment led to partially cardiac toxicity limitation of Dox whereas GW9662 caused heart damage. Finally, our observation determined that activation of Ppar gamma was not adequate to reverse the Dox-induced toxicity completely.