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Comparison of the protective effects of N-acetylcysteine, 2-mercaptopropionylglycine and dithiothreitol against acetaminophen toxicity in mouse hepatocytes.

Abstract：

:The effects of N-acetylcysteine (NAC), 2-mercaptopropionylglycine (MPG) and dithiothreitol (DTT) on the metabolism and toxicity of acetaminophen (APAP) were examined in isolated mouse hepatocytes maintained in primary culture on collagen-coated dishes. Both NAC and MPG increased the formation of the glutathione and sulfate conjugates of APAP and decreased the covalent binding of the APAP reactive metabolite to cellular protein. DTT did not increase APAP metabolism but did decrease covalent binding. NAC, MPG and DTT decreased plasma membrane damage, as measured by leakage of lactate dehydrogenase from hepatocytes, during a 4-h incubation in 5.0 mM APAP. NAC, MPG and DTT also reduced the APAP-induced fall in glutathione levels in these cells. In other experiments, hepatocytes were exposed to 5.0 mM APAP for 1 h and then incubated during a post-exposure period in APAP-free medium. Damage increased during this post-exposure incubation. Addition of DTT, but not NAC or MPG, after APAP exposure protected the hepatocytes from plasma membrane damage during the post-exposure period. These results indicate that NAC and MPG exert their protective effects by their action on the reactive metabolite of APAP. As well as its effect in reducing the formation of the reactive metabolite, DTT has a potent protective effect against the toxic processes initiated by the APAP reactive metabolite.

journal_name

Toxicology

journal_title

Toxicology

authors

Harman AW,Self G

doi

10.1016/0300-483x(86)90106-x

subject

Has Abstract

pub_date

1986-10-01 00:00:00

pages

83-93

issue

1

eissn

0300-483X

issn

1879-3185

pii

0300-483X(86)90106-X

journal_volume

41

pub_type

杂志文章

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