0000000000349046
AUTHOR
B Simon
Histamine-sensitive adenylate cyclase of human gastric mucosa: a model for H2-receptor excitation.
Recent studies revealed that human gastric mucosa contains a histamine-sensitive adenylate cyclase which is almost completely localized within the acid-secreting area of the stomach. In an attempt to further characterize the effector system of histamine’s action, we compared the effects of H 1 — and H 2-receptor agonists upon the adenylate cyclase in human fundic gastric mucosa.
Functional, biochemical and molecular biological evidence for a possible β3-adrenoceptor in human near-term myometrium
The possible existence of a β3-adrenoceptor (β3-AR) in human near-term myometrium was investigated by in vitro functional and biochemical studies and analysis of mRNA expression. SR 59119A and SR 59104A and CGP 12177 (two selective agonists and a partial agonist, respectively, of the β3-AR), salbutamol and terbutaline (β2-AR agonists) each produced a concentration-dependent relaxation of the myometrial spontaneous contractions. There were no differences in pD2 values for the relaxing potencies of terbutaline, salbutamol, CGP 12177 and SR 59119A. The rank order for their relaxing efficacies was SR 59119A>SR 59104A>terbutaline∼salbutamol∼CGP 12177 (Emax=52±7%, 42±12% and ∼ 30% respectively). …