Abstract
Tienilic Acid (TA) is a uricosuric drug marketed in 1978 and which caused a number of rare immunoallergic hepatitis. It was withdrawn in US in 1980, in France in 1992. Early batches of tienilic acid also contained 0.1–0.5% tienilic acid isomer. Tienilic acid isomer (TAI), has been shown to be metabolised by Cytochrome P450 into a reactive thiophene 1-oxide which either binds to proteins, or can be trapped by sulfur nucleophiles (Valadon et al. 1996). Tienilic acid is metabolized by human cytochrome P450 2C9 into 5-hydroxytienilic acid (a major metabolite representing 70% of the dose excreted in human urine) but it also forms (a) reactive metabolite(s) which binds covalently to CYP 2C9 and it is a mechanism based inhibitor of CYP 2C9. Adding glutathione to incubations decreases the covalent binding, but only to 1 mol/mol P450. However the reactive metabolite of tienilic acid is still unknown. Recently Koenigs et al. have shown using ESI-LC-MS that CYP 2C9 binds ≈ 2 mol of TA in absence of GSH and only one in presence of 3 mM GSH (Koenigs et al. 1999).
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References
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© 2001 Springer Science+Business Media New York
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Belghazi, M., Jean, P., Poli, S., Schmitter, JM., Mansuy, D., Dansette, M.P. (2001). Use of Isotopes and LC-MS-ESI-TOF for Mechanistic Studies of Tienilic Acid Metabolic Activation. In: Dansette, P.M., et al. Biological Reactive Intermediates VI. Advances in Experimental Medicine and Biology, vol 500. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0667-6_17
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DOI: https://doi.org/10.1007/978-1-4615-0667-6_17
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