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Early side effects on normal tissue of radiotherapy for head and neck cancers correlation with activities of free radical scavenging enzymes

机译:头颈癌放疗对正常组织的早期副作用与自由基清除酶活性的关系

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Early side effects of radiation therapy seem to be a major limiting factor in treatment intensification for head and neck cancers. Correlations between the activity of Cu,Zn-superoxide dismutase (SOD), gluthatione peroxidase (GPX), gluthatione transferase (GST); the concentration of malonyldialdehyde (MDA), 7-ketocholesterol, and the severity of early mucosal radiation damage were studied in 90 patients treated with radical radiotherapy. Mucosal reactions were scored according to the Dische scale. Enzymatic activities were studied in erythrocytes, and concentrations of lipid oxidation were measured in blood plasma. The mean Cu,Zn-SOD activity before treatment was 947 U/g Hb, mean GPX activity 21 U/g Hb, MDA concentration in plasma 4.2 μg/l, MDA concentration in erythrocytes 0.19 μg/g Hb, and 7-ketocholesterol concentration 228 μg/l. Only gluthatione peroxidase (r=0.54) and gluthatione peroxidase/superoxide dismutase activity ratio (r=0.52) correlated with the severity of clinically observed early radiation damage. As a wide spectrum of the enzymatic activities was observed for the same level of normal tissue injury, it is not possible to predict the clinical radiosensitivity of individual patients from the estimation of the free radical enzymatic scavenging activity.
机译:放射治疗的早期副作用似乎是头颈癌治疗强化的主要限制因素。铜锌超氧化物歧化酶(SOD),谷胱甘肽过氧化物酶(GPX),谷胱甘肽转移酶(GST)活性之间的相关性;研究了90例接受放射治疗的患者的丙二醛(MDA),7-酮胆固醇浓度和早期粘膜放射损伤的严重程度。根据Dische量表对粘膜反应进行评分。研究了红细胞中的酶活性,并测定了血浆中脂质氧化的浓度。治疗前的平均Cu,Zn-SOD活性为947 U / g Hb,平均GPX活性为21 U / g Hb,血浆中MDA浓度为4.2μg/ l,红细胞中MDA浓度为0.19μg/ g Hb和7-酮胆固醇浓度228微克/升。只有谷胱甘肽过氧化物酶(r = 0.54)和谷胱甘肽过氧化物酶/超氧化物歧化酶活性比(r = 0.52)与临床观察到的早期放射损伤的严重程度相关。由于在相同水平的正常组织损伤中观察到了广泛的酶活性,因此无法通过估计自由基酶清除活性来预测个别患者的临床放射敏感性。

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