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2016 ; 15
(11
): 2500-9
Nephropedia Template TP
gab.com Text
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The Long Non-coding RNA HIF1A-AS2 Facilitates the Maintenance of Mesenchymal
Glioblastoma Stem-like Cells in Hypoxic Niches
#MMPMID27264189
Mineo M
; Ricklefs F
; Rooj AK
; Lyons SM
; Ivanov P
; Ansari KI
; Nakano I
; Chiocca EA
; Godlewski J
; Bronisz A
Cell Rep
2016[Jun]; 15
(11
): 2500-9
PMID27264189
show ga
Long non-coding RNAs (lncRNAs) have an undefined role in the pathobiology of
glioblastoma multiforme (GBM). These tumors are genetically and phenotypically
heterogeneous with transcriptome subtype-specific GBM stem-like cells (GSCs) that
adapt to the brain tumor microenvironment, including hypoxic niches. We
identified hypoxia-inducible factor 1 alpha-antisense RNA 2 (HIF1A-AS2) as a
subtype-specific hypoxia-inducible lncRNA, upregulated in mesenchymal GSCs. Its
deregulation affects GSC growth, self-renewal, and hypoxia-dependent molecular
reprogramming. Among the HIF1A-AS2 interactome, IGF2BP2 and DHX9 were identified
as direct partners. This association was needed for maintenance of expression of
their target gene, HMGA1. Downregulation of HIF1A-AS2 led to delayed growth of
mesenchymal GSC tumors, survival benefits, and impaired expression of HMGA1
in vivo. Our data demonstrate that HIF1A-AS2 contributes to GSCs' speciation and
adaptation to hypoxia within the tumor microenvironment, acting directly through
its interactome and targets and indirectly by modulating responses to hypoxic
stress depending on the subtype-specific genetic context.