Elevated expression of MITF counteracts B-RAF-stimulated melanocyte and melanoma cell proliferation.

Elevated expression of MITF counteracts B-RAF-stimulated melanocyte and melanoma cell proliferation.
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MITF的表达升高抵消B-RAF刺激的黑色素细胞和黑色素瘤细胞增殖。

DOI:
10.1083/jcb.200505059
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发表时间:
2005-08-29
影响因子:
7.8
通讯作者:
Marais, R
Marais, R
中科院分区:
生物学1区
文献类型:
--
作者:
Wellbrock, C;Marais, R

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蛋白激酶B-RAF是一种人类致癌基因,在约70%的人类黑色素瘤中发生突变,并转化小鼠黑色素细胞。小眼相关转录因子(MITF)是一种重要的黑素细胞分化和存活因子,但其在黑色素瘤中的作用尚不清楚。在这项研究中,我们发现在永生化小鼠和原代人黑色素细胞中,MITF的表达被致癌的B-RAF抑制。然而,低水平的MITF持续存在于含有致癌B-RAF的人类黑色素瘤细胞中,这表明有其他机制调节其表达。在b - raf转化的黑色素细胞中,MITF的再表达抑制了它们的增殖。此外,在黑色素瘤细胞中,升高MITF表达的分化诱导因子抑制其增殖,但当MITF上调被RNA干扰阻止时,增殖不受抑制。这些数据表明,MITF是一种被B-RAF信号下调的抗增殖因子,这是含有致癌B-RAF的黑色素瘤进展的关键事件。
The protein kinase B-RAF is a human oncogene that is mutated in ∼70% of human melanomas and transforms mouse melanocytes. Microphthalmia-associated transcription factor (MITF) is an important melanocyte differentiation and survival factor, but its role in melanoma is unclear. In this study, we show that MITF expression is suppressed by oncogenic B-RAF in immortalized mouse and primary human melanocytes. However, low levels of MITF persist in human melanoma cells harboring oncogenic B-RAF, suggesting that additional mechanisms regulate its expression. MITF reexpression in B-RAF–transformed melanocytes inhibits their proliferation. Furthermore, differentiation-inducing factors that elevate MITF expression in melanoma cells inhibit their proliferation, but when MITF up-regulation is prevented by RNA interference, proliferation is not inhibited. These data suggest that MITF is an antiproliferation factor that is down-regulated by B-RAF signaling and that this is a crucial event for the progression of melanomas that harbor oncogenic B-RAF.
DOI: 10.1083/jcb.200410115
发表时间: 2005-01-03
期刊: The Journal of cell biology
影响因子: --
作者:
Loercher AE;Tank EM;Delston RB;Harbour JW
通讯作者: Harbour JW
DOI: 10.1038/nature03269
发表时间: 2005-02-17
期刊: NATURE
影响因子: 64.8
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DOI: 10.1158/0008-5472.can-03-3433
发表时间: 2004-04-01
期刊: CANCER RESEARCH
影响因子: 11.2
作者:
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发表时间: 2002-06-14
期刊: CELL
影响因子: 64.5
作者:
McGill, GG;Horstmann, M;Fisher, DE
通讯作者: Fisher, DE