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ISSN Druckformat: 0731-8898
ISSN Online: 2162-6537
IF:
2.4
5-Year IF:
2.8
Immediacy Index:
0.5
Eigenfactor:
0.00049
JCI:
0.59
SJR:
0.429
SNIP:
0.507
CiteScore™::
3.9
H-Index:
49
Indexed in
Modification of Thymocytes Membrane Radiooxidative Damage and Apoptosis by Eugenol
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ABSTRAKT
Radiation-induced membrane oxidative damage, generation of reactive oxygen species (ROS), and cellular apoptosis, as well as their modification by a natural antioxidant from plant source, eugenol, have been investigated in mouse thymocytes.Thymocyte suspension was irradiated by γ-rays, and the malondialdehyde (MDA) formation was measured with the thiobarbituric acid reactive species (TBARS) method. The results showed an increase in MDA in irradiated (2 Gy) thymocytes, which was inhibited in samples treated with increasing concentrations of eugenol (10—200 μM) prior to irradiation. The concentration of eugenol required to inhibit half of the MDA formation (IC50) in irradiated thymocytes was 100 μM. A dose-dependent increase in the generation of ROS was observed in irradiated thymocytes (0.5—200 cGy) as measured by 2,7-dichlorodihydro fluorescein diacetate (DCH-FDA), which was, however, inhibited by eugenol administered before irradiation. Furthermore, experiments showed a significant decrease in thymocytes apoptosis by antioxidant as measured by annexin-V labeling protocol. The inhibition of apoptosis by membrane-localized antioxidants such as eugenol, isoeugenol, and α-tocopherol acetate was more effective than a cytosolic antioxidant such as ascorbic acid. The results suggest an effective prevention of membrane and cellular damage in irradiated thymocytes by eugenol. It is inferred that damage to membrane played a significant role in radiation-induced cellular apoptotic death, which was markedly modified by membrane-specific antioxidants.
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