目的:探讨S100A4在低氧条件下对胃癌细胞SGC-7901迁移及侵袭的作用及其可能的机制。方法:将化学合成的si-S100A4质粒和阴性对照(si-Ctrl)质粒分别转染胃癌细胞株SGC-7901,根据培养条件的不同分为常氧条件(normal,Nor)+si-S100A4组、Nor+...目的:探讨S100A4在低氧条件下对胃癌细胞SGC-7901迁移及侵袭的作用及其可能的机制。方法:将化学合成的si-S100A4质粒和阴性对照(si-Ctrl)质粒分别转染胃癌细胞株SGC-7901,根据培养条件的不同分为常氧条件(normal,Nor)+si-S100A4组、Nor+si-Ctrl组、低氧条件(hypoxia,Hyp)+si-Ctrl)组、Hyp+si-S100A4组。应用Western blotting检测低氧条件下胃癌SGC-7901细胞中HIF-1及S100A4蛋白的表达变化,检测低氧条件下胃癌细胞中抑制S100A4的表达对细胞中S100A4、β-catenin及TCF-4表达的影响,Transwell小室法分别检测低氧及S100A4对胃癌SGC-7901细胞迁移及侵袭能力的影响。结果:低氧条件下:(1)胃癌SGC-7901细胞中HIF-1和S100A4表达水平均明显升高(3.12±0.23 vs 1.02±0.05,P<0.01;2.75±0.32 vs 1.05±0.07,P<0.01),且两者变化明显相关(r=0.67,P<0.01);(2)胃癌SGC-7901细胞的侵袭及迁移能力增加[(223.31±35.12)vs(131.29±26.40)、(142.27±26.37)个,P<0.05]。干扰低氧条件中S100A4的表达:(1)明显减少低氧对细胞中β-catenin及TCF-4的促进作用(均P<0.01);(2)明显减少低氧对SGC-7901细胞的侵袭及迁移能力的促进作用[(161.37±31.02)vs(88.21±22.42)、(95.36±21.29)个,P<0.05]。结论:S100A4能够促进胃癌细胞SGC-7901的迁移和侵袭,该作用可能是通过S100A4协同HIF-1通过Wnt/β-catenin通路的调控实现的。展开更多
Objective Pancreatic cancer is one of the most deadly cancers, which is characterized by its high metastatic potential. S100A4 is a major prometastatic protein involved in tumor invasion and metastasis which precise r...Objective Pancreatic cancer is one of the most deadly cancers, which is characterized by its high metastatic potential. S100A4 is a major prometastatic protein involved in tumor invasion and metastasis which precise role in pancreatic cancer has not been fully investigated. We knocked down the S100A4 gene in the Bxpc-3 pancreatic cancer cell line via RNA interference to study the changes in cell behavior. Methods Real-time polymerase chain reaction and western blotting were used to detect mRNA and protein expression levels of S100A4, matrix metalloproteinase （MMP）-2, E-cadherin and thrombospondin （TSP）-I. Transwell chambers were used to detect the migration and invasion abilities; a cell adhesion assay was used to detect adhesion ability; colony forming efficiency was used to detect cell proliferation; flow cytometry was used to detect apoptosis. Results S100A4 mRNA expression was reduced to 17% after transfection with SIOOA4-siRNA, and protein expression had a similar trend, mRNA and protein expression of MMP-2 was reduced and that of E-cadherin and TSP-1 was elevated, indicating that S100A4 affects their expression. S100A4-silenced cells exhibited a marked decrease in migration and invasiveness and increased adhesion, whereas overall proliferation and apoptosis were not overtly altered. Conclusion S100A4 and its downstream factors play important roles in pancreatic cancer invasion, and silencing AIOOA4 can significantly contain the invasiveness of pancreatic cancer.展开更多
Objective： To detect the expression of KISS-1 and S100A4 in the primary tumor tissues and lymphatic and visceral metastases and investigate its role in tumorigenesis and metastasis of gastric cancer. Methods： The pr...Objective： To detect the expression of KISS-1 and S100A4 in the primary tumor tissues and lymphatic and visceral metastases and investigate its role in tumorigenesis and metastasis of gastric cancer. Methods： The protein expression of KISS-1 and S100A4 in lymphatic and visceral metastases from advanced gastric cancer specimens was mainly examined by immunohistochemical staining and tissues microarray. Results： Immunohistochemical staining revealed reduced expression of KISS-1 and up-regulated expression of S100A4 in lymph node and visceral metastases. Rates of KISS-1 expression in normal tissues, primary tumor tissues, lymph node and visceral metastases were 95.8%, 74.6%, 60.9% and 57.5%. $100A4 expression in associated cases was 43.6%, 71.8%, 70.3% and 90.0%, respectively. Significant differences in KISS-1 expression was significantly higher in normal tissues than that in primary tumor tissues （P〈0.001）. While significant differences of S100A4 expression could be seen between normal and cancer tissues （P〈0.001） and between visceral and primary tumors （P〈0.05）. Conclusion： Tumor metastasis results from gradual accumulation of abnormal genetic alterations. Down-regulation of KISS-1 and up-regulation of S100A4 play a critical role in metastasis of gastric carcinoma.展开更多
