Abstract
Soluble rat liver glutathione S-transferases have been purified and a previously undescribed peak was observed. This peak contained glutathione S-transferase activity which was extensively inhibited by indomethacin. Glutathione conjugation of 1-chloro-2,4-dinitrobenzene by this isozyme, designated glutathione S-transferase VII, was inhibited 44 and 68% at indomethacin concentrations of 0.20 and 1.00 μM, respectively. The other six basic glutathione S-transferase isozymes were relatively unaffected by low concentrations of indomethacin. The pharmacological significance of this inhibition by indomethacin is largely dependent on the role of the glutathione S-transferase VII in leukotriene synthesis.
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