Original articleThe vicious circle between mitochondrial oxidative stress and dynamic abnormality mediates Triethylene glycol dimethacrylate (cas 109-16-0)-induced preodontoblast apoptosis
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Add time:08/20/2019 Source:sciencedirect.com
Oxidative stress (OS) plays crucial roles in triethylene glycol dimethacrylate (TEGDMA, a major component in dental resin)-induced apoptosis of dental pulp cells. Mitochondria are important target organelles for regulating the balance of OS, meanwhile, imbalance of the mitochondrial dynamic associated with mitochondrial dysfunction is one major molecular mechanism for oxidative damages. However, whether these mitochondrial dependent pathways were involved in the apoptosis of dental pulp cells induced by TDGDMA remains unclarified. We demonstrated that TEGDMA decreased viability and induced apoptosis of mouse preodontoblasts (mDPC6T cell line) in a time- and dose-dependent manner. Furthermore, TEGDMA elevated the mitochondrial OS status and induced mitochondrial dysfunction, as reflected by the significant decrease of mitochondrial membrane potential, ATP production, the activity of Complex III and citrate synthase. In this process, we detected a dramatically impaired mitochondrial dynamic that was reflected by significantly enhanced mitochondrial fragmentation. Consistently, we also found a significant enhancement of the key upstream regulators for mitochondrial fission, such as short form of optic atrophy 1, dynamic related protein 1 oligomer and Fission 1. The respective inhibition of mitochondrial OS or mitochondrial fission could mutually attenuate each other, thereby significantly preventing both mitochondrial dysfunction and cell apoptosis. In conclusion, TEGDMA-induced preodontoblasts apoptosis was mediated by the vicious circle between mitochondrial OS and dynamic abnormality, which represented a new target to prevent TEGDMA-induced dental pulp cells apoptosis.
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