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pubmed-article:12086946pubmed:abstractTextType 2 diabetes is characterized by loss of beta-cell mass and concomitant deposition of amyloid derived from islet amyloid polypeptide (IAPP). Previously we have shown that expression of human IAPP (huIAPP) in islets of transgenic mice results in either a rapid onset of hyperglycemia in mice homozygous for the huIAPP transgene on a lean background (FVB/N) or a gradual hyperglycemia in mice hemizygous for the huIAPP transgene on an obese background (A(vy)/A). In both strains, only the males routinely develop diabetes. To investigate this sexual dimorphism, we treated young prediabetic A(vy)/A mice transgenic for huIAPP (huIAPP-A(vy)) with 17beta-estradiol (E2). The treatment completely blocked the progression to hyperglycemia but also prevented the associated weight gain in these mice. Immunohistochemistry of pancreatic sections demonstrated normal islet morphology with no apparent deposition of islet amyloid. E2 treatment of 1-year-old huIAPP-A(vy) diabetic males rapidly reverses obesity and hyperglycemia. To determine the effects of E2 in a nonobese model, we also treated prediabetic, ad libitum-fed and pair-fed Lean-huIAPP transgenic males. E2 completely blocked the progression to hyperglycemia with no significant effect on body weight. Pancreatic insulin content and plasma insulin concentration of Lean-huIAPP transgenic mice increased in a dose-dependent manner. We demonstrated the presence of estrogen receptor (ER)-alpha mRNA in mouse and human islets. By also confirming the presence of ER-alpha protein in islets, we discovered a novel 58-kDa ER-alpha isoform in mice and a 52-kDa isoform in humans, in the absence of the classic 67-kDa protein found in most tissues of both species. The demonstrated presence of ER-alpha in mouse and human islets is consistent with a direct effect on islet function. We conclude that exogenous E2 administered to male mice may block human IAPP-mediated beta-cell loss both by direct action on beta-cells and by decreasing insulin demand through inhibition of weight gain or increasing insulin action.lld:pubmed
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pubmed-article:12086946pubmed:dateRevised2010-11-18lld:pubmed
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pubmed-article:12086946pubmed:articleTitleEstrogen can prevent or reverse obesity and diabetes in mice expressing human islet amyloid polypeptide.lld:pubmed
pubmed-article:12086946pubmed:affiliationYale University, New Haven, CT, USA. jgeisler@isisph.comlld:pubmed
pubmed-article:12086946pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12086946pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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