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Akt Mediates Ras Downregulation of RhoB, a Suppressor of Transformation, Invasion, and Metastasis

机译:Akt介导RhoB的Ras下调,RhoB是转化,侵袭和转移的抑制剂

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Although recent evidence supports a tumor-suppressive role for the GTPase RhoB, little is known about its regulation by signal transduction pathways. Here we demonstrate that Ras downregulates RhoB expression by a phosphatidylinositol 3-kinase (PI3K)- and Akt- but not Mek-dependent mechanism. Furthermore, genetic and pharmacological blockade of PI3K/Akt results in upregulation of RhoB expression. We also provide evidence for the importance of the downregulation of RhoB in oncogenesis by demonstrating that RhoB antagonizes Ras/PI3K/Akt malignancy. Ectopic expression of RhoB, but not the close relative RhoA, inhibits Ras, PI3K, and Akt induction of transformation, migration, and invasion and induces apoptosis and anoikis. Finally, RhoB inhibits melanoma metastasis to the lung in a mouse model. These studies identify suppression of RhoB as a mechanism by which the Ras/PI3K/Akt pathway induces tumor survival, transformation, invasion, and metastasis.
机译:尽管最近的证据支持GTPase RhoB的肿瘤抑制作用,但对其通过信号转导途径的调控知之甚少。在这里,我们证明Ras通过磷脂酰肌醇3-激酶(PI3K)和Akt-而不是Mek依赖性机制下调RhoB表达。此外,PI3K / Akt的遗传和药理学阻断导致RhoB表达上调。我们还通过证明RhoB拮抗Ras / PI3K / Akt恶性肿瘤,为RhoB在肿瘤发生中下调的重要性提供了证据。 RhoB的异位表达可抑制Ras,PI3K和Akt对转化,迁移和侵袭的诱导,但不会引起其近亲RhoA的异位表达,并诱导细胞凋亡和凋亡。最后,RhoB抑制了小鼠模型中黑色素向肺的转移。这些研究发现抑制RhoB是Ras / PI3K / Akt途径诱导肿瘤存活,转化,侵袭和转移的一种机制。

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