Objective：To investigate the cellular effects of Pien Tze Huang（片仔癀,PZH） in the HT-29 human colon carcinoma cell line.Methods：The viability of HT-29 cells was determined by MTT assay.A fluorescence-activated ce...Objective：To investigate the cellular effects of Pien Tze Huang（片仔癀,PZH） in the HT-29 human colon carcinoma cell line.Methods：The viability of HT-29 cells was determined by MTT assay.A fluorescence-activated cell sorting（FACS） analysis with annexin-V/propidium iodide（PI） and JC-1 staining were performed to determine cell apoptosis and the loss of mitochondrial membrane potential,respectively.Activation of caspase 3 was evaluated by a colorimetric assay.The mRNA expression levels of Bcl-2 and Bax were measured by reverse transcription polymerase chain reaction（RT-PCR）.Results：PZH,in a dose- and time-dependent manner,reduced viability and induced apoptosis of HT-29 cells.Moreover,PZH treatment resulted in the collapse of the mitochondrial membrane potential,activation of caspase 3,and an increase in the Bax/Bcl-2 ratio.Conclusion：PZH inhibits the growth of HT-29 cells by inducing cancer cell apoptosis via regulation of the Bcl-2 family and activation of caspase 3,which may,in part,explain its anticancer activity.展开更多
INTRODUCTIONSialyl Lewis-X antigen ,correlated with carcinoma, is a group of carbohydrate antigen containing oligosaccharide expressed of embryonic tisue and glycoproteins on cell surface of embryonic tissue[1].The SL...INTRODUCTIONSialyl Lewis-X antigen ,correlated with carcinoma, is a group of carbohydrate antigen containing oligosaccharide expressed of embryonic tisue and glycoproteins on cell surface of embryonic tissue[1].The SLeX antigen located on cell surface is synthesized principally by two enzymes ,al ,3fucosyltransfrease and a2, 3sialyctransferase.In adults ,SLeX antigen is expressed principally on the surfaces of granulocytic cells and some tumor cells .展开更多
AIM： To investigate the effect of paeonol on controlling the proliferation of colorectal cancer cell line HT-29 and to discuss its possible mechanism. METHODS： The inhibitory effect of paeonol on proliferation of HT...AIM： To investigate the effect of paeonol on controlling the proliferation of colorectal cancer cell line HT-29 and to discuss its possible mechanism. METHODS： The inhibitory effect of paeonol on proliferation of HT-29 cells was detected by M-I-I- assay. The results of apoptosis were measured by flow cytometry. Immunocytochemical staining was performed to detect the expression of cyclooxygenase-2 （COX-2） and protein p27 in HT-29 cells treated with paeonol at different concentrations. Reverse transcription-polymerase chain reaction （RT- PCR） was used for mRNA analysis. RESULTS： From the data of both MTT and flow cytometry, we observed that cell proliferation was inhibited by different concentrations of paeonol. By immunocytochemical staining, we found that HT-29 cells treated with paeonol （0.024-1.504 mmol/L） reflected reduced expression of COX-2 and increased expression of p27 in a dose-dependent manner. RT-PCR showed that paeonol down-regulated COX-2 and up-regulated p27 in a dose- and time-dependent manner in HT-29 cells. CONCLUSION： One of the apoptotic mechanisms of paeonol is down-regulation of COX-2. p27 is upregulated simultaneously and plays an important part in controlling cell proliferation and is a crucial factor in the Fas/FasL apoptosis pathway.展开更多
