AIM：To study the relationship between the expression of Fas/FasL protein and apoptosis in rats after renal ischemia/reperfusion.METHODS:Establish the models of renal ischemia/reperfusion injury in rat and SABC immuno...AIM：To study the relationship between the expression of Fas/FasL protein and apoptosis in rats after renal ischemia/reperfusion.METHODS:Establish the models of renal ischemia/reperfusion injury in rat and SABC immunohistochemical methods were used to detect the changes of expression of Fas/FasL protein.Pathomorphological changes in renal ischemia/reparfusion injury were observed.RESULTS:The expression of Fas/FasL proteins was negative in the sham operated group.Fas/FasL proteins were increased in renal in ischemia/reperfusion group,and gradually upregulated with the duration of ischemia or reperfusion and peaked at 72h of reperfusion.The expression of Fas/FasL proteins was stronger in 60min ischemia group than 30min ischemia group and they were mainly expressed in renal tubule.We observed local necrosis and inflammatory cells infiltration around infracted areain ischemia/reperfusion group by HE dyeing methods.And the necrosis area was mainly occurred around proximal convoluted tubule.CONCLUSIONS:These findings suggested that Fas/FasL proteins were over expressed after ischemia/reperfusion injury in rats renal.And Fas/FasL system was involved in the process of renal ischemia/reperfusion injury.展开更多
AIM To study the expression of Fas and Bcl 2 proteins in BEL 7404 human hepatoma cells in order to analyze the possible relationship between cell growth regulation by alpha fetoprotein(AFP) and Fas/Bcl 2 prot...AIM To study the expression of Fas and Bcl 2 proteins in BEL 7404 human hepatoma cells in order to analyze the possible relationship between cell growth regulation by alpha fetoprotein(AFP) and Fas/Bcl 2 proteins. METHODS BEL 7404 human hepatoma cells were maintained in RPMI 1640 medium supplemented with 10% new born calf serum. Cells adhered to coverslips were used to detect Fas and Bcl 2 protein expression by the avidin biotin complex (ABC) immunocytochemical assay. RESULTS Immunocytochemical study showed that essentially all the BEL 7404 human hepatoma cells could express Fas and Bcl 2 proteins, although in various amounts. No positive staining for Fas and Bcl 2 proteins was observed when cells were incubated with non relevant sera to establish the specificity. CONCLUSION Fas apoptosis signals and Bcl 2 rescue/survival signals from apoptosis are expressed in BEL 7404 human hepatoma cells. The finding strongly implys that AFP mediated cell apoptosis and growth enhancement are potentially associated with Fas and Bcl 2 proteins present in those cells.展开更多
Objective: To investigate the expression of Fas ligand in human colon carcinoma cell lines. Methods: A total of six human colon cancer cell lines were examined for the expression of Fas ligand mRNA and cell surface pr...Objective: To investigate the expression of Fas ligand in human colon carcinoma cell lines. Methods: A total of six human colon cancer cell lines were examined for the expression of Fas ligand mRNA and cell surface protein by using RT-PCR and flow cytometry respectively. Results: The results showed that Fas ligand mRNA was expressed in all of the six cancer cell lines and Fas ligand cell surface protein was expressed in part of them. Conclusion: These data suggest that Fas ligand was expressed, at least in part, in human colon cancer cell lines and might facilitate to escape from immune surveillance of the host.展开更多
AIM: To investigate the relationship between Fas gene expression and calcium influx change in peroxide-induced apoptotic hepatocytes and the possible molecular mechanism of Rxa in protecting hepatocytes.METHODS: Singl...AIM: To investigate the relationship between Fas gene expression and calcium influx change in peroxide-induced apoptotic hepatocytes and the possible molecular mechanism of Rxa in protecting hepatocytes.METHODS: Single-cell Fas mRNA expression in H2O2-exposed L02 hepatocytes with or without treatment of Rxa,an extract from an anti-peroxidant, Radix Salviae Miltiorrhizae,was determined by all-cell patch clamp and single-cell reverse transcriptase polymerase chain reaction (RT-PCR). Transient