Open AccessInvestigation of the efficacy of paclitaxel on some miRNAs profiles in breast cancer stem cells
Author(s) -
Elif Ertürk,
Ferda Arı,
Oğuzhan Akgün,
Engı̇n Ulukaya,
Cem İsmail Küçükali,
Ümit Zeybek
Publication year - 2021
Publication title -
turkish journal of biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.323
H-Index - 38
eISSN - 1303-6092
pISSN - 1300-0152
DOI - 10.3906/biy-2103-46
Subject(s) - sox2 , homeobox protein nanog , cd44 , paclitaxel , biology , downregulation and upregulation , cancer research , microrna , breast cancer , cancer stem cell , stem cell , microbiology and biotechnology , abcg2 , population , cancer , cell , gene , medicine , embryonic stem cell , genetics , atp binding cassette transporter , environmental health , transporter , induced pluripotent stem cell
Understanding of the functions of microRNAs in breast cancer and breast cancer stem cells have been a hope for the development of new molecular targeted therapies. Here, it is aimed to investigate the differences in the expression levels of let-7a, miR-10b, miR-21, miR-125b, miR-145, miR-155, miR-200c, miR-221, miR-222 and miR-335, which associated with gene and proteins in MCF-7 (parental) and MCF-7s (Mammosphere/stem cell-enriched population/CD44+/CD24-cells) cells treated with paclitaxel. MCF-7s were obtained from parental MCF-7 cells. Cytotoxic activity of paclitaxel was determined by ATP assay. Total RNA isolation and cDNA conversion were performed from the samples. Changes in expression levels of miRNAs were examined by RT-qPCR. Identified target genes and proteins of miRNAs were analyzed with RT-qPCR and western blot analysis, respectively. miR-125b was significantly expressed (2.0946-fold; p = 0.021) in MCF-7s cells compared to control after treatment with paclitaxel. Downregulation of SMO, STAT3, NANOG, OCT4, SOX2, ERBB2 and ERBB3 and upregulation of TP53 genes were significant after 48 h treatment in MCF-7s cells. Protein expressions of SOX2, OCT4, SMAD4, SOX2 and OCT4 also decreased. Paclitaxel induces miR-125b expression in MCF-7s cells. Upregulation of miR-125b may be used as a biomarker for the prediction of response to paclitaxel treatment in breast cancer.