文献类型：期刊文献

英文题名：Reactive oxygen species-mediated endoplasmic reticulum stress contributes to osteocyte death induced by orthodontic compressive force

作者：Yan, Ming[1];Zhang, Yun[2];Niu, Wanting[3];Liu, Kezhou[1];Xue, Lingyun[1];Zhou, Kexin[4]

机构：[1]Hangzhou Dianzi Univ, Sch Automat, Hangzhou 310018, Peoples R China;[2]Shaoxing Univ, Coll Med, Shaoxing, Peoples R China;[3]Regis Coll, Dept STEM, Weston, MA USA;[4]Sichuan Univ, West China Sch Med, Chengdu, Peoples R China

年份：2023

外文期刊名：MICROSCOPY RESEARCH AND TECHNIQUE

收录：SCI-EXPANDED(收录号：WOS:001021578300001)、、EI(收录号：20232814367968)、Scopus(收录号：2-s2.0-85164207270)、WOS

基金：National Natural Science Foundation of China, Grant/Award Number: 81700936; Zhejiang Provincial Natural Science Foundation, Grant/Award Numbers: LTGY23H180009, LY15H180012, LY21H060001, LY21H170002

语种：英文

外文关键词：apoptosis; compressive force; endoplasmic reticulum stress; orthodontic tooth movement; osteocyte; reactive oxygen species

外文摘要：During orthodontic tooth movement (OTM), osteocytes, the most mechanosensitive cells in alveolar bone, suffer the heavy orthodontic force and initiate alveolar bone resorption on the compression side. However, the inherent mechanisms of compressive force-induced osteocyte death are not fully understood. In this study, we established an OTM model on Sprague-Dawley rats by inserting coil springs to investigate osteocyte damage on the compression side of alveolar bone. We then applied compressive force on the MLO-Y4 osteocyte-like cell line in vitro to explore whether the reactive oxygen species (ROS)-mediated endoplasmic reticulum stress (ERS) pathway is involved in compressive force-induced osteocyte death. We found that the orthodontic force caused apparent alveolar bone loss, osteocyte death, and elevated serum sclerostin and receptor activator of NF-?B ligand (RANKL) levels in rats. In vitro, compressive force inhibited cell viability but increased the LDH leakage and loss of mitochondrial membrane potential in MLO-Y4 cells. Simultaneously, it activated protein kinase RNA-like endoplasmic reticulum kinase (PERK), eukaryotic translation initiation factor 2 (eIF2a), and their downstream pro-apoptotic ERS signaling proteins and caused significant osteocyte apoptosis, which can be blocked by ERS inhibitor salubrinal. Moreover, the compressive force elevated intracellular ROS levels, while the ROS scavenger N-acetyl-L-cysteine (NAC) alleviated ERS and apoptosis in loaded osteocytes. These results suggest that the orthodontic compressive force induced osteocyte apoptosis via the ROS-mediated ERS pathway. This study first proposes the ERS pathway as a new potential pathway for regulating the rate of OTM based on osteocyte death.