LIGHT [homologous to lymphotoxins, shows inducible expression, and competes with herpes simplex virus glycoprotein D for herpes virus entry mediator (HVEM/TR2)] is a new member of TNF superfamily. The HT-29 colon canc...LIGHT [homologous to lymphotoxins, shows inducible expression, and competes with herpes simplex virus glycoprotein D for herpes virus entry mediator (HVEM/TR2)] is a new member of TNF superfamily. The HT-29 colon cancer cell line is the most sensitive to LIGHT-induced, IFNγ-mediated apoptosis among the cell lines we have examined so far. Besides downregulation of Bcl-XL, upregulation of Bak, and activation of both PARP [poly (ADP-ribose)polymerase] and DFF45 (DNA fragmentation factor), LIGHT-induced, IFNγ-mediated apoptosis of HT-29 cells involves extensive caspase activation. Caspase-8 and caspase-9 activation, as shown by their cleavages appeared as early as 24 h after treatment, whereas caspase-3 and caspase-7 activation, as shown by their cleavages occurred after 72 h of LIGHT treatment. Caspase-3 inhibitor Z-DEVD-FMK (benzyloxycarbonyl-Asp-Glu-Val-Asp-fluoromethylketone)and a broad range caspase inhibitor Z-VAD-FMK (benzyloxycarbonyl-Val-Ala-Asp fluoromethylketone) were able to block LIGHT-induced, IFNγ-mediated apoptosis of HT-29 cells. The activity of caspase-3, which is one of the major executioner caspases, was found to be inhibited by both Z-DEVD-MFK and Z-VAD-FMK. These results suggest that LIGHT-induced, IFNγ-mediated apoptosis of HT-29 cells is caspase-dependent, and LIGHT signaling is mediated through both death receptor and mitochondria pathways.展开更多
Objective： To investigate the effects of curcumin on release of cytochrome c and expressions of Bcl-2, Bax, Bad, Bcl-xL, caspase-3, poly ADP-ribose polymerase （PARP）, and survivin of HT-29 cells. Methods： HT-29 ce...Objective： To investigate the effects of curcumin on release of cytochrome c and expressions of Bcl-2, Bax, Bad, Bcl-xL, caspase-3, poly ADP-ribose polymerase （PARP）, and survivin of HT-29 cells. Methods： HT-29 cells were treated with curcumin （0-80 μmol/L） for 24 h. The release of cytochrome c from the mitochondria and the apoptosis-related proteins Bax, Bcl-2, Bcl-xL, Bad, caspase-3, PARP, and survivin were determined by Western blot analysis and their mRNA expressions by reverse transcriptase-polymerase chain reaction （RT-PCR）. Results： Curcumin significantly induced the growth inhibition and apoptosis of HT-29 cells. A decrease in expressions of Bcl-2, Bcl-xL and survivin was observed after exposure to 10-80 μmol/L curcumin, while the levels of Bax and Bad increased in the curcumin-treated cells. Curcumin also induced the release of cyto- chrome c, the activation ofcaspase-3, and the cleavage of PARP in a dose-dependent manner. Conclusion： These data suggest that curcumin induced the HT-29 cell apoptosis possibly via the mitoehondria-mediated pathway.展开更多
目的研究苦参碱对结肠癌耐药细胞HT-29/奥沙利铂(Oxaliplatin,OXA)耐药性的逆转作用并探讨其可能的作用机制。方法采用逐步增加药物浓度的方法建立奥沙利铂耐药结肠癌细胞株HT-29/OXA;CCK-8法测定苦参碱对HT-29/OXA细胞的耐药性逆转作用...目的研究苦参碱对结肠癌耐药细胞HT-29/奥沙利铂(Oxaliplatin,OXA)耐药性的逆转作用并探讨其可能的作用机制。方法采用逐步增加药物浓度的方法建立奥沙利铂耐药结肠癌细胞株HT-29/OXA;CCK-8法测定苦参碱对HT-29/OXA细胞的耐药性逆转作用,流式细胞术检测细胞凋亡、周期变化;实时定量PCR检测各组细胞肺耐药蛋白(lung resistance protein LRP)和P-glycoprotein(P-gp)m RNA表达水平;Western blot检测各组细胞LRP和P-gp蛋白的表达水平。结果苦参碱使HT-29/OXA细胞对奥沙利铂的敏感性增加,耐药性得到部分逆转。奥沙利铂(0.5μg/m L)和苦参碱(3.0μg/m L)单独用药对结肠癌耐药细胞株HT-29/OXA细胞周期以及细胞凋亡没有影响;联合用药对HT-29/OXA生长增殖具有明显抑制作用并且能够通过改变细胞周期引起凋亡(P<0.05)。奥沙利铂(0.5μg/m L)和苦参碱(3.0μg/m L)单独用药对HT-29/OXALRP和P-gp m RNA以及蛋白的表达没有影响;联合用药作用后LRP m RNA和P-gp m RNA表达水平降低(P<0.01),同时下调了LRP和P-gp蛋白表达(P<0.01)。结论苦参碱部分逆转HT-29/OXA细胞对奥沙利铂的耐药性,其机制可能与细胞内LRP和P-gp表达降低有关。展开更多
