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ISSN 2522-9028 (Print)
ISSN 2522-9036 (Online)
DOI: https://doi.org/10.15407/fz

Fiziologichnyi Zhurnal

is a scientific journal issued by the

Bogomoletz Institute of Physiology
National Academy of Sciences of Ukraine

Editor-in-chief: V.F. Sagach

The journal was founded in 1955 as
1955 – 1977 "Fiziolohichnyi zhurnal" (ISSN 0015 – 3311)
1978 – 1993 "Fiziologicheskii zhurnal" (ISSN 0201 – 8489)
1994 – 2016 "Fiziolohichnyi zhurnal" (ISSN 0201 – 8489)
2017 – "Fiziolohichnyi zhurnal" (ISSN 2522-9028)

Fiziol. Zh. 2006; 52(5): 28-33


Elucidatingof the mechanisms of acetylcholine constrictor action on the portal vessels

P.I. Yanchuk, O.M. Pasichnichenko, V.I. Komarenko, T.P. Prіkhodko, V.O.Tsybenko

    Taras Shevchenko Kyiv National University, Kyiv, Ukraine



Abstract

Intraportal administration of acetylcholine (Ach) to anesthetized rats evokes endothelium depended, atropine resistant and phentholamine sensitive constriction of hepatic portal vessels. Оn the contrary to Ach action sodium nitroprussideresulted in vasodilatation in this vessel. On the isolated segment of portal vein (PV) similar results were ob- tained; at the same time the blockade of nicotinic acetylcho- linic receptors by nicotine (in high concentration), tubocurarine or tetrodotoxine diminished constrictor reactions of PV to Ach. We concluded that described vasomotor effects of Ach in the hepatic portal bed are carried out through nicotinic Ach- receptors localized on endothelial cells and (or) adrenergic neurones in the wall of portal vessels. These cells synthesize and release mediators, possibly, noradrenaline which causes constriction of portal vessels.

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