文摘目的:探讨S100A4在低氧条件下对胃癌细胞SGC-7901迁移及侵袭的作用及其可能的机制。方法:将化学合成的si-S100A4质粒和阴性对照(si-Ctrl)质粒分别转染胃癌细胞株SGC-7901,根据培养条件的不同分为常氧条件(normal,Nor)+si-S100A4组、Nor+si-Ctrl组、低氧条件(hypoxia,Hyp)+si-Ctrl)组、Hyp+si-S100A4组。应用Western blotting检测低氧条件下胃癌SGC-7901细胞中HIF-1及S100A4蛋白的表达变化,检测低氧条件下胃癌细胞中抑制S100A4的表达对细胞中S100A4、β-catenin及TCF-4表达的影响,Transwell小室法分别检测低氧及S100A4对胃癌SGC-7901细胞迁移及侵袭能力的影响。结果:低氧条件下:(1)胃癌SGC-7901细胞中HIF-1和S100A4表达水平均明显升高(3.12±0.23 vs 1.02±0.05,P<0.01;2.75±0.32 vs 1.05±0.07,P<0.01),且两者变化明显相关(r=0.67,P<0.01);(2)胃癌SGC-7901细胞的侵袭及迁移能力增加[(223.31±35.12)vs(131.29±26.40)、(142.27±26.37)个,P<0.05]。干扰低氧条件中S100A4的表达:(1)明显减少低氧对细胞中β-catenin及TCF-4的促进作用(均P<0.01);(2)明显减少低氧对SGC-7901细胞的侵袭及迁移能力的促进作用[(161.37±31.02)vs(88.21±22.42)、(95.36±21.29)个,P<0.05]。结论:S100A4能够促进胃癌细胞SGC-7901的迁移和侵袭,该作用可能是通过S100A4协同HIF-1通过Wnt/β-catenin通路的调控实现的。
文摘Objective Pancreatic cancer is one of the most deadly cancers, which is characterized by its high metastatic potential. S100A4 is a major prometastatic protein involved in tumor invasion and metastasis which precise role in pancreatic cancer has not been fully investigated. We knocked down the S100A4 gene in the Bxpc-3 pancreatic cancer cell line via RNA interference to study the changes in cell behavior. Methods Real-time polymerase chain reaction and western blotting were used to detect mRNA and protein expression levels of S100A4, matrix metalloproteinase （MMP）-2, E-cadherin and thrombospondin （TSP）-I. Transwell chambers were used to detect the migration and invasion abilities; a cell adhesion assay was used to detect adhesion ability; colony forming efficiency was used to detect cell proliferation; flow cytometry was used to detect apoptosis. Results S100A4 mRNA expression was reduced to 17% after transfection with SIOOA4-siRNA, and protein expression had a similar trend, mRNA and protein expression of MMP-2 was reduced and that of E-cadherin and TSP-1 was elevated, indicating that S100A4 affects their expression. S100A4-silenced cells exhibited a marked decrease in migration and invasiveness and increased adhesion, whereas overall proliferation and apoptosis were not overtly altered. Conclusion S100A4 and its downstream factors play important roles in pancreatic cancer invasion, and silencing AIOOA4 can significantly contain the invasiveness of pancreatic cancer.
文摘Objective： To detect the expression of KISS-1 and S100A4 in the primary tumor tissues and lymphatic and visceral metastases and investigate its role in tumorigenesis and metastasis of gastric cancer. Methods： The protein expression of KISS-1 and S100A4 in lymphatic and visceral metastases from advanced gastric cancer specimens was mainly examined by immunohistochemical staining and tissues microarray. Results： Immunohistochemical staining revealed reduced expression of KISS-1 and up-regulated expression of S100A4 in lymph node and visceral metastases. Rates of KISS-1 expression in normal tissues, primary tumor tissues, lymph node and visceral metastases were 95.8%, 74.6%, 60.9% and 57.5%. $100A4 expression in associated cases was 43.6%, 71.8%, 70.3% and 90.0%, respectively. Significant differences in KISS-1 expression was significantly higher in normal tissues than that in primary tumor tissues （P〈0.001）. While significant differences of S100A4 expression could be seen between normal and cancer tissues （P〈0.001） and between visceral and primary tumors （P〈0.05）. Conclusion： Tumor metastasis results from gradual accumulation of abnormal genetic alterations. Down-regulation of KISS-1 and up-regulation of S100A4 play a critical role in metastasis of gastric carcinoma.
