当前位置： SCI文献检索 > BASIC & CLINICAL PHARMACOLOGY & TOXICOLOGY期刊下所有文献 > In vivo and in vitro effects of cadmium on adult rat brain total antioxidant status, acetylcholinesterase, (Na+, K+)-ATPase and Mg2+-ATPase activities: protection by L-cysteine.

In vivo and in vitro effects of cadmium on adult rat brain total antioxidant status, acetylcholinesterase, (Na+, K+)-ATPase and Mg2+-ATPase activities: protection by L-cysteine.

Abstract：

:This study was undertaken in order to investigate a) the short- and long-term in vivo effects of cadmium (Cd) on brain acetylcholinesterase (AChE), (Na+, K+)-ATPase activities in adult rats, b) the concentration-dependent in vitro and in vivo (acute experiment) effects of Cd on the activity of those enzymes, c) the in vivo and in vitro effects of the antioxidant L-cysteine (Cys) on the above enzyme activities, and d) the evaluation of brain total antioxidant status after in vivo Cd, L-cysteine, or L-cysteine+Cd administration in rats. In vitro, CdSO4 inhibited pure and brain AChE in concentrations higher than 0.1 mM, while it activated by approximately 70% (P<0.001) brain Na+, K+ -ATPase in concentrations up to 0.1 mM and inhibited its activity in higher concentrations. Mg2+ -ATPase was not influenced up to 0.1 mM concentration, while it was inactivated (40%, P<0.001) in higher CdSO4 concentrations. A dose-response study of brain CdSO4 (1,2 and 5 mg/kg once 8 hr before decapitation) revealed a dose-dependent decrease (-14 to -30%, P<0.001) of brain AChE activity, an increase of Na+, K+ -ATPase activity (+47 to +200%, P<0.001) and an increase of Mg2+ -ATPase only after the highest dose (5mg/kg) in the short-term treatment of rats. Long-term Cd administration (1 mg/kg rat daily for 4 months) activated brain AChE and Na+, K+ -ATPase about 50-65% (P<0.001) but not Mg2+ -ATPase. Brain total antioxidant status was decreased by Cd (30%, P<0.01), while it was increased by L-cysteine or L-cysteine+Cd (50%, P<0.001) in the short-term in vivo treatment. L-cysteine reversed the enzymatic activity changes observed with Cd alone in the high-dose short-term in vivo treatment of rats, as well as the brain AChE inhibition induced by Cd in the in vitro experiments. These results indicate that: a) Cd can influence in a different way the examined enzyme activities after short- and long-term administration, b) Cd may modulate brain cholinergic mechanism(s), neural excitability and metabolic energy production, and c) L-cysteine can have a protective antioxidant effect on the oxidative stress of the brain induced by Cd.

journal_name

Basic Clin Pharmacol Toxicol

journal_title

Basic & clinical pharmacology & toxicology

authors

Carageorgiou H,Tzotzes V,Pantos C,Mourouzis C,Zarros A,Tsakiris S

doi

10.1111/j.1742-7843.2004.pto940303.x

subject

Has Abstract

pub_date

2004-03-01 00:00:00

pages

112-8

issue

eissn

1742-7835

issn

1742-7843

journal_volume

pub_type

杂志文章

在线工具

In vivo and in vitro effects of cadmium on adult rat brain total antioxidant status, acetylcholinesterase, (Na+, K+)-ATPase and Mg2+-ATPase activities: protection by L-cysteine.