Reactions of nitrosobenzene with reduced glutathione. |
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Authors: | P Eyer |
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Affiliation: | Pharmakologisches Institut der Universität München Nussbaumstrasse 26, 8000 München 2G.F.R. |
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Abstract: | Nitrosobenzene (NOB) formed acid labile conjugates with reduced glutathione (GSH) and hemoglobin within red cells. In vitro, NOB rapidly reacted with GSH with formation of phenylhydroxylamine (PH), oxidized glutathione (GSSG), and a water-soluble compound identified as glutathionesulfinanilide (GSO-AN). Free aniline (AN), aminophenols and azoxybenzene were not detected. The proportion of PH formed increased with increasing GSH concentration and at higher pH values. Spectroscopic analysis revealed the formation of a labile adduct following a second order reaction (K = 5 x 10(3) M-1 . sec-1 at pH 7.4 and 37 degrees). This reaction was reversible because nearly all NOB could be extracted with ether from the labile intermediate. On the other hand, the labile intermediate was transformed into GSO-AN (with increasing rate at lower pH values) or it was cleaved by GSH with formation of GSSG and PH. Intermediate formation of NOB and thiol radicals was ruled out by analysis of the equilibrium data. A tentative scheme is presented for the proposed reaction mechanism. |
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Keywords: | AN aniline GSH reduced glutathione, GSO-AN, glutathionesulfinanilide glutathione sulfinic acid GSSG oxidized glutathione HPLC high performance liquid chromatography NOB nitrosobenzene nitrosobenzene determined by its UV absorbance PH phenylhydroxylamine TLC thin-layer chromatography |
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