Validation of lucigenin (bis-N-methylacridinium) as a chemilumigenic probe for detecting superoxide anion radical production by enzymatic and cellular systems.

The Journal of Biological Chemistry
Y LiM A Trush

Abstract

Lucigenin is most noted for its wide use as a chemiluminescent detector of superoxide anion radical (O2-.) production by biological systems. However, its validity as a O2-.-detecting probe has recently been questioned in view of its ability to undergo redox cycling in several in vitro enzymatic systems, which produce little or no O2-.. Whether and to what extent lucigenin redox cycling occurs in systems that produce significant amounts of O2-. has not been carefully investigated. We examined and correlated three end points, including sensitive measurement of lucigenin-derived chemiluminescence (LDCL), O2 consumption by oxygen polarography, and O2-. production by 5-(diethoxyphosphoryl)-5-methyl-1-pyrroline-N-oxide spin trapping to characterize the potential of lucigenin to undergo redox cycling and as such to act as an additional source of O2-. in various enzymatic and cellular systems. Marked LDCL was elicited at lucigenin concentrations ranging from 1 to 5 microM in all of the O2-.-generating systems examined, including xanthine oxidase (XO)/xanthine, lipoamide dehydrogenase/ NADH, isolated mitochondria, mitochondria in intact cells, and phagocytic NADPH oxidase. These concentrations of lucigenin were far below those that stim...Continue Reading

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