Journal of molecular and cellular cardiology · 2021
Metabolic remodeling precedes mTORC1-mediated cardiac hypertrophy.
СтатьяПоддержка NIH: внешняя программаНазвание и аннотация: Перевод в очереди
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Davogustto Giovanni E, Salazar Rebecca L, Vasquez Hernan G, Karlstaedt Anja, Dillon William P, Guthrie Patrick H, Martin Joseph R, Vitrac Heidi, De La Guardia Gina, Vela Deborah, Ribas-Latre Aleix, Baumgartner Corrine, Eckel-Mahan Kristin, Taegtmeyer Heinrich
Аннотация
RATIONALE: The nutrient sensing mechanistic target of rapamycin complex 1 (mTORC1) and its primary inhibitor, tuberin (TSC2), are cues for the development of cardiac hypertrophy. The phenotype of mTORC1 induced hypertrophy is unknown.
OBJECTIVE: To examine the impact of sustained mTORC1 activation on metabolism, function, and structure of the adult heart.
METHODS AND RESULTS: We developed a mouse model of inducible, cardiac-specific sustained mTORC1 activation (mTORC1iSA) through deletion of Tsc2. Prior to hypertrophy, rates of glucose uptake and oxidation, as well as protein and enzymatic activity of glucose 6-phosphate isomerase (GPI) were decreased, while intracellular levels of glucose 6-phosphate (G6P) were increased. Subsequently, hypertrophy developed. Transcript levels of the fetal gene program and pathways of exercise-induced hypertrophy increased, while hypertrophy did not progress to heart failure. We therefore examined the hearts of wild-type mice subjected to voluntary physical activity and observed early changes in GPI, followed by hypertrophy. Rapamycin prevented these changes in both models.
CONCLUSION: Activation of mTORC1 in the adult heart triggers the development of a non-specific form of hypertrophy which is preceded by changes in cardiac glucose metabolism.
OBJECTIVE: To examine the impact of sustained mTORC1 activation on metabolism, function, and structure of the adult heart.
METHODS AND RESULTS: We developed a mouse model of inducible, cardiac-specific sustained mTORC1 activation (mTORC1iSA) through deletion of Tsc2. Prior to hypertrophy, rates of glucose uptake and oxidation, as well as protein and enzymatic activity of glucose 6-phosphate isomerase (GPI) were decreased, while intracellular levels of glucose 6-phosphate (G6P) were increased. Subsequently, hypertrophy developed. Transcript levels of the fetal gene program and pathways of exercise-induced hypertrophy increased, while hypertrophy did not progress to heart failure. We therefore examined the hearts of wild-type mice subjected to voluntary physical activity and observed early changes in GPI, followed by hypertrophy. Rapamycin prevented these changes in both models.
CONCLUSION: Activation of mTORC1 in the adult heart triggers the development of a non-specific form of hypertrophy which is preceded by changes in cardiac glucose metabolism.
Предметные рубрики MeSH
AnimalsCardiomegalyCells, CulturedDietDisease Models, AnimalEnzyme ActivationGene Knockdown TechniquesGlucoseGlucose-6-PhosphataseIsomerasesMaleMechanistic Target of Rapamycin Complex 1MiceMice, Inbred C57BLMice, TransgenicMyocytes, CardiacOxidation-ReductionPhosphorylationSignal TransductionSirolimusTuberous Sclerosis Complex 2 Protein