707-P: Physical Exercise Decreases Notch1 Activation and Reduces the Gluconeogenesis in Liver of Obese Mice

Abstract

Notch1 protein has an important role in the hepatic metabolism. In this way, it has been observed in obese individuals that Notch1 is correlated with insulin resistance in the liver, which makes it an interesting research target. On the other hand, the physical exercise are associated with the prevention and treatment of insulin resistance and type 2 diabetes. Thus, the present study aims to verify the role of physical exercise in the Notch1 protein modulation in the hepatic tissue of obese mice and its contribution in the control of gluconeogenesis. For this, we used obese mice induced by high fat diet and ob/ob animals. The trained animals group performed treadmill-running protocol, with intensity corresponding to 70% of the maximum running speed, for a period of four weeks. At the end of the exercise protocol (24 hours later), we analyzed the physiological parameters, mRNA levels, and protein content of key molecules in the control of gluconeogenesis and Notch1 signaling. We found that exercise reversed the physiological damage generated by obesity. In addition, trained animals showed a reduction in protein content and Notch1 activity when compared to the sedentary obese group. Furthermore, we observed reduction in pyruvate intolerance in exercised animals and a decrease in gluconeogenesis enzymes. Such findings were also observed in ob/ob mice submitted to physical exercise. Thus, we verified the physical exercise mice reduce Nocth1 activation and decrease PEPCK protein content. Finally, we found that inhibition of Notch1 activity decreases pyruvate intolerance as well as reduces the protein content of gluconeogenesis enzymes. Therefore, we concluded that physical exercise is able to modulate the Notch1 pathway in the liver and contribute to the gluconeogenesis control in obese mice. Disclosure R.C. Gaspar: None. V. Muñoz: None. S.C. Nakandakari: None. B.M. Crisol: None. R.F.L. Vieira: None. L.R. Conceição: None. A. Silva: None. D.E. Cintra: None. L.P. Moura: None. E.R. Ropelle: None. J.R. Pauli: None. Funding São Paulo Research Foundation (2019/11338-9, 2017/20542-3)