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Congestive heart failure alters receptor-dependent cAMP-mediated relaxation of canine pulmonary arteries.

Abstract：

BACKGROUND:Alterations in myocardial function and systemic vascular tone are well documented in congestive heart failure (CHF), but little information is available on the effects of CHF on pulmonary vessels. We examined the mechanisms of tone regulation of canine pulmonary arteries during pacing-induced CHF. METHODS AND RESULTS:Rings 3-4 mm wide from lobar pulmonary arteries were prepared from normal dogs, dogs paced at 210 beats per minute for 3 weeks (paced group, nonfailure), and dogs also paced at 240 beats per minute during the fourth week to induce severe heart failure (CHF group). Contractile responses to 60 mmol/L KCl and phenylephrine and relaxation responses to acetylcholine, bradykinin (endothelium-dependent cyclic GMP [cGMP]-mediated), isoproterenol, arachidonic acid, prostacyclin (receptor-dependent cyclic AMP [cAMP]-mediated), forskolin (direct stimulator of adenylate cyclase), a forskolin analogue (devoid of adenylate cyclase-dependent activity), and RO 20-1724 (phosphodiesterase inhibitor) were characterized. The paced group did not show alterations in vascular reactivity. Contractile response to phenylephrine and cGMP-mediated relaxation responses were not altered in the CHF group; however, receptor-mediated cAMP-induced relaxation responses were significantly inhibited (p < 0.05). Relaxation responses to isoproterenol (10(-6) mol/L), arachidonic acid (10(-5) mol/L), and prostacyclin (10(-5) mol/L) were reduced by 56%, 72%, and 74%, respectively. The relaxation response to RO 20-1724 was not affected by CHF, and this probe did not enhance the impaired relaxation response to isoproterenol. Forskolin-induced relaxation was not altered, and the forskolin analogue produced minimal relaxation compared with forskolin. CONCLUSIONS:These findings suggest that in pacing-induced CHF, canine pulmonary arteries show a selective defect in receptor coupling to cAMP-dependent relaxation mechanisms. There is no evidence of enhanced degradation of cAMP.

journal_name

Circulation

journal_title

Circulation

authors

Mathew R,Wang J,Gewitz MH,Hintze TH,Wolin MS

doi

10.1161/01.cir.87.5.1722

subject

Has Abstract

pub_date

1993-05-01 00:00:00

pages

1722-8

issue

5

eissn

0009-7322

issn

1524-4539

journal_volume

87

pub_type

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