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Mechanism of insulin resistance in obesity: a role of ATP
《医学前沿(英文)》 2021年 第15卷 第3期 页码 372-382 doi: 10.1007/s11684-021-0862-5
关键词: type 2 diabetes energy expenditure mitochondria hyperinsulinemia hyperglucagonemia AMPK
Insulin resistance and the metabolism of branched-chain amino acids
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《医学前沿(英文)》 2013年 第7卷 第1期 页码 53-59 doi: 10.1007/s11684-013-0255-5
Insulin resistance (IR) is a key pathological feature of metabolic syndrome and subsequently causes serious health problems with an increased risk of several common metabolic disorders. IR related metabolic disturbance is not restricted to carbohydrates but impacts global metabolic network. Branched-chain amino acids (BCAAs), namely valine, leucine and isoleucine, are among the nine essential amino acids, accounting for 35% of the essential amino acids in muscle proteins and 40% of the preformed amino acids required by mammals. The BCAAs are particularly responsive to the inhibitory insulin action on amino acid release by skeletal muscle and their metabolism is profoundly altered in insulin resistant conditions and/or insulin deficiency. Although increased circulating BCAA concentration in insulin resistant conditions has been noted for many years and BCAAs have been reported to be involved in the regulation of glucose homeostasis and body weight, it is only recently that BCAAs are found to be closely associated with IR. This review will focus on the recent findings on BCAAs from both epidemic and mechanistic studies.
关键词: branched-chain amino acids leucine isoleucine valine insulin resistance
Mechanisms of insulin resistance in obesity
null
《医学前沿(英文)》 2013年 第7卷 第1期 页码 14-24 doi: 10.1007/s11684-013-0262-6
Obesity increases the risk for type 2 diabetes through induction of insulin resistance. Treatment of type 2 diabetes has been limited by little translational knowledge of insulin resistance although there have been several well-documented hypotheses for insulin resistance. In those hypotheses, inflammation, mitochondrial dysfunction, hyperinsulinemia and lipotoxicity have been the major concepts and have received a lot of attention. Oxidative stress, endoplasmic reticulum (ER) stress, genetic background, aging, fatty liver, hypoxia and lipodystrophy are active subjects in the study of these concepts. However, none of those concepts or views has led to an effective therapy for type 2 diabetes. The reason is that, there has been no consensus for a unifying mechanism of insulin resistance. In this review article, literature is critically analyzed and reinterpreted for a new energy-based concept of insulin resistance, in which insulin resistance is a result of energy surplus in cells. The energy surplus signal is mediated by ATP and sensed by adenosine monophosphate-activated protein kinase (AMPK) signaling pathway. Decreasing ATP level by suppression of production or stimulation of utilization is a promising approach in the treatment of insulin resistance. In support, many of existing insulin sensitizing medicines inhibit ATP production in mitochondria. The effective therapies such as weight loss, exercise, and caloric restriction all reduce ATP in insulin sensitive cells. This new concept provides a unifying cellular and molecular mechanism of insulin resistance in obesity, which may apply to insulin resistance in aging and lipodystrophy.
关键词: type 2 diabetes energy expenditure inflammation lipotoxicity mitochondria hyperinsulinemia adenosine monophosphate-activated protein kinase (AMPK)
《医学前沿(英文)》 2022年 第16卷 第5期 页码 745-759 doi: 10.1007/s11684-021-0880-3
关键词: insulin resistance non-alcoholic fatty liver disease Chinese herbal medicine randomized controlled trial DNA N6-methyladenine modification
Role of exercise training on insulin resistance and TNF-α in high-fat diet rats
Hui SUN MD, Xiuling DENG MM, Fangxi XIAO MD, Lulu CHEN MD, Huiqing LI MD,
《医学前沿(英文)》 2009年 第3卷 第4期 页码 403-407 doi: 10.1007/s11684-009-0071-0
关键词: exercise training insulin resistance tumor necrosis factor-α
XIA Yanzhi, WAN Xuedong, DUAN Qiuhong, HE Shansu, WANG Ximing
《医学前沿(英文)》 2007年 第1卷 第2期 页码 200-206 doi: 10.1007/s11684-007-0038-y
Molecular mechanisms of fatty liver in obesity
null
《医学前沿(英文)》 2015年 第9卷 第3期 页码 275-287 doi: 10.1007/s11684-015-0410-2
Nonalcoholic fatty liver disease (NAFLD) covers a spectrum of liver disorders ranging from simple steatosis to advanced pathologies, including nonalcoholic steatohepatitis and cirrhosis. NAFLD significantly contributes to morbidity and mortality in developed societies. Insulin resistance associated with central obesity is the major cause of hepatic steatosis, which is characterized by excessive accumulation of triglyceride-rich lipid droplets in the liver. Accumulating evidence supports that dysregulation of adipose lipolysis and liver de novo lipogenesis (DNL) plays a key role in driving hepatic steatosis. In this work, we reviewed the molecular mechanisms responsible for enhanced adipose lipolysis and increased hepatic DNL that lead to hepatic lipid accumulation in the context of obesity. Delineation of these mechanisms holds promise for developing novel avenues against NAFLD.
