RÉSUMÉ
Objective To investigate the effects of H_2O_2 on growth and proliferation in CNE-2Z cells.Methods To identify the effects of H_2O_2 on the growth and proliferation in CNE-2Z cells,Cell growth curves,MTT assay and plate colony formation rate were used;Meanwhile,Cell cycle distribution,proliferation index and apoptosis analysis were performed by flow cytometry(FCM) in human NPC cells CNE-2Z in vitro,before and after the action of H_2O_2;the protein expressions of Egr-1,p53,p16,Cyclin D1 were detected by Western-Blotting analysis.Results There were no EGR-1 and P16 proteins expressions in CNE-2Z cells by Western-Blotting analysis before the action of H2O2;the growth and proliferation of CNE-2Z cells were inhibited significantly by H_2O_2 compared with the control cells,and the apoptosis cells were increased.The increased expressions of EGR-1,P53,and Cyclin D1 protein were also shown in CNE-2Z cells by means of Western-Blotting analysis after the action of H_2O_2;but no P16 protein expression;The expression of EGR-1 protein was significant correlation with P53 protein expression,but no significant correlation with Cyclin D1 protein expression.Conclusion There was no EGR-1 protein expression in CNE-2Z cells,and EGR-1 protein can be induced expression rapidly and transiently by H_2O_2,which probably have an important!role in the growth inhibition and apoptosis.The promotor of Egr-1 gene also can be induced activation by radiation(ROS,reactive oxygen species),there is an important application in therapy of NPC and other tumors.
RÉSUMÉ
Objective The development and progression of intestinal metaplasia ( IM ) and expression of tumor-related proteins in dog’ s stomach were observed. Methods IM animal model was established in Beagle’ s stomach by feeding N-methyl-N’-nitro-N-trosoguanidine( MNNG ),ranitidine,and local X-irradiation. Expression of APC, p53, K-ras and bcl-2 genes in canine gastric lesion were determined by immunohistochemistry. Resullts IM canine model was successfully induced, with which sequential pathology studied. It was proved that progression of normal epithelial cells to IM cells might undergo several stages including superficial gastritis, chronic atrophic gastritis, mild focal IM, moderate,and severe IM.Aberrant bcl-2 protein was detected in atrophic gastric epithelium and abnormal expression of APC, K-ras, and bcl-2 found in IM mucosa. Conclusion Canine gastric IM was induced by the method mentioned above.The development of normal gastric mucosa to IM in dog seemed to resemble that of human being.The presence of tumor-related proteins might indicate the transformation of IM to malignancy.