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Ex vivo bupivacaine treatment results in increasedadipogenesis of skeletal muscle cells in the rat

机译:离体布比卡因治疗可导致大鼠骨骼肌细胞成脂增加

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摘要

Intramuscular adipose tissue (IMAT) is observed in some skeletal muscle pathologies. IMAT is implicated not only in thedisorders of muscle contraction, but also of metabolism and insulin sensitivity due to its nature as a secretary organ. Severalstudies indicate the presence of cells with adipogenic potential in skeletal muscle. However, the mechanism of fatespecification that triggers these cells to enter an adipogenic program in vivo remains to be solved. In the present study, weexamined whether activation of the adipogenic program of muscle-resident cells precedes their proliferation upon muscleinjury. For this purpose, muscle injury was induced by injecting bupivacaine (BPVC) to excised skeletal muscle ex vivo. Cellsisolated from ex vivo BPVC-treated muscle exhibited higher adipogenic potential than those from saline-treated muscle.Pre-plating exposure of skeletal muscle cells to basic fibroblast growth factor (bFGF) mimicked the effect of ex vivoBPVC-treatment, suggesting that bFGF released from extracellular matrix in response to muscle injury activates theiradipogenic program. Interestingly, the number of myotubes were significantly reduced in the culture from BPVC-treatedmuscle, suggesting that adipocytes negatively regulate myogenesis.
机译:在某些骨骼肌病理中观察到肌内脂肪组织(IMAT)。由于其作为秘书器官的性质,IMAT不仅与肌肉收缩的疾病有关,而且与代谢和胰岛素敏感性有关。多项研究表明骨骼肌中存在具有成脂潜能的细胞。但是,触发这些细胞进入体内成脂程序的命运确定机制尚待解决。在本研究中,我们检查了肌肉驻留细胞脂肪形成程序的激活是否先于肌肉损伤后的增殖。为此,通过将布比卡因(BPVC)离体注射到切除的骨骼肌上来诱发肌肉损伤。从离体BPVC处理过的肌肉中分离出的细胞显示出更高的成脂潜能。骨骼肌细胞在碱性成纤维细胞生长因子(bFGF)的预铺板暴露中模仿了离体BPVC处理的效果,表明从响应肌肉损伤的细胞外基质激活其脂肪形成程序。有趣的是,在用BPVC处理过的肌肉中,培养物中的肌管数量显着减少,这表明脂肪细胞负调控着肌发生。

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