关键词: nonalcoholic fatty liver disease insulin resistance obesity
Zinc homeostasis in the metabolic syndrome and diabetes
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《医学前沿(英文)》 2013年 第7卷 第1期 页码 31-52 doi: 10.1007/s11684-013-0251-9
Zinc (Zn) is an essential mineral that is required for various cellular functions. Zn dyshomeostasis always is related to certain disorders such as metabolic syndrome, diabetes and diabetic complications. The associations of Zn with metabolic syndrome, diabetes and diabetic complications, thus, stem from the multiple roles of Zn: (1) a constructive component of many important enzymes or proteins, (2) a requirement for insulin storage and secretion, (3) a direct or indirect antioxidant action, and (4) an insulin-like action. However, whether there is a clear cause-and-effect relationship of Zn with metabolic syndrome, diabetes, or diabetic complications remains unclear. In fact, it is known that Zn deficiency is a common phenomenon in diabetic patients. Chronic low intake of Zn was associated with the increased risk of diabetes and diabetes also impairs Zn metabolism. Theoretically Zn supplementation should prevent the metabolic syndrome, diabetes, and diabetic complications; however, limited available data are not always supportive of the above notion. Therefore, this review has tried to summarize these pieces of available information, possible mechanisms by which Zn prevents the metabolic syndrome, diabetes, and diabetic complications. In the final part, what are the current issues for Zn supplementation were also discussed.
关键词: zinc zinc transporters metallothionein diabetes diabetic complications insulin resistance antioxidant
Xiaoqing Li, Xinxin Li, Genbei Wang, Yan Xu, Yuanyuan Wang, Ruijia Hao, Xiaohui Ma
《医学前沿(英文)》 2018年 第12卷 第6期 页码 688-696 doi: 10.1007/s11684-018-0662-8
Xiao Ke Qing (XKQ) granule has been clinically used to treat type 2 diabetes mellitus (T2DM) for 10 years in Chinese traditional medication. However, its mechanisms against hyperglycemia remain poorly understood. This study aims to investigate XKQ mechanisms on diabetes and diabetic liver disease by using the KKAy mice model. Our results indicate that XKQ can significantly reduce food and water intake. XKQ treatment also remarkably decreases both the fasting blood glucose and blood glucose in the oral glucose tolerance test. Additionally, XKQ can significantly decrease the serum alanine aminotransferase level and liver index and can alleviate the fat degeneration in liver tissues. Moreover, XKQ can ameliorate insulin resistance and upregulate the expression of IRS-1, PI3K (p85), p-Akt, and GLUT4 in the skeletal muscle of KKAy mice. XKQ is an effective drug for T2DM by ameliorating insulin resistance and regulating the PI3K/Akt signaling pathway in the skeletal muscle.
关键词: XKQ type 2 diabetes mellitus KKAy mice PI3K/Akt pathway diabetic liver disease
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《医学前沿(英文)》 2015年 第9卷 第2期 页码 139-145 doi: 10.1007/s11684-015-0377-z
In obesity, chronic inflammation is believed to induce insulin resistance and impairs adipose tissue function. Although this view is supported by a large body of literature, it has been challenged by growing evidence that pro-inflammatory cytokines may favor insulin sensitivity through induction of energy expenditure. In this review article, interleukin 15 (IL-15) is used as a new example to explain the beneficial effects of the pro-inflammatory cytokines. IL-15 is secreted by multiple types of cells including macrophages, neutrophils and skeletal muscle cells. IL-15 expression is induced in immune cells by endotoxin and in muscle cells by physical exercise. Its transcription is induced by transcription factor NF-κB. IL-15 binds to its receptor that contains three different subunits (α, β and γ) to activate JAK/STAT, PI3K/Akt, IKK/NF-κB and JNK/AP1 pathways in cells. In the regulation of metabolism, IL-15 reduces weight gain without inhibiting food intake in rodents. IL-15 suppresses lipogenesis, stimulates brown fat function, improves insulin sensitivity through weight loss and energy expenditure. In human, circulating IL-15 is negatively associated with body weight. In the immune system, IL-15 stimulates proliferation and differentiation of T cells, NK cells, monocytes and neutrophils. In the anti-obesity effects of IL-15, T cells and NK cells are not required, but leptin receptor is required. In summary, evidence from human and rodents supports that the pro-inflammatory cytokine IL-15 may enhance energy expenditure to protect the body from obesity and type 2 diabetes. The mechanism of IL-15 action remains to be fully uncovered in the regulation of energy expenditure.
