Modulation of hypothalamic S6K1 and S6K2 alters feeding behavior and systemic glucose metabolism

TAVARES, MARIANA ROSOLEN; LEMES, SIMONE FERREIRA; DE FANTE, THAIS; DE MIERA, CRISTINA SAENZ; BETIM PAVAN, ISADORA CAROLINA; NEVES BEZERRA, ROSANGELA MARIA; PRADA, PATRICIA OLIVEIRA; TORSONI, MARCIO ALBERTO; ELIAS, CAROL FUZETI; SIMABUCO, FERNANDO MOREIRA

JOURNAL OF ENDOCRINOLOGY

BIOSCIENTIFICA LTD

Año: 2020 vol. 244 p. 71 - 82

0022-0795

The mTOR/S6Ks signaling is one of the intracellular pathways important for metabolic control, acting both peripherally and centrally. In the hypothalamus, mTOR/S6Ks axis mediates the action of leptin and insulin and can modulate the expression of neuropeptides. We analyzed the role of different S6Ks isoforms in the hypothalamic regulation of metabolism. We observed decreased food intake and decreased expression of agouti-related peptide (AgRP) following intracerebroventricular (icv) injections of adenoviral-mediated overexpression of three different S6Ks isoforms. Moreover, mice overexpressing p70-S6K1 in undefined periventricular hypothalamic neurons presented changes in glucose metabolism, as an increase in gluconeogenesis. To further evaluate the hypothalamic role of a less-studied S6K isoform, p54-S6K2, we used a Cre-LoxP approach to specifically overexpress it in AgRP neurons. Our findings demonstrate the potential participation of S6K2 in AgRP neurons regulating feeding behavior.