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NOTCH1 activation compensates BRCA1 deficiency and promotes triple-negative breast cancer formation.

Abstract：

:BRCA1 mutation carriers have a higher risk of developing triple-negative breast cancer (TNBC), which is a refractory disease due to its non-responsiveness to current clinical targeted therapies. Using the Sleeping Beauty transposon system in Brca1-deficient mice, we identified 169 putative cancer drivers, among which Notch1 is a top candidate for accelerating TNBC by promoting the epithelial-mesenchymal transition (EMT) and regulating the cell cycle. Activation of NOTCH1 suppresses mitotic catastrophe caused by BRCA1 deficiency by restoring S/G2 and G2/M cell cycle checkpoints, which may through activation of ATR-CHK1 signalling pathway. Consistently, analysis of human breast cancer tissue demonstrates NOTCH1 is highly expressed in TNBCs, and the activated form of NOTCH1 correlates positively with increased phosphorylation of ATR. Additionally, we demonstrate that inhibition of the NOTCH1-ATR-CHK1 cascade together with cisplatin synergistically kills TNBC by targeting the cell cycle checkpoint, DNA damage and EMT, providing a potent clinical option for this fatal disease.

journal_name

Nat Commun

journal_title

Nature communications

authors

Miao K,Lei JH,Valecha MV,Zhang A,Xu J,Wang L,Lyu X,Chen S,Miao Z,Zhang X,Su SM,Shao F,Rajendran BK,Bao J,Zeng J,Sun H,Chen P,Tan K,Chen Q,Wong KH,Xu X,Deng CX

doi

10.1038/s41467-020-16936-9

subject

Has Abstract

pub_date

2020-06-26 00:00:00

pages

3256

issue

1

issn

2041-1723

pii

10.1038/s41467-020-16936-9

journal_volume

11

pub_type

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