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• W2115860672 abstract "Background & AimsObesity-related insulin resistance contributes to cardiovascular disease. Cannabinoid receptor-1 (CB1) blockade improves insulin sensitivity in obese animals and people, suggesting endocannabinoid involvement. We explored the role of hepatic CB1 in insulin resistance and inhibition of insulin signaling pathways.MethodsWild-type mice and mice with disruption of CB1 (CB1−/− mice) or with hepatocyte-specific deletion or transgenic overexpression of CB1 were maintained on regular chow or a high-fat diet (HFD) to induce obesity and insulin resistance. Hyperinsulinemic-euglycemic clamp analysis was used to analyze the role of the liver and hepatic CB1 in HFD-induced insulin resistance. The cellular mechanisms of insulin resistance were analyzed in mouse and human isolated hepatocytes using small interfering or short hairpin RNAs and lentiviral knockdown of gene expression.ResultsThe HFD induced hepatic insulin resistance in wild-type mice, but not in CB1−/− mice or mice with hepatocyte-specific deletion of CB1. CB1−/− mice that overexpressed CB1 specifically in hepatocytes became hyperinsulinemic as a result of reduced insulin clearance due to down-regulation of the insulin-degrading enzyme. However, they had increased hepatic glucose production due to increased glycogenolysis, indicating hepatic insulin resistance; this was further increased by the HFD. In mice with hepatocytes that express CB1, the HFD or CB1 activation induced the endoplasmic reticulum stress response via activation of the Bip-PERK-eIF2α protein translation pathway. In hepatocytes isolated from human or mouse liver, CB1 activation caused endoplasmic reticulum stress-dependent suppression of insulin-induced phosphorylation of akt-2 via phosphorylation of IRS1 at serine-307 and by inducing the expression of the serine and threonine phosphatase Phlpp1. Expression of CB1 was up-regulated in samples from patients with nonalcoholic fatty liver disease.ConclusionsEndocannabinoids contribute to diet-induced insulin resistance in mice via hepatic CB1-mediated inhibition of insulin signaling and clearance. Obesity-related insulin resistance contributes to cardiovascular disease. Cannabinoid receptor-1 (CB1) blockade improves insulin sensitivity in obese animals and people, suggesting endocannabinoid involvement. We explored the role of hepatic CB1 in insulin resistance and inhibition of insulin signaling pathways. Wild-type mice and mice with disruption of CB1 (CB1−/− mice) or with hepatocyte-specific deletion or transgenic overexpression of CB1 were maintained on regular chow or a high-fat diet (HFD) to induce obesity and insulin resistance. Hyperinsulinemic-euglycemic clamp analysis was used to analyze the role of the liver and hepatic CB1 in HFD-induced insulin resistance. The cellular mechanisms of insulin resistance were analyzed in mouse and human isolated hepatocytes using small interfering or short hairpin RNAs and lentiviral knockdown of gene expression. The HFD induced hepatic insulin resistance in wild-type mice, but not in CB1−/− mice or mice with hepatocyte-specific deletion of CB1. CB1−/− mice that overexpressed CB1 specifically in hepatocytes became hyperinsulinemic as a result of reduced insulin clearance due to down-regulation of the insulin-degrading enzyme. However, they had increased hepatic glucose production due to increased glycogenolysis, indicating hepatic insulin resistance; this was further increased by the HFD. In mice with hepatocytes that express CB1, the HFD or CB1 activation induced the endoplasmic reticulum stress response via activation of the Bip-PERK-eIF2α protein translation pathway. In hepatocytes isolated from human or mouse liver, CB1 activation caused endoplasmic reticulum stress-dependent suppression of insulin-induced phosphorylation of akt-2 via phosphorylation of IRS1 at serine-307 and by inducing the expression of the serine and threonine phosphatase Phlpp1. Expression of CB1 was up-regulated in samples from patients with nonalcoholic fatty liver disease. Endocannabinoids contribute to diet-induced insulin resistance in mice via hepatic CB1-mediated inhibition of insulin signaling and clearance." @default.
• W2115860672 created "2016-06-24" @default.
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• W2115860672 date "2012-05-01" @default.
• W2115860672 modified "2023-10-18" @default.
• W2115860672 title "Hepatic Cannabinoid Receptor-1 Mediates Diet-Induced Insulin Resistance via Inhibition of Insulin Signaling and Clearance in Mice" @default.
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• W2115860672 doi "https://doi.org/10.1053/j.gastro.2012.01.032" @default.
• W2115860672 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3482511" @default.
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