Does carbon monoxide have a physiological function?

Recently endothelium-derived relaxing factor (EDRF) has been identified as nitric oxide. The source of the nitric oxide is L-arginine, and the L-arginine-nitric oxide pathway has been proposed to function as a widespread transduction mechanism for the regulation of cell function and communication. Gerald Marks and colleagues suggest that carbon monoxide, which is formed endogenously from heme catabolism and which shares some of the chemical and biological properties of nitric oxide, may play a similar role. This would be achieved by carbon monoxide binding to the iron atom of the heme moiety of soluble guanylyl cyclase and to the iron-sulfur centers of macrophage enzymes.

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