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Differential Expression of Bikunin (HAI-2/PB), A Proposed Mediator of Glioma Invasion, by Demethylation Treatment

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Abstract

Effective therapies for primary brain tumors continue to be elusive. Successful adjuvant therapies for CNS tumors will require a better understanding of their basic biology. Hepatocyte growth factor activator inhibitor type-2/placental bikunin (HAI-2/PB) is a serine proteinase inhibitor that has a broad inhibitory spectra against various serine proteinases. HAI-2/PB has anti-invasive effects thought to be mediated primarily by the inhibitory activity against serine proteinase-dependent matrix degradation. It has been previously demonstrated that the expression of HAI-2/PB is inversely related to degree of malignancy and possibly involved in the progression and invasion of human gliomas [1].

Aberrant methylation patterns are an early change in glioma tumorigenesis, earlier than genetic changes [2]. Methylation within 5′ regulatory CpG islands by DNA methyltransferase is one of the most common epigenetic modifications. 5-Aza-2′-deoxycytidine (azacytidine) inhibits DNA methyltransferase and has been used in vitro to induce the expression of genes silenced by methylation. We have utilized azacytidine treatment and a micro-array system to investigate methylation influenced gene expression across several tumor cell lines of different lineage (brain, breast, prostate, liver). Using this system we have demonstrated that the expression of HAI-2/PB is under methylation control to a variable extent in glioma cell lines, in comparison to the other tested cell lines. Because the expression of HAI-2/B is inversely related to glioma invasiveness and degree of malignancy, this finding may provide insight into glioma initiation and progression as well as potentially providing new therapeutic targets.

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Authors and Affiliations

  1. Department of Neurosurgery, University of Pennsylvania, Philadelphia, USA

    James M. Schuster & Maria Longo

  2. Department of Molecular Biotechnology, Medical Oncology, The University of Washington Medical Center, Seattle, USA

    Peter S. Nelson

  3. Division of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, USA

    Peter S. Nelson

Authors
  1. James M. Schuster
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  2. Maria Longo
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  3. Peter S. Nelson
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Schuster, J.M., Longo, M. & Nelson, P.S. Differential Expression of Bikunin (HAI-2/PB), A Proposed Mediator of Glioma Invasion, by Demethylation Treatment. J Neurooncol 64, 219–225 (2003). https://doi.org/10.1023/A:1025674227750

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