PMID: 8059533Apr 1, 1994

Dual effects of a novel thienodiazepine platelet-activating factor antagonist, on drug-oxidizing enzymes in beagle dog

Xenobiotica; the Fate of Foreign Compounds in Biological Systems
E TanakaT Horie

Abstract

1. We have examined the effects of (S)-(+)-6-(2-chlorophenyl)-3-cyclopropanecarbonyl-8, 11-dimethyl-2,3,4,5-tetrahydro-8H-pyrido[4',3':4,5]thieno[3, 2-f][1, 2, 4]triazolo[4, 3-a][1, 4]diazepine (E-6123), a novel thienodiazepine platelet-activating factor antagonist, on drug-oxidizing capacity in beagle dog, using antipyrine (AP) and trimethadione (TMO) as two model substrates. 2. The plasma half-life (t1/2) and area under the curve (AUC) of AP (0.5 mg/kg, i.v. injection) increased in a dose-dependent manner after a single oral dose of E-6123 (0.2, 1 or 10 mg/kg), whereas the total body clearance (Cl) of AP was decreased, and the apparent volume of distribution (Vd) was unchanged. 3. The pharmacokinetic parameters (t1/2, Cl and AUC) of the metabolism of TMO (4 mg/kg, i.v.) after repeated oral administration of E-6123 (10 mg/kg for 7 days) were not significantly changed in comparison with findings in control dog. The ratio of dimethadione (DMO), being the only TMO metabolite, to TMO in plasma after i.v. administration of TMO in E-6123-treated dog was increased only 5 and 15 min after the final dose, but was not changed at other sampling times (0.5, 1, 2 4, 6, 8 and 12 h). 4. The content of b5, the activity of p-nitroanisole O-dem...Continue Reading

References

Sep 1, 1979·Clinical Pharmacology and Therapeutics·E S Vesell
Nov 1, 1979·Xenobiotica; the Fate of Foreign Compounds in Biological Systems·M DanhofD D Breimer
May 1, 1984·Xenobiotica; the Fate of Foreign Compounds in Biological Systems·A BastB H Kroes

Related Concepts

Cytochrome P-450 CYP2B (lung microsomal)
6-(2-chlorophenyl)-3-cyclopropanecarbonyl-8,11-dimethyl-2,3,4,5-tetrahydro-8H-pyrido(4',3'-4,5)-thieno-(3,2-f)-1,2,4-triazolo(4,3-a)(1,4)diazepine
Pyramidone
Azepines
Cytochrome P-450 Oxygenase
Canis familiaris
Half-Life
Total Body Clearance Rate
Microsomes, Liver
Nitroanisole O-Demethylase

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