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Down-modulation of erbB2 activity is necessary but not enough in the differentiation of 3T3-L1 preadipocytes.

Abstract：

:The high incidence of obesity-related pathologies, led to the study of the mechanisms involved in preadipose cell proliferation and differentiation. Here, we demonstrate that modulation of erbB2, plays a fundamental role during proliferation and adipogenic induction of preadipocytes. Using 3T3-L1 cells as model, we demonstrate that EGF (10 nM, 5 min) in addition to stimulate receptor tyrosine phosphorylation of both erbB2 and EGFR, is able to induce the heterodimer erbB2-EGFR. We treated proliferating 3T3-L1 cells with two inhibitors, AG 825 (IC(50) 0.35 microM, 54 times more selective for erbB2 than for EGFR, IC(50) 19 microM), and AG 879 (IC(50) of 1 microM for erbB2 versus 500 microM for EGFR). We found that both inhibited the proliferation on a dose-dependent basis, reaching a 30% maximal inhibition at 100 microM (P < 0.001) for AG825, and a 20% maximal inhibition at 10 microM (P < 0.001) for AG 879. These results involve erbB2 in 3T3-L1 proliferation. When studying the differentiation process, we found that the action of MIX-Dexa immediately activates MEK, JNK and p38 kinases. We observed that PD98059 and SP600125 (MEK-ERK and JNK inhibitors, respectively) added 1 h prior to the MIX-Dexa induction produced a decrease in erbB2 expression after 6 h, which is even greater than the one produced by the inducers, MIX-Dexa. This work supports erbB2 as a key factor in 3T3-L1 adipogenesis, acting mostly and not only during the proliferative phase but also during the differentiation through modulation of both its expression and activity.

journal_name

J Cell Biochem

journal_title

Journal of cellular biochemistry

authors

Pagano E,Coso O,Calvo JC

doi

10.1002/jcb.21621

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

274-85

issue

1

eissn

0730-2312

issn

1097-4644

journal_volume

104

pub_type

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