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TUDCA inhibits EV71 replication by regulating ER stress signaling pathway and suppressing autophagy
Siwen Wang1, Rui Liu1, Yuting Zhou2
1Molecular Diagnostic Laboratory, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210003, PR China; Children's Health Center, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210003, PR China; The Second Clinical College of Nanjing Medical University, Nanjing, Jiangsu 210011, PR China.
Abstract:
Tauroursodeoxycholic acid (TUDCA) is a naturally occurring hydrophilic bile acid that alleviates endoplasmic reticulum (ER) stress and inhibits apoptosis, thereby protecting cells. Previous studies have shown that enterovirus 71 (EV71) infection modulates ER stress and induces autophagy to assist viral replication. This study observed the effects of TUDCA pretreatment on HeLa and Vero cells infected with EV71, finding that TUDCA inhibits EV71 replication in TUDCA pretreated HeLa and Vero cells in a dose-dependent manner. We found that TUDCA pretreatment inhibited EV71 replication by regulating three branches of UPR, that is up-regulated ATF6, down-regulated both PERK and IRE1. The results also indicated that autophagy which is downstream of UPR, was inhibited either. The results indicate that TUDCA inhibits EV71 replication by regulating UPR sensor proteins and autophagy following ER stress.
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