Oxidative stress and liver toxicity in rats and human hepatoma cell line induced by pentachlorophenol and its major metabolite tetrachlorohydroquinone

Ying-Jan Wang, Ching-Chang Lee, Wen Ching Chang, Hung Bin Liou, Yuan Soon Ho

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Pentachlorophenol (PCP) is a pesticide used worldwide in industrial and domestic applications. It is used extensively as biocide and wood preservatives. Metabolic studies carried out in rodents and human liver homogenates have indicated that PCP undergoes oxidative dechlorination to form tetrachlorohydroquinone (TCHQ). Free radical catalyzed tissue injury is thought to play a fundamental role in human disease. In the present study, we examined the effects of PCP and TCHQ on the induction of lipid peroxidation and liver injury in rats. In addition, the cytotoxic dose, cell death mechanisms and related gene expressions induced by PCP and TCHQ were also determined for human hepatoma cell line (Hep G2). The results indicated that more toxic effects could be observed both in rats and human hepatoma cell line treated with TCHQ than its parent compound, PCP. Oxygen species may be involved in the mechanism of TCHQ intoxication since the urinary 8-epi-PGF2α and AST, ALT activities can be induced by TCHQ and attenuated by vitamin E treatment. Apoptosis features were found in cells treated with TCHQ but not PCP. TCHQ-induced cell damage may issue signals for the induction of HSPs, the decrease of the bcl/bax protein ratio and the decrease of CAS gene, whereas the PCP-induced damage may not.

Original languageEnglish
Pages (from-to)157-169
Number of pages13
JournalToxicology Letters
Volume122
Issue number2
DOIs
Publication statusPublished - 2001 Jun 20

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Pentachlorophenol
Oxidative stress
Metabolites
Liver
Toxicity
Rats
Hepatocellular Carcinoma
Oxidative Stress
Cells
Cell Line
bcl-2-Associated X Protein
Dechlorination
Dinoprost
Disinfectants
Poisons
Wounds and Injuries
Hep G2 Cells
Cell death
Vitamin E
Pesticides

All Science Journal Classification (ASJC) codes

  • Toxicology

Cite this

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title = "Oxidative stress and liver toxicity in rats and human hepatoma cell line induced by pentachlorophenol and its major metabolite tetrachlorohydroquinone",
abstract = "Pentachlorophenol (PCP) is a pesticide used worldwide in industrial and domestic applications. It is used extensively as biocide and wood preservatives. Metabolic studies carried out in rodents and human liver homogenates have indicated that PCP undergoes oxidative dechlorination to form tetrachlorohydroquinone (TCHQ). Free radical catalyzed tissue injury is thought to play a fundamental role in human disease. In the present study, we examined the effects of PCP and TCHQ on the induction of lipid peroxidation and liver injury in rats. In addition, the cytotoxic dose, cell death mechanisms and related gene expressions induced by PCP and TCHQ were also determined for human hepatoma cell line (Hep G2). The results indicated that more toxic effects could be observed both in rats and human hepatoma cell line treated with TCHQ than its parent compound, PCP. Oxygen species may be involved in the mechanism of TCHQ intoxication since the urinary 8-epi-PGF2α and AST, ALT activities can be induced by TCHQ and attenuated by vitamin E treatment. Apoptosis features were found in cells treated with TCHQ but not PCP. TCHQ-induced cell damage may issue signals for the induction of HSPs, the decrease of the bcl/bax protein ratio and the decrease of CAS gene, whereas the PCP-induced damage may not.",
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Oxidative stress and liver toxicity in rats and human hepatoma cell line induced by pentachlorophenol and its major metabolite tetrachlorohydroquinone. / Wang, Ying-Jan; Lee, Ching-Chang; Chang, Wen Ching; Liou, Hung Bin; Ho, Yuan Soon.

In: Toxicology Letters, Vol. 122, No. 2, 20.06.2001, p. 157-169.

Research output: Contribution to journalArticle

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AU - Wang, Ying-Jan

AU - Lee, Ching-Chang

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AU - Ho, Yuan Soon

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