Liu Yang, Liu Peng, Hu Yajie, Cao Yu, Lu Jingjing, Yang Yuying, Lv Hongming, Lian Shuai, Xu Bin, Li Shize
National Experimental Teaching Demonstration Center of Animal Medicine Foundation, College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, China.
Front Mol Biosci. 2021 Jul 29;8:685993. doi: 10.3389/fmolb.2021.685993. eCollection 2021.
The main danger of cold stress to animals in cold regions is systemic metabolic changes and protein synthesis inhibition. Cold-induced RNA-binding protein is a cold shock protein that is rapidly up-regulated under cold stimulation in contrast to the inhibition of most proteins and participates in multiple cellular physiological activities by regulating targets. Therefore, this study was carried out to investigate the possible mechanism of CIRP-mediated glucose metabolism regulation and survival promotion in skeletal muscle after acute cold exposure. Skeletal muscle and serum from mice were obtained after 0, 2, 4 and 8 h of acute hypothermia exposure. Subsequently, the changes of CIRP, metabolism and apoptosis were examined. Acute cold exposure increased energy consumption, enhanced glycolysis, increased apoptosis, and up-regulated CIRP and phosphorylation of AKT. In addition, CIRP overexpression in C2C12 mouse myoblasts at each time point under 37°C and 32°C mild hypothermia increased AKT phosphorylation, enhanced glucose metabolism, and reduced apoptosis. CIRP knockdown by siRNA interference significantly reduced the AKT phosphorylation of C2C12 cells. Wortmannin inhibited the AKT phosphorylation of skeletal muscle after acute cold exposure, thereby inhibiting glucose metabolism and aggravating apoptosis. Taken together, acute cold exposure up-regulates CIRP in mouse skeletal muscle, which regulates glucose metabolism and maintains energy balance in skeletal muscle cells through the AKT signaling pathway, thus slowing down the apoptosis of skeletal muscle cells.
寒冷地区动物冷应激的主要危险是全身代谢变化和蛋白质合成抑制。冷诱导RNA结合蛋白是一种冷休克蛋白,与大多数蛋白质受到抑制相反,它在冷刺激下迅速上调,并通过调控靶标参与多种细胞生理活动。因此,本研究旨在探讨急性冷暴露后CIRP介导的骨骼肌葡萄糖代谢调节及促进存活的可能机制。在急性低温暴露0、2、4和8小时后获取小鼠的骨骼肌和血清。随后,检测CIRP、代谢和凋亡的变化。急性冷暴露增加能量消耗、增强糖酵解、增加凋亡,并上调CIRP和AKT磷酸化。此外,在37°C和32°C轻度低温下的每个时间点,C2C12小鼠成肌细胞中CIRP的过表达增加了AKT磷酸化、增强了葡萄糖代谢并减少了凋亡。通过siRNA干扰敲低CIRP显著降低了C2C12细胞的AKT磷酸化。渥曼青霉素抑制急性冷暴露后骨骼肌的AKT磷酸化,从而抑制葡萄糖代谢并加重凋亡。综上所述,急性冷暴露上调小鼠骨骼肌中的CIRP,其通过AKT信号通路调节葡萄糖代谢并维持骨骼肌细胞的能量平衡,从而减缓骨骼肌细胞的凋亡。