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miR-515-5p controls cancer cell migration through MARK4 regulation

Olivier E Pardo1, Leandro Castellano2, Catriona E Munro2

  • 1Department of Surgery & Cancer, Division of Cancer, Imperial Centre for Translational and Experimental Medicine (ICTEM), Imperial College Hammersmith Hospital Campus, London, UK o.pardo@imperial.ac.uk m.seckl@imperial.ac.uk j.stebbing@imperial.ac.uk.

EMBO Reports
|February 17, 2016
PubMed

Insights

MicroRNA-515-5p (miR-515-5p) suppresses cancer cell migration and metastasis by down-regulating MARK4. Reduced miR-515-5p in metastases and its correlation with patient survival highlight its therapeutic potential in breast and lung cancers.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • Cancer cell migration and metastasis are key drivers of cancer progression and mortality.
  • MicroRNAs (miRNAs) play crucial roles in regulating gene expression and are implicated in various cancers.
  • Understanding the specific roles of miRNAs in metastasis is essential for developing targeted therapies.

Purpose of the Study:

  • To investigate the role of miR-515-5p in regulating cancer cell migration and metastasis.
  • To identify the downstream targets of miR-515-5p involved in these processes.
  • To explore the clinical relevance of miR-515-5p and its target in breast and lung cancer patient outcomes.

Main Methods:

  • RNA sequencing (RNA-seq) to identify differentially expressed genes in breast cancer cells overexpressing miR-515-5p.
  • Luciferase reporter assays to confirm direct interaction between miR-515-5p and MARK4 3' UTR.
  • Knockdown and overexpression studies in cancer cell lines to assess functional effects on migration.
  • In vivo mouse metastatic models to evaluate the impact of miR-515-5p on tumor cell dissemination.
  • Correlation analysis of miR-515-5p and MARK4 expression with patient survival data.

Main Results:

  • Overexpression of miR-515-5p significantly inhibited cancer cell migration and metastasis in vitro and in vivo.
  • RNA-seq identified MARK4 as a direct target of miR-515-5p, with its expression down-regulated by miR-515-5p.
  • MARK4 knockdown mimicked miR-515-5p's inhibitory effects, while MARK4 overexpression rescued these effects.
  • miR-515-5p expression was found to be reduced in metastatic tumors compared to primary tumors.
  • High miR-515-5p and low MARK4 expression correlated with improved survival in breast and lung cancer patients, respectively.

Conclusions:

  • miR-515-5p acts as a tumor suppressor by inhibiting cancer cell migration and metastasis, primarily through the down-regulation of MARK4.
  • The miR-515-5p/MARK4 axis represents a critical regulatory pathway in cancer metastasis.
  • These findings suggest that miR-515-5p holds potential as a therapeutic agent or biomarker for breast and lung cancers.
Keywords:
breast cancerlung cancermiR‐515‐5pmicroRNAsmicrotubule affinity‐regulating kinase 4

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