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首页> 外文期刊>Journal of bone and mineral research: the official journal of the American Society for Bone and Mineral Research >MacrophageGIT1Contributes to Bone Regeneration by Regulating Inflammatory Responses in anERK/NRF2-Dependent Way
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MacrophageGIT1Contributes to Bone Regeneration by Regulating Inflammatory Responses in anERK/NRF2-Dependent Way

机译:通过在依赖于ANERK / NRF2依赖的方式调节炎症反应来扩张宏观物质再生

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Despite the best treatment, approximately 10% of fractures still face undesirable repair. Recently, many studies have focused on the importance of macrophages in bone repair; however, the cellular mechanisms by which they work are not yet fully understood. In this study, we explored the functions of macrophage G-protein-coupled receptor interacting protein 1 (GIT1) in healing a tibial monocortical defect model. Using GIT1(flox/flox)Lyz2-Cre (GIT1 CKO) mice, we observed that a GIT1 deficiency in the macrophages led to an exacerbation of interleukin 1 beta (IL1 beta) production, more M1-like macrophage infiltration, and impaired intramembranous ossification in vivo. The results of in vitro assays further indicated that the macrophage GIT1 plays a critical role in several cellular processes in response to lipopolysaccharide (LPS), such as anti-oxidation, IL1 beta production alleviation, and glycolysis control. Although GIT1 has been recognized as a scaffold protein, our data clarified that GIT1-mediated extracellular-signal-regulated kinase (ERK) phosphorylation could activate nuclear factor (erythroid-derived 2)-like 2 (NRF2) in macrophages after LPS treatment. Moreover, we demonstrated that macrophage GIT1-activated ERK/NRF2 negatively regulates the 6-phosphofructo-2-kinase/fructose-2, 6-biphosphatase 3 (PFKFB3), facilitating the decrease of glycolysis. Our findings uncovered a previously unrecognized role of GIT1 in regulating ERK/NRF2 in macrophages to control the inflammatory response, suggesting that macrophage GIT1 could be a potential target to improve bone regeneration. (c) 2020 The Authors.Journal of Bone and Mineral Researchpublished by American Society for Bone and Mineral Research..
机译:尽管得到了最好的治疗,但仍有约10%的骨折需要进行不理想的修复。最近,许多研究集中在巨噬细胞在骨修复中的重要性;然而,它们工作的细胞机制尚未完全了解。在本研究中,我们探讨了巨噬细胞G蛋白偶联受体相互作用蛋白1(GIT1)在胫骨单皮质缺损模型愈合中的作用。使用GIT1(flox/flox)Lyz2-Cre(GIT1-CKO)小鼠,我们观察到巨噬细胞中的GIT1缺陷导致白细胞介素1β(IL1β)产生加剧,更多M1样巨噬细胞浸润,并损害体内膜内骨化。体外实验结果进一步表明,巨噬细胞GIT1在响应脂多糖(LPS)的几个细胞过程中起着关键作用,例如抗氧化、减轻IL1β产生和糖酵解控制。虽然GIT1被认为是一种支架蛋白,但我们的数据表明,在LPS处理后,GIT1介导的细胞外信号调节激酶(ERK)磷酸化可以激活巨噬细胞中的核因子(红系衍生的2)-样2(NRF2)。此外,我们还证明巨噬细胞GIT1激活的ERK/NRF2负性调节6-磷酸果糖-2激酶/果糖-2,6-二磷酸酶3(PFKFB3),促进糖酵解的减少。我们的发现揭示了GIT1在调节巨噬细胞ERK/NRF2以控制炎症反应中的作用,这表明巨噬细胞GIT1可能是促进骨再生的潜在靶点。(c) 2020年,作者。《骨与矿物质研究杂志》由美国骨与矿物质研究学会出版。。

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