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Cytotoxic and cytoprotective activities of curcumin. Effects on paracetamol-induced cytotoxicity, lipid peroxidation and glutathione depletion in rat hepatocytes.

Abstract：

:The cytoprotective effect of curcumin, a natural constituent of Curcuma longa, on the cytotoxicity of paracetamol in rat hepatocytes was studied. Paracetamol was selected as a model-toxin, since it is known to be bioactivated by 3-methylcholanthrene inducible cytochromes P450 presumably to N-acetyl-p-benzoquinone imine (NAPQI), a reactive metabolite which upon overdosage causes protein- and non-protein thiol-depletion, lipid peroxidation and cytotoxicity measured as LDH-leakage. At low concentrations curcumin was found to protect significantly against paracetamol-induced lipid peroxidation, without protection against paracetamol-induced LDH-leakage and without protection against paracetamol-induced GSH-depletion. At a 100 times higher concentration of curcumin the observed protective effect on lipid peroxidation was accompanied with a tendency to increase cellular GSH-depletion and LDH-leakage. No time-dependency was found as to the curcumin-induced effects: treatment of the hepatocytes 1 hr before, concomitantly or 1 hr after the addition of paracetamol to the cells had similar effects. In contrast to what was expected on the basis of previous in vivo experiments, at higher concentrations curcumin itself was found to be slightly cytotoxic. Curcumin-induced LDH-leakage was accompanied by a significant depletion of GSH. It has been concluded that the observed cytoprotective and cytotoxic activities of curcumin may be explained by a strong anti-oxidant capacity of curcumin and the capability of curcumin to conjugate with GSH. Furthermore, it has been concluded that lipid peroxidation is not playing a causal role in cell-death induced by paracetamol or by curcumin.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Donatus IA,Sardjoko,Vermeulen NP

doi

10.1016/0006-2952(90)90603-i

subject

Has Abstract

pub_date

1990-06-15 00:00:00

pages

1869-75

issue

12

eissn

0006-2952

issn

1873-2968

pii

0006-2952(90)90603-I

journal_volume

39

pub_type

杂志文章

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