Abstract:
:Acetaminophen (APAP) administration (600 mg/kg, ip) to 18-hr fasted, 3-month-old male CD-1 mice results in necrosis of the convoluted renal proximal tubules with a corresponding elevation of plasma urea nitrogen (BUN). Administration of the gamma-glutamyl transpeptidase inhibitor, L-(alpha S,5S)-alpha-amino-3-chloro-4,5-dihydroxy- 5-isoxazoleacetic acid (AT-125) (50 mg/kg, ip), to mice 30 min before APAP significantly diminished the APAP-induced histopathologic damage and BUN elevation. Administration of the organic-anion transport inhibitor, probenecid (150 mg/kg, ip), 30 min before APAP challenge also protected against the APAP-induced elevation of BUN and detectable histopathologic changes. By contrast, pretreatment of mice with the cysteine conjugate beta-lyase inhibitor, (aminooxy)acetic acid (100 mg/kg, ip), 1 hr before APAP did not alter nephrotoxicity. None of the pretreatments altered the APAP-induced elevation of plasma sorbitol dehydrogenase activity, nor were there any detectable changes in liver histopathology after APAP challenge. Despite the protective effects of both probenecid and AT-125 against nephrotoxicity, they did not affect either the level of immunochemically detectable covalent binding to protein or the depletion of renal glutathione at 4 hr after APAP. Thus, the protection appears independent of effects on renal APAP uptake or activation and indirectly suggests that an APAP-glutathione conjugate may contribute to the observed nephrotoxicity.
journal_name
Toxicol Appl Pharmacoljournal_title
Toxicology and applied pharmacologyauthors
Emeigh Hart SG,Wyand DS,Khairallah EA,Cohen SDdoi
10.1006/taap.1996.0020subject
Has Abstractpub_date
1996-01-01 00:00:00pages
161-9issue
1eissn
0041-008Xissn
1096-0333pii
S0041-008X(96)90020-4journal_volume
136pub_type
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
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