Record Display for the EPA National Library Catalog

RECORD NUMBER: 281 OF 1368

OLS Field Name OLS Field Data
Main Title Dehydrogenation: A Previously Unreported Pathway of Lindane Metabolism in Mammals.
Author Chadwick, Robert W. ; Chuang, Lucy T. ; Williams., Katherine ;
CORP Author National Environmental Research Center, Research Triangle Park, N.C. Pesticides and Toxic Substances Effects Lab.
Year Published 1975
Stock Number PB-279 180
Additional Subjects Pesticides ; Toxicology ; Dehydrogenation ; Liver ; Rats ; Chlorine organic compounds ; Metabolism ; In vivo analysis ; In vitro analysis ; DDT ; Physiology ; Chlorobenzenes ; Enzymes ; Ribosomes ; Lindane ; Reprints ; Metabolites ; Toxic substances ; Cyclohexene/hexachloro
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB-279 180 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 12p
Abstract
The study presents evidence for the dehydrogenatin of lindane by a hepatic microsomal mixed-functin oxidase system. Preliminary investigation established that the incubation of lindane with rat liver homogenates produces a chlorinated, nonpolar compound identified as hexachlorocyclohexene. Differential centrifugation resulted in the sedimentation of most of the dehydrogenase activity in the microsomal fraction. Optimum in vitro assay conditions were established and it was found that the dehydrogenase system required molecular oxygen and reduced pyridine nucleotide coenzyme for maximum activity. Inhibition by SKF 525-A and CO suggested that the enzyme was cytochrome P-450 dependent. Lack of inhibition by cyanide indicated that the cytochrome b5 desaturase system was probably not involved. Pretreatment of rats with DDT, which stimulates lindane metabolism, also induced significantly higher dehydrogenase activity. Both the in vivo and in vitro metabolism of hexachlorocyclohexene produced previously identified lindane metabolites.