Autor(es)

Garcia-Arevalo, Marta ^{[1, 2]} ; Lorza-Gil, Estela ^[1] ; Leite, Nayara ^[1] ; Brunetto, Sergio ^{[3, 4]} ; Boschero, Antonio Carlos ^[1] ; Carneiro, Everardo Magalhaes ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Biol, Dept Struct & Funct Biol, OCRC, Campinas, SP - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Inst Biol, OCRC, BR-13083970 Campinas, SP - Brazil

^[3] Univ Estadual Campinas, UNICAMP, Med Phys Div, Biomed Engn Ctr, Campinas, SP - Brazil

^[4] Univ Estadual Campinas, UNICAMP, Nucl Med Div, Clin Hosp, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENDOCRINOLOGY AND METABOLISM; v. 9, n. 5, p. 133-146, OCT 2019.
• Citações Web of Science: 0

Resumo

Background: Protein restriction causes metabolic programming to maintain glucose homeostasis in rodents. They develop increased insulin sensitivity in peripheral tissues and reduced insulin secretion by pancreatic beta cells. Estradiol (E2) is a steroid hormone involved in the control of energy balance and glucose homeostasis. Here, we assessed the role of estrogen receptors (ERs) on glucose homeostasis in malnourished mice and the effect of E2 on insulin signaling. Methods: Post-weaned Swiss male mice were fed a low-protein (LP, 6%) or chow diet (control, 14%) for 8 weeks. The malnourished phenotype in LP mice was confirmed by different physiological parameters. Hypersensitivity to insulin was demonstrated by a higher glucose infusion in the LP group compared with the control by euglycemic-hyperinsulinemic clamp. Results: The administration of 10 mu g/kg E2 during the clamp induced a significant increase in the glucose infusion rate in the LP group compared with the control, indicating enhanced insulin sensitivity in LP mice. In addition, E2 administration increased glucose uptake by peripheral tissues. These effects were blunted in mice treated with general ER antagonists (ICI 182,780 and MPP). However, PHTTP failed to interfere with the E2 effect on insulin sensitivity. In the estradiol LP-treated mice, the activity of the insulin pathway was augmented, as demonstrated by higher AKT phosphorylation and glucose uptake by the skeletal muscle. Conclusion: Thus, we show an acute effect of E2 on insulin signaling in the skeletal muscle of protein-restricted mice. It is mediated by ER alpha, which interacts directly with phosphatidylinositol 3-kinase (PI3K), increasing the phosphorylation of AKT and consequently, glucose uptake in muscle. (AU)

• Processo FAPESP: 14/09532-8 - Análise funcional e molecular dos receptores de estrógenos em ilhotas de Langerhans e tecidos periféricos de camundongos desnutridos e seu envolvimento com o controle glicêmico
• Beneficiário: Marta García-Arévalo Provencio
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/12611-0 - Mecanismos moleculares envolvidos na disfunção e morte de células beta pancreáticas no Diabetes mellitus: estratégias para a inibição desses processos e para a recuperação da massa insular
• Beneficiário: Antonio Carlos Boschiero
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/01717-9 - Investigação dos efeitos insulinotrópicos, insulinomiméticos e endoteliais da taurina em células/tecidos submetidos à restrição in vitro de aminoácidos: uma abordagem integrada e multifocal
• Beneficiário: Everardo Magalhães Carneiro
• Modalidade de apoio: Auxílio à Pesquisa - Temático