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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

In vitro covalent binding of 3-[14C]methylindole metabolites in goat tissues.

Covalent binding of 3-[14C]methylindole (3[14C]MI) in crude microsomal preparations of goat lung, liver, and kidney was measured to determine if a reactive intermediate was formed during the in vitro metabolism of 3-methylindole (3MI). The bound radioactivity was highest in lung compared to liver and kidney. The amount of bound radioactivity per nanomole of cytochrome P-450 was approximately 10 times higher in the lung compared to liver. No detectable bound radioactivity was found when 3-[3H]methyloxindole was used as the substrate. Cofactor requirements and the effects of inhibitors indicate that a mixed function oxidase (MFO) system is involved in formation of a reactive intermediate. Inhibitors and conjugating agents that are known to reduce the severity of 3MI-induced lung injury such as piperonyl butoxide (MFO inhibitor) and glutathione (conjugating agent) significantly decreased the in vitro binding of 3[14C]MI. The results indicate that a reactive intermediate is produced during the metabolism of 3MI by the MFO system. The organ specificity in binding suggests that covalent binding by lung microsomes may be related to the mechanism of 3MI-induced lung injury.[1]


  1. In vitro covalent binding of 3-[14C]methylindole metabolites in goat tissues. Bray, T.M., Carlson, J.R., Nocerini, M.R. Proc. Soc. Exp. Biol. Med. (1984) [Pubmed]
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