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J. Biol. Chem., Vol. 275, Issue 33, 25494-25501, August 18, 2000
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From the Insulin and insulin-like growth factor I
signals are mediated via phosphorylation of a family of insulin
receptor substrate (IRS) proteins, which may serve both complementary
and overlapping functions in the cell. To study the metabolic effects
of these proteins in more detail, we established brown adipocyte cell
lines from wild type and various IRS knockout (KO) animals and
characterized insulin action in these cells in vitro.
Preadipocytes derived from both wild type and IRS-2 KO mice could be
fully differentiated into mature brown adipocytes. In differentiated
IRS-2 KO adipocytes, insulin-induced glucose uptake was decreased by
50% compared with their wild type counterparts. This was the result of
a decrease in insulin-stimulated Glut4 translocation to the plasma
membrane. This decrease in insulin-induced glucose uptake could be
partially reconstituted in these cells by retrovirus-mediated
re-expression of IRS-2, but not overexpression of IRS-1. Insulin
signaling studies revealed a total loss of IRS-2-associated
phosphatidylinositol (PI) 3-kinase activity and a reduction in
phosphotyrosine-associated PI 3-kinase by 30% (p < 0.05) in the KO cells. The phosphorylation and activity of Akt, a major
downstream effector of PI 3-kinase, as well as
Akt-dependent phosphorylation of glycogen synthase kinase-3
and p70S6 kinase were not affected by the lack of IRS-2; however, there
was a decrease in insulin stimulation of Akt associated with the plasma
membrane. These results provide evidence for a critical role of IRS-2
as a mediator of insulin-stimulated Glut4 translocation and glucose
uptake in adipocytes. This occurs without effects in differentiation,
total activation of Akt and its downstream effectors, but may be caused
by alterations in compartmentalization of these downstream signals.
Essential Role of Insulin Receptor Substrate-2 in
Insulin Stimulation of Glut4 Translocation and Glucose Uptake in
Brown Adipocytes*
§¶,
§
**,
,
,
,
, and
§§
Research Division, Joslin Diabetes Center,
and the Department of Medicine, Harvard Medical School, Boston,
Massachusetts 02215, the
Medical University of Lübeck,
Department of Internal Medicine I, 23538 Lübeck, Germany, and the

Facultad de Farmacia, Universidad
Complutense, 28040 Madrid, Spain
*
This work was supported in part by National Institutes of
Health Grants DK 5545, DK 33201, and DK 36836 (to the Joslin Diabetes and Endocrinology Research Center).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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