Abstract:
:Insulin receptor substrates (IRSs) are phosphorylated by activated insulin/insulin-like growth factor (IGF)-I receptor tyrosine kinases. Phosphotyrosyl IRSs are recognized by signaling molecules possessing src homology region 2 (SH2) domains, which mediate various insulin/IGF bioactivities. However, we have shown that IRSs are also associated with other proteins by a phosphotyrosine-independent mechanism. Here, we demonstrated that IRSs form high-molecular-mass complexes (we named these complexes IRSomes) with various proteins and we elucidated their possible roles. Blue native-polyacrylamide gel electrophoresis of cell lysates revealed IRSome formation. Some proteins associated with IRSs in IRS-isoform-, cell-type-, or stimulus-specific manners. Results of the in vitro tyrosine phosphorylation assay indicated that tyrosine phosphorylation of IRS-1 by insulin receptor was decreased when IRS-1 was contained in IRSomes prepared from 3T3-L1 adipocytes treated with TNF-α. Also, tyrosine phosphorylation of IRS-2 by IGF-I receptor was increased when IRS-2 was contained in IRSomes prepared from FRTL-5 thyrocytes treated with dibutyryl cAMP. These results demonstrated that cytokine/hormone-induced formation of IRSomes modulates availability of IRSs to receptor tyrosine kinases.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Fukushima T,Arai T,Ariga-Nedachi M,Okajima H,Ooi Y,Iijima Y,Sone M,Cho Y,Ando Y,Kasahara K,Ozoe A,Yoshihara H,Chida K,Okada S,Kopchick JJ,Asano T,Hakuno F,Takahashi Sdoi
10.1016/j.bbrc.2010.12.045subject
Has Abstractpub_date
2011-01-21 00:00:00pages
767-73issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(10)02283-7journal_volume
404pub_type
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