Long non-coding RNA DILC regulates liver cancer stem cells via IL-6/STAT3 axis

Journal of Hepatology
Xue WangHong-Yang Wang

Abstract

Emerging evidence has demonstrated the aberrant expression of long non-coding RNAs (lncRNAs) in various malignancies including HCC. However, the knowledge of cancer stem cell-related lncRNAs remains limited. lnc-DILC (lncRNA downregulated in liver cancer stem cells (LCSCs)) was identified by microarray and validated by real-time PCR. The role of lnc-DILC in LCSCs was assessed both in vitro and in vivo. Pull down assay and oligoribonucleotides or oligodeoxynucleotides treatment were conducted to evaluate the interaction between lnc-DILC and interleukin-6 (IL-6) promoter. Depletion of lnc-DILC markedly enhanced LCSC expansion and facilitated HCC initiation and progression, whereas ectopic expression of lnc-DILC dramatically inhibited LCSC expansion. Mechanistically, lnc-DILC inhibited the autocrine IL-6/STAT3 signaling. The putative binding locus of lnc-DILC within IL-6 promoter was confirmed by pull down assay. Consistently, the oligoribonucleotide mimics and an oligodeoxynucleotide decoy of lnc-DILC abrogated the effects on IL-6 transcription, STAT3 activation and LCSC expansion triggered by lnc-DILC depletion and lnc-DILC overexpression. Moreover, our data suggested that lnc-DILC mediated the crosstalk between TNF-α/NF-κB sign...Continue Reading

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