Pancreatic insulin content regulation by the estrogen receptor ER alpha.
The function of pancreatic beta-cells is the synthesis and release of insulin, the main hormone involved in blood glucose homeostasis. Estrogen receptors, ER alpha and ER beta, are important molecules involved in glucose metabolism, yet their role in pancreatic beta-cell physiology is still greatly unknown. In this report we show that both ER alpha and ER beta are present in pancreatic beta-cells. Long term exposure to physiological concentrations of 17beta-estradiol (E2) increased beta-cell insulin content, insulin gene expression and insulin release, yet pancreatic beta-cell mass was unaltered. The up-regulation of pancreatic beta-cell insulin content was imitated by environmentally relevant doses of the widespread endocrine disruptor Bisphenol-A (BPA). The use of ER alpha and ER beta agonists as well as ER alphaKO and ER betaKO mice suggests that the estrogen receptor involved is ER alpha. The up-regulation of pancreatic insulin content by ER alpha activation involves ERK1/2. These data may be important to explain the actions of E2 and environmental estrogens in endocrine pancreatic function and blood glucose homeostasis.
Alonso-Magdalena
Paloma
P
Instituto de Bioingeniería, Universidad Miguel Hernández de Elche, Alicante, Spain.
Ropero
Ana B
AB
Carrera
M Pilar
MP
Cederroth
Christopher R
CR
Baquié
Mathurin
M
Gauthier
Benoit R
BR
Nef
Serge
S
Stefani
Enrico
E
Nadal
Angel
A
D000818:Animals; D001559:Benzhydryl Compounds; D020013:Calcium Signaling / Q000187:drug effects; D004958:Estradiol / Q000494:pharmacology; D047628:Estrogen Receptor alpha / Q000819:agonists / Q000378:metabolism*; D047629:Estrogen Receptor beta / Q000819:agonists; D005786:Gene Expression Regulation / Q000187:drug effects; D005947:Glucose / Q000494:pharmacology; D007328:Insulin / Q000235:genetics / Q000378:metabolism*; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D010636:Phenols / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D000098826:Bisphenol A Compounds
D001559:Benzhydryl Compounds; D004958:Estradiol; D047628:Estrogen Receptor alpha; D047629:Estrogen Receptor beta; D005947:Glucose; D007328:Insulin; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D010636:Phenols; C006780:bisphenol A; D000098826:Bisphenol A Compounds