Beta-carotene prevents x-ray induction of micronuclei in human lymphocytes
| Autor: | S Kobayashi, Naoko Soeno, Kounosuke Tomabechi, K Inoue, T Ichikawa, Keizo Umegaki, S Ikegami |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Adult
medicine.medical_specialty Lymphocyte medicine.medical_treatment Medicine (miscellaneous) Ascorbic Acid beta-Carotene Internal medicine medicine Humans Vitamin E Lymphocytes Inverse correlation Vitamin A Micronuclei Chromosome-Defective Nutrition and Dietetics Chemistry Carotene X-ray DNA Ascorbic acid beta Carotene Carotenoids Endocrinology medicine.anatomical_structure Biochemistry Micronucleus test Female Micronucleus DNA Damage |
| Zdroj: | The American journal of clinical nutrition. 59(2) |
| ISSN: | 0002-9165 |
| Popis: | The effects of beta-carotene and ascorbic acid on spontaneous and x-ray-induced appearance of micronuclei (MNs) in human lymphocytes were studied. For 12 d, three groups of healthy volunteers were given beta-carotene-deficient meals containing 100 mg ascorbic acid. There was no supplementation in the first 6 d but, in the last 6 d, the respective groups were given beta-carotene (30 mg), ascorbic acid (300 mg), or placebo. Blood samples were drawn on days 7 and 13 before breakfast, exposed either to x-ray irradiation or left unexposed and were cultured. Lymphocytes containing MNs were then counted. On day 7 the three groups showed comparable MN frequencies. On day 13 lymphocytes containing x-ray-induced MNs became less frequent in the beta-carotene but not the ascorbic acid group. Both before and after the supplementation, the MN frequency of irradiated lymphocytes showed a significant inverse correlation with plasma beta-carotene. These results strongly suggest that beta-carotene protects human lymphocytes from x-ray-induced genetic damage. |
| Databáze: | OpenAIRE |
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