Oncotarget

Research Papers:

Induction of HOXA9 expression in three-dimensional organotypic culture of the Claudin-low breast cancer cells

Miao Li, Xi Li, Yan Zhuang, Yan Wang, Matthew E. Burow, Bridgette Collins-Burow, Min Xue, Chengjie Song and Bin Shan _

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Oncotarget. 2016; 7:51503-51514. https://doi.org/10.18632/oncotarget.10491

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Abstract

Miao Li1, Xi Li2, Yan Zhuang3, Yan Wang4, Matthew E. Burow3, Bridgette Collins-Burow3, Min Xue5, Chengjie Song5, Bin Shan6

1Department of Microbiology and Parasitology, College of Basic Medical Sciences, China Medical University, Shenyang, China

2Department of Sports Medicine and Joint Surgery, The People’s Hospital of Liaoning Province, Shenyang, China

3Department of Medicine, Tulane University School of Medicine, New Orleans, LA, USA

4Department of Biological Engineering, Zunyi Medical College Zhuhai Campus, Zhuhai, China

5Department of Physiology, Xuzhou Medical College, Xuzhou, China

6Department of Biomedical Sciences, Elson S. Floyd College of Medicine, Washington State University Spokane, Spokane, WA, USA

Correspondence to:

Miao Li, email: [email protected]

Bin Shan, email: [email protected]

Keywords: breast cancer, extracellular matrix, three-dimensional organotypic culture, gene expression, homeobox gene

Received: February 05, 2016     Accepted: June 29, 2016     Published: July 08, 2016

ABSTRACT

The gene expression signatures of the molecular intrinsic subtypes of breast cancer are regulated by epigenetic mechanisms such as methylation of CpG islands in gene promoters. Epigenetic codes can be regulated by the tumor microenvironment. The Claudin-low subtype is associated with triple-negative invasive ductal carcinomas in patients. Herein we explored epigenetic regulation of gene expression in the Claudin-low breast cancer cells by extracellular matrix (ECM), a key component of the tumor microenvironment. We modeled attachment to ECM using laminin rich ECM three-dimensional organotypic culture (lrECM 3D). In 2D and lrECM 3D cultures we examined expression of the homeobox (HOX) genes that epigenetically regulated in development and cancer. We demonstrated induction of the selected HOX genes in lrECM 3D culture of the Claudin-low breast cancer cells MDA-MB-231 and Hs578T. In particular activation of HOXA9 expression in lrECM 3D culture required binding of bromodomain containing 4 to the HOXA9 promoter and involved CpG hypomethylation. Our findings warrant further investigation of the ECM-regulated epigenetic coding of gene expression in the Claudin-low breast cancer.


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