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DEC2 expression is positively correlated with HIF-1 activation and the invasiveness of human osteosarcomas
Journal article   Open access   Peer reviewed

DEC2 expression is positively correlated with HIF-1 activation and the invasiveness of human osteosarcomas

Tu Hu, Nengbin He, Yunsong Yang, Chengqian Yin, Nianli Sang and Qingcheng Yang
Journal of experimental & clinical cancer research, v 34(1), pp 22-22
28 Feb 2015
DOI: https://doi.org/10.1186/s13046-015-0135-8
PMID: 25884381
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.1186/s13046-015-0135-8View
Published, Version of Record (VoR)CC BY V4.0,  Open

Abstract

Basic Helix-Loop-Helix Transcription Factors - genetics Bone Neoplasms - genetics Bone Neoplasms - metabolism Bone Neoplasms - mortality Bone Neoplasms - pathology Cell Line, Tumor Cell Movement - genetics Gene Expression Gene Knockdown Techniques Humans Hypoxia - genetics Hypoxia - metabolism Hypoxia-Inducible Factor 1 - metabolism Hypoxia-Inducible Factor 1, alpha Subunit - genetics Hypoxia-Inducible Factor 1, alpha Subunit - metabolism Models, Biological Osteosarcoma - genetics Osteosarcoma - metabolism Osteosarcoma - mortality Osteosarcoma - pathology Prognosis Protein Stability RNA Interference RNA, Small Interfering - genetics
Osteosarcoma is the most common malignancy of bone. HIF-1 (hypoxia-inducible factor 1) activation is critical for the metabolic reprogramming and progression of solid tumors, and DEC2 (differentiated embryonic chondrocyte gene 2) has been recently reported to suppress HIF-1 in human breast and endometrial cancers. However, the roles of HIF-1 and DEC2 in human osteosarcomas remain unclear. We evaluated the correlation of DEC2 and HIF-1 expression to the prognosis, and studied the roles of DEC2 and HIF-1 activation in the invasiveness of osteosarcoma. Multiple approaches including immunohistochemical staining of clinical osteosarcoma tissues, siRNA-based knockdown and other molecular biology techniques were used. Particularly, by using a repetitive trans-well culture-based in vitro evolution system, we selected a more invasive subpopulation (U2OS-M) of osteosarcoma cells from U2OS and used it as a model to study the roles of DEC2 and HIF-1 in the invasiveness of osteosarcoma. We found that the expression of DEC2 was positively correlated with HIF-1α levels, and HIF-1α expression positively correlated with poor prognosis in osteosarcomas. DEC2 knockdown in osteosarcoma cell lines (U2OS, MNNG and 143B) attenuated HIF-1α accumulation and impaired the up-regulation of HIF-1 target genes in response to hypoxia. Compared with the low invasive parental U2OS, U2OS-M showed higher levels of DEC2 expression which were confirmed at both mRNA and protein levels. Importantly, we found that the increased DEC2 expression resulted in a more rapid accumulation of HIF-1α in U2OS-M cells in response to hypoxia. Finally, we found that HIF-1 activation is sufficient to upregulate DEC2 expression in osteosarcoma cells. Taken together, whereas DEC2 was found to promote HIF-1α degradation in other types of tumors, our data indicate that DEC2 facilitates HIF-1α stabilization and promotes HIF-1 activation in osteosarcoma. This implies that DEC2 may contribute to the progression and metastasis of human osteosarcoma by sensitizing tumor cells to hypoxia. On the other hand, HIF-1 activation may contribute to the expression of DEC2 in osteosarcoma. This is the first demonstration of a novel DEC2-HIF-1 vicious cycle in osteosarcoma and a tumor-type specific role for DEC2.

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Web of Science research areas
Oncology
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