Weill Center for Metabolic Health, Cardiovascular Research Institute, Department of Medicine, Weill Cornell Medicine, New York, NY.
Diabetes. 2024 Feb 1;73(2):169-177. doi: 10.2337/dbi23-0005.
Excessive adiposity in obesity is a significant risk factor for development of type 2 diabetes (T2D), nonalcoholic fatty liver disease, and other cardiometabolic diseases. An unhealthy expansion of adipose tissue (AT) results in reduced adipogenesis, increased adipocyte hypertrophy, adipocyte hypoxia, chronic low-grade inflammation, increased macrophage infiltration, and insulin resistance. This ultimately culminates in AT dysfunction characterized by decreased secretion of antidiabetic adipokines such as adiponectin and adipsin and increased secretion of proinflammatory prodiabetic adipokines including RBP4 and resistin. This imbalance in adipokine secretion alters the physiological state of AT communication with target organs including pancreatic β-cells, heart, and liver. In the pancreatic β-cells, adipokines are known to have a direct effect on insulin secretion, gene expression, cell death, and/or dedifferentiation. For instance, impaired secretion of adipsin, which promotes insulin secretion and β-cell identity, results in β-cell failure and T2D, thus presenting a potential druggable target to improve and/or preserve β-cell function. The cardiac tissue is affected by both the classic white AT-secreted adipokines and the newly recognized brown AT (BAT)-secreted BATokines or lipokines that alter lipid deposition and ventricular function. In the liver, adipokines affect hepatic gluconeogenesis, lipid accumulation, and insulin sensitivity, underscoring the importance of adipose-liver communication in the pathogenesis of nonalcoholic fatty liver disease. In this perspective, we outline what is currently known about the effects of individual adipokines on pancreatic β-cells, liver, and the heart.
肥胖症中的过度肥胖是 2 型糖尿病(T2D)、非酒精性脂肪性肝病和其他心血管代谢疾病发展的重要危险因素。不健康的脂肪组织(AT)扩张会导致脂肪生成减少、脂肪细胞肥大增加、脂肪细胞缺氧、慢性低度炎症、巨噬细胞浸润增加和胰岛素抵抗。这最终导致 AT 功能障碍,表现为抗糖尿病脂联素和 adiposin 等脂肪因子分泌减少,以及促炎促糖尿病脂联素如 RBP4 和 resistin 分泌增加。这种脂肪因子分泌的失衡改变了 AT 与胰腺 β 细胞、心脏和肝脏等靶器官的生理状态的通讯。在胰腺 β 细胞中,已知脂肪因子对胰岛素分泌、基因表达、细胞死亡和/或去分化有直接影响。例如,促进胰岛素分泌和 β 细胞特性的 adiposin 分泌受损会导致 β 细胞衰竭和 T2D,因此成为改善和/或保护 β 细胞功能的潜在可用药靶标。心脏组织受到经典白色 AT 分泌的脂肪因子和新发现的棕色 AT(BAT)分泌的 BATokines 或 lipokines 的影响,这些因子会改变脂质沉积和心室功能。在肝脏中,脂肪因子影响肝糖异生、脂质积累和胰岛素敏感性,强调了脂肪-肝脏通讯在非酒精性脂肪性肝病发病机制中的重要性。在这一观点中,我们概述了目前已知的个体脂肪因子对胰腺 β 细胞、肝脏和心脏的影响。
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