Fructose and glucose can regulate mammalian target of rapamycin complex 1 and lipogenic gene expression via distinct pathways.

Fiche publication

Date publication

février 2018

Journal

The Journal of biological chemistry

Auteurs

Membres identifiés du Cancéropôle Est :
Pr MASSON David

Tous les auteurs :
Hu Y, Semova I, Sun X, Kang H, Chahar S, Hollenberg AN, Masson D, Hirschey MD, Miao J, Biddinger SB

Lien Pubmed

https://www.ncbi.nlm.nih.gov/pubmed/29222328

Résumé

Although calorically equivalent to glucose, fructose appears to be more lipogenic, promoting dyslipidemia, fatty liver disease, cardiovascular disease, and diabetes. To better understand how fructose induces lipogenesis, we compared the effects of fructose and glucose on mammalian target of rapamycin complex 1 (mTORC1), which appeared to have both positive and negative effects on lipogenic gene expression. We found that fructose acutely and transiently suppressed mTORC1 signaling and The constitutive activation of mTORC1 reduced hepatic lipogenic gene expression and produced hypotriglyceridemia after 1 week of fructose feeding. In contrast, glucose did not suppress mTORC1, and the constitutive activation of mTORC1 failed to suppress plasma triglycerides after 1 week of glucose feeding. Thus, these data reveal fundamental differences in the signaling pathways used by fructose and glucose to regulate lipid metabolism.