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Molecular Pharmacology

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Abstract

1,3-(2-Chloroethyl)-1-nitrosourea potentiates the toxicity of acetaminophen both in the phenobarbital-induced rat and in hepatocytes cultured from such animals.

M E Kyle, D Nakae, A Serroni and J L Farber
Molecular Pharmacology October 1988, 34 (4) 584-589;
M E Kyle
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D Nakae
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A Serroni
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J L Farber
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Abstract

The toxicity of acetaminophen was studied in hepatocytes cultured from phenobarbital-induced male rats. Such cells were less sensitive to acetaminophen than similar ones cultured from animals induced with 3-methylcholanthrene. In both cases, the toxicity of acetaminophen depended on its metabolism. Inhibition of glutathione reductase with 1,3-(2-chloroethyl)-1-nitrosourea (BCNU) potentiated the toxicity of acetaminophen in the presence or absence of 100 mM acetone, an agent that activates the mixed function oxidation of the toxin. BCNU enhanced the rate and extent of the depletion of GSH in the presence or absence of acetone. Pretreatment of the hepatocytes with the ferric iron chelator deferoxamine or addition to the culture medium of the antioxidant N,N'-diphenyl-p-phenylenediamine prevented the toxicity of acetaminophen in the presence of BCNU whether or not there was acetone in the cultures. BCNU similarly potentiated the hepatotoxicity of acetaminophen in the intact, phenobarbital-induced rat. These data indicate that the mechanism of the killing of hepatocytes induced with phenobarbital is similar to that reported previously with hepatocytes prepared from animals induced with 3-methylcholanthrene. In both cases it would seem that the liver cells are killed by acetaminophen as a result of an oxidative stress that accompanies the metabolism of this hepatotoxin.

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Molecular Pharmacology
Vol. 34, Issue 4
1 Oct 1988
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Abstract

1,3-(2-Chloroethyl)-1-nitrosourea potentiates the toxicity of acetaminophen both in the phenobarbital-induced rat and in hepatocytes cultured from such animals.

M E Kyle, D Nakae, A Serroni and J L Farber
Molecular Pharmacology October 1, 1988, 34 (4) 584-589;

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Abstract

1,3-(2-Chloroethyl)-1-nitrosourea potentiates the toxicity of acetaminophen both in the phenobarbital-induced rat and in hepatocytes cultured from such animals.

M E Kyle, D Nakae, A Serroni and J L Farber
Molecular Pharmacology October 1, 1988, 34 (4) 584-589;
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