RESUMO
Little is known about how metabolites couple tissue-specific stem cell function with physiology. Here we show that, in the mammalian small intestine, the expression of Hmgcs2 (3-hydroxy-3-methylglutaryl-CoA synthetase 2), the gene encoding the rate-limiting enzyme in the production of ketone bodies, including beta-hydroxybutyrate (ßOHB), distinguishes self-renewing Lgr5+ stem cells (ISCs) from differentiated cell types. Hmgcs2 loss depletes ßOHB levels in Lgr5+ ISCs and skews their differentiation toward secretory cell fates, which can be rescued by exogenous ßOHB and class I histone deacetylase (HDAC) inhibitor treatment. Mechanistically, ßOHB acts by inhibiting HDACs to reinforce Notch signaling, instructing ISC self-renewal and lineage decisions. Notably, although a high-fat ketogenic diet elevates ISC function and post-injury regeneration through ßOHB-mediated Notch signaling, a glucose-supplemented diet has the opposite effects. These findings reveal how control of ßOHB-activated signaling in ISCs by diet helps to fine-tune stem cell adaptation in homeostasis and injury.
Assuntos
Dieta Hiperlipídica , Corpos Cetônicos/metabolismo , Células-Tronco/metabolismo , Ácido 3-Hidroxibutírico/sangue , Ácido 3-Hidroxibutírico/farmacologia , Idoso de 80 Anos ou mais , Animais , Diferenciação Celular/efeitos dos fármacos , Autorrenovação Celular , Feminino , Inibidores de Histona Desacetilases/farmacologia , Humanos , Hidroximetilglutaril-CoA Sintase/deficiência , Hidroximetilglutaril-CoA Sintase/genética , Hidroximetilglutaril-CoA Sintase/metabolismo , Intestinos/citologia , Intestinos/patologia , Masculino , Camundongos , Camundongos Knockout , Receptores Acoplados a Proteínas G/metabolismo , Receptores Notch/metabolismo , Transdução de Sinais/efeitos dos fármacos , Células-Tronco/citologia , Adulto JovemRESUMO
Physical exercise has positive effects on cognition, but very little is known about the inheritance of these effects to sedentary offspring and the mechanisms involved. Here, we use a patrilineal design in mice to test the transmission of effects from the same father (before or after training) and from different fathers to compare sedentary- and runner-father progenies. Behavioral, stereological, and whole-genome sequence analyses reveal that paternal cognition improvement is inherited by the offspring, along with increased adult neurogenesis, greater mitochondrial citrate synthase activity, and modulation of the adult hippocampal gene expression profile. These results demonstrate the inheritance of exercise-induced cognition enhancement through the germline, pointing to paternal physical activity as a direct factor driving offspring's brain physiology and cognitive behavior.