title: Heterogeneity of radiation induced apoptosis in Ewing Tumor cell lines characterized on a single cell level.
abstract: The objective of this study was to investigate heterogeneity of radiation induced apoptosis on a single cell level. Two Ewing tumor cell lines were characterized in vitro before and 24 and 72 h after radiation with 5 Gy by multiparametric flow cytometry. Annexin V, 7-AAD and fluorescence conjugated antibodies that were directed against HLA-ABC, CD11a and CD62L were used. Based on these markers radiation induced apoptosis was quantified, multiple apoptotic subpopulations were identified and a characteristic individual apoptotic profile was characterized. The characterization of HLA-ABC, CD11a and CD62L was informative to detect subpopulations of apoptotic cells. The observed heterogeneity and the identification of multiple apoptotic subpopulations reflect the complexity and diversity of biology of radiation induced cell death. This might be an indication for co-existing apoptotic pathways or it might represent sequential steps of the apoptotic cascade.
authors.affiliation: Department of Radiotherapy, University Hospital Münster, 48149, Münster, Germany. stkoene@uni-muenster.de
authors.forename: S
authors.initials: S
authors.lastname: Könemann
authors.forename: T
authors.initials: T
authors.lastname: Bölling
authors.forename: A
authors.initials: A
authors.lastname: Kolkmeyer
authors.forename: D
authors.initials: D
authors.lastname: Riesenbeck
authors.forename: S
authors.initials: S
authors.lastname: Hesselmann
authors.forename: J
authors.initials: J
authors.lastname: Vormoor
authors.forename: N
authors.initials: N
authors.lastname: Willich
authors.forename: A
authors.initials: A
authors.lastname: Schuck
mesh_terms: D017209:Apoptosis / Q000528:radiation effects*; D015415:Biomarkers / Q000032:analysis*; D045744:Cell Line, Tumor; D005434:Flow Cytometry; D006801:Humans; D016130:Immunophenotyping; D011839:Radiation, Ionizing; D012512:Sarcoma, Ewing / Q000378:metabolism* / Q000473:pathology / Q000532:radiotherapy*; D013997:Time Factors
chemical_list: D015415:Biomarkers