Opposing Functions of BRD4 Isoforms in Breast Cancer.

Abstract:

:Bromodomain-containing protein 4 (BRD4) is a cancer therapeutic target in ongoing clinical trials disrupting primarily BRD4-regulated transcription programs. The role of BRD4 in cancer has been attributed mainly to the abundant long isoform (BRD4-L). Here we show, by isoform-specific knockdown and endogenous protein detection, along with transgene expression, the less abundant BRD4 short isoform (BRD4-S) is oncogenic while BRD4-L is tumor-suppressive in breast cancer cell proliferation and migration, as well as mammary tumor formation and metastasis. Through integrated RNA-seq, genome-wide ChIP-seq, and CUT&RUN association profiling, we identify the Engrailed-1 (EN1) homeobox transcription factor as a key BRD4-S coregulator, particularly in triple-negative breast cancer. BRD4-S and EN1 comodulate the extracellular matrix (ECM)-associated matrisome network, including type II cystatin gene cluster, mucin 5, and cathepsin loci, via enhancer regulation of cancer-associated genes and pathways. Our work highlights the importance of targeted therapies for the oncogenic, but not tumor-suppressive, activity of BRD4.

journal_name

Mol Cell

journal_title

Molecular cell

authors

Wu SY,Lee CF,Lai HT,Yu CT,Lee JE,Zuo H,Tsai SY,Tsai MJ,Ge K,Wan Y,Chiang CM

doi

10.1016/j.molcel.2020.04.034

subject

Has Abstract

pub_date

2020-06-18 00:00:00

pages

1114-1132.e10

issue

6

eissn

1097-2765

issn

1097-4164

pii

S1097-2765(20)30276-8

journal_volume

78

pub_type

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