AIM: To study the expression of early growth response gene1 (Egr-1 gene) and Bcl-X/L protein and its relationship with the cell apoptosis in human esophageal carcinoma(EC) and precancerous lesions.METHODS: In situ hyb...AIM: To study the expression of early growth response gene1 (Egr-1 gene) and Bcl-X/L protein and its relationship with the cell apoptosis in human esophageal carcinoma(EC) and precancerous lesions.METHODS: In situ hybridization(ISH), immunohistochemistry (IHC) and TUNEL method were used respectively to detect Egr-1mRNA, Egr-1 protein, apoptosis related-protein Bcl-X/L and cell apoptosis in situ from 66 cases of esophageal squamous cell carcinoma and their upper cut edge and paracancerous mucosa.RESULTS: Egr-1 gene in situ hybridization, Bcl-X/L immunohistochemistry positive products were located in the cytoplasm, while Egr-1 immunohistochemistry and TUNEL positive signal were located in the nuclei. The apoptosis index(AI) and the frequency of apoptosis occurrence were increased gradually from precancerous lesion to cancer (P<0.01) and the expression of Egr-1mRNA and Egr-1 protein in dysplasia was the highest among all specimens (P<0.01).The AI of Egr-1 positive cancer tissues was much higher than that of Egr-1 negative cancer tissues (P<0.01), while the AI of Bcl-X/L positive cancer tissues was much lower than that of Bcl-X/L negative cancer tissues (P<0.01). The AI and Egr-1 expression were not correlated with invasiveness and lymphatic metastasis in EC.CONCLUSION: Cell apoptosis was present through esophageal carcinogenesis. The expression of Egr-1 mRNA and Egr-1 protein were high in precancerous lesion of esophagus. The AI was increased significantly in Egr-1 positive squamous cell carcinoma. Egr-1 might promote apoptotic effect. Egr-1 expression and cell apoptosis may have an important biological significance in esophageal carcinogenesis.展开更多
AIM:To examine the expression of Egr-1, c-fos and cyclin D1 at both transcript and protein levels in esophageal carcinoma and to correlate the level of their expressions with precancerous and paracancerous esophageal ...AIM:To examine the expression of Egr-1, c-fos and cyclin D1 at both transcript and protein levels in esophageal carcinoma and to correlate the level of their expressions with precancerous and paracancerous esophageal lesions and esophageal carcinoma.METHODS:In situ hybridization and immunohistochemistry were used respectively to detect the expression of mRNA and proteins of Egr-1, c-fos and cyclin D1 in 70 cases of esophageal squamous cell carcinoma and their corresponding para-cancerous mucosa and upper cut edge mucosa.RESULTS:In situ hybridization and immunohistochemistry showed positive staining of all three mRNAs in the cytoplasm and those of the proteins in nuclei. Overexpression of Egr-1, c-los and cyclin D1 mRNAs and their proteins was found in dysplasia and squamous carcinomas. The expression level of Egr-1 and c-los was high, and cyclin D1 was low in dysplasia mucosa, whereas the expression of Egr-1 was decreased, c-fos was maintained and cyclin D1 was increased in the cancers. The expression of both c-fos and cyclinD1 was consistent between the mRNA and protein in their corresponding high expression lesions.CONCLUSION: The expression of Egr-1, c-fos and cyclin D1 varies in esophageal precancerous lesions and cancer tissues, suggesting an involvement of these genes in the development of esophageal carcinoma.展开更多
