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| 1 | interrelationships between ghrelin, insulin and glucose homeostasis: physiological relevance显示文摘Ghrelin is a 28 amino acid peptide mainly derived from the oxyntic gland of the stomach. Both acylated(AG) and unacylated(UAG) forms of ghrelin are found in the circulation. Initially, AG was considered as the only bioactive form of ghrelin. However, recent advances indicate that both AG and UAG exert distinct and common effects in organisms. Soon after its discovery, ghrelin was shown to promote appetite and adiposity in animal and human models. In response to these anabolic effects, an impressive number of elements have suggested the influence of ghrelin on the regulation of metabolic functions and the development of obesityrelated disorders. However, due to the complexity ofits biochemical nature and the physiological processes it governs, some of the effects of ghrelin are still debated in the literature. Evidence suggests that ghrelin influences glucose homeostasis through the modulation of insulin secretion and insulin receptor signaling. On the other hand, insulin was also shown to influence circulating levels of ghrelin. Here, we review the relationship between ghrelin and insulin and we describe the impact of this interaction on the modulation of glucose homeostasis. | FranCois Chabot Alexandre Caron Mathieu Laplante David H St-Pierre | 2014 | World Journal of Diabetes2014，5，3： | 9 |
| 2 | Defect of insulin signal in peripheral tissues: important role of ceramide显示文摘In healthy people,balance between glucose production and its utilization is precisely controlled.When circulating glucose reaches a critical threshold level,pancreaticβcells secrete insulin that has two major actions:to lower circulating glucose levels by facilitating its uptake mainly into skeletal muscle while inhibiting its production by the liver.Interestingly,dietary triglycerides are the main source of fatty acids to fulfill energy needs of oxidative tissues.Normally,the unconsumed fraction of excess of fatty acids is stored in lipid droplets that are localized in adipocytes to provide energy during fasting periods.Thus,adipose tissue acts as a trap for fatty acid excess liberated from plasma triglycerides.When the buffering action of adipose tissue to store fatty acids is impaired,fatty acids that build up in othertissues are metabolized as sphingolipid derivatives such as ceramides.Several studies suggest that ceramides are among the most active lipid second messengers to inhibit the insulin signaling pathway and this review describes the major role played by ceramide accumulation in the development of insulin resistance of peripherals tissues through the targeting of specific proteins of the insulin signaling pathway. | Rima Hage Hassan Olivier Bourron Eric Hajduch | 2014 | World Journal of Diabetes2014，5，3： | 5 |
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