Journal of Diagnostic Techniques and Biomedical AnalysisISSN: 2469-5653

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Research Article, J Diagnos Tech Biomed Anal Vol: 2 Issue: 1

The Effects of 1-Aminobenzotriazole Inhibition on the Formation of Acyl-Glucuronide and Acyl-Glutathione Metabolites in Rat Hepatocytes

Howard Horng and Leslie Z Benet*
Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
Corresponding author : Leslie Z Benet
Department of Bioengineering and Therapeutic Sciences, University of California, 533 Parnassus Ave., Room U-68, San Francisco, CA 94143-0912, USA
Tel: 415-476-3853; Fax: 415-476-8887
E-mail: [email protected]
Received: November 12, 2013 Accepted: February 08, 2014 Published: February 15, 2014
Citation: Horng H, Benet LZ (2013) The Effects of 1-Aminobenzotriazole Inhibition on the Formation of Acyl-Glucuronide and Acyl-Glutathione Metabolites in Rat Hepatocytes. J Diagn Tech Biomed Anal 2:1.doi:10.4172/2469-5653.1000106

Abstract

The Effects of 1-Aminobenzotriazole Inhibition on the Formation of Acyl-Glucuronide and Acyl-Glutathione Metabolites in Rat Hepatocytes

1-Aminobenzotriaole (ABT) is a commonly used non-selective mechanism based human and non-human cytochrome P450 (P450) inactivator. However, the direct effects of ABT mediated P450 inhibition on conjugative metabolism, specifically acyl-glucuronide and acyl-glutathione formation has not been previously investigated. In the present study, we evaluated the in vitro effects of ABT induced inhibition of P450 metabolism on the formation of 1-O-acyl-glucuronides of the carboxylic acid-containing drugs gemfibrozil (GEM), tolmetin (TOL), mefenamic acid (MFA), and diclofenac (DCF), and the S-acyl-glutathione formation of MFA and DCF in rat hepatocytes. In vitro incubations of each carboxylic acid-containing drug (100 μM) separately in rat hepatocytes preincubated (30 min) with ABT (500 μM), resulted in 12.7%, 30%, 37%, and 40% increases in the formation of 1-O-acyl-glucuronides at the 30 min time point for GEM, TOL, MFA, and DCF, respectively. However, in the same incubations, MFA and DCF resulted in little to no difference in maximum glutathione concentrations formed in the presence of ABT, suggesting that the mefenamic acid-S-acyl-glutathione (MFA-GSH) and diclofenac-S-acyl-glutathione (DCF-GSH) formation was not the direct result of their corresponding acyl-glucuronides inherent reactivity.

Keywords: 1-Aminobenzotriaole; P450 inactivator; Induced inhibition; Glucuronidation; Drug metabolism; Toxicity

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