This study examined the effects of TRAIL-endostatin-based gene-radiotherapy on cellu-lar growth, apoptosis and cell cycle progression in human vascular endothelial cells ECV304 in vitro. The expression of TRAIL and en...This study examined the effects of TRAIL-endostatin-based gene-radiotherapy on cellu-lar growth, apoptosis and cell cycle progression in human vascular endothelial cells ECV304 in vitro. The expression of TRAIL and endostatin protein in ECV304 cells was detected by ELISA after the transfection of recombinant plasmid pshuttle-Egr1-shTRAIL-shES and X-ray irradiation. Then MTT assay was used for determining the cellular proliferation, and flow cytometry (FCM) plus Annexin V and propidium iodide (PI) double-staining or PI single-staining were employed for the detection of apoptosis and cell cycle progression. The results showed that expression of TRAIL and endostatin protein exhibited a time- and dose-dependent change in ECV304 cells after pshut-tle-Egr1-shTRAIL-shES transfection in conjunction with irradiation. In the TRAIL-endostatin-based single- or double-gene-radiotherapy, the cell viability declined in a time- and dose-dependent manner, the percentage of cells at G2/M phase and apoptotic rate was increased, and the percentage of cells at G0/G1 phase was lowered as compared with those receiving radiotherapy alone. Moreover, TRAIL-endostatin-based double-gene-radiotherapy demonstrated better effects on growth inhibition, promotion of apoptosis and induction of cell cycle arrest in ECV304 cells than single-gene-radiotherapy.展开更多
目的观察IL-13对9HTE气道上皮细胞内Egr-1、Bax、Bcl-2 m RNA和蛋白表达的影响,探讨IL-13在气道上皮细胞凋亡中的作用及机制。方法将9HTE气道上皮细胞分为正常对照组、rh IL-13组及rh IL-13+m AIL-13组,用逆转录-多聚酶链反应(RT-PCR)...目的观察IL-13对9HTE气道上皮细胞内Egr-1、Bax、Bcl-2 m RNA和蛋白表达的影响,探讨IL-13在气道上皮细胞凋亡中的作用及机制。方法将9HTE气道上皮细胞分为正常对照组、rh IL-13组及rh IL-13+m AIL-13组,用逆转录-多聚酶链反应(RT-PCR)法检测Egr-1、Bax、Bcl-2 m RNA表达水平,用免疫细胞化学(ICC)法检测Egr-1、Bax、Bcl-2蛋白表达水平。结果rh IL-13组Egr-1、Bax m RNA及蛋白表达显著高于正常对照组(P<0.01),Bcl-2 m RNA及蛋白表达显著低于正常对照组(P<0.01);rh IL-13+m AIL-13组Egr-1、Bax m RNA及蛋白表达显著低于rh IL-13组(P<0.01),与正常对照组比较无显著性差异(P>0.05),Bcl-2 m RNA及蛋白表达显著高于rh IL-13组(P<0.01),与正常对照组比较无显著性差异(P>0.05)。结论 IL-13可能通过Egr-1促进9HTE气道上皮细胞凋亡;m AIL-13可以中和IL-13所致的9HTE气道上皮细胞凋亡的作用。展开更多
基金the National Natural Science Foundation of China,No.39670298
文摘AIM: To study the expression of early growth response gene1 (Egr-1 gene) and Bcl-X/L protein and its relationship with the cell apoptosis in human esophageal carcinoma(EC) and precancerous lesions.METHODS: In situ hybridization(ISH), immunohistochemistry (IHC) and TUNEL method were used respectively to detect Egr-1mRNA, Egr-1 protein, apoptosis related-protein Bcl-X/L and cell apoptosis in situ from 66 cases of esophageal squamous cell carcinoma and their upper cut edge and paracancerous mucosa.RESULTS: Egr-1 gene in situ hybridization, Bcl-X/L immunohistochemistry positive products were located in the cytoplasm, while Egr-1 immunohistochemistry and TUNEL positive signal were located in the nuclei. The apoptosis index(AI) and the frequency of apoptosis occurrence were increased gradually from precancerous lesion to cancer (P<0.01) and the expression of Egr-1mRNA and Egr-1 protein in dysplasia was the highest among all specimens (P<0.01).The AI of Egr-1 positive cancer tissues was much higher than that of Egr-1 negative cancer tissues (P<0.01), while the AI of Bcl-X/L positive cancer tissues was much lower than that of Bcl-X/L negative cancer tissues (P<0.01). The AI and Egr-1 expression were not correlated with invasiveness and lymphatic metastasis in EC.CONCLUSION: Cell apoptosis was present through esophageal carcinogenesis. The expression of Egr-1 mRNA and Egr-1 protein were high in precancerous lesion of esophagus. The AI was increased significantly in Egr-1 positive squamous cell carcinoma. Egr-1 might promote apoptotic effect. Egr-1 expression and cell apoptosis may have an important biological significance in esophageal carcinogenesis.
