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

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 J...

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Veröffentlicht in:Tumor biology 2014-09, Vol.35 (9), p.8733-8742
Hauptverfasser: Kaymaz, Burçin Tezcanlı, Çetintaş, Vildan Bozok, Aktan, Çağdaş, Kosova, Buket
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container_end_page 8742
container_issue 9
container_start_page 8733
container_title Tumor biology
container_volume 35
creator Kaymaz, Burçin Tezcanlı
Çetintaş, Vildan Bozok
Aktan, Çağdaş
Kosova, Buket
description 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.
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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. 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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.</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><pmid>24870597</pmid><doi>10.1007/s13277-014-2138-z</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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subjects Anticarcinogenic Agents - pharmacology
Apoptosis
Apoptosis - drug effects
Apoptosis - genetics
Biomedical and Life Sciences
Biomedicine
Blotting, Western
Cancer
Cancer Research
Capsaicin - pharmacology
Cell Proliferation - drug effects
Cell Survival - drug effects
Cell Survival - genetics
Cells
Dose-Response Relationship, Drug
Down-Regulation
Drug therapy
Gene Expression Regulation, Leukemic
Humans
K562 Cells
Leukemia
Leukemia, Myelogenous, Chronic, BCR-ABL Positive - genetics
Leukemia, Myelogenous, Chronic, BCR-ABL Positive - pathology
MicroRNAs - genetics
Polymerase chain reaction
Research Article
Reverse Transcriptase Polymerase Chain Reaction
Ribonucleic acid
RNA
RNA Interference
RNA, Messenger - genetics
RNA, Messenger - metabolism
STAT3 Transcription Factor - genetics
STAT3 Transcription Factor - metabolism
Time Factors
title MicroRNA-520a-5p displays a therapeutic effect upon chronic myelogenous leukemia cells by targeting STAT3 and enhances the anticarcinogenic role of capsaicin
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