Qingwen Zhang, Shili Song, Ruyue Jiang, Jingyi Zhang, Lixin Na
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Objectives: manganese (Mn) is closely related to type 2 diabetes mellitus and insulin resistance (IR), but the exact mechanism is unclear. This study aimed to explore the regulatory effects and mechanism of Mn on IR using hepatocyte IR model induced by high palmitate (PA), high glucose (HG) or insulin. Methods: HepG2 cells were exposed to PA (200 μM), HG (25 mM) or insulin (100 nM) respectively, alone or with 5 μM Mn for 24 hours. The expression of key proteins in insulin signaling pathway, intracellular glycogen content and glucose accumulation, reactive oxygen species (ROS) level and Mn superoxide dismutase (MnSOD) activity were detected. Results: compared with control group, the expression of phosphorylated protein kinase B (Akt), glycogen synthase kinase-3β (GSK-3β) and forkhead box O1 (FOXO1) in the three IR groups was declined, and this decrease was reversed by Mn. The reduction of intracellular glycogen content and increase in glucose accumulation in IR groups were also inhibited by Mn. Additionally, the production of ROS was increased in IR models, compared with normal control group, while Mn reduced the excessive production of ROS induced by PA, HG or insulin. However, Mn did not alter the activity of MnSOD in the three IR models. Conclusion: this study demonstrated that Mn treatment can improve IR in hepatocytes. The mechanism is probably by reducing the level of intracellular oxidative stress, enhancing the activity of Akt/GSK-3β/FOXO1 signal pathway, promoting glycogen synthesis, and inhibiting gluconeogenesis.
Palabras Clave: Insulin resistance. Type 2 diabetes. Manganese.
samuel Durán , Eloina Fernández Godoy , Elena Carrasco Piña
Ismael San Mauro-martin , Ana María Ruiz-león , María Alicia Camina-martín , Elena Garicano-vilar , Luis Collado-yurrita , Beatriz De Mateo-silleras , María De Paz Redondo Del Río
Marta Milla-tobarra , Antonio García-hermoso , Noelia Lahoz-garcía , Blanca Notario-pacheco , Lidia Lucas-de La Cruz , Diana P. Pozuelo-carrascosa , María José García-meseguer , Vicente Martínez-vizcaíno
Larissa Pessoa Vila Nova , Cristiane Maria Araújo Tavares De Sá , Maria Cleide Freire Clementino Da Silva , Marinaldo Freire Lustosa , Rafael Augusto Batista De Medeiros , Daniel Calado Brito , Maria Goretti Pessoa de Araújo Burgos
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David Pacheco , Olatz Izaola , David Primo Martín , Daniel de Luis Román
Daniel de Luis Román , David Primo Martín , Olatz Izaola Jáuregui
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Lubia Velázquez-López , Xochitl Ponce-Martínez , Eloísa Colín-Ramírez , Abril Violeta Muñoz-Torres , Jorge Escobedo-de la Peña
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Mariela Vega-Cárdenas , Jorge Flores-Sánchez , María Lucina Torres-Rodriguez , Omar Sánchez-Armáss Capello , Juan Manuel Vargas-Morales , Patricia Elizabeth Cossío-Torres , Margarita Terán-García , Celia Aradillas-García
Michel Alberto Garat Escudero , Ángel Roco-Videla
Yi Wu , Jie Tang , Dan Chen , Yujia Zou , Pingping Yu , Huini Xu , Shuwen Cai , Yanni Ren , Ying Mei , Lihong Mu
Yujia Zou , Jie Tang , Fan Zhang , Dan Chen , Lisha Mu , Huini Xu , Pingping Yu , Yanni Ren , Ying Mei , Lihong Mu
José Antonio Palma-Jacinto , Isela Santiago-Roque , María del Rocío Coutiño-Rodríguez , Omar Elind Arroyo-Helguera
Maria Lucia Baraquet , Evangelina Rivarola , Nilda Raquel Perovic
María Dolores Salas-González , Viviana Loria-Kohen , Ana Isabel Jiménez-Ortega , Ana M. López-Sobaler
Antecedentes y objetivo: la endometriosis es un tr...