Protein phosphatase-2A associates with the cytoskeleton to maintain cell spreading and reduced motility of nonmetastatic Lewis lung carcinoma cells: the loss of this regulatory control in metastatic cells.

Invasion & metastasis Pub Date : 1997-01-01
J Jackson, J Meisinger, S Patel, Z C Lim, K Vellody, R Metz, M R Young
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Abstract

Metastatic Lewis lung carcinoma (LLC-LN7) variants have previously been shown to have reduced levels of protein phosphatase-2A (PP-2A) activity as compared to the nonmetastatic LLC-C8 cells. The present study showed that inhibition of PP-2A in the nonmetastatic LLC-C8 cells caused a rapid change from a spread to a rounded morphology and increased their in vitro invasiveness through laminin. In contrast, the metastatic LLC-LN7 cells were rounded and invasive, which was not affected by inhibition of PP-2A. To determine whether these differences could be attributed to alterations in PP-2A association with the cytoskeleton, the extent of PP-2A colocalization with microtubules was tested. Immunostaining for tubulin showed prominent filamentous fibers in nonmetastatic LLC-C8 cells and small foci of PP-2A immunostaining along these microtubules. In contrast, the tubulin staining was diffuse throughout the metastatic LLC-LN7 cells and there was little evidence of association with PP-2A. Western blot analyses showed that this reduced level of PP-2A association with microtubules in metastatic LLC-LN7 cells was not due to differences in levels of the PP-2A subunits. Instead, it may be due to the reduced association of the subunits into the heterotrimeric form of the PP-2A holoenzyme. These studies show the importance of PP-2A in maintaining a spread morphology and in restricting invasiveness, and a loss of this regulatory control in metastatic cells. This loss of PP-2A regulatory control in metastatic cells may be due to a reduction in the trimeric form of the PP-2A holoenzyme.

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蛋白磷酸酶- 2a与细胞骨架相关,以维持非转移性Lewis肺癌细胞的细胞扩散和降低运动性:转移细胞中这种调节控制的丧失。
与非转移性的LLC-C8细胞相比,转移性Lewis肺癌(LLC-LN7)变体的蛋白磷酸酶2a (PP-2A)活性水平降低。本研究表明,抑制PP-2A在非转移性LLC-C8细胞中引起从扩散到圆形形态的快速变化,并通过层粘连蛋白增加其体外侵袭性。相比之下,转移的LLC-LN7细胞呈圆形和侵袭性,不受PP-2A抑制的影响。为了确定这些差异是否可以归因于PP-2A与细胞骨架关联的改变,我们测试了PP-2A与微管共定位的程度。微管蛋白免疫染色显示非转移性LLC-C8细胞中有明显的丝状纤维,PP-2A免疫染色显示沿这些微管有小灶。相比之下,微管蛋白染色在转移的LLC-LN7细胞中是弥漫性的,几乎没有证据表明与PP-2A有关。Western blot分析显示,转移性LLC-LN7细胞中PP-2A与微管关联水平的降低并非由于PP-2A亚基水平的差异。相反,这可能是由于亚基与PP-2A全酶异三聚体形式的结合减少。这些研究表明,PP-2A在维持扩散形态和限制侵袭性方面的重要性,以及转移细胞中这种调节控制的丧失。转移细胞中PP-2A调节控制的丧失可能是由于PP-2A全酶三聚体形式的减少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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