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Critical Reviews™ in Eukaryotic Gene Expression

Publicado 6 números por año

ISSN Imprimir: 1045-4403

ISSN En Línea: 2162-6502

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.6 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 2.2 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00058 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.33 SJR: 0.345 SNIP: 0.46 CiteScore™:: 2.5 H-Index: 67

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miR-335-5p Targets SDC1 to Regulate the Progression of Breast Cancer

Volumen 32, Edición 6, 2022, pp. 21-31
DOI: 10.1615/CritRevEukaryotGeneExpr.2022041813
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SINOPSIS

The objective of the study was to explore the role of SDC1 in breast cancer cells. Our study also investigated the regulatory relationship between SDC1 and the microRNA (miRNA) miR-335-5p as well as the impact of these two genes on the progression of breast cancer. Bioinformatic approaches were employed to analyze the differentially expressed messenger RNAs (mRNAs) and miRNAs (DE-mRNAs and DE-miRNAs) in breast cancer tissue. Then mRNA SC1 was obtained. Differentially downregulated mRNAs were intersected with target miRNAs predicted by databases, and miR-335-5p was determined as the study object. Quantitative reverse transcription polymerase chain reaction was applied to assess the expressions of SDC1 and miR-335-5p in each cell line. Next, Western blot assay was conducted to detect the protein level of SDC1 and dual-luciferase assay was performed to verify the binding relationship between miR-335-5p and SDC1. Finally, we conducted methyl thiazolyl tetrazolium (MTT), colony formation, and Transwell assays and flow cytometry to further investigate the impacts of SDC1 and miR-335-5p on the progression of breast cancer. SDC1 was significantly highly expressed while miR-335-5p was remarkably lowly expressed in human breast cancer. Silencing SDC1 in breast cancer blocked the proliferation, migration and invasion of the cells. In breast cancer, SDC1 was a target gene of miR-335-5p and silencing miR-335-5p notably increased SDC1 expression. Compared with the silence of miR-335-5p, simultaneous silences of miR-335-5p and SDC1 significantly reduced the proliferative, migratory and invasive abilities of breast cancer cells. The result revealed the interaction between miR-335-5p and SDC1 in the progression of breast cancer, which may contribute to the treatments for this cancer.

Figures

  • SDC1 is notably upregulated in breast cancer. (A) Box plots of SDC1 expressions in normal and tumor
groups, in which blue boxplot represents normal group and red one indicates tumor group. (B) Survival curve of
the effect of SDC1 expression on patients’ prognosis, with red line standing for high expression group and blue one
representing low expression group. (C) Relative expressions of SDC1 mRNA in human mammary epithelium MCF-
10A and human breast cancer cell line BT474, MDA-MB-468, SKBR-3 and MCF7. *P < 0.05 compared with human
mammary epithelium.
  • SDC1 influences the proliferation, migration and invasion. (A) Relative expression of SDC1 mRNA in transfected cells of breast cancer was assessed in qRT-PCR assay. (B) Viability of breast cancer cells was detected via MTT
assay. (C) The colony numbers of transfected cells of breast cancer were confrmed in colony formation assay. (D) The
migratory ability of breast cancer cells was examined in transwell migration assay (40×). (E) The invasive ability of
breast cancer cells was estimated in transwell invasion assay (100×). *P < 0.05 compared with control group sh-NC.
  • SDC1 serves as a direct target of miR-335-5p in breast cancer. (A) Volcano plot of the DE-miRNAs in normal
and tumor groups inTCGA-BRCA data set, with red and green dots respectively representing up- and downregulated miRNAs. (B) Venn diagram about the predicted regulatory genes in the upstream of SDC1 and downregulated
DE-miRNAs. (C) Pearson correlation analysis between SDC1 and the predicted miRNAs. (D) Box plot of miR-
335-5p expressions in normal tissue and tumor tissue, in which blue indicates normal group and red indicates tumor
group. (E) The potential target of miR-335-5p was predicted via bioinformatic approach. (F) Dual-luciferase assay
was conducted to predict the binding relationship between miR-335-5p and SDC1 in breast cancer cells. (G) qRTPCR was applied to assess the relative expression of SDC1 mRNA after silencing miR-335-5p. (H) Western blot was
employed to validate the protein expression of miR-335-5p after miR-335-5p was silenced. *P < 0.05 compared with
control group NC inhibitor
  • The regulation of SDC1 by miR-335-5p influences the proliferation, migration and invasion. (A) qRT-PCR
assay was launched to examine mRNA expression of SDC1 after breast cancer cells were transfected. (B) Western blot
assay was performed to assess the protein expression of SDC1 after transfection of breast cancer cells. (C) MTT assay
was conducted to estimate the proliferative capability of breast cancer cells. (D) Colony formation assay was implemented to determine the number of colonies. (E) Transwell migratory assay was carried out for the evaluation of the
migratory capability of the cells (40×). (F) Transwell invasion assay was performed to detect the invasive capability
of transfected cells of breast cancer (100×). *P < 0.05 compared with NC inhibitor+sh-NC group and the miR-335-5p
inhibitor+sh-NC group
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