Identification of BBOX1 as a Therapeutic Target in Triple-Negative Breast Cancer.

Abstract:

:Triple-negative breast cancer (TNBC) is an aggressive and highly lethal disease. Because of its heterogeneity and lack of hormone receptors or HER2 expression, targeted therapy is limited. Here, by performing a functional siRNA screening for 2-OG-dependent enzymes, we identified gamma-butyrobetaine hydroxylase 1 (BBOX1) as an essential gene for TNBC tumorigenesis. BBOX1 depletion inhibits TNBC cell growth while not affecting normal breast cells. Mechanistically, BBOX1 binds with the calcium channel inositol-1,4,5-trisphosphate receptor type 3 (IP3R3) in an enzymatic-dependent manner and prevents its ubiquitination and proteasomal degradation. BBOX1 depletion suppresses IP3R3-mediated endoplasmic reticulum calcium release, therefore impairing calcium-dependent energy-generating processes including mitochondrial respiration and mTORC1-mediated glycolysis, which leads to apoptosis and impaired cell-cycle progression in TNBC cells. Therapeutically, genetic depletion or pharmacologic inhibition of BBOX1 inhibits TNBC tumor growth in vitro and in vivo. Our study highlights the importance of targeting the previously uncharacterized BBOX1-IP3R3-calcium oncogenic signaling axis in TNBC. SIGNIFICANCE: We provide evidence from unbiased screens that BBOX1 is a potential therapeutic target in TNBC and that genetic knockdown or pharmacologic inhibition of BBOX1 leads to decreased TNBC cell fitness. This study lays the foundation for developing effective BBOX1 inhibitors for treatment of this lethal disease.This article is highlighted in the In This Issue feature, p. 1611.

journal_name

Cancer Discov

journal_title

Cancer discovery

authors

Liao C,Zhang Y,Fan C,Herring LE,Liu J,Locasale JW,Takada M,Zhou J,Zurlo G,Hu L,Simon JM,Ptacek TS,Andrianov VG,Loza E,Peng Y,Yang H,Perou CM,Zhang Q

doi

10.1158/2159-8290.CD-20-0288

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

1706-1721

issue

11

eissn

2159-8274

issn

2159-8290

pii

2159-8290.CD-20-0288

journal_volume

10

pub_type

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