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Rosager AM, Sørensen MD, Dahlrot RH, Boldt HB, Hansen S, Lathia JD, Kristensen BW. Expression and prognostic value of JAM-A in gliomas. J Neurooncol 2017; 135:107-117. [PMID: 28677106 PMCID: PMC5658466 DOI: 10.1007/s11060-017-2555-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 06/27/2017] [Indexed: 12/26/2022]
Abstract
Gliomas are among the most lethal cancers, being highly resistant to both chemo- and radiotherapy. The expression of junctional adhesion molecule-A (JAM-A) was recently identified on the surface of stem cell-like brain tumor-initiating cells and suggested to function as a unique glioblastoma niche adhesion factor influencing the tumorigenic potential of brain tumor-initiating cells. We have recently identified high JAM-A expression to be associated with poor outcome in glioblastomas, and our aim was to further investigate the expression of JAM-A in gliomas focusing especially on the prognostic value in WHO grade II and III gliomas. JAM-A protein expression was evaluated by immunohistochemistry and advanced quantitative image analysis with continuous estimates of staining intensity. The JAM-A antibody stained tumor cell membranes and cytoplasm to various extent in different glioma subtypes, and the intensity was higher in glioblastomas than low-grade gliomas. We could not detect an association with overall survival in patients with grade II and III tumors. Double-immunofluorescence stainings in glioblastomas revealed co-expression of JAM-A with CD133, SOX2, nestin, and GFAP in tumor cells as well as some co-expression with the microglial/macrophage marker IBA-1. In conclusion, JAM-A expression was higher in glioblastomas compared to low-grade gliomas and co-localized with recognized stem cell markers suggesting an association of JAM-A with glioma aggressiveness. No significant association between JAM-A expression and overall survival was found in grade II and III gliomas. Further research is needed to determine the function and clinical impact of JAM-A in gliomas.
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Affiliation(s)
- Ann Mari Rosager
- Department of Pathology, Odense University Hospital, Winsløwparken 15, 3rd floor, 5000, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Winsløwparken 19, 3rd floor, 5000, Odense, Denmark
| | - Mia D Sørensen
- Department of Pathology, Odense University Hospital, Winsløwparken 15, 3rd floor, 5000, Odense, Denmark.
- Department of Clinical Research, University of Southern Denmark, Winsløwparken 19, 3rd floor, 5000, Odense, Denmark.
| | - Rikke H Dahlrot
- Department of Oncology, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense, Denmark
| | - Henning B Boldt
- Department of Pathology, Odense University Hospital, Winsløwparken 15, 3rd floor, 5000, Odense, Denmark
| | - Steinbjørn Hansen
- Department of Clinical Research, University of Southern Denmark, Winsløwparken 19, 3rd floor, 5000, Odense, Denmark
- Department of Oncology, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense, Denmark
| | - Justin D Lathia
- Department of Cellular and Molecular Medicine, Lerner Research Institute, 9500 Euclid Avenue, NC10, Cleveland, OH, 44195, USA
| | - Bjarne W Kristensen
- Department of Pathology, Odense University Hospital, Winsløwparken 15, 3rd floor, 5000, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Winsløwparken 19, 3rd floor, 5000, Odense, Denmark
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The effect of high vacuum on the mechanical properties and bioactivity of collagen fibril matrices. Biointerphases 2013; 8:2. [PMID: 24706115 DOI: 10.1186/1559-4106-8-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 01/17/2013] [Indexed: 11/10/2022] Open
Abstract
The extracellular matrix (ECM) environment plays a critical role in organism development and disease. Surface sensitive microscopy techniques for studying the structural and chemical properties of ECMs are often performed in high vacuum (HV) environments. In this report, we examine the affect HV conditions have on the bioactivity and mechanical properties of type I collagen fibrillar matrices. We find that HV exposure has an unappreciable affect on the cell spreading response and mechanical properties of these collagen fibril matrices. Conversely, low vacuum environments cause fibrils to become mechanically rigid as indicated by force microscopy, resulting in greater cell spreading. Time-of-flight secondary ion mass spectrometry results show no noticeable spectral differences between HV-treated and dehydrated matrices. While previous reports have shown that HV can denature proteins in monolayers, these observations indicate that HV-exposure does not mechanically or biochemically alter collagen in its supramolecular configuration. These results may have implication for complex ECM matrices such as decellularized scaffolds.
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