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2014 ; 11
(6
): 777-87
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gab.com Text
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English Wikipedia
Long intergenic non-coding RNA HOTAIRM1 regulates cell cycle progression during
myeloid maturation in NB4 human promyelocytic leukemia cells
#MMPMID24824789
Zhang X
; Weissman SM
; Newburger PE
RNA Biol
2014[]; 11
(6
): 777-87
PMID24824789
show ga
HOTAIRM1 is a long intergenic non-coding RNA encoded in the human HOXA gene
cluster, with gene expression highly specific for maturing myeloid cells.
Knockdown of HOTAIRM1 in the NB4 acute promyelocytic leukemia cell line retarded
all-trans retinoid acid (ATRA)-induced granulocytic differentiation, resulting in
a significantly larger population of immature and proliferating cells that
maintained cell cycle progression from G1 to S phases. Correspondingly, HOTAIRM1
knockdown resulted in retained expression of many otherwise ATRA-suppressed cell
cycle and DNA replication genes, and abated ATRA induction of cell surface
leukocyte activation, defense response, and other maturation-related genes.
Resistance to ATRA-induced cell cycle arrest at the G1/S phase transition in
knockdown cells was accompanied by retained expression of ITGA4 (CD49d) and
decreased induction of ITGAX (CD11c). The coupling of cell cycle progression with
temporal dynamics in the expression patterns of these integrin genes suggests a
regulated switch to control the transit from the proliferative phase to
granulocytic maturation. Furthermore, ITGAX was among a small number of genes
showing perturbation in transcript levels upon HOTAIRM1 knockdown even without
ATRA treatment, suggesting a direct pathway of regulation. These results indicate
that HOTAIRM1 provides a regulatory link in myeloid maturation by modulating
integrin-controlled cell cycle progression at the gene expression level.