BACKGROUND Gastric cancer(GC)has become a serious threat to people's health.Accumulative evidence reveals that dysregulation of numerous microRNAs(miRNAs)has been found during malignant formation.So far,the role o...BACKGROUND Gastric cancer(GC)has become a serious threat to people's health.Accumulative evidence reveals that dysregulation of numerous microRNAs(miRNAs)has been found during malignant formation.So far,the role of microRNA-760(miR-760)in the development of GC is largely unknown.AIM To measure the expression level of miR-760 in GC and investigate its role in gastric tumorigenesis.METHODS Real-time quantitative polymerase chain reaction and Western blot analysis were used to measure the expression of miR-760 and G-protein-coupled receptor kinase interacting protein-1(GIT1).Cell growth was detected by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide(MTT)and cell colony formation assays.Apoptosis was assessed by flow cytometric analysis.The relationship between miR-760 and GIT1 was verified by luciferase reporter assay.RESULTS The results showed that the expression of miR-760 was decreased in GC and associated with poor clinical outcomes in GC patients.Furthermore,miR-760 restrained cell proliferation and cell colony formation and induced apoptosis in GC cells.In addition,miR-760 directly targeted GIT1 and negatively regulated its expression in GC.GIT1 was upregulated in GC and predicted a worse prognosis in GC patients.We also found that upregulation of GIT1 weakened the inhibitory CONCLUSION In conclusion,miR-760 targets GIT1 to inhibit cell growth and promote apoptosis in GC cells.Our data demonstrate that miR-760 may be a potential target for the treatment of GC.展开更多
BACKGROUND Cancer stem cells(CSCs)are a subpopulation of cancer cells with the potential of self-renewal and differentiation.CSCs play critical roles in tumorigenesis,recurrence,metastasis,radiation tolerance and chem...BACKGROUND Cancer stem cells(CSCs)are a subpopulation of cancer cells with the potential of self-renewal and differentiation.CSCs play critical roles in tumorigenesis,recurrence,metastasis,radiation tolerance and chemoresistance.AIM To assess the expression patterns and clinical potential of doublecortin-like kinase 1(DCLK1)and leucine-rich repeat-containing G-protein-coupled receptor 5(Lgr5),as prognostic CSC markers of colorectal cancer(CRC).METHODS The expression of DCLK1 and Lgr5 in CRC tissue sections from 92 patients was determined by immunohistochemistry.Each case was evaluated using a combined scoring method based on signal intensity staining(scored 0-3)and the proportion of positively stained cancer cells(scored 0-3).The final staining score was calculated as the intensity score multiplied by the proportion score.Low expression of DCLK1 and Lgr5 was defined as a score of 0-3;high expression of DCLK1 and Lgr5 was defined as a score of≥4.Specimens were categorized as either high or low expression,and the correlation between the expression of DCLK1 or Lgr5 and clinicopathological factors was investigated.RESULTS DCLK1 and Lgr5 expression levels were significantly positively correlated.CRC patients with high DCLK1,Lgr5 and DCLK1/Lgr5 expressions had poorer progression-free survival and overall survival.Moreover,high expression of DCLK1 was an independent prognostic factor for recurrence and overall survival in patients with CRC by multivariate analysis(P=0.026 and P=0.049,respectively).CONCLUSION DCLK1 may be a potential CSC marker for the recurrence and survival of CRC patients.展开更多
