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Potential involvement of RITA in the activation of Aurora A at spindle poles during mitosis.
Oncogene ( IF 6.9 ) Pub Date : 2019-01-31 , DOI: 10.1038/s41388-019-0716-7
Nina-Naomi Kreis 1 , Kerstin Steinhäuser 1, 2 , Andreas Ritter 1 , Patricia Klöble 3 , Samira Catharina Hoock 1 , Susanne Roth 1 , Frank Louwen 1 , Franz Oswald 3 , Juping Yuan 1
Affiliation  

The mitotic kinase Aurora A is crucial for various mitotic events. Its activation has been intensively investigated and is not yet completely understood. RITA, the RBP-J interacting and tubulin-associated protein, has been shown to modulate microtubule dynamics in mitosis. We asked if RITA could be related to the activation of Aurora A. We show here that RITA is colocalized with Aurora A and its activator TPX2 at spindle poles during mitosis. FLAG-RITA is precipitated with the complex of Aurora A, TPX2 and tubulin. Depletion of RITA increases exclusively active Aurora A and TPX2 at spindle poles in diverse cancer cell lines and in RITA knockout mouse embryonic fibroblasts. The enhanced active Aurora A, its substrate p-TACC3 and TPX2 are restored by adding back of RITA but not its Δtub mutant with an impaired tubulin-binding capability, indicating that RITA's role as Aurora A's modulator is mediated through its interaction with tubulin. Also, the mitotic failures in cells depleted of RITA are rescued by the inhibition of Aurora A. RITA itself does not directly interfere with the catalytic activity of Aurora A, instead, affects the microtubule binding of its activator TPX2. Moreover, Aurora A's activation correlates with microtubule stabilization induced by the microtubule stabilizer paclitaxel, implicating that stabilized microtubules caused by RITA depletion could also account for increased active Aurora A. Our data suggest a potential role for RITA in the activation of Aurora A at spindle poles by modulating the microtubule binding of TPX2 and the microtubule stability during mitosis.

中文翻译:

RITA在有丝分裂期间可能在纺锤极的极点中激活AuroraA。

有丝分裂激酶Aurora A对于各种有丝分裂事件至关重要。已经对其激活进行了深入研究,但尚未完全了解。RITA,RBP-J相互作用和微管蛋白相关蛋白,已被证明可调节有丝分裂中的微管动力学。我们询问了RITA是否可能与Aurora A的激活有关。在这里,我们证明RITA与Aurora A及其激活剂TPX2在有丝分裂期间位于纺锤极。FLAG-RITA与Aurora A,TPX2和微管蛋白的复合物沉淀。RITA的耗竭会增加各种癌细胞系和RITA基因敲除小鼠胚胎成纤维细胞中纺锤体极的活性Aurora A和TPX2。增强的活性Aurora A,其底物p-TACC3和TPX2通过添加RITA而不是添加其微管蛋白结合能力受损的Δtub突变体来恢复,提示RITA作为Aurora A调节剂的作用是通过与微管蛋白的相互作用介导的。同样,通过抑制Aurora A可以挽救耗尽RITA的细胞的有丝分裂失败。RITA本身并不直接干扰Aurora A的催化活性,而是会影响其激活剂TPX2的微管结合。此外,Aurora A的激活与微管稳定剂紫杉醇诱导的微管稳定相关,这表明由RITA耗尽引起的稳定的微管也可能导致活跃的Aurora A增多。我们的数据表明RITA在纺锤极激活Aurora A的潜在作用。通过调节TPX2的微管结合和有丝分裂期间的微管稳定性。调节剂通过其与微管蛋白的相互作用介导。同样,通过抑制Aurora A可以挽救耗尽RITA的细胞的有丝分裂失败。RITA本身并不直接干扰Aurora A的催化活性,而是会影响其激活剂TPX2的微管结合。此外,Aurora A的激活与微管稳定剂紫杉醇诱导的微管稳定相关,这表明由RITA耗尽引起的稳定的微管也可能导致活跃的Aurora A增多。我们的数据表明RITA在纺锤极激活Aurora A的潜在作用。通过调节TPX2的微管结合和有丝分裂期间的微管稳定性。调节剂通过其与微管蛋白的相互作用介导。同样,通过抑制Aurora A可以挽救耗尽RITA的细胞的有丝分裂失败。RITA本身并不直接干扰Aurora A的催化活性,而是会影响其激活剂TPX2的微管结合。此外,Aurora A的激活与微管稳定剂紫杉醇诱导的微管稳定相关,这表明由RITA耗尽引起的稳定的微管也可能导致活跃的Aurora A增多。我们的数据表明RITA在纺锤极激活Aurora A的潜在作用。通过调节TPX2的微管结合和有丝分裂期间的微管稳定性。RITA本身并不直接干扰Aurora A的催化活性,而是会影响其激活剂TPX2的微管结合。此外,Aurora A的激活与微管稳定剂紫杉醇诱导的微管稳定有关,这暗示由RITA耗尽引起的稳定的微管也可能导致活跃的Aurora A增多。我们的数据表明RITA在纺锤极激活Aurora A的潜在作用。通过调节TPX2的微管结合和有丝分裂期间的微管稳定性。RITA本身并不直接干扰Aurora A的催化活性,而是会影响其激活剂TPX2的微管结合。此外,Aurora A的激活与微管稳定剂紫杉醇诱导的微管稳定相关,这表明由RITA耗尽引起的稳定的微管也可能导致活跃的Aurora A增多。我们的数据表明RITA在纺锤极激活Aurora A的潜在作用。通过调节TPX2的微管结合和有丝分裂期间的微管稳定性。
更新日期:2019-01-31
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