IRE1α arm of unfolded protein response in muscle-specific TGF-β signaling-mediated regulation of muscle cell immunological properties

Cellular & Molecular Biology Letters

Research

Ruicai Gu¹  Jijie Hu²  Zhaohong Liao³  Haiqiang Lan³  Jiangwei Xiao³  Jingwen Huang³  Xiaoting Jian³  Han Wang³  Hua Liao³ 

[1] Department of Cell Biology, University of Oklahoma Health Science Center, Oklahoma City, OK, USA;Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, 510515, Guangzhou, China;Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Department of Anatomy, School of Basic Medical Science, Southern Medical University, 510515, Guangzhou, China;

关键词: Myofiber;    Inflammation;    TGF-β;    UPR;    IRE1α;    p38 MAPK;   

DOI  :  10.1186/s11658-023-00429-w

 received in 2022-09-10, accepted in 2023-02-06,  发布年份 2023

来源: Springer

【 摘 要 】

Endoplasmic reticulum stress (ERS) and the unfolded protein response (UPR) are involved in various muscle pathological states. The IRE1α arm of UPR can affect immunological properties of myofiber through restraining p38 mitogen-activated protein kinases (MAPK) activation under inflammatory milieu. However, the relevant pathway molecules regulating the initiation of the IRE1α arm in myofiber remain unclear. In this work, expression of transforming growth factor-beta (TGF-β) and TGF-β receptor II (TGF-βr2), and UPR pathway activation were examined in cardiotoxin (CTX)-damaged mouse muscle, which revealed the activation of TGF-β signaling and UPR in CTX-damaged muscle and in regenerating myofibers. Using control or transgenic mice with TGF-βr2 deleted in skeletal muscle (SM TGF-βr2−/−) and the derived primary differentiating myogenic precursor cells (MPCs) treated with/without ERS activator or inhibitor, IRE1α pathway inhibitor, or TGF-β signaling activator, this study further revealed an essential role of intrinsic TGF-β signaling in regulating muscle cell to express inflammation-related molecules including H-2Kb, H2-Eα, TLR3, and special myokines. TGF-β signaling prompted UPR IRE1α arm and restrained p38 MAPK activation in myofiber under inflammatory milieu. This study uncovers a previously unrecognized function of TGF-β signaling acting as an upstream factor controlling myofiber immune capacities in the inflamed state through the UPR–IRE1α–p38 MAPK pathway.

【 授权许可】

CC BY   
© The Author(s) 2023

【 图 表 】

Fig. 1

Fig. 5

12302_2023_718_Article_IEq52.gif

Fig. 2

Fig. 7

Fig. 4

Fig. 3

12974_2023_2714_Article_IEq5.gif

Fig. 3

40517_2023_248_Article_IEq19.gif