Alterations in ventricular myocyte contraction caused by C-type natriuretic peptide and nitric oxide in eNOS-/- mice.

Abstract:

:Lack of endothelial nitric oxide synthase (eNOS) may affect the sensitivity of cyclic GMP signaling through soluble guanylyl cyclase (sGC). We hypothesized that in eNOS knockout (eNOS-/-) mice, stimulation of guanylyl cyclase would have enhanced effects inhibiting cardiac contraction. We measured cell shortening and calcium transients in isolated ventricular myocytes from adult eNOS-/- and wild-type (WT) mice after stimulating particulate guanylyl cyclase (pGC) with C-type natriuretic peptide (CNP, 10(-8) and 10(-7) M) or sGC with S-nitroso-N-acetyl-penicillamine (SNAP, NO donor, 10(-6) and 10(-5) M). Although sGC activity was increased by +71% in eNOS-/-, SNAP had similar effects in the two groups (%shortening -39% control vs. -37% eNOS-/-), suggesting that the cyclic GMP pathway was desensitized in eNOS-/- myocytes. CNP had significantly smaller effects on cell contraction (%shortening -34% control vs. -14% eNOS-/-) and pGC activity was not changed in eNOS-/- myocytes. Similar effects were also produced by guanylin and carbon monoxide, stimulators of pGC and sGC. CNP's effects on Ca(2+) transients were also attenuated in eNOS-/- myocytes. SNAP did not alter Ca(2+) transients in eNOS-/- or control cells. In the eNOS-/- mice, cyclic GMP-dependent protein kinase and cyclic AMP phosphodiesterase activity were reduced. This study demonstrated that the downstream cyclic GMP pathway was attenuated in eNOS-/- mice and this was partially compensated for by increased sGC, but not pGC activity in ventricular myocytes.

journal_name

J Mol Cell Cardiol

authors

Su J,Tse J,Scholz PM,Weiss HR

doi

10.1016/j.yjmcc.2005.08.008

keywords:

subject

Has Abstract

pub_date

2005-12-01 00:00:00

pages

920-8

issue

6

eissn

0022-2828

issn

1095-8584

pii

S0022-2828(05)00263-4

journal_volume

39

pub_type

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