基金Supported by the National Natural Science Foundation of China(No.81073097)the Developmental Fund of CHEN Ke-ji Integrative Medicine(No.CKJ 2011001)the Natural Science Foundation of Fujian Province of China(No.2010J01195)
文摘Objective：To investigate the cellular effects of Pien Tze Huang（片仔癀,PZH） in the HT-29 human colon carcinoma cell line.Methods：The viability of HT-29 cells was determined by MTT assay.A fluorescence-activated cell sorting（FACS） analysis with annexin-V/propidium iodide（PI） and JC-1 staining were performed to determine cell apoptosis and the loss of mitochondrial membrane potential,respectively.Activation of caspase 3 was evaluated by a colorimetric assay.The mRNA expression levels of Bcl-2 and Bax were measured by reverse transcription polymerase chain reaction（RT-PCR）.Results：PZH,in a dose- and time-dependent manner,reduced viability and induced apoptosis of HT-29 cells.Moreover,PZH treatment resulted in the collapse of the mitochondrial membrane potential,activation of caspase 3,and an increase in the Bax/Bcl-2 ratio.Conclusion：PZH inhibits the growth of HT-29 cells by inducing cancer cell apoptosis via regulation of the Bcl-2 family and activation of caspase 3,which may,in part,explain its anticancer activity.
文摘INTRODUCTIONSialyl Lewis-X antigen ,correlated with carcinoma, is a group of carbohydrate antigen containing oligosaccharide expressed of embryonic tisue and glycoproteins on cell surface of embryonic tissue[1].The SLeX antigen located on cell surface is synthesized principally by two enzymes ,al ,3fucosyltransfrease and a2, 3sialyctransferase.In adults ,SLeX antigen is expressed principally on the surfaces of granulocytic cells and some tumor cells .
文摘AIM： To investigate the effect of paeonol on controlling the proliferation of colorectal cancer cell line HT-29 and to discuss its possible mechanism. METHODS： The inhibitory effect of paeonol on proliferation of HT-29 cells was detected by M-I-I- assay. The results of apoptosis were measured by flow cytometry. Immunocytochemical staining was performed to detect the expression of cyclooxygenase-2 （COX-2） and protein p27 in HT-29 cells treated with paeonol at different concentrations. Reverse transcription-polymerase chain reaction （RT- PCR） was used for mRNA analysis. RESULTS： From the data of both MTT and flow cytometry, we observed that cell proliferation was inhibited by different concentrations of paeonol. By immunocytochemical staining, we found that HT-29 cells treated with paeonol （0.024-1.504 mmol/L） reflected reduced expression of COX-2 and increased expression of p27 in a dose-dependent manner. RT-PCR showed that paeonol down-regulated COX-2 and up-regulated p27 in a dose- and time-dependent manner in HT-29 cells. CONCLUSION： One of the apoptotic mechanisms of paeonol is down-regulation of COX-2. p27 is upregulated simultaneously and plays an important part in controlling cell proliferation and is a crucial factor in the Fas/FasL apoptosis pathway.
