Fig. 2.
ANG II induces phosphorylation of insulin receptor substrate-1 (IRS-1) at multiple serine residues. VSMCs were stimulated with 100 nM ANG II for the indicated times. Immunoprecipitation (IP) of IRS-1 followed by Western blotting with phosphospecific antibodies was performed. A: ANG II induced IRS-1 Ser632 phosphorylation maximally at 5 min (n = 3). B: ANG II induced IRS-1 Ser307 phosphorylation maximally at 30 min (n = 6). C: ANG II induced IRS-1 Ser302 phosphorylation maximally at 60 min (n = 3). Bar graphs represent means ± SE. *P < 0.05 compared with no stimulation.