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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Rep 2016 ; 6 (ä): ä Nephropedia Template TP
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HCV induces transforming growth factor ?1 through activation of endoplasmic reticulum stress and the unfolded protein response #MMPMID26927933
Chusri P; Kumthip K; Hong J; Zhu C; Duan X; Jilg N; Fusco DN; Brisac C; Schaefer EA; Cai D; Peng LF; Maneekarn N; Lin W; Chung RT
Sci Rep 2016[]; 6 (ä): ä PMID26927933show ga
HCV replication disrupts normal endoplasmic reticulum (ER) function and activates a signaling network called the unfolded protein response (UPR). UPR is directed by three ER transmembrane proteins including ATF6, IRE1, and PERK. HCV increases TGF-?1 and oxidative stress, which play important roles in liver fibrogenesis. HCV has been shown to induce TGF-?1 through the generation of reactive oxygen species (ROS) and p38 MAPK, JNK, ERK1/2, and NF?B-dependent pathways. However, the relationship between HCV-induced ER stress and UPR activation with TGF-?1 production has not been fully characterized. In this study, we found that ROS and JNK inhibitors block HCV up-regulation of ER stress and UPR activation. ROS, JNK and IRE1 inhibitors blocked HCV-activated NF?B and TGF-?1 expression. ROS, ER stress, NF?B, and TGF-?1 signaling were blocked by JNK specific siRNA. Knockdown IRE1 inhibited JFH1-activated NF?B and TGF-?1 activity. Knockdown of JNK and IRE1 blunted JFH1 HCV up-regulation of NF?B and TGF-?1 activation. We conclude that HCV activates NF?B and TGF-?1 through ROS production and induction of JNK and the IRE1 pathway. HCV infection induces ER stress and the UPR in a JNK-dependent manner. ER stress and UPR activation partially contribute to HCV-induced NF-?B activation and enhancement of TGF-?1.