ملخص
This study examined if the nitric oxide (NO)/L-arginine pathway participates in and if the sympathetic nervous system attenuates the depressor action of human urotensin II. I.V. bolus injections of human urotensin II (0.1-30 nmol/kg) caused dose-dependent decreases in mean arterial pressure (MAP, EC50 = 2.09 ± 0.8 nmol/kg; Emax = -18 ± 3 mmHg ) and increases in heart rate. The depressor response to human urotensin II (3 nmol/kg) was attenuated by approximately 50% in rats with MAP elevated through pretreatment with NG-nitro-L-arginine methyl ester (inhibitor of NO synthase), relative to that in rats with MAP elevated to a similar level through a continuous infusion of noradrenaline. Autonomic blockade with i.v. injections of mecamylamine (ganglion blocker) and propranolol (β-adrenoceptor antagonist) markedly augmented the depressor response to human urotensin II, but almost completely attenuated the tachycardia. The results suggest that the depressor response to human urotensin II is partially mediated via the NO/L-arginine pathway, and is suppressed by activity of the sympathetic nervous system. Furthermore, tachycardic response to human urotensin II is primarily mediated indirectly via baroreflex mechanisms.
اللغة الأصلية | English |
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الصفحات (من إلى) | 819-825 |
عدد الصفحات | 7 |
دورية | Life Sciences |
مستوى الصوت | 71 |
رقم الإصدار | 7 |
المعرِّفات الرقمية للأشياء | |
حالة النشر | Published - يوليو 5 2002 |
منشور خارجيًا | نعم |
ASJC Scopus subject areas
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