Impaired estrogen action is associated with the metabolic syndrome in humans. We sought to determine whether impaired estrogen action in female C57Bl6 mice, produced by whole body Esr1 ablation, could recapitulate aspects of this syndrome, including inflammation, insulin resistance, and obesity. Indeed, we found that global knockout (KO) of the estrogen receptor (ER)α leads to reduced oxygen uptake and caloric expenditure compared with wild-type (WT) mice. In addition, fasting insulin, leptin, and PAI-1 levels were markedly elevated, whereas adiponectin levels were reduced in normal chow-fed KO. Furthermore, ERα-KO mice exhibited impaired glucose tolerance and marked skeletal muscle insulin resistance that was accompanied by the accumulation of bioactive lipid intermediates, inflammation, and diminished PPARα, PPARδ, and UCP2 transcript levels. Although the relative glucose intolerance and insulin resistance phenotype in KO mice became more severe with high-fat feeding, WT mice were refractory to these dietary-induced effects, and this protection coincided with a marked increase in circulating adiponectin and heat shock protein 72 levels in muscle, liver, and fat. These data indicate that ERα is critical for the maintenance of whole body insulin action and protection against tissue inflammation during both normal chow and high-fat feeding.

Item Type:	Refereed Article
Keywords:	estrogen receptor-α, estrogen action, fatty acid metabolism, insulin action
Research Division:	Biological Sciences
Research Group:	Biochemistry and cell biology
Research Field:	Cell metabolism
Objective Division:	Health
Objective Group:	Clinical health
Objective Field:	Clinical health not elsewhere classified
UTAS Author:	Henstridge, DC (Mr Darren Henstridge)
ID Code:	133327
Year Published:	2010
Web of Science® Times Cited:	169
Deposited By:	Health Sciences
Deposited On:	2019-06-24
Last Modified:	2019-07-31
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