Long-term administration of estradiol decreases expression of hepatic lipogenic genes and improves insulin sensitivity in ob/ob mice: a possible mechanism is through direct regulation of signal transducer and activator of transcription 3

Molecular Endocrinology
H GaoK Dahlman-Wright

Abstract

In this study, we used ob/ob mice as a model to investigate the effects of long-term estradiol administration on insulin sensitivity and to explore the mechanisms that underlie the antidiabetic effects of estrogen on mouse liver. Female ob/ob mice were randomly divided into two groups and given estradiol (100 microg/kg.d) or vehicle alone for 4 wk. Estrogen administration improved glucose tolerance and insulin response to glucose in ob/ob mice. Moreover, insulin resistance and liver triglyceride levels were decreased in response to estrogen administration. Microarray analysis revealed that expression of genes involved in hepatic lipid biosynthesis was decreased in ob/ob mouse livers after estradiol treatment. Further searches for direct estrogen target genes revealed increased hepatic mRNA expression of signal transducer and activator of transcription 3 (Stat3) and several known Stat3 target genes in ob/ob livers after long-term estradiol treatment. Furthermore, Stat3 and phosphorylated Stat3 protein is induced in ob/ob mouse liver after long-term estrogen treatment. We also present data showing that Stat3 is rapidly induced by estradiol in mouse livers. This, together with data showing recruitment of ERalpha to the promoter of...Continue Reading

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