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2014 ; 74
(14
): 3935-46
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NDY1/KDM2B functions as a master regulator of polycomb complexes and controls
self-renewal of breast cancer stem cells
#MMPMID24853546
Kottakis F
; Foltopoulou P
; Sanidas I
; Keller P
; Wronski A
; Dake BT
; Ezell SA
; Shen Z
; Naber SP
; Hinds PW
; McNiel E
; Kuperwasser C
; Tsichlis PN
Cancer Res
2014[Jul]; 74
(14
): 3935-46
PMID24853546
show ga
The JmjC domain histone H3K36me2/me1 demethylase NDY1/KDM2B is overexpressed in
various types of cancer. Here we show that knocking down NDY1 in a set of 10 cell
lines derived from a broad range of human tumors inhibited their
anchorage-dependent and anchorage-independent growth by inducing senescence
and/or apoptosis in some and by inhibiting G1 progression in all. We further show
that the knockdown of NDY1 in mammary adenocarcinoma cell lines decreased the
number, size, and replating efficiency of mammospheres and downregulated the stem
cell markers ALDH and CD44, while upregulating CD24. Together, these findings
suggest that NDY1 is required for the self-renewal of cancer stem cells and are
in agreement with additional findings showing that tumor cells in which NDY1 was
knocked down undergo differentiation and a higher number of them is required to
induce mammary adenocarcinomas, upon orthotopic injection in animals.
Mechanistically, NDY1 functions as a master regulator of a set of miRNAs that
target several members of the polycomb complexes PRC1 and PRC2, and its knockdown
results in the de-repression of these miRNAs and the downregulation of their
polycomb targets. Consistent with these observations, NDY1/KDM2B is expressed at
higher levels in basal-like triple-negative breast cancers, and its
overexpression is associated with higher rates of relapse after treatment. In
addition, NDY1-regulated miRNAs are downregulated in both normal and cancer
mammary stem cells. Finally, in primary human breast cancer, NDY1/KDM2B
expression correlates negatively with the expression of the NDY1-regulated miRNAs
and positively with the expression of their PRC targets.