Habitual exercise induced resistance to oxidative stress.
We investigated whether habitual exercise (HE) modulates levels of oxidative DNA damage and responsiveness to oxidative stress induced by renal carcinogen Fe-nitrilotriacetic acid (Fe-NTA). During a ten week protocol, two groups of rats either remained sedentary or underwent swimming for 15--60 min per day, 5 days per week, with or without a weight equivalent to 5% of their body weight. Then we injected Fe-NTA and sacrificed the rats 1 h after the injection. We determined the activity of superoxide dismutase (SOD) in diaphragm and kidney, evaluated levels of 8-hydroxydeoxyguanosine (8OHdG), catalase, and glutathione peroxidase, and assayed OGG1 protein levels in kidney. SOD activity in the diaphragm and kidney was increased in HE rats. By itself, HE had no effect on the level of 8OHdG, but it did significantly suppress induction of 8OHdG by Fe-NTA, and the amount of suppression correlated with intensity of exercise. These results suggest that HE induces resistance to oxidative stress and, at least at the initiation stage, inhibits carcinogenesis.
Nakatani
Koji
K
Department of Environmental Medicine, Graduate School of Medical and Dental Sciences, Kagoshima University, Sakuragaoka, Kagoshima, 890-8544, Japan.
Komatsu
Masaharu
M
Kato
Toyohiro
T
Yamanaka
Takao
T
Takekura
Hiroaki
H
Wagatsuma
Akira
A
Aoyama
Kohji
K
Xu
Baohui
B
Hirano
Takeshi
T
Kasai
Hiroshi
H
Ando
Seiichi
S
Takeuchi
Toru
T
D000080242:8-Hydroxy-2'-Deoxyguanosine; D000818:Animals; D001835:Body Weight; D002273:Carcinogens; D004249:DNA Damage / Q000502:physiology*; D045647:DNA Glycosylases / Q000378:metabolism; D003849:Deoxyguanosine / Q000031:analogs & derivatives / Q000032:analysis; D003964:Diaphragm / Q000201:enzymology / Q000378:metabolism; D005290:Ferric Compounds; D007668:Kidney / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D009571:Nitrilotriacetic Acid / Q000031:analogs & derivatives; D018384:Oxidative Stress / Q000187:drug effects / Q000502:physiology*; D005082:Physical Exertion; D051381:Rats; D013550:Swimming
D002273:Carcinogens; D005290:Ferric Compounds; D000080242:8-Hydroxy-2'-Deoxyguanosine; D045647:DNA Glycosylases; C483741:OGG1 protein, rat; D003849:Deoxyguanosine; D009571:Nitrilotriacetic Acid; C020326:ferric nitrilotriacetate