calcium influx change ([Ca2+]i) in the cells was evaluated with all-cell patch clamp micro-fluorescence single-cytosolic free Ca2+ concentration technique. Fas protein expression, early apoptotic index (annexin-V+) and cell membrane change inthe cells were evaluated by immunohistochemistry, flow cytometry (FCM) and scan electron microscopy respectively.RESULTS: In cells exposed to H2O2 for 2 h, the specific lane for Fas mRNA was vivid on electrophoresis, with increased Fas protein expression, [Ca2+]i (from 143.66±34.21 to 1115.28±227.16), annexin-V+ index (from 4.00±0.79 to 16.18±0.72) and membrane vesicle formation. However, in cells exposed to H2O2 but pre-treated with Rxa, there was no increase in Fas mRNA or protein expression and [Ca2+]i (103.56±28.92). Annexin-V+ index (8.92±1.44) was lower than the controls (P＜0.01), and the cell membrane was intact.CONCLUSION: H2O2 induces apoptosis of L02 cells by increasing cytosolic [Ca2+]i, and inducing Fas mRNA and protein expression. Rxa protects the L02 cells from apoptosis through anti-peroxidation, inhibition of calcium overloading and prevention of the activation of cytosolic Fas signal pathway.展开更多
目的探讨槲皮素对多柔比星致乳大鼠心肌细胞损伤的保护作用及机制。方法原代培养乳大鼠心肌细胞,随机分为正常对照组、多柔比星1.72μmol·L-1损伤组和多柔比星+槲皮素25,50及100μmol·L-1组。槲皮素与心肌细胞培养3h后,加入...目的探讨槲皮素对多柔比星致乳大鼠心肌细胞损伤的保护作用及机制。方法原代培养乳大鼠心肌细胞,随机分为正常对照组、多柔比星1.72μmol·L-1损伤组和多柔比星+槲皮素25,50及100μmol·L-1组。槲皮素与心肌细胞培养3h后,加入多柔比星继续培养24h,正常对照组仅加等量DMEM培养液。倒置显微镜下观察细胞生长状态,比色法检测培养液中谷胱甘肽过氧化物酶(GSH-Px)和超氧化物歧化酶(SOD)的活性,用RT-PCR和Western印迹法检测Fas和FasL的mRNA和蛋白的表达。结果与正常对照组相比,多柔比星损伤组心肌细胞生长状态差,GSH-Px和SOD的活性降低,Fas和FasL的mRNA和蛋白的表达均升高。槲皮素25,50及100μmo·lL-1均可拮抗多柔比星所致的上述变化:GSH-Px分别为(76±3),(73±4),(71±3)vs(69±3)kU·L-1;SOD活性分别为(31±2),(29±2),(29±2)vs(26±2)kU.L-1;Fas mRNA:0.61±0.11,1.04±0.12,1.29±0.11 vs 1.61±0.16;FasL mRNA:0.81±0.07,1.24±0.10,1.57±0.09vs1.79±0.11;Fas蛋白:1.08±0.12,1.54±0.10,1.89±0.11 vs 2.15±0.15;FasL蛋白:1.51±0.08,1.70±0.12,2.20±0.09 vs 2.41±0.26。结论槲皮素可减轻多柔比星致乳大鼠心肌细胞凋亡,Fas和FasL蛋白表达的减少是其可能机制之一。展开更多
文摘AIM：To study the relationship between the expression of Fas/FasL protein and apoptosis in rats after renal ischemia/reperfusion.METHODS:Establish the models of renal ischemia/reperfusion injury in rat and SABC immunohistochemical methods were used to detect the changes of expression of Fas/FasL protein.Pathomorphological changes in renal ischemia/reparfusion injury were observed.RESULTS:The expression of Fas/FasL proteins was negative in the sham operated group.Fas/FasL proteins were increased in renal in ischemia/reperfusion group,and gradually upregulated with the duration of ischemia or reperfusion and peaked at 72h of reperfusion.The expression of Fas/FasL proteins was stronger in 60min ischemia group than 30min ischemia group and they were mainly expressed in renal tubule.We observed local necrosis and inflammatory cells infiltration around infracted areain ischemia/reperfusion group by HE dyeing methods.And the necrosis area was mainly occurred around proximal convoluted tubule.CONCLUSIONS:These findings suggested that Fas/FasL proteins were over expressed after ischemia/reperfusion injury in rats renal.And Fas/FasL system was involved in the process of renal ischemia/reperfusion injury.
文摘AIM To study the expression of Fas and Bcl 2 proteins in BEL 7404 human hepatoma cells in order to analyze the possible relationship between cell growth regulation by alpha fetoprotein(AFP) and Fas/Bcl 2 proteins. METHODS BEL 7404 human hepatoma cells were maintained in RPMI 1640 medium supplemented with 10% new born calf serum. Cells adhered to coverslips were used to detect Fas and Bcl 2 protein expression by the avidin biotin complex (ABC) immunocytochemical assay. RESULTS Immunocytochemical study showed that essentially all the BEL 7404 human hepatoma cells could express Fas and Bcl 2 proteins, although in various amounts. No positive staining for Fas and Bcl 2 proteins was observed when cells were incubated with non relevant sera to establish the specificity. CONCLUSION Fas apoptosis signals and Bcl 2 rescue/survival signals from apoptosis are expressed in BEL 7404 human hepatoma cells. The finding strongly implys that AFP mediated cell apoptosis and growth enhancement are potentially associated with Fas and Bcl 2 proteins present in those cells.