基金Supported by the National Natural Science Foundation of China,No.39670298
文摘AIM:To examine the expression of Egr-1, c-fos and cyclin D1 at both transcript and protein levels in esophageal carcinoma and to correlate the level of their expressions with precancerous and paracancerous esophageal lesions and esophageal carcinoma.METHODS:In situ hybridization and immunohistochemistry were used respectively to detect the expression of mRNA and proteins of Egr-1, c-fos and cyclin D1 in 70 cases of esophageal squamous cell carcinoma and their corresponding para-cancerous mucosa and upper cut edge mucosa.RESULTS:In situ hybridization and immunohistochemistry showed positive staining of all three mRNAs in the cytoplasm and those of the proteins in nuclei. Overexpression of Egr-1, c-los and cyclin D1 mRNAs and their proteins was found in dysplasia and squamous carcinomas. The expression level of Egr-1 and c-los was high, and cyclin D1 was low in dysplasia mucosa, whereas the expression of Egr-1 was decreased, c-fos was maintained and cyclin D1 was increased in the cancers. The expression of both c-fos and cyclinD1 was consistent between the mRNA and protein in their corresponding high expression lesions.CONCLUSION: The expression of Egr-1, c-fos and cyclin D1 varies in esophageal precancerous lesions and cancer tissues, suggesting an involvement of these genes in the development of esophageal carcinoma.
基金supported by agrant from the National Natural Science Foundation of China(No.30570546)
文摘This study examined the effects of TRAIL-endostatin-based gene-radiotherapy on cellu-lar growth, apoptosis and cell cycle progression in human vascular endothelial cells ECV304 in vitro. The expression of TRAIL and endostatin protein in ECV304 cells was detected by ELISA after the transfection of recombinant plasmid pshuttle-Egr1-shTRAIL-shES and X-ray irradiation. Then MTT assay was used for determining the cellular proliferation, and flow cytometry (FCM) plus Annexin V and propidium iodide (PI) double-staining or PI single-staining were employed for the detection of apoptosis and cell cycle progression. The results showed that expression of TRAIL and endostatin protein exhibited a time- and dose-dependent change in ECV304 cells after pshut-tle-Egr1-shTRAIL-shES transfection in conjunction with irradiation. In the TRAIL-endostatin-based single- or double-gene-radiotherapy, the cell viability declined in a time- and dose-dependent manner, the percentage of cells at G2/M phase and apoptotic rate was increased, and the percentage of cells at G0/G1 phase was lowered as compared with those receiving radiotherapy alone. Moreover, TRAIL-endostatin-based double-gene-radiotherapy demonstrated better effects on growth inhibition, promotion of apoptosis and induction of cell cycle arrest in ECV304 cells than single-gene-radiotherapy.
文摘目的观察IL-13对9HTE气道上皮细胞内Egr-1、Bax、Bcl-2 m RNA和蛋白表达的影响,探讨IL-13在气道上皮细胞凋亡中的作用及机制。方法将9HTE气道上皮细胞分为正常对照组、rh IL-13组及rh IL-13+m AIL-13组,用逆转录-多聚酶链反应(RT-PCR)法检测Egr-1、Bax、Bcl-2 m RNA表达水平,用免疫细胞化学(ICC)法检测Egr-1、Bax、Bcl-2蛋白表达水平。结果rh IL-13组Egr-1、Bax m RNA及蛋白表达显著高于正常对照组(P<0.01),Bcl-2 m RNA及蛋白表达显著低于正常对照组(P<0.01);rh IL-13+m AIL-13组Egr-1、Bax m RNA及蛋白表达显著低于rh IL-13组(P<0.01),与正常对照组比较无显著性差异(P>0.05),Bcl-2 m RNA及蛋白表达显著高于rh IL-13组(P<0.01),与正常对照组比较无显著性差异(P>0.05)。结论 IL-13可能通过Egr-1促进9HTE气道上皮细胞凋亡;m AIL-13可以中和IL-13所致的9HTE气道上皮细胞凋亡的作用。