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Characterization of extracellular menadion‐catalyzed H2O2 production by NTH/3T3 cells

The extracellular menadione‐catalyzed H202 production by NIH/3T3 cells was expected to depend on plasma membrane‐bound NAD(P)H:quinone oxidoreductase. This enzyme was estimated to be a flavoprotein with the molecular mass of 70 KDa. Km values of plasma membrane‐bound NAD(P)H:quinone oxidoreductase producing H20 2 were 60 μM for NADH and 150 μM for NADPH. Ca2+ ionophore A23187 controlled menadione‐catalyzed H2O2 production by the cells in time‐ and concentration‐dependent manner.