AIM To investigate the role of calmodulin-dependent protein kinase Ⅱ(Ca MKⅡ) in colon cancer growth,migration and invasion.METHODS Ca MKⅡ expression in colon cancer and paracancerous tissues was evaluated via immun...AIM To investigate the role of calmodulin-dependent protein kinase Ⅱ(Ca MKⅡ) in colon cancer growth,migration and invasion.METHODS Ca MKⅡ expression in colon cancer and paracancerous tissues was evaluated via immunochemistry. Transcriptional and posttranscriptional levels of Ca MKⅡin tissue samples and MMP2,MMP9 and TIMP-1 expression in the human colon cancer cell line HCT116 were assessed by q RTPCR and western blot. Cell proliferation was detected with the MTT assay. Cancer cell migration and invasion were investigated with the Transwell culture system and woundhealing assay.RESULTS We first demonstrated that CaMK Ⅱ was ove rexpressed in human colon cancers and was associated with cancer differentiation. In the human colon cancer cell line HCT116,the Ca MKII-specific inhibitor KN93,but not its inactive analogue KN92,decreased cancer cell proliferation. Furthermore,KN93 also significantly prohibited HCT116 cell migration and invasion. The specific inhibition of ERK1/2 or p38 decreased the proliferation and migration of colon cancer cells.CONCLUSION Our findings highlight Ca MKⅡ as a potential critical mediator in human colon tumor development and metastasis.展开更多
Many of the effects of Ca^2＋ signaling are mediated through the Ca^2＋/calmodulin complex and its acceptors, the Ca^2＋/calmodulin-dependent protein kinases, including PSKHI. Studies of the proteins involved in the c...Many of the effects of Ca^2＋ signaling are mediated through the Ca^2＋/calmodulin complex and its acceptors, the Ca^2＋/calmodulin-dependent protein kinases, including PSKHI. Studies of the proteins involved in the calcium metabolism in oysters will help elucidate the pearl formation mechanism. This paper describes a full-length PSKH1 cDNA isolated from pearl oyster Pinctada fucata. Oyster PSKH1 shares 65% homology with human PSKH1 and 48% similarity with rat CaM kinase I in the amino acid sequence, and contains a calmodulin-binding domain. The results of semi-quantitative reverse transcription-polymerase chain reaction and in situ hybridization revealed that oyster PSKH1 mRNA is highly expressed in the outer epithelial cells of the mantle pallial and in the gill epithelial cells. These studies provide important information describing the complex Ca^2＋ signaling mechanism in oyster calcium metabolism.展开更多
