Abstract | BACKGROUND: METHODS: We investigated the effect of different nontoxic doses of vitamin E on erythrocyte SOD activity and plasma total antioxidant capacity in rats, receiving 0 (control group), 100, 300 and 600 mg vitamin E/kilogram of body weight intramuscularly twice a week over 6-weeks. RESULTS: We observed a linear increase in SOD activity in the first dosing group, which was significant (p<0.05) after 6th week compared to the control level. There was an increase in SOD activity at the end of 2nd and significant increase after 4th weeks, which was followed by a significant decrease at the end of 6th week in the second dosing group. In the third dosing group, there was a significant increase at the end of 2nd week and a significant decrease at the end of 4th and 6th weeks in the SOD activity. The changes in plasma antioxidant capacity were parallel to that of SOD activity with a significant and strong degree of correlation in the 4th and 6th weeks (r=0.7 and r=0.8, respectively). Serum levels of Vitamin E also increased in a time- and dose-dependent manner; the highest level was achieved in the 600 mg/kg dosing group after 6 weeks. CONCLUSIONS: Non-toxic doses of vitamin E at some levels can up-regulate SOD activity, but cumulative effect of the same doses can lead to attenuation of SOD activity and hence antioxidant defense.
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Authors | Abolfazl Golestani, Roghieh Rastegar, Ahmad Shariftabrizi, Shahnaz Khaghani, Seyed Mehdi Payabvash, Amirali H Salmasi, Ahmad R Dehpour, Parvin Pasalar |
Journal | Clinica chimica acta; international journal of clinical chemistry
(Clin Chim Acta)
Vol. 365
Issue 1-2
Pg. 153-9
(Mar 2006)
ISSN: 0009-8981 [Print] Netherlands |
PMID | 16183047
(Publication Type: Journal Article)
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Chemical References |
- Antioxidants
- Vitamin E
- Superoxide Dismutase
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Topics |
- Animals
- Antioxidants
(metabolism, pharmacology)
- Dose-Response Relationship, Drug
- Male
- Rats
- Rats, Sprague-Dawley
- Superoxide Dismutase
(blood)
- Vitamin E
(administration & dosage, pharmacology)
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