PHB1 Attenuates Triptolide-induced Cardiotoxicity by Regulating Mitochondrial Dynamics in Cultured Newborn Mice Cardiomyocytes

Triptolide (TP) is widely used clinically for multiple diseases, but its cardiotoxicity significantly limits its clinical applications. The underlying mechanisms of its cardiotoxicity are still unclear. Mitochondria are crucial for cellular survival and function. Here, we found that TP induced mitochondrial dysfunction and apoptosis of cardiomyocytes, which might be the key process underlying TP-induced cardiotoxicity. Moreover, the expression of prohibitin1 (PHB1) was significantly decreased after TP treatment in a time-dependent manner. Overexpression of PHB1 alleviated mitochondrial dysfunction and inhibited apoptosis of cardiomyocytes after TP treatment. Mechanistically, PHB1 might regulate mitochondrial dynamics, which maintain normal mitochondrial function. Based on the above results, PHB1 might be a potential therapeutic target for TP-induced cardiotoxicity.