蛋白质的磷酸化与去磷酸化是细胞信号转导过程中最重要的调控方式,其循环过程就像调控分子的开关一样,参与众多生理活动。负责这一修饰调节的是蛋白激酶与蛋白磷酸酶。报道显示人类染色体编码多达500个蛋白激酶,这些蛋白激酶满足人类高...蛋白质的磷酸化与去磷酸化是细胞信号转导过程中最重要的调控方式,其循环过程就像调控分子的开关一样,参与众多生理活动。负责这一修饰调节的是蛋白激酶与蛋白磷酸酶。报道显示人类染色体编码多达500个蛋白激酶,这些蛋白激酶满足人类高度多样性与差异性调控蛋白磷酸化作用,而有趣的是人类编码的蛋白磷酸酶却仅仅约为150个,其中约有40个是丝氨酸/苏氨酸蛋白磷酸酶。越来越多的证据表明蛋白磷酸酶/蛋白激酶调控异常在心肌病中起关键作用。蛋白磷酸酶1(protein phosphatase 1,PP1)是一多功能的丝氨酸/苏氨酸蛋白磷酸酶,研究显示PP1在心肌肥厚和心衰的发生发展过程中起重要作用。而Ca2+/钙调素依赖性蛋白激酶Ⅱ(Ca2+/calmodulin-dependent protein kinaseⅡ,CaMKⅡ)是一种多功能的丝氨酸/苏氨酸蛋白激酶,它作为Ca2+信号转导的关键因子,调节细胞的多种生物学功能,其功能异常可引起肥厚心肌胞内钙稳态失衡进而引起心律失常等心肌病。该文就PP1与CaMKⅡ的功能和心肌病的关系作一综述。展开更多
目的探讨大鼠骨髓间充质干细胞(rat bone m arrow m esenchym al stem cells,MSCs)体外诱导分化为心肌样细胞内游离钙浓度([Ca2+]i)及钙调蛋白依赖性蛋白激酶Ⅱ(CaMKⅡ)的表达变化。方法取健康SD大鼠骨髓,用5-氮杂胞苷体外诱导培养。取...目的探讨大鼠骨髓间充质干细胞(rat bone m arrow m esenchym al stem cells,MSCs)体外诱导分化为心肌样细胞内游离钙浓度([Ca2+]i)及钙调蛋白依赖性蛋白激酶Ⅱ(CaMKⅡ)的表达变化。方法取健康SD大鼠骨髓,用5-氮杂胞苷体外诱导培养。取诱导培养2、3、4周的MSCs为Ⅰ、Ⅱ、Ⅲ组,另取急性分离的心肌细胞为对照组,分别用激光共聚焦技术和W estern b lot技术检测[Ca2+]i及CaMKⅡ表达水平。结果经荧光探针结合Ca2+后,用激光共聚焦技术检测发现,随诱导培养时间的延长,[Ca2+]i逐渐增加;诱导培养4周的MSCs内[Ca2+]i与对照组比较无显著差异[(100.81±17.64),(100.32±17.10),P>0.05]。各组细胞CaMKⅡ的变化趋势与[Ca2+]i定量分析结果相似,Ⅰ、Ⅱ、Ⅲ组及对照组分别为(322.45±19.43)、(434.43±16.77)、(680.91±20.61)、(682.69±21.03),Ⅲ组与对照组比较P>0.05。结论大鼠MSCs在体外诱导培养4周后已分化为心肌样细胞,其细胞内游离钙浓度和CaMKⅡ蛋白表达水平与正常心肌细胞相似。展开更多
为了探讨 DA耗竭对纹状体神经元缺血性损伤的保护作用是否与 Ca M K 的参与有关 ,建立了损毁大鼠黑质 +四动脉阻断前脑缺血的复合模型 ,采用同位素 3 2 P掺入法、放射自显影和 Ca M K 及磷酸化Ca M K (p- Ca M K )免疫组织化学方法 ,研...为了探讨 DA耗竭对纹状体神经元缺血性损伤的保护作用是否与 Ca M K 的参与有关 ,建立了损毁大鼠黑质 +四动脉阻断前脑缺血的复合模型 ,采用同位素 3 2 P掺入法、放射自显影和 Ca M K 及磷酸化Ca M K (p- Ca M K )免疫组织化学方法 ,研究了 DA耗竭对纹状体缺血 Ca M K 活性、自身磷酸化、含量和细胞内分布的影响。发现损毁黑质、耗竭 DA可逆转由缺血引起的纹状体 Ca M K 酶活性及免疫活性下降 ,减少该酶自身磷酸化状态。这些作用可能是损毁黑质保护纹状体缺血性损伤的机制之一。展开更多
基金Supported by the National Natural Science Foundation of China,No.81302131
文摘AIM To investigate the role of calmodulin-dependent protein kinase Ⅱ(Ca MKⅡ) in colon cancer growth,migration and invasion.METHODS Ca MKⅡ expression in colon cancer and paracancerous tissues was evaluated via immunochemistry. Transcriptional and posttranscriptional levels of Ca MKⅡin tissue samples and MMP2,MMP9 and TIMP-1 expression in the human colon cancer cell line HCT116 were assessed by q RTPCR and western blot. Cell proliferation was detected with the MTT assay. Cancer cell migration and invasion were investigated with the Transwell culture system and woundhealing assay.RESULTS We first demonstrated that CaMK Ⅱ was ove rexpressed in human colon cancers and was associated with cancer differentiation. In the human colon cancer cell line HCT116,the Ca MKII-specific inhibitor KN93,but not its inactive analogue KN92,decreased cancer cell proliferation. Furthermore,KN93 also significantly prohibited HCT116 cell migration and invasion. The specific inhibition of ERK1/2 or p38 decreased the proliferation and migration of colon cancer cells.CONCLUSION Our findings highlight Ca MKⅡ as a potential critical mediator in human colon tumor development and metastasis.