关键词: inflammation obesity cytokine energy expenditure insulin resistance
Metformin and metabolic diseases: a focus on hepatic aspects
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《医学前沿(英文)》 2015年 第9卷 第2期 页码 173-186 doi: 10.1007/s11684-015-0384-0
Metformin has been widely used as a first-line anti-diabetic medicine for the treatment of type 2 diabetes (T2D). As a drug that primarily targets the liver, metformin suppresses hepatic glucose production (HGP), serving as the main mechanism by which metformin improves hyperglycemia of T2D. Biochemically, metformin suppresses gluconeogenesis and stimulates glycolysis. Metformin also inhibits glycogenolysis, which is a pathway that critically contributes to elevated HGP. While generating beneficial effects on hyperglycemia, metformin also improves insulin resistance and corrects dyslipidemia in patients with T2D. These beneficial effects of metformin implicate a role for metformin in managing non-alcoholic fatty liver disease. As supported by the results from both human and animal studies, metformin improves hepatic steatosis and suppresses liver inflammation. Mechanistically, the beneficial effects of metformin on hepatic aspects are mediated through both adenosine monophosphate-activated protein kinase (AMPK)-dependent and AMPK-independent pathways. In addition, metformin is generally safe and may also benefit patients with other chronic liver diseases.
关键词: metformin diabetes hepatic steatosis inflammatory response insulin resistance
Ruiting Han, Junli Ma, Houkai Li
《医学前沿(英文)》 2018年 第12卷 第6期 页码 645-657 doi: 10.1007/s11684-018-0645-9
关键词: gut microbiota NAFLD obesity insulin resistance bile acids probiotic
Effects of resistin on skeletal glucose metabolism
Fang-Ping LI, Zhi-Zhen LI, Miao ZHANG, Li YAN, Zu-Zhi FU
《医学前沿(英文)》 2010年 第4卷 第3期 页码 329-335 doi: 10.1007/s11684-010-0091-9
Huining HE, Junxiao YE, Jianyong SHENG, Jianxin WANG, Yongzhuo HUANG, Guanyi CHEN, Jingkang WANG, Victor C YANG
《化学科学与工程前沿(英文)》 2013年 第7卷 第1期 页码 9-19 doi: 10.1007/s11705-013-1306-9
关键词: insulin cell penetrating peptide mucoadhesive composites oral delivery
Effects of resistin on insulin signaling in endothelial cells
Zhizhen LI, Fangping LI, Jianhong YE, Li YAN, Zuzhi FU
《医学前沿(英文)》 2009年 第3卷 第2期 页码 136-140 doi: 10.1007/s11684-009-0029-2
关键词: resistin endothelium nitric oxide endothelial nitric oxide synthase Akt-binding protein mouse
标题 作者 时间 类型 操作
Lingguizhugan Decoction, a Chinese herbal formula, improves insulin resistance in overweight/obese subjects
期刊论文
Role of exercise training on insulin resistance and TNF-α in high-fat diet rats
Hui SUN MD, Xiuling DENG MM, Fangxi XIAO MD, Lulu CHEN MD, Huiqing LI MD,
期刊论文
Inhibition of protein kinase B by Palmitate in the insulin signaling of HepG2 cells and the preventiveeffect of Arachidonic acid on insulin resistance
XIA Yanzhi, WAN Xuedong, DUAN Qiuhong, HE Shansu, WANG Ximing
期刊论文
Xiao Ke Qing improves glycometabolism and ameliorates insulin resistance by regulating the PI3K/Akt pathway
Xiaoqing Li, Xinxin Li, Genbei Wang, Yan Xu, Yuanyuan Wang, Ruijia Hao, Xiaohui Ma
期刊论文
Beneficial metabolic activities of inflammatory cytokine interleukin 15 in obesity and type 2 diabetes
null
期刊论文
Mechanistic and therapeutic advances in non-alcoholic fatty liver disease by targeting the gut microbiota
Ruiting Han, Junli Ma, Houkai Li
期刊论文
Effects of resistin on skeletal glucose metabolism
Fang-Ping LI, Zhi-Zhen LI, Miao ZHANG, Li YAN, Zu-Zhi FU
期刊论文
Overcoming oral insulin delivery barriers: application of cell penetrating peptide and silica-based nanoporous
Huining HE, Junxiao YE, Jianyong SHENG, Jianxin WANG, Yongzhuo HUANG, Guanyi CHEN, Jingkang WANG, Victor C YANG
期刊论文