2026-04-17T19:27:19Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1350252025-12-05T09:25:06Zcom_2072_1057col_2072_478799col_2072_478916col_2072_478917

00925njm 22002777a 4500 dc Gómez Valadés, Alicia G. author Méndez-Lucas, Andrés author Vidal Alabró, Anna author Blasco, Francesc author Chillón, Miguel author Bartrons Bach, Ramon author Bermúdez i Mas, Jordi author Perales Losa, Carlos author 2019-06-13T15:34:40Z 2019-06-13T15:34:40Z 2008-08 2019-06-13T15:34:40Z Objective: cytosolic phosphoenolpyruvate carboxykinase (PEPCK-C; encoded by Pck1) catalyzes the first committed step in gluconeogenesis. Extensive evidence demonstrates a direct correlation between PEPCK-C activity and glycemia control. Therefore, we aimed to evaluate the metabolic impact and their underlying mechanisms of knocking down hepatic PEPCK-C in a type 2 diabetic model. Research design and methods: PEPCK-C gene targeting was achieved using adenovirus-transduced RNAi. The study assessed several clinical symptoms of diabetes and insulin signaling in peripheral tissues, in addition to changes in gene expression, protein, and metabolites in the liver. Liver bioenergetics was also evaluated. Results: treatment resulted in reduced PEPCK-C mRNA and protein. After treatment, improved glycemia and insulinemia, lower triglyceride, and higher total and HDL cholesterol were measured. Unsterified fatty acid accumulation was observed in the liver, in the absence of de novo lipogenesis. Despite hepatic lipidosis, treatment resulted in improved insulin signaling in the liver, muscle, and adipose tissue. O(2) consumption measurements in isolated hepatocytes demonstrated unaltered mitochondrial function and a consequent increased cellular energy charge. Key regulatory factors (FOXO1, hepatocyte nuclear factor-4alpha, and peroxisome proliferator-activated receptor-gamma coactivator [PGC]-1alpha) and enzymes (G6Pase) implicated in gluconeogenesis were downregulated after treatment. Finally, the levels of Sirt1, a redox-state sensor that modulates gluconeogenesis through PGC-1alpha, were diminished. Conclusions: our observations indicate that silencing PEPCK-C has direct impact on glycemia control and energy metabolism and provides new insights into the potential significance of the enzyme as a therapeutic target for the treatment of diabetes. Diabetis Patologia Genètica Resistència a la insulina Fetge Metabolisme Diabetes Pathology Genetics Insulin resistance Liver Metabolism Pck1 gene silencing in the liver improves glycemia control, insulin sensitivity and dyslipidemia in db/db mice