Downregulated expression of ARHGAP10 correlates with advanced stage and high Ki-67 index in breast cancer

PeerJ

article

Yujing Li¹  Beilei Zeng¹  Yunhai Li¹  Chong Zhang¹  Guosheng Ren¹ 

[1] Chongqing Key Laboratory of Molecular Oncology and Epigenetics, The First Affiliated Hospital of Chongqing Medical University;Department of Ultrasound, The First Affiliated Hospital of Chongqing Medical University;Department of Endocrine and Breast Surgery, The First Affiliated Hospital of Chongqing Medical University

关键词: ARHGAP10;    Breast cancer;    TCGA;    Oncomine;    Immunohistochemistry;    GEO2R;    GSEA;   

DOI  :  10.7717/peerj.7431

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

BackgroundRho GTPase-activating protein 10 (ARHGAP10), which catalyzes the conversion of active Rho GTPase to the inactive form, is downregulated in some cancers. However, little is known about ARHGAP10 in breast cancer.MethodsThe transcriptional expression level of ARHGAP10 in breast cancer was analyzed with the data downloaded from The Cancer Genome Atlas (TCGA) and Oncomine, then verified by reverse-transcription quantitative polymerase chain reaction (RT-qPCR) in 30 pairs of breast cancer tissues and the corresponding adjacent normal tissues. ARHGAP10 protein expression was examined by immunohistochemistry (IHC) in 190 breast cancer and 30 corresponding adjacent normal breast tissue samples. The associations between ARHGAP10 expression and clinicopathological characteristics of patients were analyzed, and Kaplan–Meier Plotter was used to assess the relationship between ARHGAP10 and relapse-free survival (RFS). Different expression levels of ARHGAP10 in response to chemotherapy agents were determined by GEO2R online tool. The potential biological functions of ARHGAP10 were analyzed by Gene Set Enrichment Analysis (GSEA) using data downloaded from TCGA.ResultsARHGAP10 mRNA and protein expression was lower in breast cancer tissues than in adjacent normal tissues. Low expression of ARHGAP10 was associated with advanced clinical TNM (cTNM) stage (pb = 0.001) and high Ki-67 index (p = 0.015). Low expression of ARHGAP10 indicated worse RFS (p = 0.0015) and a poor response to chemotherapy (p = 0.006). GSEA results showed that ARHGAP10 was involved in signaling pathways including protein export, nucleotide excision repair, base excision repair, focal adhesion, JAK-STAT pathway and the actin cytoskeleton.

【 授权许可】

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