BRN2 is a non-canonical melanoma tumor-suppressor.

BRN2 is a non-canonical melanoma tumor-suppressor.
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DOI:
10.1038/s41467-021-23973-5
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发表时间:
2021-06-17
影响因子:
16.6
通讯作者:
Larue L
Larue L
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hamm M;Sohier P;Petit V;Raymond JH;Delmas V;Le Coz M;Gesbert F;Kenny C;Aktary Z;Pouteaux M;Rambow F;Sarasin A;Charoenchon N;Bellacosa A;Sanchez-Del-Campo L;Mosteo L;Lauss M;Meijer D;Steingrimsson E;Jönsson GB;Cornell RA;Davidson I;Goding CR;Larue L

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虽然已经确定了黑色素瘤起始的主要驱动因素,包括NRAS/BRAF的激活和PTEN或CDKN 2A的丢失,但对响应于去调控信号传导而施加改变的转录状态的关键转录因子的作用还没有很好地理解。POU结构域转录因子BRN 2是黑色素瘤侵袭的关键调节因子,但其在黑色素瘤发生中的作用仍不清楚。在这里,在BrafV 600 E PtenF/+的背景下,我们表明BRN 2单倍不足促进黑色素瘤的发生和转移。然而,转移性定殖在不存在Brn 2的情况下效率较低。在机制上,BRN 2直接诱导PTEN表达,并因此抑制PI 3 K信号传导。此外,MITF,BRN 2靶标,抑制PTEN转录。总的来说,我们的研究结果表明,在PTEN杂合子背景体细胞缺失的一个BRN 2等位基因和其他等位基因的时间调节elfred黑色素瘤的启动和进展。转录因子BRN 2调节黑色素瘤的迁移和侵袭,但其在黑色素瘤发生过程中的作用尚不清楚。在这里,作者表明,BRN 2是一个单倍不足的肿瘤抑制因子,正调控PTEN表达,在BRAF突变和杂合PTEN的背景下,BRN 2的缺失促进黑色素瘤的发生和进展。
While the major drivers of melanoma initiation, including activation of NRAS/BRAF and loss of PTEN or CDKN2A, have been identified, the role of key transcription factors that impose altered transcriptional states in response to deregulated signaling is not well understood. The POU domain transcription factor BRN2 is a key regulator of melanoma invasion, yet its role in melanoma initiation remains unknown. Here, in a BrafV600E PtenF/+ context, we show that BRN2 haplo-insufficiency promotes melanoma initiation and metastasis. However, metastatic colonization is less efficient in the absence of Brn2. Mechanistically, BRN2 directly induces PTEN expression and in consequence represses PI3K signaling. Moreover, MITF, a BRN2 target, represses PTEN transcription. Collectively, our results suggest that on a PTEN heterozygous background somatic deletion of one BRN2 allele and temporal regulation of the other allele elicits melanoma initiation and progression. The transcription factor BRN2 regulates melanoma migration and invasion, but its role during melanoma initiation is unclear. Here the authors show that BRN2 is a haplo-insufficient tumour suppressor that positively regulates PTEN expression and in the context of BRAF mutation and heterozygous PTEN, BRN2 loss promotes melanoma initiation and progression.
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