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Introduction of hsa-miR-512-3p as a new regulator of HER2 signaling pathway in breast cancer.

Abstract：

PURPOSE:Dysregulation of HER2 signaling pathway in breast cancer is well documented. Our bioinformatics analysis predicted hsa-miR-512-3p (miR-512-3p) as a bona fide regulator of HER2 as well as HER3, PIK3R2, and AKT1 genes. Then, we intended to examine the effect of miR-512-3p on the predicted target genes that are involved in HER2 signaling pathway. METHODS AND RESULTS:RT-qPCR results indicated lower expression of miR-512-3p in breast cancer specimens, compared to their normal pairs. Overexpression of miR-512-3p resulted in HER2, HER3, PIK3R2, and AKT1 gene downregulation, detected by RT-qPCR and the result was confirmed by western analysis and ELIZA test against p-AKT, BAX, FADD, and HER2 proteins in SKBR3 cells, respectively. Then, dual-luciferase assay supported the direct interaction of miR-512-3p with 3'UTR sequences of HER2, HER3, PIK3R2, and AKT1 target genes. When miR-512-3p was overexpressed, BAX/BCL2 expression ratio and proportion of sub-G1 cell population were increased in transfected SKBR3 cells, detected by RT-qPCR and flow cytometry, respectively. These results were consistent with the decreased viability of transfected cells, documented by MTT assay. In addition, results were consistent with the upregulation of BAX, BAK, BOK, PTEN, P53, and P21 genes and downregulation of CCND1 gene in SKBR3 cells. Although the overexpression of miR-512 resulted in cell cycle arrest at Sub-G1 stage in MDA-MB-231 cells, this effect seemed independent of targeting HER2, HER3, PIK3R2, and AKT1 target genes. CONCLUSION:Overall, results indicated that miR-512-3p acts as a cell-type-specific tumor suppressor, through targeting HER2, HER3, PIK3R2, and AKT1 transcripts. These results suggest miR-512-3p as a potential candidate marker for breast cancer diagnosis.

journal_name

Breast Cancer Res Treat

journal_title

Breast cancer research and treatment

authors

Mohamadzade Z,Mahjoubi F,Soltani BM

doi

10.1007/s10549-020-05937-3

subject

Has Abstract

pub_date

2021-01-01 00:00:00

pages

95-106

issue

1

eissn

0167-6806

issn

1573-7217

pii

10.1007/s10549-020-05937-3

journal_volume

185

pub_type

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