[SUPRESSION MECHANISMS OF ANGIOTENSIN II-INDUCED VASCULAR SPASM OF ISOLATED RAT PORTAL VEIN IN VITRO].

On the basis of the experimental model of angiotensin (Ang) II-induced vasoconstriction by means of the pharmacological agents with various mechanisms of vasoactive action (including verapamil, lidocaine, papaverine, atropine, phentolamine) dependence of Ang II-mediated vascular effect on the state of L-type voltage-dependent calcium channels, voltage-gated sodium channels, phosphodiesterase 3, acetylcholine muscarinic receptors, α-adrenergic receptors were investigated. As a result of the detailed studying of mechanisms of Ang II-mediated vascular effect, it was confirmed that Ang II-induced contraction of isolated rat portal vein depends on the influx of extracellular Ca 2+ through L-type voltage-dependent calcium channels, is less dependent on the phosphodiesterase 3 activity, but it's not dependent on the functional properties of voltage-gated sodium channels, acetylcholine muscarinic receptors and α-adrenergic receptors.