Role of cyclic nucleotides in regulation of pulmonary artery tone in rabbits.
The involvement of cAMP- and cGMP-dependent signal systems into the regulation of the contractile reaction of smooth muscles of the rabbit pulmonary arteries was studied using a mechanographic method. For modulation of intracellular level of cyclic nucleotides we used adenylate cyclase activators beta-adrenoceptor agonist isadrin, guanylate cyclase inhibitor methylene blue, penetrating analog dibutyryl-cAMP, and phosphodiesterase inhibitors. The mechanisms of cAMP- and cGMP-dependent regulation of smooth muscle contractile activity were realized in close interrelationship, and the key component of this was cyclic nucleotide phosphodiesterases. The ratio of activities of phosphodiesterase subtypes in smooth-muscle cells can essentially modulate the adrenergic effects in the pulmonary artery wall and even invert them.
Kapilevich
L V
LV
Siberian State Medical University, Tomsk. kapil@yandex.ru
Nosarev
A V
AV
Kovalev
I V
IV
D'yakova
E Yu
EY
Baskakov
M B
MB
D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D000818:Animals; D000242:Cyclic AMP / Q000378:metabolism*; D006152:Cyclic GMP / Q000378:metabolism*; D004176:Dipyridamole / Q000494:pharmacology; D066298:In Vitro Techniques; D007545:Isoproterenol / Q000494:pharmacology; D009119:Muscle Contraction / Q000502:physiology*; D009129:Muscle Tonus; D009131:Muscle, Smooth, Vascular / Q000187:drug effects / Q000378:metabolism*; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology; D011651:Pulmonary Artery / Q000033:anatomy & histology / Q000378:metabolism*; D011817:Rabbits; D015398:Signal Transduction / Q000502:physiology; D013566:Sympathomimetics / Q000494:pharmacology; D013806:Theophylline / Q000494:pharmacology; D014665:Vasodilator Agents / Q000494:pharmacology
D010726:Phosphodiesterase Inhibitors; D013566:Sympathomimetics; D014665:Vasodilator Agents; D004176:Dipyridamole; D013806:Theophylline; D000242:Cyclic AMP; D006152:Cyclic GMP; D007545:Isoproterenol; D015056:1-Methyl-3-isobutylxanthine