Rapamycin protects mouse skin from ultraviolet B-induced photodamage by modulating Hspb2-mediated autophagy and apoptosis

作者全名："Li, Ang; Chen, Ai-Jun; Xu, Jing; Wen, Zhu-Yuan; Bai, Gen-Long; Wang, Zi-Yue; Jiang, Yu-Xin; Wang, Ping"

作者地址："[Li, Ang; Chen, Ai-Jun; Xu, Jing; Bai, Gen-Long; Wang, Zi-Yue; Jiang, Yu-Xin; Wang, Ping] Chongqing Med Univ, Affiliated Hosp 1, Dept Dermatol, Chongqing 400016, Peoples R China; [Wen, Zhu-Yuan] Chongqing Med Univ, Coll Pediat, Chongqing 400016, Peoples R China"

通信作者："Wang, P (通讯作者)，Chongqing Med Univ, Affiliated Hosp 1, Dept Dermatol, Chongqing 400016, Peoples R China."

来源：MOLECULAR BIOLOGY REPORTS

ESI学科分类：MOLECULAR BIOLOGY & GENETICS

WOS号：WOS:001137201300005

JCR分区：Q4

影响因子：2.8

年份：2024

卷号：51

期号：1

开始页：　

结束页：　

文献类型：Article

关键词：UVB; Photodamage; Rapamycin; Autophagy; Apoptosis

摘要："BackgroundContinuous exposure to UVB is the main extrinsic cause of skin photodamage, which is associated with oxidative stress, DNA damage, apoptosis and degradation of collagen. Rapamycin, a mechanistic target inhibitor of rapamycin complex 1 (mTORC1), has been shown to play a crucial role anti-tumor and aging retardation, but its mechanism of action in UVB-induced photodamage still remains unknown. In this study, we investigated the role of rapamycin and Hspb2 (also known as Hsp27) in UVB-induced photodamage in mice.Methods and resultsWe constructed skin acute photodamage models on the ears of WT and Hspb2 KO mice, respectively, and administered rapamycin treatment. Histological results showed that knockout of the hspb2 exacerbated the skin damage, as evidenced by thickening of the epidermis, breakage and disruption of collagen fibers and reduction in their number, which is reversed by rapamycin treatment. In addition, hspb2 knockout promoted UVB-induced apoptosis and reduced autophagy levels, with a significant increase in p53 levels and Bax/Bcl-2 ratio, a reduction in LC3II/I ratio and an increase in p62 levels in the KO mice compared to those in WT mice after the same dose of UVB irradiation. Rapamycin was also found to inhibit collagen degradation induced by hspb2 knockdown through activation of the TGF-beta/Smad signaling pathway.ConclusionsRapamycin can alleviate skin photodamage from Hspb2 knockout to some extent. It may be a potential therapeutic drug for skin photodamage.Graphical abstractIn this study, we investigated the role of rapamycin and Hspb2 in UVB-induced photodamage in mice. Histological results showed that knockout of the hspb2 exacerbated the skin damage, as evidenced by thickening of the epidermis, breakage and disruption of collagen fibers and reduction in their number, which is reversed by rapamycin treatment. In addition, hspb2 knockout promoted UVB-induced apoptosis and reduced autophagy levels. Rapamycin was also found to inhibit collagen degradation induced by hspb2 knockdown through activation of the TGF-beta/Smad signaling pathway. We conclude that rapamycin and Hspb2 exert a synergistic protective effect in skin photodamage."

基金机构：National Natural Science Foundation of China; Animal Experimental Center of Chongqing Medical University

基金资助正文：We thank the Animal Experimental Center of Chongqing Medical University and the Laboratory Research Center of the First Affiliated Hospital of Chongqing Medical University for technical assistance.