Cadmium-induced oxidative stress and DNA damage in kidney of pregnant female rats.
In the present study, we have investigated the influence of sub-acute treatment with cadmium (Cd) on some parameters indicative of oxidative stress and DNA damage in tissues of pregnant female rats. Pregnant female rats (n=6) were injected subcutaneously, daily with a dose of cadmium chloride of 3 mg/kg body weight (b.w.) from day 6 to day 19 of pregnancy, and they were allowed to deliver normally. MDA level and GPx, CAT and SOD activities were used as markers of oxidative stress in liver and kidney. The 8-oxo-dG level was measured by the HPLC-EC system. Cd treatment increased MDA (+116%, p<0.01) in kidney. Moreover, Cd treatment also decreased CuZn-SOD (-11%, p<0.05) and GSH level (-52%, p<0.05) in kidney. Treated rats displayed an increase of the liver metallothionein (MT) level. Induction of MT in liver was probably implicated in the detoxification of Cd. The high level of Cd (3 mg/kg) used in the present study is partially neutralized by MT in liver, whereas the free fraction could be implicated in the oxidative stress and DNA oxidation observed in kidney. Cd treatment failed to alter 8-oxodGuo, indicating the absence of DNA oxidation in liver; by contrast, the same treatment increased the 8-oxodGuo level (+51%, p<0.05) in the kidney of pregnant female rats, indicating an oxidative stress associated with DNA damage only in kidney.
Laboratoire de physiologie intégrée, faculté des sciences de Bizerte, 7021 Jarzouna, Tunisia. bourassihem2002@yahoo.fr
Sihem
S
Chater
Thierry
T
Douki
Catherine
C
Garrel
Alain
A
Favier
Mohsen
M
Sakly
Hafedh
H
Abdelmelek
D000818:Animals; D002104:Cadmium / Q000633:toxicity*; D002851:Chromatography, High Pressure Liquid; D004247:DNA / Q000096:biosynthesis / Q000235:genetics; D004249:DNA Damage / Q000502:physiology*; D005260:Female; D005978:Glutathione / Q000378:metabolism; D007668:Kidney / Q000187:drug effects / Q000378:metabolism*; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008315:Malondialdehyde / Q000378:metabolism; D018384:Oxidative Stress / Q000502:physiology*; D011247:Pregnancy; D051381:Rats; D017208:Rats, Wistar; D013056:Spectrophotometry, Ultraviolet; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
D017392:Thiobarbituric Acid Reactive Substances; D002104:Cadmium; D008315:Malondialdehyde; D004247:DNA; D005978:Glutathione