title: The Rab4 effector Rabip4 plays a role in the endocytotic trafficking of Glut 4 in 3T3-L1 adipocytes.
abstract: Insulin regulates glucose uptake in the adipocytes by modulating Glut 4 localization, a traffic pathway involving the endocytic small GTPases Rab4, Rab5, and RabThe expression of the Rab4 effector Rabip4 leads to a 30% increase in glucose uptake and Glut 4 translocation in the presence of insulin, without modifications in the basal condition. This effect was not due to modifications of Glut 4 expression or insulin signaling, suggesting that Rabip4 controls Glut 4 trafficking. We present evidence that Rabip4 defines a subdomain of early endosomes and that Rabip4 is redistributed to the plasma membrane by insulin. Rabip4 is mostly absent from structures positive for early endosome antigen 1, Rab11 or transferrin receptors and from Glut 4 sequestration compartments. However, Rabip4 vesicles can be reached by internalized transferrin and Glut 4. Thus, Rabip4 probably defines an endocytic sorting platform for Glut 4 towards its sequestration pool. The expression of a form of Rabip4 unable to bind Rab4 does not modify basal and insulin-induced glucose transport. However, it induces an increase in the amount of Glut 4 at the plasma membrane and perturbs Glut 4 traffic from endosomes towards its sequestration compartments. These observations suggest that the uncoupling between Rabip4 and Rab4 induces the insertion of Glut 4 molecules that are unable to transport glucose into the plasma membrane.
authors.affiliation: INSERM U568, 06107 Nice, France.
authors.forename: Muriel
authors.initials: M
authors.lastname: Mari
authors.forename: Pascale
authors.initials: P
authors.lastname: Monzo
authors.forename: Vincent
authors.initials: V
authors.lastname: Kaddai
authors.forename: Frédérique
authors.initials: F
authors.lastname: Keslair
authors.forename: Teresa
authors.initials: T
authors.lastname: Gonzalez
authors.forename: Yannick
authors.initials: Y
authors.lastname: Le Marchand-Brustel
authors.forename: Mireille
authors.initials: M
authors.lastname: Cormont
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000378:metabolism*; D000818:Animals; D002451:Cell Compartmentation / Q000187:drug effects; D018929:Cell Culture Techniques; D004705:Endocytosis; D016650:Fluorescein-5-isothiocyanate; D005456:Fluorescent Dyes; D051275:Glucose Transporter Type 4 / Q000378:metabolism*; D049452:Green Fluorescent Proteins / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D051379:Mice; D018613:Microscopy, Confocal; D008954:Models, Biological; D009154:Mutation; D013347:Subcellular Fractions / Q000378:metabolism; D014168:Transferrin / Q000378:metabolism; D020695:rab4 GTP-Binding Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D005456:Fluorescent Dyes; D051275:Glucose Transporter Type 4; D014168:Transferrin; D049452:Green Fluorescent Proteins; D020695:rab4 GTP-Binding Proteins; D016650:Fluorescein-5-isothiocyanate