Data are presented concerning the basic metabolism sites, the reaction paths crossing in them and regulatory and toxical effect of formaldehyde and nitric oxide being mediated through them. In particular, they include: glutathione-formaldehyde-dependent dehydrogenase path of S-nitrosoglutathione reduction, semi-carbaside-sensitive amino-oxidase (SSAO) and NO-synthase systems; transformation of thioproline and metallothioneines, including nitrosation reactions. Possibilities of hexamethylenetetramine synthesis in the organism as well as its metabolism in conditions of formaldehyde hyperproduction and nitrosative stress are discussed. The role of metabolism sites, common for formaldehyde and nitrogen oxide, in the mechanisms of toxical effect of these compounds and development of pathologic states is considered.
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