Institute of Endocrinology, Sheba Medical Center, Tel-Hashomer, Israel.
Vitam Horm. 2012;90:95-123. doi: 10.1016/B978-0-12-398313-8.00004-X.
Obesity-induced insulin resistance is a primary contributing factor in the pathogenesis of type 2 diabetes. Adiponectin, an adipocyte-derived abundant plasma protein, has profound effects on systemic insulin sensitivity through direct action of the hormone on liver and muscle. The biological responses to adiponectin are mediated by two distinct receptors, AdipoR1 and AdipoR2, which differ in their affinities for adiponectin isoforms and exhibit cell type-specific effects. Disruption of AdipoR1 expression in muscle revealed a pivotal role of adiponectin/AdipoR1 in the regulation of mitochondrial biogenesis and insulin resistance. Here, we review the recent progress regarding adiponectin/AdipoRs signaling and function in skeletal muscle and summarize a range of physiological and pathophysiological conditions, as well as transcriptional and posttranscriptional mechanisms, controlling muscle AdipoR1 mRNA, and protein levels. Comprehensive understanding of the pathways that regulate AdipoRs expression in muscle is critical to benefit from the full therapeutic potential of the adiponectin-AdipoR system.
肥胖引起的胰岛素抵抗是 2 型糖尿病发病机制的主要因素。脂联素是一种脂肪细胞衍生的丰富的血浆蛋白,通过激素对肝脏和肌肉的直接作用对全身胰岛素敏感性有深远影响。脂联素的生物学反应由两个不同的受体,AdipoR1 和 AdipoR2 介导,它们在对脂联素同工型的亲和力上有所不同,并表现出细胞类型特异性的效应。肌肉中 AdipoR1 表达的破坏揭示了脂联素/AdipoR1 在调节线粒体生物发生和胰岛素抵抗中的关键作用。在这里,我们回顾了关于脂联素/AdipoRs 在骨骼肌中的信号转导和功能的最新进展,并总结了一系列生理和病理生理条件,以及控制肌肉 AdipoR1 mRNA 和蛋白水平的转录和转录后机制。全面了解调节肌肉中 AdipoRs 表达的途径对于充分利用脂联素-AdipoR 系统的治疗潜力至关重要。
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