文摘LIGHT [homologous to lymphotoxins, shows inducible expression, and competes with herpes simplex virus glycoprotein D for herpes virus entry mediator (HVEM/TR2)] is a new member of TNF superfamily. The HT-29 colon cancer cell line is the most sensitive to LIGHT-induced, IFNγ-mediated apoptosis among the cell lines we have examined so far. Besides downregulation of Bcl-XL, upregulation of Bak, and activation of both PARP [poly (ADP-ribose)polymerase] and DFF45 (DNA fragmentation factor), LIGHT-induced, IFNγ-mediated apoptosis of HT-29 cells involves extensive caspase activation. Caspase-8 and caspase-9 activation, as shown by their cleavages appeared as early as 24 h after treatment, whereas caspase-3 and caspase-7 activation, as shown by their cleavages occurred after 72 h of LIGHT treatment. Caspase-3 inhibitor Z-DEVD-FMK (benzyloxycarbonyl-Asp-Glu-Val-Asp-fluoromethylketone)and a broad range caspase inhibitor Z-VAD-FMK (benzyloxycarbonyl-Val-Ala-Asp fluoromethylketone) were able to block LIGHT-induced, IFNγ-mediated apoptosis of HT-29 cells. The activity of caspase-3, which is one of the major executioner caspases, was found to be inhibited by both Z-DEVD-MFK and Z-VAD-FMK. These results suggest that LIGHT-induced, IFNγ-mediated apoptosis of HT-29 cells is caspase-dependent, and LIGHT signaling is mediated through both death receptor and mitochondria pathways.
基金Project (No.2006C12098) supported by the Science and TechnologyDepartment of Zhejiang Province, China
文摘Objective： To investigate the effects of curcumin on release of cytochrome c and expressions of Bcl-2, Bax, Bad, Bcl-xL, caspase-3, poly ADP-ribose polymerase （PARP）, and survivin of HT-29 cells. Methods： HT-29 cells were treated with curcumin （0-80 μmol/L） for 24 h. The release of cytochrome c from the mitochondria and the apoptosis-related proteins Bax, Bcl-2, Bcl-xL, Bad, caspase-3, PARP, and survivin were determined by Western blot analysis and their mRNA expressions by reverse transcriptase-polymerase chain reaction （RT-PCR）. Results： Curcumin significantly induced the growth inhibition and apoptosis of HT-29 cells. A decrease in expressions of Bcl-2, Bcl-xL and survivin was observed after exposure to 10-80 μmol/L curcumin, while the levels of Bax and Bad increased in the curcumin-treated cells. Curcumin also induced the release of cyto- chrome c, the activation ofcaspase-3, and the cleavage of PARP in a dose-dependent manner. Conclusion： These data suggest that curcumin induced the HT-29 cell apoptosis possibly via the mitoehondria-mediated pathway.
文摘目的研究苦参碱对结肠癌耐药细胞HT-29/奥沙利铂(Oxaliplatin,OXA)耐药性的逆转作用并探讨其可能的作用机制。方法采用逐步增加药物浓度的方法建立奥沙利铂耐药结肠癌细胞株HT-29/OXA;CCK-8法测定苦参碱对HT-29/OXA细胞的耐药性逆转作用,流式细胞术检测细胞凋亡、周期变化;实时定量PCR检测各组细胞肺耐药蛋白(lung resistance protein LRP)和P-glycoprotein(P-gp)m RNA表达水平;Western blot检测各组细胞LRP和P-gp蛋白的表达水平。结果苦参碱使HT-29/OXA细胞对奥沙利铂的敏感性增加,耐药性得到部分逆转。奥沙利铂(0.5μg/m L)和苦参碱(3.0μg/m L)单独用药对结肠癌耐药细胞株HT-29/OXA细胞周期以及细胞凋亡没有影响;联合用药对HT-29/OXA生长增殖具有明显抑制作用并且能够通过改变细胞周期引起凋亡(P<0.05)。奥沙利铂(0.5μg/m L)和苦参碱(3.0μg/m L)单独用药对HT-29/OXALRP和P-gp m RNA以及蛋白的表达没有影响;联合用药作用后LRP m RNA和P-gp m RNA表达水平降低(P<0.01),同时下调了LRP和P-gp蛋白表达(P<0.01)。结论苦参碱部分逆转HT-29/OXA细胞对奥沙利铂的耐药性,其机制可能与细胞内LRP和P-gp表达降低有关。
