THE EFFECTS OF UNSATURATED FATTY-ACIDS, OXIDIZING-AGENTS AND MICHAEL REACTION ACCEPTORS ON THE INDUCTION OF N-ETHYLMALEIMIDE REDUCTASE IN ESCHERICHIA-COLI - POSSIBLE APPLICATION FOR DRUG DESIGN OF CHEMOPROTECTORS
K. Miura et al., THE EFFECTS OF UNSATURATED FATTY-ACIDS, OXIDIZING-AGENTS AND MICHAEL REACTION ACCEPTORS ON THE INDUCTION OF N-ETHYLMALEIMIDE REDUCTASE IN ESCHERICHIA-COLI - POSSIBLE APPLICATION FOR DRUG DESIGN OF CHEMOPROTECTORS, Methods and findings in experimental and clinical pharmacology, 19(3), 1997, pp. 147-151
Menadione and dimethyl maleate, Michael reaction acceptors, induced N-
ethylmaleimide (NEM) reductase activity in Escherichia coli strain DH5
a. Linoleic acid also induced NEM reductase activity, but oleic acid,
which is less susceptible to lipid peroxidation than linoleic acid, di
d not induce NEM reductase activity. In addition, NEM reductase activi
ty was induced by menadione and linoleic acid also in strain DH5, Y108
8 and Y1090. Linoleic acid is not a Michael reaction acceptor, but is
known to produce Michael reaction acceptors such as alkenals and 4-hyd
roxyalkenals as a result of free-radical-initiated lipid peroxidation.
Thus, our findings suggested that lipid peroxidation was involved in
the induction of NEM reductase by linoleic acid. The electrophilic pro
perty of Michael reaction acceptors provides the signal for induction
of phase II enzymes such as glutathione S-transferase and quinone redu
ctase in mammals. The inducer potency of phase II enzymes has been use
d to design chemoprotective drugs. Therefore, the inducible nature of
this enzyme will serve not only for the elucidation of its physiologic
al function, but also for the evaluation of chemoprotective drugs.