This study was aimed to explore the role of stromal-derived factor 1 (SDF-1)/CXC chemokine receptor 4 (CXCR4) axis in mediating the metastasis of ovarian cancer cells through activation of extracellular signal-reg...This study was aimed to explore the role of stromal-derived factor 1 (SDF-1)/CXC chemokine receptor 4 (CXCR4) axis in mediating the metastasis of ovarian cancer cells through activation of extracellular signal-regulated kinase-1/2 (ERK-1/2) signaling pathway. A highly metastatic ovarian cancer cell line, SKOV3, was used in the study. Intracellular calcium mobilization was detected by using laser scanning confocal fluorescence microscopy. Western blotting was used to detect the phosphorylation of ERK1/2 in SDF-1α-treated SKOV3 cells. Adhesion capability and matrix metalloproteinase (MMP) activity of ovarian cancer cells after exposure to SDF-1 a were measured by adhesion assay and gelatin zymography. The results showed that SDF-1α induced rapid intracellular calcium mobilization in SKOV3 cells, as well as the phosphorylation of ERK-1/2. The adhesion of ovarian cancer cells to fibronectin and collagen Ⅳ was increased after SDF-1α treatment. An inhibitor of ERK-1/2 signaling, PD98059, could antagonize such effects of SDF-1α. SDF-1α could also increase the secretion of active MMP-2 and MMP-9. It was concluded that the SDF-1/CXCR4 axis played a critical role in the metastasis of human ovarian cancer by increasing the adhesion capability of cancer cells and the activity of MMP-2 and MMP-9 via ERK1/2 signaling pathway.展开更多
目的研究ROCK/SLUG信号通路在内皮素-1(endo-thelin-1,ET-1)促进人卵巢癌细胞上皮向间充质转分化(epi-thelial to mesenchymal transition,EMT)中的作用。方法 ET-1处理人卵巢癌细胞株SK-OV-3和CaOV3,或共用ROCK的活化突变体转染细胞或...目的研究ROCK/SLUG信号通路在内皮素-1(endo-thelin-1,ET-1)促进人卵巢癌细胞上皮向间充质转分化(epi-thelial to mesenchymal transition,EMT)中的作用。方法 ET-1处理人卵巢癌细胞株SK-OV-3和CaOV3,或共用ROCK的活化突变体转染细胞或加入ROCK的抑制剂Y27632,并转染含SLUG启动子的pGL3质粒与Renilla质粒。实验末用Boyden小室体外侵袭实验检测细胞侵袭能力,细胞免疫荧光染色观察细胞形态,报告基因检测试剂盒检测SLUG启动子活性,用实时定量PCR和Western bot方法检测EMT相关基因的表达。结果 ET-1诱导SK-OV-3和CaOV3发生与EMT相一致的形态和基因变化,促进其细胞侵袭力;ET-1与内皮素A受体(endothelin A receptor,ETAR)结合,促进转录因子SLUG的转录;ET-1促进ROCK及fibronectin的表达,同时转染ROCK的活化突变体,促进ET-1诱导的fibronectin表达以及细胞侵袭力的增加。相反,ROCK抑制剂Y27632抑制ET-1对fibronectin表达以及细胞侵袭力的促进作用;转染ROCK的活化突变体,上调SLUG基因转录启动子活性促进其转录,抑制E-cadherin的转录。相反,ROCK的抑制剂Y27632抑制SLUG基因启动子的活性。结论 ET-1通过活化ROCK/SLUG通路促进人卵巢癌细胞发生EMT。展开更多
文摘BACKGROUND Gastric cancer(GC)has become a serious threat to people's health.Accumulative evidence reveals that dysregulation of numerous microRNAs(miRNAs)has been found during malignant formation.So far,the role of microRNA-760(miR-760)in the development of GC is largely unknown.AIM To measure the expression level of miR-760 in GC and investigate its role in gastric tumorigenesis.METHODS Real-time quantitative polymerase chain reaction and Western blot analysis were used to measure the expression of miR-760 and G-protein-coupled receptor kinase interacting protein-1(GIT1).Cell growth was detected by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide(MTT)and cell colony formation assays.Apoptosis was assessed by flow cytometric analysis.The relationship between miR-760 and GIT1 was verified by luciferase reporter assay.RESULTS The results showed that the expression of miR-760 was decreased in GC and associated with poor clinical outcomes in GC patients.Furthermore,miR-760 restrained cell proliferation and cell colony formation and induced apoptosis in GC cells.In addition,miR-760 directly targeted GIT1 and negatively regulated its expression in GC.GIT1 was upregulated in GC and predicted a worse prognosis in GC patients.We also found that upregulation of GIT1 weakened the inhibitory CONCLUSION In conclusion,miR-760 targets GIT1 to inhibit cell growth and promote apoptosis in GC cells.Our data demonstrate that miR-760 may be a potential target for the treatment of GC.
基金Supported by Sanming Project of Shenzhen,No.SZSM201612041Shenzhen Science and Technology Innovation Commission Project,No.GJHZ20180420180754917 and No.ZDSYS20190902092855097Postdoctoral Science Foundation of China,No.2018M633095.
