A cross-talk between TrkB and Ret tyrosine kinases receptors mediates neuroblastoma cells differentiation.

A cross-talk between TrkB and Ret tyrosine kinases receptors mediates neuroblastoma cells differentiation.
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DOI:
10.1371/journal.pone.0001643
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发表时间:
2008-02-20
期刊:
影响因子:
3.7
通讯作者:
Cerchia L
Cerchia L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Esposito CL;D'Alessio A;de Franciscis V;Cerchia L

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了解由多种受体酪氨酸激酶(RTK)启动的细胞内信号之间的相互作用,以获得最终的细胞表型是一个主要的药理学挑战。视黄酸(RA)处理神经母细胞瘤(NB)细胞涉及Ret和TrkB RTK的活化作为诱导细胞分化的关键步骤。通过研究TrkB和Ret之间的信号相互作用作为范例,在这里,我们证明了诱导细胞分化所需的两个不相关的受体之间的串扰机制的存在。事实上,我们发现TrkB受体通过不需要GDNF的机制促进Ret磷酸化。这揭示了一个关键机制,因为通过小干扰RNA阻断TrkB或Ret会导致NB生物化学和形态分化失败。我们的研究结果提供了第一个证据,不同的酪氨酸激酶受体之间的功能性反式激活是一个重要的生理过程所必需的。
Understanding the interplay between intracellular signals initiated by multiple receptor tyrosine kinases (RTKs) to give the final cell phenotype is a major pharmacological challenge. Retinoic acid (RA)-treatment of neuroblastoma (NB) cells implicates activation of Ret and TrkB RTKs as critical step to induce cell differentiation. By studying the signaling interplay between TrkB and Ret as paradigmatic example, here we demonstrate the existence of a cross-talk mechanism between the two unrelated receptors that is needed to induce the cell differentiation. Indeed, we show that TrkB receptor promotes Ret phosphorylation by a mechanism that does not require GDNF. This reveals to be a key mechanism, since blocking either TrkB or Ret by small interfering RNA causes a failure in NB biochemical and morphological differentiation. Our results provide the first evidence that a functional transactivation between distinct tyrosine kinases receptors is required for an important physiological process.
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