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首页> 外文期刊>Molecular cell >C-Raf inhibits MAPK activation and transformation by B-Raf(V600E).
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C-Raf inhibits MAPK activation and transformation by B-Raf(V600E).

机译:C-Raf通过B-Raf(V600E)抑制MAPK激活和转化。

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摘要

Activating B-Raf mutations that deregulate the MAPK pathway commonly occur in cancer. Whether additional proteins modulate the enzymatic activity of oncogenic B-Raf is unknown. Here we show that the proto-oncogene C-Raf paradoxically inhibits B-Raf(V600E) kinase activity through the formation of B-Raf(V600E)-C-Raf complexes. Although all Raf family members associate with oncogenic B-Raf, this inhibitory effect is specific to C-Raf. Indeed, a B-Raf(V600E) isoform with impaired ability to interact with C-Raf exhibits elevated oncogenic potential. Human melanoma cells expressing B-Raf(V600E) display a reduced C-Raf:B-Raf ratio, and further suppression of C-Raf increases MAPK activation and proliferation. Conversely, ectopic C-Raf expression lowers ERK phosphorylation and proliferation. Moreover, both oncogenic Ras and Sorafenib stabilize B-Raf(V600E)-C-Raf complexes, thereby impairing MAPK activation. This inhibitory function of C-Raf on B-Raf(V600E)-mediated MAPK activation may explain the lack of co-occurrence of B-Raf(V600E) and oncogenic Ras mutations, and influence the successful clinical development of small molecule inhibitors for B-Raf(V600E)-driven cancers.
机译:激活MAPK通路失活的B-Raf突变通常发生在癌症中。尚不清楚其他蛋白是否能调节致癌B-Raf的酶活性。在这里,我们显示原癌基因C-Raf通过B-Raf(V600E)-C-Raf复合物的形成自相矛盾地抑制了B-Raf(V600E)激酶活性。尽管所有Raf家族成员均与致癌B-Raf相关,但这种抑制作用是C-Raf特有的。确实,与C-Raf相互作用的能力受损的B-Raf(V600E)同工型具有更高的致癌潜力。表达B-Raf(V600E)的人黑素瘤细胞显示出降低的C-Raf:B-Raf比,并且进一步抑制C-Raf可增加MAPK激活和增殖。相反,异位C-Raf表达降低ERK磷酸化和增殖。此外,致癌性Ras和索拉非尼均稳定B-Raf(V600E)-C-Raf复合物,从而损害MAPK活化。 C-Raf对B-Raf(V600E)介导的MAPK活化的抑制功能可能解释了B-Raf(V600E)与致癌Ras突变并存的缺乏,并影响了小分子B抑制剂的成功临床开发-Raf(V600E)驱动的癌症。

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