R Vettor, A M Lombardi, R Fabris, R Serra, C Pagano, C Macor, G Federspil
{"title":"动物模型中的底物竞争和胰岛素作用。","authors":"R Vettor, A M Lombardi, R Fabris, R Serra, C Pagano, C Macor, G Federspil","doi":"10.1038/sj.ijo.0801271","DOIUrl":null,"url":null,"abstract":"<p><p>Increased basal plasma FFA and lactate concentrations are often present in obesity and may deeply affect insulin action. The inhibition of glucose transport or phosphorylation is thought to be involved in this phenomenon, but the molecular mechanisms on the basis are still unknown. In our laboratory we observed that a chronic infusion of Intralipid plus heparin in rats significantly decreased the insulin dependent-glucose uptake, as well as GLUT4 gene expression in muscular tissue. On the other hand it has been shown that an enhanced plasma lactate concentration may increase insulin secretion and hepatic insulin clearance. Moreover we observed that chronic hyperlactatemia in rats is able to decrease glucose uptake in muscles, while reducing GLUT4 mRNA and protein in the same tissues. In obesity, lactate and FFA overproduction from visceral fat may therefore play a synergic role in reducing insulin sensitivity.</p>","PeriodicalId":14227,"journal":{"name":"International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2000-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1038/sj.ijo.0801271","citationCount":"17","resultStr":"{\"title\":\"Substrate competition and insulin action in animal models.\",\"authors\":\"R Vettor, A M Lombardi, R Fabris, R Serra, C Pagano, C Macor, G Federspil\",\"doi\":\"10.1038/sj.ijo.0801271\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Increased basal plasma FFA and lactate concentrations are often present in obesity and may deeply affect insulin action. The inhibition of glucose transport or phosphorylation is thought to be involved in this phenomenon, but the molecular mechanisms on the basis are still unknown. In our laboratory we observed that a chronic infusion of Intralipid plus heparin in rats significantly decreased the insulin dependent-glucose uptake, as well as GLUT4 gene expression in muscular tissue. On the other hand it has been shown that an enhanced plasma lactate concentration may increase insulin secretion and hepatic insulin clearance. Moreover we observed that chronic hyperlactatemia in rats is able to decrease glucose uptake in muscles, while reducing GLUT4 mRNA and protein in the same tissues. In obesity, lactate and FFA overproduction from visceral fat may therefore play a synergic role in reducing insulin sensitivity.</p>\",\"PeriodicalId\":14227,\"journal\":{\"name\":\"International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2000-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1038/sj.ijo.0801271\",\"citationCount\":\"17\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1038/sj.ijo.0801271\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1038/sj.ijo.0801271","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Substrate competition and insulin action in animal models.
Increased basal plasma FFA and lactate concentrations are often present in obesity and may deeply affect insulin action. The inhibition of glucose transport or phosphorylation is thought to be involved in this phenomenon, but the molecular mechanisms on the basis are still unknown. In our laboratory we observed that a chronic infusion of Intralipid plus heparin in rats significantly decreased the insulin dependent-glucose uptake, as well as GLUT4 gene expression in muscular tissue. On the other hand it has been shown that an enhanced plasma lactate concentration may increase insulin secretion and hepatic insulin clearance. Moreover we observed that chronic hyperlactatemia in rats is able to decrease glucose uptake in muscles, while reducing GLUT4 mRNA and protein in the same tissues. In obesity, lactate and FFA overproduction from visceral fat may therefore play a synergic role in reducing insulin sensitivity.