Physicochemistry of dinitrosyl iron complexes with thiolate ligands underlying their beneficial effect in endometriosis

Exogenous dinitrosyl iron complexes (DNIC) with thiolate ligands as NO and NO+ donors are capable of exerting both regulatory and cytotoxic effects on diverse biological processes similarly to those characteristic of endogenous nitric oxide. Regulatory activity of DNIC (vasodilatory, hypotensive, suppressing thrombosis, increasing erythrocyte elasticity, accelerating skin wound healing, inducing penile erection, etc.) is determined by their capacity of NO and NO+ transfer to biological targets of the latter (heme- and thiol-containing proteins, respectively) due to higher affinity of the proteins for NO and NO+ than that of DNIC. Cytotoxic activity of DNIC is provided by rapid DNIC decomposition under action of iron-chelating compounds, resulting in appearance of NO and NO+ in cells and tissues in high amounts. The latter mechanism is suggested to cause the blocking effect of DNIC as cytotoxic effectors on the development of benign endometrial tumors in rats with experimental endometriosis. It is also proposed that a similar mechanism can operate to cause at least a delay of malignant tumor proliferation under action of DNIC. Similar content being viewed by others

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