title: Characterization of direct radiation-induced immune function and molecular signaling changes in an antigen presenting cell line.
abstract: Radiation therapy is a widely used cancer treatment and pre-transplantation conditioning regimen that has the potential to influence anti-tumor and post-transplantation immune responses. Although conventionally fractionated radiation doses can suppress immune responses by depleting lymphocytes, single high doses of local tumor radiation can enhance immune responses. Using phospho-flow cytometry analysis of a human monocytic cell line, we identified novel radiation-induced changes in the phosphorylation state of NFκB family members known in other cell types to maintain and regulate immune function. These phosphorylation changes were p53 independent, but were strongly dependent upon ATM activation due to DNA damage. We found that radiation promotes the activation and APC functional maturation through phosphorylation of NFκB Essential Modulator (NEMO). Our results and the analytic methods are especially well suited to the study of functional changes in APC when radiation is used for immune modulation in clinical protocols.
authors: Department of Chemical and Systems Biology, Stanford University, Stanford, CA, USA.
authors: Jennifer J
authors: JJ
authors: Parker
authors: Jennifer C
authors: JC
authors: Jones
authors: Samuel
authors: S
authors: Strober
authors: Susan J
authors: SJ
authors: Knox
mesh_terms: D000938:Antigen-Presenting Cells / Q000276:immunology* / Q000528:radiation effects*; D048708:Cell Growth Processes / Q000276:immunology / Q000528:radiation effects; D005434:Flow Cytometry; D005720:Gamma Rays; D006801:Humans; D051550:I-kappa B Kinase / Q000276:immunology*; D016328:NF-kappa B / Q000276:immunology*; D010766:Phosphorylation / Q000528:radiation effects; D017346:Protein Serine-Threonine Kinases / Q000276:immunology; D015398:Signal Transduction / Q000528:radiation effects; D016159:Tumor Suppressor Protein p53 / Q000276:immunology; D020298:U937 Cells
chemical_list: C491731:IKBKG protein, human; D016328:NF-kappa B; D016159:Tumor Suppressor Protein p53; D017346:Protein Serine-Threonine Kinases; D051550:I-kappa B Kinase
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