基金Supported by the National High-Tech Research and Development (863) Program of China (No. 2003AA603430) and the National Natural Science Foundation of China (No. 30371092)
文摘Many of the effects of Ca^2＋ signaling are mediated through the Ca^2＋/calmodulin complex and its acceptors, the Ca^2＋/calmodulin-dependent protein kinases, including PSKHI. Studies of the proteins involved in the calcium metabolism in oysters will help elucidate the pearl formation mechanism. This paper describes a full-length PSKH1 cDNA isolated from pearl oyster Pinctada fucata. Oyster PSKH1 shares 65% homology with human PSKH1 and 48% similarity with rat CaM kinase I in the amino acid sequence, and contains a calmodulin-binding domain. The results of semi-quantitative reverse transcription-polymerase chain reaction and in situ hybridization revealed that oyster PSKH1 mRNA is highly expressed in the outer epithelial cells of the mantle pallial and in the gill epithelial cells. These studies provide important information describing the complex Ca^2＋ signaling mechanism in oyster calcium metabolism.
文摘蛋白质的磷酸化与去磷酸化是细胞信号转导过程中最重要的调控方式,其循环过程就像调控分子的开关一样,参与众多生理活动。负责这一修饰调节的是蛋白激酶与蛋白磷酸酶。报道显示人类染色体编码多达500个蛋白激酶,这些蛋白激酶满足人类高度多样性与差异性调控蛋白磷酸化作用,而有趣的是人类编码的蛋白磷酸酶却仅仅约为150个,其中约有40个是丝氨酸/苏氨酸蛋白磷酸酶。越来越多的证据表明蛋白磷酸酶/蛋白激酶调控异常在心肌病中起关键作用。蛋白磷酸酶1(protein phosphatase 1,PP1)是一多功能的丝氨酸/苏氨酸蛋白磷酸酶,研究显示PP1在心肌肥厚和心衰的发生发展过程中起重要作用。而Ca2+/钙调素依赖性蛋白激酶Ⅱ(Ca2+/calmodulin-dependent protein kinaseⅡ,CaMKⅡ)是一种多功能的丝氨酸/苏氨酸蛋白激酶,它作为Ca2+信号转导的关键因子,调节细胞的多种生物学功能,其功能异常可引起肥厚心肌胞内钙稳态失衡进而引起心律失常等心肌病。该文就PP1与CaMKⅡ的功能和心肌病的关系作一综述。
文摘目的探讨大鼠骨髓间充质干细胞(rat bone m arrow m esenchym al stem cells,MSCs)体外诱导分化为心肌样细胞内游离钙浓度([Ca2+]i)及钙调蛋白依赖性蛋白激酶Ⅱ(CaMKⅡ)的表达变化。方法取健康SD大鼠骨髓,用5-氮杂胞苷体外诱导培养。取诱导培养2、3、4周的MSCs为Ⅰ、Ⅱ、Ⅲ组,另取急性分离的心肌细胞为对照组,分别用激光共聚焦技术和W estern b lot技术检测[Ca2+]i及CaMKⅡ表达水平。结果经荧光探针结合Ca2+后,用激光共聚焦技术检测发现,随诱导培养时间的延长,[Ca2+]i逐渐增加;诱导培养4周的MSCs内[Ca2+]i与对照组比较无显著差异[(100.81±17.64),(100.32±17.10),P>0.05]。各组细胞CaMKⅡ的变化趋势与[Ca2+]i定量分析结果相似,Ⅰ、Ⅱ、Ⅲ组及对照组分别为(322.45±19.43)、(434.43±16.77)、(680.91±20.61)、(682.69±21.03),Ⅲ组与对照组比较P>0.05。结论大鼠MSCs在体外诱导培养4周后已分化为心肌样细胞,其细胞内游离钙浓度和CaMKⅡ蛋白表达水平与正常心肌细胞相似。
文摘为了探讨 DA耗竭对纹状体神经元缺血性损伤的保护作用是否与 Ca M K 的参与有关 ,建立了损毁大鼠黑质 +四动脉阻断前脑缺血的复合模型 ,采用同位素 3 2 P掺入法、放射自显影和 Ca M K 及磷酸化Ca M K (p- Ca M K )免疫组织化学方法 ,研究了 DA耗竭对纹状体缺血 Ca M K 活性、自身磷酸化、含量和细胞内分布的影响。发现损毁黑质、耗竭 DA可逆转由缺血引起的纹状体 Ca M K 酶活性及免疫活性下降 ,减少该酶自身磷酸化状态。这些作用可能是损毁黑质保护纹状体缺血性损伤的机制之一。
