title: Effect of cytochrome P450 inducers on the metabolism and toxicity of thiram in rats.
abstract: Thiram is a dithiocarbamate compound widely used as an agricultural fungicide. This study examined the effect of cytochrome P450 (CYP) inducers on the metabolism and toxicity of thiram in rats. Rats were pretreated with 3-methyl cholathrene (3-MC), phenobarbital (PB), isoniazid (INH), or pregnenolone-16a-carbonitrile (PCN) as selective inducers of CYP 1A1, 2B1, 2E1 and 3A2, respectively. Thiram was administered ip to induced rats at 0.1 or 0.5 mmol/kg, and the animals were sacrificed 3 or 24 h later to assess P450 interaction and liver damage, respectively. No significant inhibition of 3-me-induced CYP1A1 was observed with either thiram dose at 3 or 24 h after treatment; similar results were noted for rats induced with PB or PCN. By contrast, when INH was the selective inducer of CYP2E1, there was significant inhibition by thiram 3 h and 24 h after treatment, suggesting that thiram was metabolized by the induced CYP2E1; there was a significant increase in ALT activity reflective of liver damage in the rats treated with thiram. The results suggest that CYP2EI induced by INH may be significantly involved in the metabolism of thiram, and the associated liver damage.
authors.affiliation: Department of Biomedical Sciences, College of Veterinary Medicine, Nursing and Allied Health, Tuskegee University, Tuskegee, AL 36088 , USA.
authors.forename: Prasad S
authors.initials: PS
authors.lastname: Dalvi
authors.forename: Temeri
authors.initials: T
authors.lastname: Wilder-Ofie
authors.forename: Bernadette
authors.initials: B
authors.lastname: Mares
authors.forename: Candace
authors.initials: C
authors.lastname: Lane
authors.forename: Ramesh R
authors.initials: RR
authors.lastname: Dalvi
authors.forename: Leonard H
authors.initials: LH
authors.lastname: Billups
mesh_terms: D000410:Alanine Transaminase / Q000378:metabolism; D000818:Animals; D000935:Antifungal Agents / Q000378:metabolism / Q000633:toxicity*; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis*; D004790:Enzyme Induction; D007527:Isoenzymes / Q000378:metabolism; D008099:Liver / Q000187:drug effects* / Q000201:enzymology; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D013893:Thiram / Q000378:metabolism / Q000633:toxicity*
chemical_list: D000935:Antifungal Agents; D007527:Isoenzymes; D013893:Thiram; D003577:Cytochrome P-450 Enzyme System; D000410:Alanine Transaminase