Modulation of radiation-induced cytotoxicity in U 87 cells by RH-3 (a preparation of Hippophae rhamnoides).
Article
in English
| IMSEAR
| ID: sea-135935
ABSTRACT
Background & objectives:
Hippophae rhamnoides L. has been widely exploited for medicinal purposes and an extract of its whole berries coded as RH-3 has been found to render radioprotection. Effect of pre-irradiation treatment of up to 10 μg/ml RH-3 was studied in U 87 cells using MTT assay. This study aims at unraveling the mechanism of action of RH-3 in amelioration of radiation-induced cytotoxicity in vitro.Methods:
Most effective doses selected were studied further for the elucidation of radiomodifying properties of RH-3, especially with respect to early and late events of apoptosis.Results:
RH-3 at concentrations of 7.5 and 10 μg/ml (-15 min) were found most effective in protecting against 2 Gy induced cytotoxicity in terms of MTT reducing ability in U 87 cells. RH-3 was observed to mitigate radiation-induced cellular and mitochondrial free radicals. Mitochondrial membrane potential depletion (studied up to 12 h) was prevented by RH-3 pre-irradiation administration. It could also restore the level of antiapoptotic protein Bcl-2 at 24 and 48 h comparable to the control value. RH-3 also prevented radiation-induced increase in mitochondrial mass at 48 and 72 h post-treatment and the values were comparable to that of control cells. Annexin-V-FITC assay at 12 and 24 h time intervals indicated significant protection against radiation-induced apoptosis by RH-3 pre-irradiation treatment. Interpretation &conclusion:
Our findings showed that probably RH-3 acts as an antioxidant preventing cellular and mitochondrial free radical generation that could contribute to its ability to inhibit radiationinduced apoptosis and cytotoxicity.
Full text:
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Index:
IMSEAR (South-East Asia)
Main subject:
Plants, Medicinal
/
Radiation-Protective Agents
/
Humans
/
Plant Extracts
/
Cell Line
/
Cell Survival
/
Apoptosis
/
Hippophae
/
Membrane Potential, Mitochondrial
/
Free Radicals
Language:
English
Year:
2009
Type:
Article
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