Modulation of hypoxia-signaling pathways by extracellular linc-RoR

Kenji Takahashi, Irene K. Yan, Hiroaki Haga, Tushar C Patel

Research output: Contribution to journalArticle

126 Citations (Scopus)

Abstract

Resistance to adverse environmental conditions, such as hypoxia, contributes to the reduced efficacy of anticancer therapies and tumor progression. Although deregulated expression of many long noncoding RNA (lncRNA) occurs in human cancers, the contribution of such RNA to tumor responses to hypoxia are unknown. RNA expression profiling identified several hypoxiaresponsive lncRNAs, including the long intergenic noncoding RNA, regulator of reprogramming (linc-RoR), which is also increased in expression in malignant liver cancer cells. Linc-RoR expression was increased in hypoxic regions within tumor cell xenografts in vivo. Tumor cell viability during hypoxia was reduced by small interfering RNA (siRNA) to linc-RoR. Compared with controls, siRNA to linc-RoR decreased phosphorylation of p70S6K1 (RPS6KB1), PDK1 and HIF-1a protein expression and increased expression of the linc-RoR target microRNA-145 (miR-145). Linc- RoR was highly expressed in extracellular RNA released by hepatocellular cancer (HCC) cells during hypoxia. Incubation with extracellular vesicle preparations containing extracellular RNA increased linc-RoR, HIF-1a expression and cell survival in recipient cells. These studies show that linc-RoR is a hypoxia-responsive lncRNA that is functionally linked to hypoxia signaling in HCC through a miR-145-HIF-1α signaling module. Furthermore, this work identifies a mechanistic role for the extracellular transfer of linc-RoR in intercellular signaling to promote cell survival during hypoxic stress.

Original languageEnglish (US)
Pages (from-to)1585-1594
Number of pages10
JournalJournal of Cell Science
Volume127
Issue number7
DOIs
StatePublished - 2014

Fingerprint

Long Noncoding RNA
Liver Neoplasms
RNA
Cell Survival
Neoplasms
MicroRNAs
Small Interfering RNA
Hypoxia
Cell Hypoxia
Heterografts
Phosphorylation

Keywords

  • Cell stress
  • Exosome
  • Extracellular vesicle
  • Gene expression
  • Hypoxia
  • Linc-RoR
  • Liver cancer
  • microRNA

ASJC Scopus subject areas

  • Cell Biology

Cite this

Modulation of hypoxia-signaling pathways by extracellular linc-RoR. / Takahashi, Kenji; Yan, Irene K.; Haga, Hiroaki; Patel, Tushar C.

In: Journal of Cell Science, Vol. 127, No. 7, 2014, p. 1585-1594.

Research output: Contribution to journalArticle

Takahashi, Kenji ; Yan, Irene K. ; Haga, Hiroaki ; Patel, Tushar C. / Modulation of hypoxia-signaling pathways by extracellular linc-RoR. In: Journal of Cell Science. 2014 ; Vol. 127, No. 7. pp. 1585-1594.
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