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ATP5A1 and ATP5B are highly expressed in glioblastoma tumor cells and endothelial cells of microvascular proliferation

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Abstract

Glioblastoma (GBM) is the most common primary malignant brain tumor. Microvascular proliferation is one of the characteristic pathologic features of GBM. Mitochondrial dysfunction plays an important role in the pathogenesis of GBM. In this study, microvascular proliferation from GBM and normal brain blood vessels were laser microdissected and total RNA was isolated from these microvasculatures. The difference of mRNA expression profiles among GBM microvasculature, normal brain blood vessels and GBM tumor cells was evaluated by mitochondria and metabolism PCR gene arrays. It was found that the mRNA levels of ATP5A1 and ATP5B in GBM tumor cells as well as microvascular proliferation were significantly higher compared with normal brain blood vessels. Immunohistochemical stains with anti-ATP5A1 antibody or anti-ATP5B antibody were performed on tissue microarray, which demonstrated strongly positive expression of ATP5A1 and ATP5B in GBM tumor cells and GBM microvascular proliferation while normal blood vessels were negative. By analyzing The Cancer Genome Atlas data sets for GBM and other cancers, genomic DNA alterations (mutation, amplification or deletion) were less likely the reason for the high expression of ATP5A1 and ATP5B in GBM. Our miRNA microarray data showed that miRNAs that target ATP5A1 or ATP5B were down-regulated, which might be the most likely reason for the high expression of ATP5A1 and ATP5B in GBM tumor cells and microvascular proliferation. These findings help us better understand the pathogenesis of GBM, and agents against ATP5A1 and/or ATP5B might effectively kill both tumor cells and microvascular proliferation in GBM. MiRNAs, such as Let-7f, miR-16, miR-23, miR-100 and miR-101, that target ATP5A1 or ATP5B, might be potential therapeutic agents for GBM.

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Acknowledgments

We give special thanks to Dr. Betty Diamond, who provided the lab space and equipments. We also appreciate help and support from all her lab members. We are thankful for Mr. Daniel Loen and Ms. Jill Wishinsky for managing the Grant. Dept. of Pathology and Lab. Medicine: We thank Dr. James Crawford for his support and encouragement, Ms. Claudine Alexis for ordering all our materials, and people in histology laboratory for technical support.

Funding

This work was supported by North Shore-LIJ Cancer Institute.

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Authors and Affiliations

  1. Department of Pathology and Laboratory Medicine, North Shore-Long Island Jewish Health System, Hofstra North Shore-LIJ School of Medicine, Lake Success, NY, 11040, USA

    Guiyan Xu & Jian Yi Li

  2. North Shore-LIJ Cancer Institute, North Shore-Long Island Jewish Health System, Hofstra North Shore-LIJ School of Medicine, Lake Success, NY, USA

    Jian Yi Li

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  1. Guiyan Xu
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Correspondence to Jian Yi Li.

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Xu, G., Li, J.Y. ATP5A1 and ATP5B are highly expressed in glioblastoma tumor cells and endothelial cells of microvascular proliferation. J Neurooncol 126, 405–413 (2016). https://doi.org/10.1007/s11060-015-1984-x

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  • DOI: https://doi.org/10.1007/s11060-015-1984-x

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