Increased dilator response to heptanol and octanol in aorta from DOCA-salt-hypertensive rats.

Abstract:

:This study tests the hypothesis that contractile responses in aortae of hypertensive rats are more dependent on gap junctional communication compared to those from normotensive rats. The experimental approach was pharmacological, using inhibitors of gap junctional activity (heptanol and octanol). Two models of experimental hypertension were characterized: (1) mineralocorticoid (DOCA)-hypertensive rats and (2) stroke-prone spontaneous hypertensive rats (SHRSP). Vessels from DOCA-hypertensive rats showed a greater relaxation to heptanol and octanol, particularly when precontracted with phenylephrine, compared to sham-operated animals. Octanol-induced relaxation in aortic segments from SHRSP did not differ from normotensive values regardless of the agonist used to cause contraction. These results suggest that in DOCA hypertension, gap junctional communication and voltage-operated calcium channels are differentially regulated, which could explain in part the changes in vascular reactivity observed in mineralocorticoid hypertension.

journal_name

Pharmacology

journal_title

Pharmacology

authors

Leite R,Webb RC

doi

10.1159/000056069

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

29-35

issue

1

eissn

0031-7012

issn

1423-0313

pii

56069

journal_volume

62

pub_type

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