Integrins mediate cell adhesion to the extracellular matrix (ECM). In particular, integrin alphavbeta3 recognizes the RGD motif as a ligand-binding site on various extracellular molecules of the extracellular matrix. ...Integrins mediate cell adhesion to the extracellular matrix (ECM). In particular, integrin alphavbeta3 recognizes the RGD motif as a ligand-binding site on various extracellular molecules of the extracellular matrix. Integrin aphavbeta3 has been associated with high malignant potential in breast cancer cells, and has signalized the onset of widespread metastasis. In recent years, several antagonists of integrin alphavbeta3, including snake venom disintegrins, have been used as potential anti-cancer agents. In the present work, the effect of contortrostatin, a disintegrin isolated from the venom of the snake Agkistrodon contortrix, was studied on primary cultures of human breast cancer cell. Scanning and transmission electron microscopy were employed in order to examine alterations in cell morphology and fluorescent microscopy and visualize changes in distribution of integrin alphavbeta3 and talin. Fluorescent localization of caspase 8 was made in order to visualize any sign of proapoptotosis and western immunoblotting of integrin, talin and annexin was undertaken in order to identify changes. The results suggest that the snake venom contortrostatin seriously affects cell morphology, adhesion and mobility and induces breast cancer cells to apoptosis.展开更多
背景:胎盘间充质干细胞来源丰富,易于获取,可向成骨细胞、神经细胞及肝细胞等方向分化,临床应用不存在免疫排斥、不涉及伦理问题等优点,因此被认为是成体干细胞的理想来源。目的:观察同种异体胎盘间充质干细胞移植修复大鼠子宫内膜损伤...背景:胎盘间充质干细胞来源丰富,易于获取,可向成骨细胞、神经细胞及肝细胞等方向分化,临床应用不存在免疫排斥、不涉及伦理问题等优点,因此被认为是成体干细胞的理想来源。目的:观察同种异体胎盘间充质干细胞移植修复大鼠子宫内膜损伤的情况。方法:取雌性SD大鼠,通过热损伤法建立子宫内膜损伤模型,造模后第15天,将造模成功的40只大鼠随机分为4组,宫腔移植组于宫腔局部注射同种异体胎盘间充质干细胞悬液1 m L,宫腔对照组于宫腔注射等量的PBS,尾静脉移植组于尾静脉注射同种异体胎盘间充质干细胞悬液1 m L,尾静脉对照组于尾静脉注射等量PBS。于大鼠第3个动情期时将造模雌鼠与雄鼠合笼,观察阴栓,在观察到阴栓的当天处死造模大鼠,游离出子宫组织,进行子宫内腺体计数、免疫组织化学及Western blot检测。结果与结论:(1)腺体计数:宫腔移植组子宫内膜腺体数量多于其余3组(P<0.05),尾静脉移植组多于宫腔对照组、尾静脉对照组(P<0.05);(2)子宫内膜整合素αVβ3表达:免疫组织化学及Western blot检测均显示宫腔移植组整合素αVβ3强于其余3组(P<0.05),尾静脉移植组多于宫腔对照组、尾静脉对照组(P<0.05);(3)结果表明:胎盘间充质干细胞移植可不同程度地修复大鼠子宫内膜损伤组织,增加子宫内膜腺体计数,改善子宫内膜容受性。展开更多
文摘Integrins mediate cell adhesion to the extracellular matrix (ECM). In particular, integrin alphavbeta3 recognizes the RGD motif as a ligand-binding site on various extracellular molecules of the extracellular matrix. Integrin aphavbeta3 has been associated with high malignant potential in breast cancer cells, and has signalized the onset of widespread metastasis. In recent years, several antagonists of integrin alphavbeta3, including snake venom disintegrins, have been used as potential anti-cancer agents. In the present work, the effect of contortrostatin, a disintegrin isolated from the venom of the snake Agkistrodon contortrix, was studied on primary cultures of human breast cancer cell. Scanning and transmission electron microscopy were employed in order to examine alterations in cell morphology and fluorescent microscopy and visualize changes in distribution of integrin alphavbeta3 and talin. Fluorescent localization of caspase 8 was made in order to visualize any sign of proapoptotosis and western immunoblotting of integrin, talin and annexin was undertaken in order to identify changes. The results suggest that the snake venom contortrostatin seriously affects cell morphology, adhesion and mobility and induces breast cancer cells to apoptosis.
文摘背景:胎盘间充质干细胞来源丰富,易于获取,可向成骨细胞、神经细胞及肝细胞等方向分化,临床应用不存在免疫排斥、不涉及伦理问题等优点,因此被认为是成体干细胞的理想来源。目的:观察同种异体胎盘间充质干细胞移植修复大鼠子宫内膜损伤的情况。方法:取雌性SD大鼠,通过热损伤法建立子宫内膜损伤模型,造模后第15天,将造模成功的40只大鼠随机分为4组,宫腔移植组于宫腔局部注射同种异体胎盘间充质干细胞悬液1 m L,宫腔对照组于宫腔注射等量的PBS,尾静脉移植组于尾静脉注射同种异体胎盘间充质干细胞悬液1 m L,尾静脉对照组于尾静脉注射等量PBS。于大鼠第3个动情期时将造模雌鼠与雄鼠合笼,观察阴栓,在观察到阴栓的当天处死造模大鼠,游离出子宫组织,进行子宫内腺体计数、免疫组织化学及Western blot检测。结果与结论:(1)腺体计数:宫腔移植组子宫内膜腺体数量多于其余3组(P<0.05),尾静脉移植组多于宫腔对照组、尾静脉对照组(P<0.05);(2)子宫内膜整合素αVβ3表达:免疫组织化学及Western blot检测均显示宫腔移植组整合素αVβ3强于其余3组(P<0.05),尾静脉移植组多于宫腔对照组、尾静脉对照组(P<0.05);(3)结果表明:胎盘间充质干细胞移植可不同程度地修复大鼠子宫内膜损伤组织,增加子宫内膜腺体计数,改善子宫内膜容受性。
