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1 Department of Physiology, Göteborg University, S-41390 Göteborg, Sweden; 2 Department of Pharmacology, Cornell University Medical College, New York; and Departments of 3 Physiology and Biophysics and 4 Medicine, State University of New York, Stony Brook, New York 11794
The vascular effects of carbon monoxide (CO) resemble those of nitric oxide (NO), but it is unknown whether the two messengers converge or exhibit reciprocal feedback regulation. These questions were examined in microdissected perfused renal resistance arteries (RRA) studied using NO-sensitive microelectrodes. Perfusion of RRA with buffers containing increasing concentrations of CO resulted in a biphasic release of NO. The NO response peaked at 100 nM CO and then declined to virtually zero at 10 µM. When a series of 50-s pulses of 100 nM CO were applied repeatedly (150-s interval), the amplitude of consecutive NO responses was diminished. NO release from RRA showed dependence on L-arginine but not D-arginine, and the responses to CO were inhibited by pretreatment with NG-nitro-L-arginine methyl ester (L-NAME), an inhibitor of NO synthases (NOS). CO (100 nM) also suppressed NO release induced by 100 µM carbachol, a potent agonist for endothelial NOS (eNOS). RRA from rats in which endogenous CO production from inducible HO was elevated (cobalt chloride 12 h prior to study) also showed suppressed responses to carbachol. Furthermore, responses consistent with these findings were obtained in juxtamedullary afferent arterioles perfused in vitro, where the vasodilatory response to CO was biphasic and the response to acetylcholine was blunted. Collectively, these data suggest that the CO-induced NO release could be attributed to either stimulation of eNOS or to NO displacement from a cellular storage pool. To address this, direct in vitro measurements with an NO-selective electrode of NO production by recombinant eNOS revealed that CO dose-dependently inhibits NO synthesis. Together, the above data demonstrate that, whereas high levels of CO inhibit NOS activity and NO generation, lower concentrations of CO induce release of NO from a large intracellular pool and, therefore, may mimic the vascular effects of NO.
kidney; blood vessels; endothelium; heme oxygenase; hemodynamics
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