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RETRACTED ARTICLE: XBP1S protects cells from ER stress-induced apoptosis through Erk1/2 signaling pathway involving CHOP

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This article was retracted on 01 July 2021

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Abstract

The mammalian unfolded protein response (UPR) protects the cell against the stress of misfolded proteins in the endoplasmic reticulum (ER), and the transcription factor X-box binding protein 1 spliced (XBP1S), a regulator of the UPR, is known to be important for ER stress (ERS)-mediated apoptosis and cell growth, but the molecular mechanism underlying these processes remains unexplored. Here, we report that knockdown of XBP1S by an siRNA silencing approach increased the expression of ERS-associated molecules. The overexpression of XBP1S stimulated, whereas its knockdown inhibited, cell proliferation in chondrocytes and chondrosarcoma cells; in addition, overexpression of XBP1S inhibited, while its repression enhanced, ERS-mediated apoptosis in chondrocytes and chondrosarcoma cells. Furthermore, XBP1S-mediated inhibition of apoptosis in response to ERS is through the Erk1/2 signaling pathway and down-regulation CHOP transcription factor. CHOP is one of the key downstream molecules known to be involved in ERS-mediated apoptosis. Collectively, these findings reveal a novel critical role of XBP1S in ERS-mediated apoptosis and the molecular mechanisms involved.

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Acknowledgments

This work was supported by the National Science Foundation of China (No. 81171697 and No. 31040019); and the Natural Science Foundation Project of CQ CSTC (No. 2011jjA10047).

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Authors and Affiliations

  1. Department of Cell Biology and Genetics, Chongqing Medical University, Chongqing, 400016, China

    Feng-Jin Guo, Yanna Liu, Jinghua Zhou, Wenjun Zhao & Xiangzhu Li

  2. Core Facility of Development Biology, Chongqing Medical University, Chongqing, 400016, China

    Feng-Jin Guo, Yanna Liu, Jinghua Zhou, Wenjun Zhao & Xiangzhu Li

  3. Department of Cardiology, The First Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China

    Suxin Luo

  4. Department of Orthopaedic Surgery and Department of Cell Biology, New York University School of Medicine, New York, NY, 10016, USA

    Chuanju Liu

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  1. Feng-Jin Guo
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Correspondence to Feng-Jin Guo.

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Guo, FJ., Liu, Y., Zhou, J. et al. RETRACTED ARTICLE: XBP1S protects cells from ER stress-induced apoptosis through Erk1/2 signaling pathway involving CHOP. Histochem Cell Biol 138, 447–460 (2012). https://doi.org/10.1007/s00418-012-0967-7

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