Possible Mechanisms of Insulin Resistance in Obese Subjects
DOI:
https://doi.org/10.17140/OROJ-2-118Keywords:
triglyceride, adipocytesAbstract
Obesity is characterized by excessive triglyceride accumulation in adipose tissue cells
(adipocytes); the adipocytes are not just a reservoir for storage of energy in the form of triglyceride, but more importantly act as endocrine cells; they secrete several hormones as leptin and
adiponectin, also secrete adipokines as TNF-α, Interleukin 6 (IL-6) and Plasminogen activator
inhibitor-1 (PAI-1). In obese subjects, adipocytes release high levels of free fatty acids (FFA)
and its metabolites; Diacylglycerol (DAG) and ceramide.1
Acquired insulin resistance is associated with obesity. Insulin resistance is classically
defined as impaired insulin-mediated glucose disposal in skeletal muscle. There are several
mechanisms responsible for insulin resistance in obese subjects, which can be classified into
either to activation of inflammatory pathways or changes in lipoproteins and apoprotein concentrations as result of associated dyslipidemias
References
Muoio DM. Intramuscular triacylglycerol and insulin resis-tance: guilty as charged or wrongly accused? Biochim Biophys Acta. 2010; 1801(3): 281-288. doi: 10.1016/j.bbalip.2009.11.007
Vergès B, Petit JM, Duvillard L, et al. Adiponectin is an important determinant of apoA-I catabolism. Arterioscler Thromb Vasc Biol. 2006; 26: 1364-1369. doi: 10.1161/01. ATV.0000219611.50066.bd
Sun X, Liu F. Phosphorylation of IRS proteins. Yin-Yang regulation of insulin signaling. Vitam Horm. 2009; 80: 351-387. doi: 10.1016/S0083-6729(08)00613-4
Odegaard J, Ricardo-Gonzalez R, Red E, et al. Alternative M2 activation of Kupffer cells by PPARδ ameliorates obesity-induced insulin resistance. Cell Metabolism. 2008; 7(6): 496- 507. doi: 10.1016/j.cmet.2008.04.003
Yadav A, Kataria M, Saini V, Yadav A. Role of leptin and adi-ponectin in insulin resistance. Clin Chim Acta. 2013; 18(417): 80-84.
Demerdash H, Sharara G, Katri K. Differential effects of gastric bypass and banding on the cardiovascular risk profile in morbidly obese subjects: The correlation with plasma apolipo-protein A-IV concentration. Alexandria Journal of Medicine. 2013; 49(1): 17-23. doi: 10.1016/j.ajme.2012.07.002
Haas M, Attie A, Biddinge S. The regulation of ApoB metabo-lism by insulin. Trends in Endocrinology and Metabolism. 2013; 24(8): 339-397. doi: 10.1016/j.tem.2013.04.001
van der Ham RL, Alizadeh Dehnavi R, Berbée JF, et al. Plasma apolipoprotein CI and CIII levels are associated with increased plasma triglyceride levels and decreased fat mass in men with the metabolic syndrome. Diabetes Care. 2009; 32: 184-186. doi: 10.2337/dc08-1330
Bach-Ngohou K, Ouguerram K, Nazih H, et al. Apolipopro-tein E kinetics: influence of insulin resistance and type 2 diabe-tes I Apolipoprotein E kinetics: influence of insulin resistance and type 2 diabetes. Int Journal of obesity. 2002; 26(11): 1451- 1458. doi: 10.1038/sj.ijo.0802149
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