Correct regulation of insulin secretion by the pancreas is crucial for organismal function and survival. The AMPK-related kinase SIK2 (salt-inducible kinase 2) is now shown to be stabilized in pancreatic β-cells following glucose stimulation, leading to improved systemic glucose homeostasis by regulating cellular calcium flux and insulin secretion.
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Targeting IGF1 to alleviate obesity through regulating energy expenditure and fat deposition.
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State Key Laboratory of Pharmaceutical Biotechnology, Department of Endocrinology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Model Animal Research Center, Nanjing University, Nanjing, 210061, China.
Insulin-like growth factor 1 (IGF1) is a regulator of both cellular hypertrophy and lipogenesis, which are two key processes for pathogenesis of obesity. However, the in vivo role of IGF1 in the development of obesity remains unclear. Here, we show that IGF1 expression is increased in adipose tissue in obese human patients and animal models.
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College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China. Electronic address:
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Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, University of Illinois at Chicago, Chicago, IL, USA.
This review focuses on our current understanding of how growth hormone releasing hormone (GHRH): 1) stimulates GH release and synthesis from pituitary growth hormone (GH)-producing cells (somatotropes), 2) drives somatotrope proliferation, 3) is negatively regulated by somatostatin (SST), GH and IGF1, 4) is altered throughout lifespan and in response to metabolic challenges, and 5) analogues can be used clinically to treat conditions of GH excess or deficiency. Although a large body of early work provides an underpinning for our current understanding of GHRH, this review specifically highlights more recent work that was made possible by state-of-the-art analytical tools, receptor-specific agonists and antagonists, high-resolution in vivo and ex vivo imaging and the development of tissue (cell) -specific ablation mouse models, to paint a more detailed picture of the regulation and actions of GHRH.
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