Wnt5A activates the calpain-mediated cleavage of filamin A.

Wnt5A activates the calpain-mediated cleavage of filamin A.
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DOI:
10.1038/jid.2008.433
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发表时间:
2009-07
期刊:
The Journal of investigative dermatology
影响因子:
--
通讯作者:
Weeraratna AT
Weeraratna AT
中科院分区:
其他
文献类型:
--
作者:
O'Connell MP;Fiori JL;Baugher KM;Indig FE;French AD;Camilli TC;Frank BP;Earley R;Hoek KS;Hasskamp JH;Elias EG;Taub DD;Bernier M;Weeraratna AT

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我们之前已经证明 Wnt5A 和 ROR2(一种孤儿酪氨酸激酶受体)相互作用,介导黑色素瘤细胞运动。在其他细胞类型中,这可以通过 ROR2 与细胞骨架蛋白细丝蛋白 A 的相互作用来发生。在这里,我们发现细丝蛋白 A 蛋白水平与黑色素瘤细胞中的 Wnt5A 水平相关。 WNT5A 的小干扰 RNA (siRNA) 敲低可降低细丝蛋白 A 的表达。细丝蛋白 A 的敲低也对应于黑色素瘤细胞活力的降低。在转移细胞中,细丝蛋白 A 表达主要在细胞质中,蛋白质印迹分析表明这是由于这些细胞中细丝蛋白 A 的裂解所致。用重组 Wnt5A 处理非转移性黑色素瘤细胞会增加细丝蛋白 A 的裂解,这可以通过敲低 ROR2 表达来预防。此外,细胞内钙的 BAPTA-AM 螯合也抑制细丝蛋白 A 的裂解,从而导致假设 Wnt5A/ROR2 信号传导可以通过激活钙激活的蛋白酶(例如钙蛋白酶)来裂解细丝蛋白 A。事实上,WNT5A 敲低降低了钙蛋白酶 1 的表达,并且通过药理学或使用 siRNA 抑制钙蛋白酶 1,它降低了细胞运动性。我们的结果表明,Wnt5A 激活 calpain-1,导致细丝蛋白 A 的裂解,从而导致细胞骨架的重塑和黑色素瘤细胞运动性的增加。
We have previously shown that Wnt5A and ROR2, an orphan tyrosine kinase receptor, interact to mediate melanoma cell motility. In other cell types, this can occur through the interaction of ROR2 with the cytoskeletal protein filamin A. Here, we found that filamin A protein levels correlated with Wnt5A levels in melanoma cells. Small interfering RNA (siRNA) knockdown of WNT5A decreased filamin A expression. Knockdown of filamin A also corresponded to a decrease in melanoma cell motility. In metastatic cells, filamin A expression was predominant in the cytoplasm, which western analysis indicated was due to the cleavage of filamin A in these cells. Treatment of nonmetastatic melanoma cells with recombinant Wnt5A increased filamin A cleavage, and this could be prevented by the knockdown of ROR2 expression. Further, BAPTA-AM chelation of intracellular calcium also inhibited filamin A cleavage, leading to the hypothesis that Wnt5A/ROR2 signaling could cleave filamin A through activation of calcium-activated proteases, such as calpains. Indeed, WNT5A knockdown decreased calpain 1 expression, and by inhibiting calpain 1 either pharmacologically or using siRNA, it decreased cell motility. Our results indicate that Wnt5A activates calpain-1, leading to the cleavage of filamin A, which results in a remodeling of the cytoskeleton and an increase in melanoma cell motility.
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