基金This work was supported by the National Natural Science Foundation of China (No. 39900143)
文摘Objective: To investigate the expression of Fas ligand in human colon carcinoma cell lines. Methods: A total of six human colon cancer cell lines were examined for the expression of Fas ligand mRNA and cell surface protein by using RT-PCR and flow cytometry respectively. Results: The results showed that Fas ligand mRNA was expressed in all of the six cancer cell lines and Fas ligand cell surface protein was expressed in part of them. Conclusion: These data suggest that Fas ligand was expressed, at least in part, in human colon cancer cell lines and might facilitate to escape from immune surveillance of the host.
基金Supported by National Natural Science Fundation of China, No.39770938Whole Army Medical Scientific Research Task during the Fifteen the Five-year Plan, No. 01MA040
文摘AIM: To investigate the relationship between Fas gene expression and calcium influx change in peroxide-induced apoptotic hepatocytes and the possible molecular mechanism of Rxa in protecting hepatocytes.METHODS: Single-cell Fas mRNA expression in H2O2-exposed L02 hepatocytes with or without treatment of Rxa,an extract from an anti-peroxidant, Radix Salviae Miltiorrhizae,was determined by all-cell patch clamp and single-cell reverse transcriptase polymerase chain reaction (RT-PCR). Transient calcium influx change ([Ca2+]i) in the cells was evaluated with all-cell patch clamp micro-fluorescence single-cytosolic free Ca2+ concentration technique. Fas protein expression, early apoptotic index (annexin-V+) and cell membrane change inthe cells were evaluated by immunohistochemistry, flow cytometry (FCM) and scan electron microscopy respectively.RESULTS: In cells exposed to H2O2 for 2 h, the specific lane for Fas mRNA was vivid on electrophoresis, with increased Fas protein expression, [Ca2+]i (from 143.66±34.21 to 1115.28±227.16), annexin-V+ index (from 4.00±0.79 to 16.18±0.72) and membrane vesicle formation. However, in cells exposed to H2O2 but pre-treated with Rxa, there was no increase in Fas mRNA or protein expression and [Ca2+]i (103.56±28.92). Annexin-V+ index (8.92±1.44) was lower than the controls (P＜0.01), and the cell membrane was intact.CONCLUSION: H2O2 induces apoptosis of L02 cells by increasing cytosolic [Ca2+]i, and inducing Fas mRNA and protein expression. Rxa protects the L02 cells from apoptosis through anti-peroxidation, inhibition of calcium overloading and prevention of the activation of cytosolic Fas signal pathway.
文摘目的探讨槲皮素对多柔比星致乳大鼠心肌细胞损伤的保护作用及机制。方法原代培养乳大鼠心肌细胞,随机分为正常对照组、多柔比星1.72μmol·L-1损伤组和多柔比星+槲皮素25,50及100μmol·L-1组。槲皮素与心肌细胞培养3h后,加入多柔比星继续培养24h,正常对照组仅加等量DMEM培养液。倒置显微镜下观察细胞生长状态,比色法检测培养液中谷胱甘肽过氧化物酶(GSH-Px)和超氧化物歧化酶(SOD)的活性,用RT-PCR和Western印迹法检测Fas和FasL的mRNA和蛋白的表达。结果与正常对照组相比,多柔比星损伤组心肌细胞生长状态差,GSH-Px和SOD的活性降低,Fas和FasL的mRNA和蛋白的表达均升高。槲皮素25,50及100μmo·lL-1均可拮抗多柔比星所致的上述变化:GSH-Px分别为(76±3),(73±4),(71±3)vs(69±3)kU·L-1;SOD活性分别为(31±2),(29±2),(29±2)vs(26±2)kU.L-1;Fas mRNA:0.61±0.11,1.04±0.12,1.29±0.11 vs 1.61±0.16;FasL mRNA:0.81±0.07,1.24±0.10,1.57±0.09vs1.79±0.11;Fas蛋白:1.08±0.12,1.54±0.10,1.89±0.11 vs 2.15±0.15;FasL蛋白:1.51±0.08,1.70±0.12,2.20±0.09 vs 2.41±0.26。结论槲皮素可减轻多柔比星致乳大鼠心肌细胞凋亡,Fas和FasL蛋白表达的减少是其可能机制之一。
