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Deprecated: Implicit conversion from float 261.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell+Rep 2016 ; 15 (11): 2500-9 Nephropedia Template TP
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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 PMID27264189show 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, up-regulated in mesenchymal GSCs. Its deregulation affects GSC growth, self-renewal and hypoxia-dependent molecular reprogramming. Amongst 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. Down-regulation 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/targets and indirectly by modulating responses to hypoxic stress depending on the subtype-specific genetic context.