Effects of lead exposure on the expression of phospholipid hydroperoxidase glutathione peroxidase mRNA in the rat brain

Joong Koo Kang, Dong Geun Sul, Sang Yoon Nam, Hae Joon Kim, Eun Il Lee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Oxidative damage associated with lead in the brain has been proposed as a possible mechanism of lead toxicity. Of the many antioxidant enzymes, phospholipid hydroperoxidase glutathione peroxidase (PHGPx) is known to protect cells from lipid peroxide-mediated damage by catalyzing lipid peroxide reduction. In this study, the effects of lead on the activity and expression of PHGPx mRNA were investigated in the brains of rats exposed to lead for 8 weeks. Male Sprague-Dawley rats (3 week old, n = 40) were randomly divided into four groups of 10 and treated with four different concentrations of lead in drinking water: a low dose (0.1% lead acetate), a medium dose (0.3% lead acetate), and a high dose (1.0% lead acetate), and a control group (0% lead acetate). We compared the four groups in terms of body and brain weight, lead concentrations in the brain and blood, and the activities of superoxide dismutase (SOD), gluthatione peroxidase (GPx), and PHGPx mRNA in the brain. Phospholipid hydroperoxidase glutathione peroxidase was found to have a dominant role in lead exposure. We also performed in situ hybridization of PHGPx mRNA in the brain to identity PHGPx mRNA active sites. We found that the level of PHGPx mRNA in brain increased in the medium- and low-dose groups, but decreased in the high-dose group versus the non-lead-treated control group. These results suggest that lead exposure increases the expression of PHGPx mRNA in the low- and medium-dose groups without inducing structural changes, and that the reduced expression of PHGPx mRNA in the high-dose group was associated with structural damage. An In situ hybridization study showed that PHGPx mRNA in the brain is expressed mainly in the white matter of the cerebral hemisphere and in the Purkinje cells of the cerebellar hemispheres; these sites are known to be the vulnerable to lead toxity.

Original languageEnglish
Pages (from-to)228-236
Number of pages9
JournalToxicological Sciences
Volume82
Issue number1
DOIs
Publication statusPublished - 2004 Nov 1

Fingerprint

Glutathione Peroxidase
Rats
Brain
Phospholipids
Messenger RNA
Lipid Peroxides
In Situ Hybridization
Lead
Control Groups
Purkinje Cells
Cerebrum
Drinking Water
Peroxidase
Superoxide Dismutase
Sprague Dawley Rats
Toxicity
Catalytic Domain
Blood
Antioxidants
Body Weight

ASJC Scopus subject areas

  • Toxicology

Cite this

Effects of lead exposure on the expression of phospholipid hydroperoxidase glutathione peroxidase mRNA in the rat brain. / Kang, Joong Koo; Sul, Dong Geun; Nam, Sang Yoon; Kim, Hae Joon; Lee, Eun Il.

In: Toxicological Sciences, Vol. 82, No. 1, 01.11.2004, p. 228-236.

Research output: Contribution to journalArticle

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abstract = "Oxidative damage associated with lead in the brain has been proposed as a possible mechanism of lead toxicity. Of the many antioxidant enzymes, phospholipid hydroperoxidase glutathione peroxidase (PHGPx) is known to protect cells from lipid peroxide-mediated damage by catalyzing lipid peroxide reduction. In this study, the effects of lead on the activity and expression of PHGPx mRNA were investigated in the brains of rats exposed to lead for 8 weeks. Male Sprague-Dawley rats (3 week old, n = 40) were randomly divided into four groups of 10 and treated with four different concentrations of lead in drinking water: a low dose (0.1{\%} lead acetate), a medium dose (0.3{\%} lead acetate), and a high dose (1.0{\%} lead acetate), and a control group (0{\%} lead acetate). We compared the four groups in terms of body and brain weight, lead concentrations in the brain and blood, and the activities of superoxide dismutase (SOD), gluthatione peroxidase (GPx), and PHGPx mRNA in the brain. Phospholipid hydroperoxidase glutathione peroxidase was found to have a dominant role in lead exposure. We also performed in situ hybridization of PHGPx mRNA in the brain to identity PHGPx mRNA active sites. We found that the level of PHGPx mRNA in brain increased in the medium- and low-dose groups, but decreased in the high-dose group versus the non-lead-treated control group. These results suggest that lead exposure increases the expression of PHGPx mRNA in the low- and medium-dose groups without inducing structural changes, and that the reduced expression of PHGPx mRNA in the high-dose group was associated with structural damage. An In situ hybridization study showed that PHGPx mRNA in the brain is expressed mainly in the white matter of the cerebral hemisphere and in the Purkinje cells of the cerebellar hemispheres; these sites are known to be the vulnerable to lead toxity.",
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