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2015 ; 35
(24
): 4170-84
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Mild Glucose Starvation Induces KDM2A-Mediated H3K36me2 Demethylation through
AMPK To Reduce rRNA Transcription and Cell Proliferation
#MMPMID26416883
Tanaka Y
; Yano H
; Ogasawara S
; Yoshioka S
; Imamura H
; Okamoto K
; Tsuneoka M
Mol Cell Biol
2015[Dec]; 35
(24
): 4170-84
PMID26416883
show ga
Environmental conditions control rRNA transcription. Previously, we found that
serum and glucose deprivation induces KDM2A-mediated H3K36me2 demethylation in
the rRNA gene (rDNA) promoter and reduces rRNA transcription in the human breast
cancer cell line MCF-7. However, the molecular mechanism and biological
significance are still unclear. In the present study, we found that glucose
starvation alone induced the KDM2A-dependent reduction of rRNA transcription. The
treatment of cells with 2-deoxy-d-glucose, an inhibitor of glycolysis, reduced
rRNA transcription and H3K36me2 in the rDNA promoter, both of which were
completely dependent on KDM2A in low concentrations of 2-deoxy-d-glucose, that
is, mild starvation conditions. The mild starvation induced these KDM2A
activities through AMP-activated kinase (AMPK) but did not affect another AMPK
effector of rRNA transcription, TIF-IA. In the triple-negative breast cancer cell
line MDA-MB-231, the mild starvation also reduced rRNA transcription in a
KDM2A-dependent manner. We detected KDM2A in breast cancer tissues irrespective
of their estrogen receptor, progesterone receptor, and HER2 status, including
triple-negative cancer tissues. In both MCF-7 and MDA-MB-231 cells, mild
starvation reduced cell proliferation, and KDM2A knockdown suppressed the
reduction of cell proliferation. These results suggest that under mild glucose
starvation AMPK induces KDM2A-dependent reduction of rRNA transcription to
control cell proliferation.
|AMP-Activated Protein Kinases/genetics/*metabolism
[MESH]