文摘BACKGROUND Cancer stem cells(CSCs)are a subpopulation of cancer cells with the potential of self-renewal and differentiation.CSCs play critical roles in tumorigenesis,recurrence,metastasis,radiation tolerance and chemoresistance.AIM To assess the expression patterns and clinical potential of doublecortin-like kinase 1(DCLK1)and leucine-rich repeat-containing G-protein-coupled receptor 5(Lgr5),as prognostic CSC markers of colorectal cancer(CRC).METHODS The expression of DCLK1 and Lgr5 in CRC tissue sections from 92 patients was determined by immunohistochemistry.Each case was evaluated using a combined scoring method based on signal intensity staining(scored 0-3)and the proportion of positively stained cancer cells(scored 0-3).The final staining score was calculated as the intensity score multiplied by the proportion score.Low expression of DCLK1 and Lgr5 was defined as a score of 0-3;high expression of DCLK1 and Lgr5 was defined as a score of≥4.Specimens were categorized as either high or low expression,and the correlation between the expression of DCLK1 or Lgr5 and clinicopathological factors was investigated.RESULTS DCLK1 and Lgr5 expression levels were significantly positively correlated.CRC patients with high DCLK1,Lgr5 and DCLK1/Lgr5 expressions had poorer progression-free survival and overall survival.Moreover,high expression of DCLK1 was an independent prognostic factor for recurrence and overall survival in patients with CRC by multivariate analysis(P=0.026 and P=0.049,respectively).CONCLUSION DCLK1 may be a potential CSC marker for the recurrence and survival of CRC patients.
基金supported by a grant from Health Bureau of Hubei province (No. JX1A07)
文摘This study was aimed to explore the role of stromal-derived factor 1 (SDF-1)/CXC chemokine receptor 4 (CXCR4) axis in mediating the metastasis of ovarian cancer cells through activation of extracellular signal-regulated kinase-1/2 (ERK-1/2) signaling pathway. A highly metastatic ovarian cancer cell line, SKOV3, was used in the study. Intracellular calcium mobilization was detected by using laser scanning confocal fluorescence microscopy. Western blotting was used to detect the phosphorylation of ERK1/2 in SDF-1α-treated SKOV3 cells. Adhesion capability and matrix metalloproteinase (MMP) activity of ovarian cancer cells after exposure to SDF-1 a were measured by adhesion assay and gelatin zymography. The results showed that SDF-1α induced rapid intracellular calcium mobilization in SKOV3 cells, as well as the phosphorylation of ERK-1/2. The adhesion of ovarian cancer cells to fibronectin and collagen Ⅳ was increased after SDF-1α treatment. An inhibitor of ERK-1/2 signaling, PD98059, could antagonize such effects of SDF-1α. SDF-1α could also increase the secretion of active MMP-2 and MMP-9. It was concluded that the SDF-1/CXCR4 axis played a critical role in the metastasis of human ovarian cancer by increasing the adhesion capability of cancer cells and the activity of MMP-2 and MMP-9 via ERK1/2 signaling pathway.
文摘目的研究ROCK/SLUG信号通路在内皮素-1(endo-thelin-1,ET-1)促进人卵巢癌细胞上皮向间充质转分化(epi-thelial to mesenchymal transition,EMT)中的作用。方法 ET-1处理人卵巢癌细胞株SK-OV-3和CaOV3,或共用ROCK的活化突变体转染细胞或加入ROCK的抑制剂Y27632,并转染含SLUG启动子的pGL3质粒与Renilla质粒。实验末用Boyden小室体外侵袭实验检测细胞侵袭能力,细胞免疫荧光染色观察细胞形态,报告基因检测试剂盒检测SLUG启动子活性,用实时定量PCR和Western bot方法检测EMT相关基因的表达。结果 ET-1诱导SK-OV-3和CaOV3发生与EMT相一致的形态和基因变化,促进其细胞侵袭力;ET-1与内皮素A受体(endothelin A receptor,ETAR)结合,促进转录因子SLUG的转录;ET-1促进ROCK及fibronectin的表达,同时转染ROCK的活化突变体,促进ET-1诱导的fibronectin表达以及细胞侵袭力的增加。相反,ROCK抑制剂Y27632抑制ET-1对fibronectin表达以及细胞侵袭力的促进作用;转染ROCK的活化突变体,上调SLUG基因转录启动子活性促进其转录,抑制E-cadherin的转录。相反,ROCK的抑制剂Y27632抑制SLUG基因启动子的活性。结论 ET-1通过活化ROCK/SLUG通路促进人卵巢癌细胞发生EMT。