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Whole-body irradiation of \u03b3-rays (6 Gy) given to animals reduced the white blood cell count, bone marrow cellularity and \u03b1-esterase positive cells in control animals, which were elevated by the administration of V. cinerea extract (20 mg\/kg body weight [b.wt.], intraperitoneally [i.p.]). The elevated levels of serum enzymes alkaline phosphatase (ALP), glutamate pyruvate transferases (GPT) and lipid peroxidation (LPO) after irradiation were also reduced with V. cineria extract administration. V. cinerea treatment also significantly enhanced the animal\u2019s antioxidant status by enhancing the activities superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and reduced glutathione (GSH) level in irradiated animals. Histopathological analysis of liver and small intestine also suggests that V. cinerea could reduce the tissue damages induced by radiation. The level of pro-inflammatory cytokines such as interleukin 1\u03b2 (IL-1\u03b2), tumour necrosis factor \u03b1 (TNF-\u03b1) and C-reactive protein (CRP) elevated after irradiation, which were significantly reduced by V. cinerea extract administration. On the other hand, the extract stimulated the production of other cytokines such as granulocyte monocyte\u2014colony stimulating factor (GM-CSF) and interferon-\u03b3 (IFN-\u03b3) in animals exposed to radiation. Agarose gel electrophoresis of DNA isolated from bone marrow of control animals showed heavy DNA damage, but a reduced DNA damage was seen in animals treated with V. cinerea extract. Administration of V. cinerea did not compromise the anti-neoplastic efficiency of radiation. In fact, there was a synergistic action of radiation and V. cinerea in reducing the solid tumours in mice. Methanolic extract of V. cinerea given i.p. showed a significant radioprotective activity without compromising the radiotherapeutic efficacy of radiation, indicating its possible use as an adjuvant during radiotherapy.<\/jats:p>","DOI":"10.1177\/0960327110385959","type":"journal-article","created":{"date-parts":[[2010,10,7]],"date-time":"2010-10-07T20:51:20Z","timestamp":1286484680000},"page":"1022-1038","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":32,"title":["Protective role of Vernonia cinerea L. against gamma radiation\u2014induced immunosupression and oxidative stress in mice"],"prefix":"10.1177","volume":"30","author":[{"given":"P.","family":"Pratheeshkumar","sequence":"first","affiliation":[{"name":"Amala Cancer Research Centre, Amala Nagar, Thrissur, Kerala, 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