Src regulates cell adhesion, invasiveness, motility and growth in cancer cells. In melanoma, accumulating data show that Src inhibition can be effective and may enhance the effects of other agents. Increased Src expre...Src regulates cell adhesion, invasiveness, motility and growth in cancer cells. In melanoma, accumulating data show that Src inhibition can be effective and may enhance the effects of other agents. Increased Src expression and activity thus has recently become a target for drug therapy. Several melanoma cell lines were exposed to inhibitors of Src activity despite their broad specificity. To examine the particular activity of Src in human melanoma cells, we used SU6656, the selective inhibitor of Src family protein kinases. The activity of Src and cell proliferation were suppressed in HBL human cells, wild type melanoma cells and in SK-MEL-5 human melanoma cells harboring mutant BRAF V600E, upon their treatment with SU6656. The suppression of Src kinase activity had not inhibitory effects on Akt/PKB activity in SK-MEL-5 cells, which we have previously found in HBL cells. This may indicate that changes of Src involvement in the control of Akt/PKB activity and its downstream signaling could be induced by BRAF V600E mutation in SK-MEL-5 cells.展开更多
通过研究PKB/Akt与Girdin蛋白之间的关系,目的在于揭示Girdin蛋白在PKB/Akt调控小鼠受精卵微丝聚集中的作用。研究中首先结合软件(http://scansite.mit.edu//)预测了PKB/Akt对Girdin蛋白的磷酸化位点,并制定特定位点磷酸化抗体,通过蛋...通过研究PKB/Akt与Girdin蛋白之间的关系,目的在于揭示Girdin蛋白在PKB/Akt调控小鼠受精卵微丝聚集中的作用。研究中首先结合软件(http://scansite.mit.edu//)预测了PKB/Akt对Girdin蛋白的磷酸化位点,并制定特定位点磷酸化抗体,通过蛋白免疫印迹检测经PKB/Akt m RNA或PKB/Akt si RNA处理后的小鼠受精卵中Girdin蛋白磷酸化改变情况。同时检测了磷酸化的Girdin蛋白亚细胞定位及同微丝骨架的定位关系。进一步通过显微注射PKB/Akt m RNA再注射Girdin si RNA检测小鼠受精卵微丝骨架的聚集。结果显示经持续激活型PKB/Akt m RNA、野生型PKB/Akt m RNA处理后的小鼠受精卵中p-Girdin-1 417分布位置更加集中在2-细胞分裂沟处。经野生型和持续激活型PKB/Aktm RNA注射组p-Girdin-1 417表达增强,但是并不影响Girdin蛋白的总的表达。说明si RNA介导的PKB/Akt表达敲低非常明显地降低了Girdin蛋白的磷酸化。激光共聚焦研究显示在Akt m RNA和Girdin si RNA共注射组微丝骨架分布明显散乱。本研究结果充分说明Girdin蛋白在小鼠受精卵中受到PKB/Akt的调节,PKB/Akt通过磷酸化Girdin蛋白改变微丝骨架的聚集。展开更多
基金supported by grant NT11231-3/2010 from the Ministry of Health of the Czech Republic
文摘Src regulates cell adhesion, invasiveness, motility and growth in cancer cells. In melanoma, accumulating data show that Src inhibition can be effective and may enhance the effects of other agents. Increased Src expression and activity thus has recently become a target for drug therapy. Several melanoma cell lines were exposed to inhibitors of Src activity despite their broad specificity. To examine the particular activity of Src in human melanoma cells, we used SU6656, the selective inhibitor of Src family protein kinases. The activity of Src and cell proliferation were suppressed in HBL human cells, wild type melanoma cells and in SK-MEL-5 human melanoma cells harboring mutant BRAF V600E, upon their treatment with SU6656. The suppression of Src kinase activity had not inhibitory effects on Akt/PKB activity in SK-MEL-5 cells, which we have previously found in HBL cells. This may indicate that changes of Src involvement in the control of Akt/PKB activity and its downstream signaling could be induced by BRAF V600E mutation in SK-MEL-5 cells.
文摘通过研究PKB/Akt与Girdin蛋白之间的关系,目的在于揭示Girdin蛋白在PKB/Akt调控小鼠受精卵微丝聚集中的作用。研究中首先结合软件(http://scansite.mit.edu//)预测了PKB/Akt对Girdin蛋白的磷酸化位点,并制定特定位点磷酸化抗体,通过蛋白免疫印迹检测经PKB/Akt m RNA或PKB/Akt si RNA处理后的小鼠受精卵中Girdin蛋白磷酸化改变情况。同时检测了磷酸化的Girdin蛋白亚细胞定位及同微丝骨架的定位关系。进一步通过显微注射PKB/Akt m RNA再注射Girdin si RNA检测小鼠受精卵微丝骨架的聚集。结果显示经持续激活型PKB/Akt m RNA、野生型PKB/Akt m RNA处理后的小鼠受精卵中p-Girdin-1 417分布位置更加集中在2-细胞分裂沟处。经野生型和持续激活型PKB/Aktm RNA注射组p-Girdin-1 417表达增强,但是并不影响Girdin蛋白的总的表达。说明si RNA介导的PKB/Akt表达敲低非常明显地降低了Girdin蛋白的磷酸化。激光共聚焦研究显示在Akt m RNA和Girdin si RNA共注射组微丝骨架分布明显散乱。本研究结果充分说明Girdin蛋白在小鼠受精卵中受到PKB/Akt的调节,PKB/Akt通过磷酸化Girdin蛋白改变微丝骨架的聚集。
