Epigenetic silencing of ARRDC3 expression in basal-like breast cancer cells.

Abstract:

:Arrestin domain-containing 3 (ARRDC3) is a tumor suppressor whose expression is either lost or suppressed in basal-like breast cancer (BLBC). However, the mechanism by which BLBC suppresses ARRDC3 expression is not established. Here, we show that expression of ARRDC3 in BLBC cells is suppressed at the transcriptional level. Suppression of ARRDC3 expression in BLBC cells involves epigenetic silencing as inhibitors of class III histone deacetylases (HDACs) significantly restores ARRDC3 levels in BLBC cells. SIRT2, among class III HDACs, plays a major role in epigenetic silencing of ARRDC3 in MDA-MB-231 cells. Acetylation levels of the ARRDC3 promoter in BLBC cells is significantly lower than that of other sub-types of BC cells. Chromatin immunopreciptitation analysis established SIRT2 binding at ARRDC3 promoter in BLBC cells. Our studies indicate that SIRT2 dependent epigenetic silencing of ARRDC3 is one of the important events that may contribute to the aggressive nature of BLBC cells.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Soung YH,Pruitt K,Chung J

doi

10.1038/srep03846

subject

Has Abstract

pub_date

2014-01-24 00:00:00

pages

3846

issn

2045-2322

pii

srep03846

journal_volume

4

pub_type

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