The production of carbon monoxide from hemoglobin in vivo

The Journal of Clinical Investigation
R F CoburnS B Kahn

Abstract

Dogs anesthetized with pentobarbital were shown to produce carbon monoxide at an average rate of 0.21 +/- (SD) 0.05 ml per hour. After intravenous injection of erythrocytes damaged by incubation with N-ethylmaleimide, CO was produced in excess of base-line production for 3 to 4 hours with an average yield of 0.89 +/- (SE) 0.046 mumole of carbon monoxide to 1 mumole of heme degraded. After intravenous injection of N-ethylmaleimide (NEM)-treated erythrocytes containing hemoglobin labeled with (14)carbon, (14)CO was produced. Its specific activity was approximately one-eighth that of the injected heme. It was also produced after intravenous injection of solutions of hemoglobin-(14)C and of reconstituted methemoglobin containing hemin-(14)C, but not after injections of methemoglobin containing globin-(14)C. The average yields of (14)CO from metabolized heme in the experiments with damaged erythrocytes and hemoglobin solutions were 89 +/- (SE) 4.6 and 97 +/- (SE) 17.0%, respectively. These results demonstrate that the CO produced during hemoglobin degradation arises from the heme moiety. The yield of (14)CO after injection of hemoglobin-(14)C solutions decreased significantly to values of 35 and 42% in two experiments when exogenous...Continue Reading

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