Alexandre Guillot, Kevin Toussaint, Lucrece Ebersold, Hassan ElBtaouri, Emilie Thiebault, Tarik Issad, Franck Peiretti, Pascal Maurice, Hervé Sartelet, Amar Bennasroune, Laurent Martiny, Manuel Dauchez, Laurent Duca, Vincent Durlach, Béatrice Romier, Stéphanie Baud, Sébastien Blaise
The insulin receptor (IR) plays an important role in insulin signal transduction, the defect of which is believed to be the root cause of type 2 diabetes. In 3T3-L1 adipocytes as in other cell types, the mature IR is a heterotetrameric cell surface glycoprotein composed of two α subunits and two β subunits. Our objective in our study, is to understand how the desialylation of N-glycan chains, induced by elastin-derived peptides, plays a major role in the function of the IR. Using the 3T3-L1 adipocyte line, we show that removal of the sialic acid from N-glycan chains (N893 and N908), induced by the elastin receptor complex (ERC) and elastin derived-peptides (EDPs), leads to a decrease in the autophosphorylation activity of the insulin receptor...
February 23, 2024: Journal of Physiology and Biochemistry