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dc.contributor.authorHarryman, William L
dc.contributor.authorGard, Jaime M C
dc.contributor.authorPond, Kelvin W
dc.contributor.authorSimpson, Skyler J
dc.contributor.authorHeppner, Lucas H
dc.contributor.authorHernandez-Cortes, Daniel
dc.contributor.authorLittle, Andrew S
dc.contributor.authorEschbacher, Jennifer M
dc.contributor.authorCress, Anne E
dc.date.accessioned2018-09-12T17:15:56Z
dc.date.available2018-09-12T17:15:56Z
dc.date.issued2017-11-01
dc.identifier.citationHarryman WL, Gard JMC, Pond KW, et al. Targeting the Cohesive Cluster Phenotype in Chordoma via β1 Integrin Increases Ionizing Radiation Efficacy. Neoplasia (New York, NY). 2017;19(11):919-927. doi:10.1016/j.neo.2017.08.005.en_US
dc.identifier.issn1476-5586
dc.identifier.pmid28954241
dc.identifier.doi10.1016/j.neo.2017.08.005
dc.identifier.urihttp://hdl.handle.net/10150/628677
dc.description.abstractChordoma is a rare, radiation-resistant, skull-base and spinal tumor with high local recurrence containing mixed cell-adhesion phenotypes. We characterized DNA damage response (DDR) signaling (γH2AX, pKAP1, pATM) and survival response to ionizing radiation (IR) in human chordoma samples (42 resections, 23 patients) to test if blocking cell adhesion sensitizes U-CH1 tumor cells to IR. U-CH1 cells expressed brachyury, YAP, and laminin adhesion receptors (CD49c, CD49f, CD44), and approximately 15% to 20% of U-CH1 cells featured an α6 integrin-dependent (CD49f) cohesive cluster phenotype, which confers therapeutic resistance and aids metastasis. DDR to IR in U-CH1 cells was compared to normal prostate epithelial (PrEC) and tumor cells (DU145). Flow cytometry showed a dose- and time-dependent increase in γH2AX and pKAP1 expression in all cell lines. However, nearly 50% of U-CH1 cells exhibited nonresponsive phenotype to IR (measured by γH2AX and pKAP1) independent of cell cycle status. Immunofluorescence microscopy verified that only 15% of U-CH1 clustered cells were γH2AX or pKAP1 positive (versus 80% of nonclustered cells) 2 hours following 2-Gy IR. Conversely, both tumor cell lines were uniformly defective in pATM response. HYD1, a synthetic ECM ligand, inhibited DDR through an unresolved γH2AX response. β1 integrin-blocking antibody (AIIB2) decreased cell survival 50% itself and approximately doubled the IR-induced cell kill at all IR doses observed at 2 and 4 weeks posttreatment. These results suggest that a heterogeneity of DDR to IR exists within a chordoma population. Blocking integrin function alone and/or as an adjuvant to IR may eradicate chordomas containing the cohesive cluster phenotype.en_US
dc.description.sponsorshipNational Institutes Health [P30CA23074, RO1CA159406, T32CA09213, T35HL007479]en_US
dc.language.isoenen_US
dc.publisherELSEVIER SCIENCE INCen_US
dc.relation.urlhttps://www.neoplasia.com/article/S1476-5586(17)30187-2/abstracten_US
dc.rights© 2017 The Authors. Published by Elsevier Inc. on behalf of Neoplasia Press, Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectchordomaen_US
dc.subjectDNA damage responseen_US
dc.subjectcohesive cluster phenotypeen_US
dc.subjectβ1 integrinen_US
dc.subjectγH2AXen_US
dc.titleTargeting the Cohesive Cluster Phenotype in Chordoma via β1 Integrin Increases Ionizing Radiation Efficacy.en_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Canc Ctr, 1515 N Campbell Ave, Tucson, AZ 85724 USAen_US
dc.contributor.departmentUniv Arizona, Dept Cellular & Mol Med, 1515 N Campbell Ave, Tucson, AZ 85724 USAen_US
dc.contributor.departmentUniv Arizona, Coll Med, Med Student Res Program, 1515 N Campbell Ave, Tucson, AZ 85724 USAen_US
dc.contributor.departmentUniv Arizona, Canc Biol Res Program, 1515 N Campbell Ave, Tucson, AZ 85724 USAen_US
dc.identifier.journalNeoplasiaen_US
dc.description.noteOpen access journal.en_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleNeoplasia (New York, N.Y.)
refterms.dateFOA2018-09-12T17:15:57Z


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© 2017 The Authors. Published by Elsevier Inc. on behalf of Neoplasia Press, Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Except where otherwise noted, this item's license is described as © 2017 The Authors. Published by Elsevier Inc. on behalf of Neoplasia Press, Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).