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Vanadate fully stimulates insulin receptor substrate-1 associated phosphatidyl inositol 3-kinase activity in adipocytes from young and old rats

journal contribution
posted on 1998-03-27, 00:00 authored by Juan Molero Navajas, C Martínez, A Andrés, J Satrústegui, J M Carrascosa
Vanadate stimulates adipocyte 2-deoxyglucose transport and GLUT-4 translocation to the membrane through an insulin receptor-independent but wortmannin-inhibitable pathway. Vanadate stimulates PI 3-kinase in anti-IRS-1 immunoprecipitates and the binding between IRS-1 and the p85alpha subunit of PI 3-kinase. In insulin-resistant adipocytes from old rats vanadate fully stimulates IRS-1-associated PI 3-kinase, but partially activates glucose uptake. We conclude that: (a) vanadate stimulates 2-deoxyglucose uptake using a pathway that converges with that of insulin at the level of PI 3-kinase; and (b) adipocytes from old rats are defective in the insulin pathway at steps located both upstream and downstream of PI 3-kinase.

History

Journal

FEBS Letters

Volume

425

Issue

2

Pagination

298 - 304

Publisher

FEBS Press

Location

London, Eng.

ISSN

0014-5793

Language

eng

Publication classification

CN.1 Other journal article