© 1996 American Heart Association, Inc.
Articles |
Frequency-Dependent Activation of a Constitutive Nitric Oxide Synthase and Regulation of Contractile Function in Adult Rat Ventricular Myocytes
From the Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Mass.
Correspondence to Dr Ralph A. Kelly, Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA 02115. E-mail rakelly@bics.bwh.harvard.edu.
Abstract Cardiac myocytes have recently been shown to express a constitutive Ca2+-sensitive isoform of NO synthase (NOS3), although the mechanism(s) responsible for activation of NOS3 and its physiological function remain to be determined. Since the activity of NOS3 is known to be regulated in part by the intracellular Ca2+ activity ([Ca2+]i) in endothelial cells, we determined whether increasing myocyte [Ca2+]i by uniform electric field pacing was accompanied by an increase in NOS3 activity, detected as nitrite accumulation in the medium. A higher [Ca2+]i with increasing pacing frequencies was shown to be accompanied by a time-dependent accumulation of nitrite in medium that bathed adult rat ventricular myocytes stimulated at 3 Hz. Nitrite release by paced cells was significantly attenuated by treatment with either the NO synthase inhibitor nitro-L-arginine (L-NA, 1 mmol/L) or the intracellular Ca2+ chelator BAPTA-AM (20 µmol/L). Paced myocytes also exhibited a frequency- and time-dependent increase in intracellular cGMP content that could be inhibited significantly by either L-NA or the soluble guanylate cyclase inhibitor LY83583 (5 µmol/L). To determine whether the increase in NOS3 activity with pacing affected contractile function, myocytes were sequentially paced at frequencies from 0.5 to 3 Hz. Methylene blue, L-NA, and LY83583 all increased the amplitude of shortening of myocytes paced at 3 Hz. Furthermore, a significantly greater positive inotropic response to high extracellular Ca2+ (3 mmol/L) was demonstrated by myocytes pretreated with L-NA compared with control cells. These data indicate that myocyte NOS3 activity is regulated in part by [Ca2+]i, whether induced by changes in pacing frequency or [Ca2+]o, and depresses myocyte contractile responsiveness to higher stimulation frequencies.
Key Words: nitric oxide synthase • nitric oxide • contractility • cardiac myocytes
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