Figure 5

Modulation of p38 phosphorylation in response to SSTR2/SSTR3 activation. Cotransfected cells were treated with SST (1, 50 nM and 1 μM), L-779976 (10 and 100 nM) and L-796778 (25 and 50 nM) for 30 min (top panel) or 24 h (bottom panel) in the presence or absence of FBS, and processed for total and p-p38 using Western blot analysis. p38 phosphorylation increased upon treatment with SST and receptor-specific agonists for 30 min. In serum-deprived conditions, SST significantly increased p38 activation, whereas the effects of independent receptor activation were comparable to control. Prolonged treatment with SST and receptor-specific agonists significantly increased p-p38 levels, whereas in serum-deficient conditions, no significant changes were observed between treatment and control. Histograms represent the densitometric analysis and the results are presented as the ratio of phospho- and total-p38 (top panel) or phospho-p38 and β-Tubulin (bottom panel) expressed as fold over control. Mean ± S.D is representative of three independent experiments.