Objective： To study the combined antitumor effect and possible mechanisms of ursolic acid with 5-fluorouracil （5-FU） on human esophageal carcinoma cell Eca-109 in vitro. Methods： Eca-109 cells were treated with ur...Objective： To study the combined antitumor effect and possible mechanisms of ursolic acid with 5-fluorouracil （5-FU） on human esophageal carcinoma cell Eca-109 in vitro. Methods： Eca-109 cells were treated with ursolic acid （10-50 μmol/L） and/or 5-fluorouracil （48.0-768.8 μmol/L） for 48 h in vitro. And then cell proliferation was determined by MTT assay. Cell cycle and apoptosis rate were analyzed by flow cytometry （FCM）. The morphological changes of apoptosis were observed by fluorescent microscopy. At last the expression of P27kipl, bcl-2 and bax were detected by western blot. Results： Results： In comparison with single agent treatment, the combination of ursolic acid and 5-fluorouracil produced greater efficacy in growth inhibition, cell cycle arrest at G0/G1 phase, and apoptosis induction （P〈0.05）. Western blot analysis showed that the combination use of ursolic acid and 5-fluorouracil suppressed the expression of bcl-2 and increased the expressions of bax and P27kip1. Conclusion： Ursolic acid combined with 5-fluorouracil showed adjuvant antiproliferative effects on human esophageal carcinoma cell Eca-109 in vitro, which mainly due to the induction of cell cycle arrest as well as apoptosis.展开更多
AIM: To investigate the effects of 8-Br-cAMP on differentiation and apoptosis of human esophageal cancer cell line Eca-109, and the related gene expression.METHODS: The cultured Eca-109 cells were divided into four gr...AIM: To investigate the effects of 8-Br-cAMP on differentiation and apoptosis of human esophageal cancer cell line Eca-109, and the related gene expression.METHODS: The cultured Eca-109 cells were divided into four groups: E1 group (co-cultured with 8-Br-cAMP for 24 h); E2 group (co-cultured with 8-Br-cAMP for 48 h); C1 group (treated without 8-Br-cAMP for 24 h); and C2 group (treated without 8-Br-cAMP for 48 h). The same concentration of cell suspension of each group was dropped separately onto the slides and nitrocellulose membranes (NCM). The biotin-labeled cDNA probes for c-myc, wild-type (wt) p53, bcl-2 and iNOS were prepared for in situ hybridization. The expressions of epidermal growth factor receptor (EGFR), p38 kinase, FAS, FasL and caspase-3 were detected using immunocytochemistry, and the NOS activity and the ratio of differentiated cells/proliferating cells were examined by cytochemistry. Immunocytochemistry, cytochemistry,and in situ hybridization were separately carried out on both slides and NCM specimens for each group. In addition, TUNEL was used to detect the cell apoptosis rate in each group.RESULTS: The apoptotic rate of E2 group was significantly higher compared to E1 group, while there was no difference in the ratio of differentiated cells/ proliferating cells between E1 and E2 groups. The signals of wt p53 and iNOS were markedly stronger, while the signals of c-myc and EGFR were obviously weaker in E1 group than those in C1 group (P＜0.05). Moreover, the signals of wt p53, iNOS, p38 kinase, caspase-3 and NOS activity were significantly stronger, whereas, the signals of bcl-2, c-myc and Fas/FasL were markedly weaker in E2 group than those in C2 group (P＜0.05). CONCLUSION: The differentiation and apoptosis of human esophageal cancer cell Eca-109 can be induced after 24- and 48-h treatment with 8-BrcAMP, respectively. Upregulation of wt p53, iNOS and downregulation of c-myc may be associated with differentiation and apoptosis of Eca-109 cells.Furthermore, upregulation of FasL, p38 kinase and caspase-3 as well as downregulation of bcl-2, and Fas may be involved in the apoptosis of Eca-109 cells.展开更多
