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Int J Biol Sci. 2020 Jan 1;16(4):543-552. doi: 10.7150/ijbs.35256. eCollection 2020.

Inhibition of PERK Signaling Prevents Against Glucocorticoid-induced Endotheliocyte Apoptosis and Osteonecrosis of the Femoral Head.

Author information

1
Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 600 Yishan Road, Shanghai 200233, China.

Abstract

Vascular injury is considered an important pathological process during glucocorticoid (GC)-induced osteonecrosis of the femoral head (ONFH). In this study, we tried to investigate whether the endoplasmic reticulum (ER) stress is triggered in the GC-induced endotheliocyte (EC) apoptosis and ONFH. The results showed that a GC upregulated the expression of ER stress-related proteins, and PERK-CHOP signaling played an important role and induced EC apoptosis. The inhibition of PERK by GSK2656157 significantly decreased the GC-induced EC apoptosis in vitro and in vivo, thus protecting a rat model from vascular injury and significantly preventing GC-induced ONFH.

KEYWORDS:

PERK signaling; apoptosis; endoplasmic-reticulum stress; endotheliocyte; glucocorticoid; osteonecrosis of femoral head

Conflict of interest statement

Competing Interests: The authors have declared that no competing interest exists.

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