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• W2079041103 abstract "Endocardial cells, like endothelial cells, release nitric oxide (NO) and may play a role in modulating the contractility of cardiac muscle. We have studied the effects of NG-nitro-L-arginine methyl ester (L-NAME), a selective NO synthase inhibitor, on basal and volume expansion-induced secretion of two cardiac hormones, atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP), in vivo. In conscious chronically cannulated rats, bolus injection of L-NAME at doses of 1, 3, and 10 mg/kg, iv, caused a dose-dependent increase in mean arterial pressure and sustained bradycardia, whereas right atrial pressure remained unchanged. The hemodynamic effects of L-NAME were reversed by simultaneous administration of L-arginine, a precursor of NO. Administration of 3 and 10 mg/kg L-NAME alone increased plasma levels of immunoreactive ANP (IR-ANP) from 30 +/- 5 to 52 +/- 9 pmol/liter and from 38 +/- 6 to 91 +/- 16 pmol/liter (P < 0.01), respectively, but had no effect on plasma levels of immunoreactive BNP (IR-BNP). The increase in plasma IR-ANP concentration in response to L-NAME infusions showed a positive linear correlation (P < 0.01) with the increase in mean arterial pressure and a negative correlation (P < 0.01) with the changes in heart rate. Acute volume expansion with 0.9% saline in conscious animals resulted in a 3.2-fold increase in plasma IR-ANP levels (from 35 +/- 7 to 113 +/- 15 pmol/liter; P < 0.01), but plasma IR-BNP levels did not change. In the rats pretreated with L-NAME, the relation between the changes from control in plasma IR-ANP and right atrial pressure shifted to the left; the absolute increases corresponding to the 3 mm Hg increase in right atrial pressure were 66 +/- 13, 76 +/- 15, 135 +/- 33, and 148 +/- 24 pmol/liter in the control and 1 mg/kg L-NAME, 3 mg/kg L-NAME-, and 10 mg/kg L-NAME-treated groups, respectively. The combined infusion of L-NAME and L-arginine attenuated the L-NAME-induced increase in ANP release. Our results show that L-NAME increases basal plasma IR-ANP levels and enhances stretch-induced ANP release, suggesting that secretion of ANP in response to volume load may be modulated by the locally released nitric oxide from the endothelium. Further, acute regulation of BNP secretion in response to inhibition of nitric oxide synthase and volume load differs from that of ANP." @default.
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• W2079041103 date "1995-03-01" @default.
• W2079041103 modified "2023-10-17" @default.
• W2079041103 title "Role of nitric oxide on cardiac hormone secretion: effect of NG-nitro-L-arginine methyl ester on atrial natriuretic peptide and brain natriuretic peptide release." @default.
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• W2079041103 doi "https://doi.org/10.1210/endo.136.3.7867578" @default.
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