Integrin β4 (ITGB4) is emerging as a pivotal player in breast cancer progression, particularly in aggressive and invasive subtypes such as triple-negative breast cancer (TNBC). This review broadly summarizes current ...Integrin β4 (ITGB4) is emerging as a pivotal player in breast cancer progression, particularly in aggressive and invasive subtypes such as triple-negative breast cancer (TNBC). This review broadly summarizes current research on ITGB4’s involvement in breast cancer, focusing on its role in metastasis, metabolic reprogramming, drug resistance, and immunoregulation that collectively influence tumor behavior with implications for the development of innovative and more efficacious therapeutic modalities.展开更多
目的:研究细胞培养密度对MCF7乳腺癌细胞integrinβ4水解机制。方法:常规培养高密度和低密度MCF7乳腺癌细胞,分别给予钙离子螯合剂和肝素处理,用Western blot检测不同培养密度MCF7细胞integrinβ4的水解情况;用Fluo-3 AM作为钙离子荧光...目的:研究细胞培养密度对MCF7乳腺癌细胞integrinβ4水解机制。方法:常规培养高密度和低密度MCF7乳腺癌细胞,分别给予钙离子螯合剂和肝素处理,用Western blot检测不同培养密度MCF7细胞integrinβ4的水解情况;用Fluo-3 AM作为钙离子荧光探针,激光共聚焦扫描显微镜检测细胞内钙离子的分布。结果:Western blot检测结果显示,在低密度和高密度培养的MCF7细胞中,integrinβ4的水解模式不同;在高浓度培养的细胞中,200 k D integrinβ4片段产生增多;激光共聚焦扫描显微镜观察发现,低密度培养MCF7细胞中,钙离子的绿色荧光主要成团或颗粒状分布,而且与红色荧光有较多的重合,部分钙离子分布于细胞核内;在高密度培养的细胞中,钙离子在细胞质膜和细胞核中的定位较少;钙离子螯合剂BAPTA-AM处理可使200 k D integrinβ4明显减少;10-6mol/L的肝素能够减少MCF7细胞200 k D水解片段的增多,随着肝素浓度的增高,抑制效果有所增强;相对于BAPTA-AM,10-4mol/L肝素的抑制效应减弱。结论:高密度培养的MCF7细胞中,钙离子从钙库中释放,细胞外内流增多,激活calpain 2,导致200 k D integrinβ4水解片段增多。展开更多
文摘Integrin β4 (ITGB4) is emerging as a pivotal player in breast cancer progression, particularly in aggressive and invasive subtypes such as triple-negative breast cancer (TNBC). This review broadly summarizes current research on ITGB4’s involvement in breast cancer, focusing on its role in metastasis, metabolic reprogramming, drug resistance, and immunoregulation that collectively influence tumor behavior with implications for the development of innovative and more efficacious therapeutic modalities.
文摘目的:研究细胞培养密度对MCF7乳腺癌细胞integrinβ4水解机制。方法:常规培养高密度和低密度MCF7乳腺癌细胞,分别给予钙离子螯合剂和肝素处理,用Western blot检测不同培养密度MCF7细胞integrinβ4的水解情况;用Fluo-3 AM作为钙离子荧光探针,激光共聚焦扫描显微镜检测细胞内钙离子的分布。结果:Western blot检测结果显示,在低密度和高密度培养的MCF7细胞中,integrinβ4的水解模式不同;在高浓度培养的细胞中,200 k D integrinβ4片段产生增多;激光共聚焦扫描显微镜观察发现,低密度培养MCF7细胞中,钙离子的绿色荧光主要成团或颗粒状分布,而且与红色荧光有较多的重合,部分钙离子分布于细胞核内;在高密度培养的细胞中,钙离子在细胞质膜和细胞核中的定位较少;钙离子螯合剂BAPTA-AM处理可使200 k D integrinβ4明显减少;10-6mol/L的肝素能够减少MCF7细胞200 k D水解片段的增多,随着肝素浓度的增高,抑制效果有所增强;相对于BAPTA-AM,10-4mol/L肝素的抑制效应减弱。结论:高密度培养的MCF7细胞中,钙离子从钙库中释放,细胞外内流增多,激活calpain 2,导致200 k D integrinβ4水解片段增多。
