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Genes 2015, 6(4), 1201-1214; doi:10.3390/genes6041201

Identification of Differentially Expressed IGFBP5-Related Genes in Breast Cancer Tumor Tissues Using cDNA Microarray Experiments

1
Department of Medical Biology, School of Medicine, Marmara University, Istanbul 34854, Turkey
2
General Surgery, School of Medicine, Marmara University, Istanbul 34899, Turkey
3
Department of Pathology, School of Medicine, Marmara University, Istanbul 34899, Turkey
*
Author to whom correspondence should be addressed.
Academic Editors: J. Peter W. Young and Nora Nock
Received: 3 September 2015 / Revised: 2 November 2015 / Accepted: 5 November 2015 / Published: 10 November 2015
(This article belongs to the Section Human Genetics and Genomics)
View Full-Text   |   Download PDF [796 KB, uploaded 11 November 2015]   |  

Abstract

IGFBP5 is an important regulatory protein in breast cancer progression. We tried to identify differentially expressed genes (DEGs) between breast tumor tissues with IGFBP5 overexpression and their adjacent normal tissues. In this study, thirty-eight breast cancer and adjacent normal breast tissue samples were used to determine IGFBP5 expression by qPCR. cDNA microarrays were applied to the highest IGFBP5 overexpressed tumor samples compared to their adjacent normal breast tissue. Microarray analysis revealed that a total of 186 genes were differentially expressed in breast cancer compared with normal breast tissues. Of the 186 genes, 169 genes were downregulated and 17 genes were upregulated in the tumor samples. KEGG pathway analyses showed that protein digestion and absorption, focal adhesion, salivary secretion, drug metabolism-cytochrome P450, and phenylalanine metabolism pathways are involved. Among these DEGs, the prominent top two genes (MMP11 and COL1A1) which potentially correlated with IGFBP5 were selected for validation using real time RT-qPCR. Only COL1A1 expression showed a consistent upregulation with IGFBP5 expression and COL1A1 and MMP11 were significantly positively correlated. We concluded that the discovery of coordinately expressed genes related with IGFBP5 might contribute to understanding of the molecular mechanism of the function of IGFBP5 in breast cancer. Further functional studies on DEGs and association with IGFBP5 may identify novel biomarkers for clinical applications in breast cancer. View Full-Text
Keywords: gene expression profiling; microarray; pathway analysis; IGFBP5; breast cancer gene expression profiling; microarray; pathway analysis; IGFBP5; breast cancer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Akkiprik, M.; Peker, İ.; Özmen, T.; Amuran, G.G.; Güllüoğlu, B.M.; Kaya, H.; Özer, A. Identification of Differentially Expressed IGFBP5-Related Genes in Breast Cancer Tumor Tissues Using cDNA Microarray Experiments. Genes 2015, 6, 1201-1214.

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