Reactive oxygen species (ROS), represented by superoxide, hydrogen peroxide and hydroxyl radicals, have been implicated in many diseases including cancer. ROS have been known to play an important role in the initiation and promotion of multistep carcinogenesis. The cellular antioxidants play a crucial role in protection against neoplastic disease. However, very little is known about the antioxidant defense in cervical carcinoma. This is addressed in the present study. Lipid peroxides, glutathione content and the activities of antioxidant enzymes, together with vitamin C and E content, were estimated in patients who had carcinoma of the cervix, and the values were compared with those of normal women. The results showed a remarkable reduction in the content of glutathione, vitamin E and C. Activities of glutathione peroxidase and superoxide dismutase were also reduced in cervical cancer compared to normal controls (P < 0.001). This reduction was more marked in late stages (III, IV) than in early stages (I, II) (P < 0.001). Glutathione was reduced more in poorly differentiated tumors (grade III) than in well and moderately differentiated ones (grade I, II) (P < 0.05). Levels of lipid peroxides were found to be significantly higher in malignant than in normal tissue samples and their levels were correlated with advanced clinical stage (P < 0.001). Our results suggest impaired antioxidant status in carcinoma of the cervix. This impairment is related to tumor progression. 相似文献
To observe the effects of ligustrazin on the contents of ATPase, GSH-Px, MDA in stomach and intestine of severely burned rats. *Divide the rats randomly into three groups. Tissue of stomach and intestine were gathered and homogenized respectively, and contents of MDA, LDH, GSH-Px, SOD and ATPase were assayed. The contents of GSH-Px, SOD and ATPase in stomach and intestine were progressively decreased while MDA and LDH obviously enhanced in comparison with that of normal group. After the treatment with ligustrazin, the contents of GSH- Px, SOD and ATPase were significantly higher but MDA and LDH lower than that of non - treated burned group. So ligustrazin have protective effects on stomach and intestine in burned rots. It reduces free radical and has antioxidant effect on stomach and intestine. 相似文献
Objectives: Evaluation of glutathione (GSH) system in different tumors to reveal its potential usefulness in a clinical setting.
Design and methods: In addition to 10 normal controls, blood and tissue samples (85 benign and 109 malignant) from patients with breast, ovarian, prostatic, and liver neoplasms were investigated. The GSH concentration, glutathione S-transferase, glutathione peroxidase, and glutathione reductase activities were biochemically measured.
Results: Whereas all the components of the GSH system increased in patients with breast tumors, few components were significantly changed in patients with malignant ovarian, prostatic as well as metastatic liver diseases. GSH had the highest Z scores in ovarian and breast tumors. It was correlated (p < 0.05) with both glutathione S-transferase, glutathione peroxidase in breast cancer and with glutathione S-transferase only in prostate cancer. No correlation could be found in the expression of the GSH system in the blood and tissues of the same group of patients.
Conclusion: This work revealed that measurement of some and/or all components of the GSH system might be of clinical value in some malignant cases. 相似文献