Modulation of radiation-induced cytotoxicity in U 87 cells by RH-3 (a preparation of Hippophae rhamnoides).

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dc.contributor.authorAgrawala, P K
dc.contributor.authorAdhikari, J S
dc.date.accessioned2011-12-16T06:39:51Z
dc.date.available2011-12-16T06:39:51Z
dc.date.issued2009-11
dc.description.abstractBackground & 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.en_US
dc.identifier.citationAgrawala P K, Adhikari J S. Modulation of radiation-induced cytotoxicity in U 87 cells by RH-3 (a preparation of Hippophae rhamnoides). Indian Journal of Medical Research. 2009 Nov; 130(5): 542-549.en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/135935
dc.language.isoenen_US
dc.source.urihttps://icmr.nic.in/ijmr/2009/November/1108.pdfen_US
dc.subjectApoptosisen_US
dc.subjectflow cytometryen_US
dc.subjectfree radicalsen_US
dc.subjectHippophae rhamnoidesen_US
dc.subjectmitochondriaen_US
dc.subjectradioprotectionen_US
dc.subject.meshAntioxidants --pharmacology
dc.subject.meshApoptosis --drug effects
dc.subject.meshApoptosis --radiation effects
dc.subject.meshCell Line
dc.subject.meshCell Survival --drug effects
dc.subject.meshCell Survival --radiation effects
dc.subject.meshFree Radicals --metabolism
dc.subject.meshGamma Rays --adverse effects
dc.subject.meshHippophae
dc.subject.meshHumans
dc.subject.meshMembrane Potential, Mitochondrial --drug effects
dc.subject.meshMembrane Potential, Mitochondrial --radiation effects
dc.subject.meshPlant Extracts --pharmacology
dc.subject.meshPlants, Medicinal
dc.subject.meshRadiation-Protective Agents --pharmacology
dc.titleModulation of radiation-induced cytotoxicity in U 87 cells by RH-3 (a preparation of Hippophae rhamnoides).en_US
dc.typeArticleen_US
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