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Tumor Biology

, Volume 35, Issue 9, pp 8733–8742 | Cite as

MicroRNA-520a-5p displays a therapeutic effect upon chronic myelogenous leukemia cells by targeting STAT3 and enhances the anticarcinogenic role of capsaicin

  • Burçin Tezcanlı Kaymaz
  • Vildan Bozok Çetintaş
  • Çağdaş Aktan
  • Buket Kosova
Research Article

Abstract

Aberrant expression profiles of microRNAs (miRNAs) have been previously demonstrated for having essential roles in a wide range of cancer types including leukemia. Antiproliferative or proapoptotic effects of capsaicin have been reported in several cancers. We aimed to study miRNAs involved in the Janus kinase/signal transducers and activators of transcription (JAK/STAT) pathway in chronic myeloid leukemia cell model and the effects of the capsaicin treatment on cell proliferation and miRNA regulation. miR-520a-5p expression was extremely downregulated in capsaicin-treated cells. Repressing the level of miR-520a-5p by transient transfection with specific miRNA inhibitor oligonucleotides resulted in induced inhibition of proliferation in leukemic cells. According to bioinformatics analysis, STAT3 messenger RNA was predicted as a putative miR-520a-5p target; which was confirmed by quantitative reverse transcriptase–polymerase chain reaction (qRT-PCR) and Western blot analysis. Cell proliferation inhibition was enhanced upon knockdown of STAT3 by RNA interference applications, but when miR-520a-5p inhibitor was additionally transfected onto STAT3 silenced cells, cell viability was dramatically decreased in leukemia cells. Finally, we observed the effects of capsaicin following miR-520a-5p inhibitor transfection upon cell proliferation, apoptosis, and STAT3 expression levels. We determined that, downregulation of miR-520a-5p affected the proliferation inhibition enhanced by capsaicin and reduced STAT3 mRNA and protein expression levels and increased apoptotic cell number. In summary, miR-520a-5p displays a therapeutic effect by targeting STAT3 and impacting the anticancer effects of capsaicin; whereas capsaicin, potentially through the miR-520a-5p/STAT3 interaction, induces apoptosis and inhibits K562 leukemic cell proliferation with need of further investigation.

Keywords

Chronic myeloid leukemia miRNA siRNA Capsaicin qRT-PCR Cell proliferation Apoptosis 

Notes

Acknowledgment

We gratefully thank Prof. Dr. Cumhur Gündüz from Ege University Medical School, Medical Biology Department, for his assistance in apoptosis assay by directing us in flow cytometer analyses results.

Supplementary material

13277_2014_2138_MOESM1_ESM.docx (17 kb)
ESM 1 (DOCX 16 kb)

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2014

Authors and Affiliations

  • Burçin Tezcanlı Kaymaz
    • 1
  • Vildan Bozok Çetintaş
    • 1
  • Çağdaş Aktan
    • 1
  • Buket Kosova
    • 1
  1. 1.Medical Biology DepartmentEge University School of MedicineIzmirTurkey

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