FIGURE 7.

Increased cAMP accumulation and reduced phosphodiesterase activation in CnAβ^−/− MEFs. A, the levels of cAMP in CnAβ^−/− and CnAβ^+/+ MEFs (n = 4) upon stimulation (+) or not (−) with Iso (10 μm for 5 and 15 min) were determined. The effect of the phosphodiesterase (PDE) inhibitor IBMX (0.5 mm) was also determined. B, PDE activity in CnAβ^−/− and CnAβ^+/+ MEFs (n = 3) upon stimulation (+) or not (−) with Iso (10 μm for 5 min) were determined. The effect of general PDE inhibitor IBMX (0.5 mm) was also determined. *, p < 0.05; #, p < 0.005. C, transcript levels of several PDE members in CnAβ^−/− and CnAβ^+/+ fat depots were determined by semiquantitative RT-PCR.