Dinitrosyl iron complexes with glutathione largely relieve rats of experimental endometriosis

In: Biophysics · 2013 · vol. 58(2) , pp. 222–227 · doi:10.1134/s0006350913020036 · W1995670109
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Binuclear dinitrosyl iron complexes with glutathione reduced endometrioid tumor volume by over half and prevented secondary tumor formation in rats with experimental endometriosis.

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The paper studied the effects of binuclear dinitrosyl iron complexes (DNIC) with glutathione in a rat model of experimental endometriosis, created by autotransplantation of endometrium with myometrium to the abdominal wall. After 4 weeks, rats received intraperitoneal DNIC-glutathione injections daily for 12 days, and treated animals showed more than a halving of total endometrioid tumor volume, with secondary/spontaneously arising nearby tumors observed in controls but not in DNIC-treated rats. The authors detected an EPR signal characteristic of protein-bound DNIC in liver and endometriotic implants in both groups, and observed activation of ribonucleotide reductase in small tumors; they proposed that DNIC breakdown near tumors releases nitric oxide and nitrosonium ions producing selective local cytotoxicity. This paper is centrally about endometriosis — it reports DNIC-glutathione treatment effects in a rat experimental endometriosis model.

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Abstract

A study was made of the effect of binuclear dinitrosyl iron complexes (DNIC) with glutathione in rats with experimental endometriosis. The latter was induced in an autotransplantation model, where two fragments of endometrium with myometrium (2 × 2 mm) from the left uterine horn were grafted to the inner surface of the anterior abdominal wall. After 4 weeks, the test animals received i.p. injections of 0.5 mL DNIC-glutathione at a dose of 12.5 μmol/kg daily for 12 days. This treatment more than halved the total volume of endometrioid tumors. Remarkably, tumor growths from grafts in control rats were often attended by tumors spontaneously arising nearby or in other locations; no such secondary tumors were observed in DNIC-treated animals. The EPR signal with g av = 2.03 characteristic of protein-bound DNIC with thiol ligands was recorded in liver and endometrioid implants of control as well as treated animals. Activation of ribonucleotide reductase, detected by a doublet EPR signal at g = 2.0 with 2.3-mT hyperfine splitting, was found in small tumors. The beneficial effect of DNIC-glutathione was suggested to be due to DNIC breakdown near the tumors, with release of a large amount of molecular nitric oxide and nitrosonium ions that resulted in selective local cytotoxicity.
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Abstract

A study was made of the effect of binuclear dinitrosyl iron complexes (DNIC) with glutathione in rats with experimental endometriosis. The latter was induced in an autotransplantation model, where two fragments of endometrium with myometrium (2 × 2 mm) from the left uterine horn were grafted to the inner surface of the anterior abdominal wall. After 4 weeks, the test animals received i.p. injections of 0.5 mL DNIC-glutathione at a dose of 12.5 μmol/kg daily for 12 days. This treatment more than halved the total volume of endometrioid tumors. Remarkably, tumor growths from grafts in control rats were often attended by tumors spontaneously arising nearby or in other locations; no such secondary tumors were observed in DNIC-treated animals. The EPR signal with g av = 2.03 characteristic of protein-bound DNIC with thiol ligands was recorded in liver and endometrioid implants of control as well as treated animals. Activation of ribonucleotide reductase, detected by a doublet EPR signal at g = 2.0 with 2.3-mT hyperfine splitting, was found in small tumors. The beneficial effect of DNIC-glutathione was suggested to be due to DNIC breakdown near the tumors, with release of a large amount of molecular nitric oxide and nitrosonium ions that resulted in selective local cytotoxicity. Similar content being viewed by others

References

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