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| 1 | Pathogenesis of hepatic steatosis:The link between hypercortisolism and non-alcoholic fatty liver disease显示文摘Based on the available literature,non alcoholic fatty liver disease or generally speaking,hepatic steatosis,is more frequent among people with diabetes and obesity,and is almost universally present amongst morbidly obese diabetic patients.Non alcoholic fatty liver disease is being increasingly recognized as a common liver condition in the developed world,with non alcoholic steatohepatitis projected to be the leading cause of liver transplantation.Previous data report that only 20%of patients with Cushing’s syndrome have hepatic steatosis.Aiming at clarifying the reasons whereby patients suffering from Cushing’s syndrome-a condition characterized by profound metabolic changes-present low prevalence of hepatic steatosis,the Authors reviewed the current concepts on the link between hypercortisolism and obesity/metabolic syndrome.They hypothesize that this low prevalence of fat accumulation in the liver of patients with Cushing’s syndrome could result from the inhibition of the so-called low-grade chronicinflammation,mainly mediated by Interleukin 6,due to an excess of cortisol,a hormone characterized by an anti-inflammatory effect.The Cushing’s syndrome,speculatively considered as an in vivo model of the hepatic steatosis,could also help clarify the mechanisms of non alcoholic fatty liver disease. | Giovanni Tarantino Carmine Finelli | 2013 | World Journal of Gastroenterology2013，19，40： | 16 |
| 2 | Lipotoxicity in the liver显示文摘Obesity due to excessive food intake and the lack of physical activity is becoming one of the most serious public health problems of the 21stcentury. With the increasing prevalence of obesity, non-alcoholic fatty liver disease is also emerging as a pandemic. While previously this pathophysiological condition was mainly attributed to triglyceride accumulation in hepatocytes,recent data show that the development of oxidative stress, lipid peroxidation, cell death, inflammation and fibrosis are mostly due to accumulation of fatty acids,and the altered composition of membrane phospholipids. In fact, triglyceride accumulation might play a protective role, and the higher toxicity of saturated or trans fatty acids seems to be the consequence of a blockade in triglyceride synthesis. Increased membrane saturation can profoundly disturb cellular homeostasis by impairing the function of membrane receptors,channels and transporters. However, it also inducesendoplasmic reticulum stress via novel sensing mechanisms of the organelle's stress receptors. The triggered signaling pathways in turn largely contribute to the development of insulin resistance and apoptosis. These findings have substantiated the lipotoxic liver injury hypothesis for the pathomechanism of hepatosteatosis.This minireview focuses on the metabolic and redox aspects of lipotoxicity and lipoapoptosis, with special regards on the involvement of endoplasmic reticulum stress responses. | Veronika Zámbó Laura Simon-Szabó Péter Szelényi va Kereszturi Gábor Bánhegyi Miklós Csala | 2013 | World Journal of Hepatology2013，5，10： | 3 |
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