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Cardiovascular Research 2005 67(2):208-215; doi:10.1016/j.cardiores.2005.04.015
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Copyright © 2005, European Society of Cardiology

Functional evidence that in the cardiovascular system AT1 angiotensin II receptors are AT1B prejunctionally and AT1A postjunctionally

Serafim Guimarãesa,* and Helder Pinheirob

aInstitute of Pharmacology and Therapeutics, Faculty of Medicine, Alameda Hernani Monteiro, 4200-319 Porto, Portugal
bLaboratory of Pharmacology, Faculty of Pharmacy, Rua Anibal Cunha, 136, 4050 Porto, Portugal

* Corresponding author. Tel.: +351 22 5519144; fax: +351 22 5502402. Email address: sguimara{at}med.up.pt

Numerous studies have shown that angiotensin II causes vasoconstriction both by a direct action on smooth muscle cells (postjunctional effect) and indirectly through the facilitation of noradrenaline release from postganglionic sympathetic neurons (prejunctional effect). The receptors through which angiotensin II exerts its actions were first divided into AT1 and AT2 subtypes. A further subdivision of AT1 receptors into AT1A and AT1B subtypes was based on cloning and receptor binding studies: AT1A showed a high affinity for losartan, but low affinity for PD123319, while AT1B receptors showed nearly 100-fold lower affinity for losartan and 10,000-fold higher affinity for PD123319 relative to AT1 sites.

The present review deals with functional evidence supporting the existence of AT1A and AT1B subtypes in the cardiovascular system. Taken together, all the functional results obtained in vivo and in vitro–in a wide variety of vascular tissues from different species–allow one to conclude that angiotensin II AT1 receptors are different pre- and postjunctionally and also that prejunctional and postjunctional angiotensin II receptors most probably belong to AT1B and AT1A subtypes, respectively.

KEYWORDS Angiotensin; Arteries; Blood pressure; Receptors; Angiostensin system

Time for primary review 20 days


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