Cyclic AMP Generation in Medulla Oblongata and Hypothalamus of Hypertension‐Prone and ‐Resistant Rats

Abstract: Accumulation of cAMP induced by noradrenaline (NA) was higher in the medulla oblongata (MO) of hypertension‐prone (H) than in resistant (N) rats, 113 ± 3 vs. 72 ± 4 (p < 0.01). In the hypothalamus (HYP) it was higher in N than in H rats, 148 ± 8 vs. 92 ± 6 (p < 0.01). In both anterior and posterior HYP, the accumulation of cAMP was significantly higher in N than in H rats. cAMP accumulation, in the presence of increasing concentrations of phosphodiesterase inhibitor, showed significant strain differences in both MO and HYP. The observed strain differences in cAMP may be pertinent to the disparate susceptibility to hypertension of H and N rats.