Does central nitric oxide elicit pulmonary hypertension in conscious rats?

The mechanisms involved in the pathogenesis of pulmonary arterial hypertension (PAH) remain unclear. Nitric oxide (NO) centrally attenuates sympathetic outflow and, therefore, may chronically modulate pulmonary arterial pressure (PAP), especially during the development of chronic hypoxia-induced PAH. To test this hypothesis, 20 male Sprague-Dawley rats (B.W. similar to 200-320 g) were chronically implanted with a telemetric transmitter for the continuous measurement of PAP, and an osmotic pump for intracerebroventricular (i.c.v.) administration of either aCSF (control), L-NAME (150 mu g/kg/day) or the NO-donor, SIN-1 (100 mu g/kg/day). Rats spent 7 days in normoxia, and then 14 days in hypoxia (CH = 12% O(2)). In normoxia, exogenous NO elevated PAP by similar to 64%, although this increase in PAP could be prevented by isoproterenol (200 mu g/kg). PAH occurred in all rats following 14 days of hypoxia. L-NAME did not alter baseline MPAP or the physiological responses to hypoxia. Our results suggest that central NO increases MPAP, although the mechanisms involved remain to be fully elucidated. (c) 2005 Elsevier B.V. All rights reserved.