MiR-340 inhibits tumor cell proliferation and induces apoptosis by targeting multiple negative regulators of p27 in non-small cell lung cancer

S. Fernandez, M. Risolino, N. Mandia, F. Talotta, Y. Soini, M. Incoronato, G. Condorelli, S. Banfi, P. Verde

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

MicroRNAs (miRNAs) control cell cycle progression by targeting the transcripts encoding for cyclins, CDKs and CDK inhibitors, such as p27 KIP1 (p27). p27 expression is controlled by multiple transcriptional and posttranscriptional mechanisms, including translational inhibition by miR-221/222 and posttranslational regulation by the SCF SKP2 complex. The oncosuppressor activity of miR-340 has been recently characterized in breast, colorectal and osteosarcoma tumor cells. However, the mechanisms underlying miR-340-induced cell growth arrest have not been elucidated. Here, we describe miR-340 as a novel tumor suppressor in non-small cell lung cancer (NSCLC). Starting from the observation that the growth-inhibitory and proapoptotic effects of miR-340 correlate with the accumulation of p27 in lung adenocarcinoma and glioblastoma cells, we have analyzed the functional relationship between miR-340 and p27 expression. miR-340 targets three key negative regulators of p27. The miR-340-mediated inhibition of both Pumilio family RNA-binding proteins (PUM1 and PUM2), required for the miR-221/222 interaction with the p27 3′-UTR, antagonizes the miRNA-dependent downregulation of p27. At the same time, miR-340 induces the stabilization of p27 by targeting SKP2, the key posttranslational regulator of p27. Therefore, miR-340 controls p27 at both translational and posttranslational levels. Accordingly, the inhibition of either PUM1 or SKP2 partially recapitulates the miR-340 effect on cell proliferation and apoptosis. In addition to the effect on tumor cell proliferation, miR-340 also inhibits intercellular adhesion and motility in lung cancer cells. These changes correlate with the miR-340-mediated inhibition of previously validated (MET and ROCK1) and potentially novel (RHOA and CDH1) miR-340 target transcripts. Finally, we show that in a small cohort of NSCLC patients (n=23), representative of all four stages of lung cancer, miR-340 expression inversely correlates with clinical staging, thus suggesting that miR-340 downregulation contributes to the disease progression.

Original languageEnglish
Pages (from-to)3240-3250
Number of pages11
JournalOncogene
Volume34
Issue number25
DOIs
Publication statusPublished - Jun 20 2015

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Non-Small Cell Lung Carcinoma
Cell Proliferation
Apoptosis
MicroRNAs
Lung Neoplasms
Neoplasms
S-Phase Kinase-Associated Proteins
Down-Regulation
Cyclins
RNA-Binding Proteins
3' Untranslated Regions
Osteosarcoma
Glioblastoma
Growth
Cell Cycle Checkpoints
Disease Progression
Colorectal Neoplasms
Breast Neoplasms

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Genetics
  • Medicine(all)

Cite this

MiR-340 inhibits tumor cell proliferation and induces apoptosis by targeting multiple negative regulators of p27 in non-small cell lung cancer. / Fernandez, S.; Risolino, M.; Mandia, N.; Talotta, F.; Soini, Y.; Incoronato, M.; Condorelli, G.; Banfi, S.; Verde, P.

In: Oncogene, Vol. 34, No. 25, 20.06.2015, p. 3240-3250.

Research output: Contribution to journalArticle

Fernandez, S, Risolino, M, Mandia, N, Talotta, F, Soini, Y, Incoronato, M, Condorelli, G, Banfi, S & Verde, P 2015, 'MiR-340 inhibits tumor cell proliferation and induces apoptosis by targeting multiple negative regulators of p27 in non-small cell lung cancer', Oncogene, vol. 34, no. 25, pp. 3240-3250. https://doi.org/10.1038/onc.2014.267
Fernandez, S. ; Risolino, M. ; Mandia, N. ; Talotta, F. ; Soini, Y. ; Incoronato, M. ; Condorelli, G. ; Banfi, S. ; Verde, P. / MiR-340 inhibits tumor cell proliferation and induces apoptosis by targeting multiple negative regulators of p27 in non-small cell lung cancer. In: Oncogene. 2015 ; Vol. 34, No. 25. pp. 3240-3250.
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AU - Fernandez, S.

AU - Risolino, M.

AU - Mandia, N.

AU - Talotta, F.

AU - Soini, Y.

AU - Incoronato, M.

AU - Condorelli, G.

AU - Banfi, S.

AU - Verde, P.

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