Primary hepatocytes were isolated from 12-week-old male WT ( Prom1+/+) and KO (Prom1-/-) mice, serum-starved for 16 hours and stimulated with isoprenaline. (I) Levels of p-PKA substrates, p-CREB, CREB, Prom1 and GAPDH after isoprenaline stimulation (10 μM) for 0, 10 or 20 minutes were determined by immunoblotting. 