BACKGROUND The poor prognosis and rising incidence of esophageal cancer highlight the need for improved therapeutics that are essential prior to treatment.LCL161 is an SMAC(second mitochondrial activator of caspases)m...BACKGROUND The poor prognosis and rising incidence of esophageal cancer highlight the need for improved therapeutics that are essential prior to treatment.LCL161 is an SMAC(second mitochondrial activator of caspases)mimic and inhibitor of apoptosis protein(IAP)antagonist which exhibits anti-tumor effects and improves the chemical sensitivity of many cancers.AIM To ascertain the effects and mechanisms of the SMAC analog LCL161 on esophageal cancer cells.METHODS MTT assay and TUNEL assay were used to detect cell proliferation and apoptosis,respectively.Western blot analysis was used to study the molecular mechanisms of LCL161-induced death of ECA109 cells.RESULTS LCL161 decreased ECA109 cell proliferation in dose-and time-dependent manner and induced apoptosis of ECA109 cells in a dose-dependent manner.Also,LCL161 induced a significant decrease in the expression of the XIAP and significant increase in the expression of Caspase-3.In addition,Bax increased significantly with increasing concentrations of LCL161,and the relative expression of Bax was significantly different between groups.CONCLUSION These findings support the hypothesis that LCL161 can inhibit proliferation and induce apoptosis in esophageal cancer cells by regulating the expression of IAP family members,suggesting that it has potential to be an effective treatment for esophageal squamous cell carcinoma.展开更多
目的通过观察用药后COX-2、Bcl-2和Survivin的变化,探讨丹皮酚(paeonol,Pae)诱导Eca-109食管癌裸鼠移植瘤凋亡的机制。方法体外培养食管癌Eca-109细胞,裸鼠皮下接种Eca-109细胞建立裸鼠移植瘤动物模型,36只荷瘤裸鼠随机分为6组,分别为...目的通过观察用药后COX-2、Bcl-2和Survivin的变化,探讨丹皮酚(paeonol,Pae)诱导Eca-109食管癌裸鼠移植瘤凋亡的机制。方法体外培养食管癌Eca-109细胞,裸鼠皮下接种Eca-109细胞建立裸鼠移植瘤动物模型,36只荷瘤裸鼠随机分为6组,分别为模型对照组、Pae不同剂量组(25、50、100、200mg·kg-1)和阳性药对照组(cisplatin,CD-DP,5mg·kg-1)。治疗2wk后处死裸鼠,剥取瘤体称瘤重并计算抑瘤率。用末端脱氧核苷酸转移酶介导的dUTP缺口末端标记(TUNEL)法检测肿瘤细胞凋亡。免疫组化S-P法检测移植瘤组织COX-2、Bcl-2和Survivin的表达。结果Pae50、100和200mg·kg-1组和CDDP5mg·kg-1组均能明显抑制裸鼠皮下肿瘤的生长,抑瘤率分别为23·54%、27·91%、34·46%和58·71%,与模型组比较差异均有显著性(P<0·05orP<0·01)。TUNEL染色可发现棕褐色的凋亡细胞呈散在或片状分布,Pae各剂量组的凋亡指数(apoptosis index,AI)分别为(11·02±2·58)%、(19·80±2·77)%、(24·48±4·35)%和(27·13±4·39)%,与模型组(4·81±0·83)%比较,差异均有显著性(P<0·05orP<0·01)。免疫组化结果显示,Pae能明显抑制移植瘤组织COX-2、Bcl-2和Survivin的表达(P<0·05 or P<0·01)。结论Pae能抑制Eca-109食管癌裸鼠移植瘤生长、诱导凋亡而发挥抗肿瘤作用,其机制可能与下调COX-2的表达并抑制Bcl-2和Sur-vivin的表达有关。展开更多
基金supported by the grants from the Natural science Foundation Project of Chongqing Sci & Tech Committee (CSCT, 2006BB5297)
文摘Objective： To study the combined antitumor effect and possible mechanisms of ursolic acid with 5-fluorouracil （5-FU） on human esophageal carcinoma cell Eca-109 in vitro. Methods： Eca-109 cells were treated with ursolic acid （10-50 μmol/L） and/or 5-fluorouracil （48.0-768.8 μmol/L） for 48 h in vitro. And then cell proliferation was determined by MTT assay. Cell cycle and apoptosis rate were analyzed by flow cytometry （FCM）. The morphological changes of apoptosis were observed by fluorescent microscopy. At last the expression of P27kipl, bcl-2 and bax were detected by western blot. Results： Results： In comparison with single agent treatment, the combination of ursolic acid and 5-fluorouracil produced greater efficacy in growth inhibition, cell cycle arrest at G0/G1 phase, and apoptosis induction （P〈0.05）. Western blot analysis showed that the combination use of ursolic acid and 5-fluorouracil suppressed the expression of bcl-2 and increased the expressions of bax and P27kip1. Conclusion： Ursolic acid combined with 5-fluorouracil showed adjuvant antiproliferative effects on human esophageal carcinoma cell Eca-109 in vitro, which mainly due to the induction of cell cycle arrest as well as apoptosis.
