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MiR-27b targets PPAR? to inhibit growth, tumor progression and the inflammatory response in neuroblastoma cells.

ABSTRACT: The peroxisome proliferators-activated receptor (PPAR)? pathway is involved in cancer, but it appears to have both tumor suppressor and oncogenic functions. In neuroblastoma cells, miR-27b targets the 3' untranslated region of PPAR? and inhibits its mRNA and protein expression. miR-27b overexpression or PPAR? inhibition blocks cell growth in vitro and tumor growth in mouse xenografts. PPAR? activates expression of the pH regulator NHE1, which is associated with tumor progression. Lastly, miR-27b through PPAR? regulates nuclear factor-?B activity and transcription of inflammatory target genes. Thus, in neuroblastoma, miR-27b functions as a tumor suppressor by inhibiting the tumor-promoting function of PPAR?, which triggers an increased inflammatory response. In contrast, in breast cancer cells, PPAR? inhibits NHE1 expression and the inflammatory response, and it functions as a tumor suppressor. We suggest that the ability of PPAR? to promote or suppress tumor formation is linked to cell type-specific differences in regulation of NHE1 and other target genes.

SUBMITTER: Lee JJ

PROVIDER: S-EPMC3290753 | biostudies-literature | 2012 Aug

REPOSITORIES: biostudies-literature

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MiR-27b targets PPARγ to inhibit growth, tumor progression and the inflammatory response in neuroblastoma cells.

Lee J-J JJ Drakaki A A Iliopoulos D D Struhl K K

Oncogene 20111128 33

The peroxisome proliferators-activated receptor (PPAR)γ pathway is involved in cancer, but it appears to have both tumor suppressor and oncogenic functions. In neuroblastoma cells, miR-27b targets the 3' untranslated region of PPARγ and inhibits its mRNA and protein expression. miR-27b overexpression or PPARγ inhibition blocks cell growth in vitro and tumor growth in mouse xenografts. PPARγ activates expression of the pH regulator NHE1, which is associated with tumor progression. Lastly, miR-27b ...[more]

PMID: 22120719

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Project description:Neuroblastoma (NB) is the most common extracranial solid malignancy in children. Despite current aggressive treatment regimens, the prognosis for high-risk NB patients remains poor, with the survival of less than 40%. Amplification/stabilization of MYCN oncogene, in NB is associated with a high risk of recurrence. Thus, there is an urgent need for novel therapeutics. The deregulated expression of microRNA (miR) is reported in NB; nonetheless, its effect on MYCN regulation is poorly understood. First, we identified that miR-15a-5p, miR-15b-5p, and miR-16-5p (hereafter miR-15a, miR-15b or miR-16) were down-regulated in patient-derived xenografts (PDX) with high MYCN expression. MiR targeting sequences on MYCN mRNA were predicted using online databases such as TargetScan and miR database. The R2 database, containing 105 NB patients, showed an inverse correlation between MYCN mRNA and deleted in lymphocytic leukemia (DLEU) 2, a host gene of miR-15. Moreover, overexpression of miR-15a, miR-15b or miR-16 significantly reduced the levels of MYCN mRNA and N-Myc protein. Conversely, inhibiting miR dramatically enhanced MYCN mRNA and N-Myc protein levels, as well as increasing mRNA half-life in NB cells. By performing immunoprecipitation assays of argonaute-2 (Ago2), a core component of the RNA-induced silencing complex, we showed that miR-15a, miR-15b and miR-16 interact with MYCN mRNA. Luciferase reporter assays showed that miR-15a, miR-15b and miR-16 bind with 3'UTR of MYCN mRNA, resulting in MYCN suppression. Moreover, induced expression of miR-15a, miR-15b and miR-16 significantly reduced the proliferation, migration, and invasion of NB cells. Finally, transplanting miR-15a-, miR-15b- and miR-16-expressing NB cells into NSG mice repressed tumor formation and MYCN expression. These data suggest that miR-15a, miR-15b and miR-16 exert a tumor-suppressive function in NB by targeting MYCN. Therefore, these miRs could be considered as potential targets for NB treatment.

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MiR-27b targets PPAR? to inhibit growth, tumor progression and the inflammatory response in neuroblastoma cells.

Publications

MiR-27b targets PPARγ to inhibit growth, tumor progression and the inflammatory response in neuroblastoma cells.

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