基金Supported by the Research Science Foundation of Henan Province, No. 2000180007
文摘AIM: To investigate the effects of 8-Br-cAMP on differentiation and apoptosis of human esophageal cancer cell line Eca-109, and the related gene expression.METHODS: The cultured Eca-109 cells were divided into four groups: E1 group (co-cultured with 8-Br-cAMP for 24 h); E2 group (co-cultured with 8-Br-cAMP for 48 h); C1 group (treated without 8-Br-cAMP for 24 h); and C2 group (treated without 8-Br-cAMP for 48 h). The same concentration of cell suspension of each group was dropped separately onto the slides and nitrocellulose membranes (NCM). The biotin-labeled cDNA probes for c-myc, wild-type (wt) p53, bcl-2 and iNOS were prepared for in situ hybridization. The expressions of epidermal growth factor receptor (EGFR), p38 kinase, FAS, FasL and caspase-3 were detected using immunocytochemistry, and the NOS activity and the ratio of differentiated cells/proliferating cells were examined by cytochemistry. Immunocytochemistry, cytochemistry,and in situ hybridization were separately carried out on both slides and NCM specimens for each group. In addition, TUNEL was used to detect the cell apoptosis rate in each group.RESULTS: The apoptotic rate of E2 group was significantly higher compared to E1 group, while there was no difference in the ratio of differentiated cells/ proliferating cells between E1 and E2 groups. The signals of wt p53 and iNOS were markedly stronger, while the signals of c-myc and EGFR were obviously weaker in E1 group than those in C1 group (P＜0.05). Moreover, the signals of wt p53, iNOS, p38 kinase, caspase-3 and NOS activity were significantly stronger, whereas, the signals of bcl-2, c-myc and Fas/FasL were markedly weaker in E2 group than those in C2 group (P＜0.05). CONCLUSION: The differentiation and apoptosis of human esophageal cancer cell Eca-109 can be induced after 24- and 48-h treatment with 8-BrcAMP, respectively. Upregulation of wt p53, iNOS and downregulation of c-myc may be associated with differentiation and apoptosis of Eca-109 cells.Furthermore, upregulation of FasL, p38 kinase and caspase-3 as well as downregulation of bcl-2, and Fas may be involved in the apoptosis of Eca-109 cells.
文摘BACKGROUND The poor prognosis and rising incidence of esophageal cancer highlight the need for improved therapeutics that are essential prior to treatment.LCL161 is an SMAC(second mitochondrial activator of caspases)mimic and inhibitor of apoptosis protein(IAP)antagonist which exhibits anti-tumor effects and improves the chemical sensitivity of many cancers.AIM To ascertain the effects and mechanisms of the SMAC analog LCL161 on esophageal cancer cells.METHODS MTT assay and TUNEL assay were used to detect cell proliferation and apoptosis,respectively.Western blot analysis was used to study the molecular mechanisms of LCL161-induced death of ECA109 cells.RESULTS LCL161 decreased ECA109 cell proliferation in dose-and time-dependent manner and induced apoptosis of ECA109 cells in a dose-dependent manner.Also,LCL161 induced a significant decrease in the expression of the XIAP and significant increase in the expression of Caspase-3.In addition,Bax increased significantly with increasing concentrations of LCL161,and the relative expression of Bax was significantly different between groups.CONCLUSION These findings support the hypothesis that LCL161 can inhibit proliferation and induce apoptosis in esophageal cancer cells by regulating the expression of IAP family members,suggesting that it has potential to be an effective treatment for esophageal squamous cell carcinoma.
文摘目的通过观察用药后COX-2、Bcl-2和Survivin的变化,探讨丹皮酚(paeonol,Pae)诱导Eca-109食管癌裸鼠移植瘤凋亡的机制。方法体外培养食管癌Eca-109细胞,裸鼠皮下接种Eca-109细胞建立裸鼠移植瘤动物模型,36只荷瘤裸鼠随机分为6组,分别为模型对照组、Pae不同剂量组(25、50、100、200mg·kg-1)和阳性药对照组(cisplatin,CD-DP,5mg·kg-1)。治疗2wk后处死裸鼠,剥取瘤体称瘤重并计算抑瘤率。用末端脱氧核苷酸转移酶介导的dUTP缺口末端标记(TUNEL)法检测肿瘤细胞凋亡。免疫组化S-P法检测移植瘤组织COX-2、Bcl-2和Survivin的表达。结果Pae50、100和200mg·kg-1组和CDDP5mg·kg-1组均能明显抑制裸鼠皮下肿瘤的生长,抑瘤率分别为23·54%、27·91%、34·46%和58·71%,与模型组比较差异均有显著性(P<0·05orP<0·01)。TUNEL染色可发现棕褐色的凋亡细胞呈散在或片状分布,Pae各剂量组的凋亡指数(apoptosis index,AI)分别为(11·02±2·58)%、(19·80±2·77)%、(24·48±4·35)%和(27·13±4·39)%,与模型组(4·81±0·83)%比较,差异均有显著性(P<0·05orP<0·01)。免疫组化结果显示,Pae能明显抑制移植瘤组织COX-2、Bcl-2和Survivin的表达(P<0·05 or P<0·01)。结论Pae能抑制Eca-109食管癌裸鼠移植瘤生长、诱导凋亡而发挥抗肿瘤作用,其机制可能与下调COX-2的表达并抑制Bcl-2和Sur-vivin的表达有关。
