Enhancement of B7-1 (CD80) Expression on B-lymphoma Cells by Irradiation
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Irradiation of A20.2J mouse B-lymphoma cells enhanced their antigen-presenting ability to induce interleukin-2 (IL-2) production by 42-6A T cells specific for ovalbumin (OVA)323-339/I-Ad. Irradiated and fixed A20.2J cells were more efficient antigen-presenting cells (APC) to present OVA323-339 peptide than the unirradiated and fixed cells. Irradiation selectively increased the expression of B7-1 molecules, but not of the major histocompatibility complex class II molecules, B7-2, lymphocyte function-associated antigen-1, or intracellular adhesion molecule-1. Irradiation of A20.2J cells with 100 Gy followed by overnight incubation was optimal for the enhancement of B7-1 expression. Anti-B7-1 monoclonal antibody inhibited the irradiation-induced enhancement of APC function. Irradiation of A20.2J cells induced the accumulation of B7-1 mRNA. Thus, it was concluded that the enhancement of APC function by irradiation was due to the up-regulation of B7-1 molecules through the accumulation of its mRNA. Although partial inhibition of protein synthesis has been shown to enhance the accumulation of B7-1 mRNA and its expression, irradiation did not decrease the protein synthesis in A20.2J cells. The incubation with irradiated A20.2J cells stimulated unirradiated A20.2J cells to increase B7-1 expression, suggesting that irradiation of A20.2J cells induced expression or secretion of some molecule(s) to enhance B7-1 expression.
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Monjazeb A, Schalper K, Villarroel-Espindola F, Nguyen A, Shiao S, Young K Semin Radiat Oncol. 2020; 30(2):145-157.
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Youshani A, Rowlston S, OLeary C, Forte G, Parker H, Liao A J Neuroinflammation. 2019; 16(1):25.
PMID: 30722781 PMC: 6362590. DOI: 10.1186/s12974-019-1410-y.
The role of macrophage phenotype in regulating the response to radiation therapy.
Shi X, Shiao S Transl Res. 2017; 191:64-80.
PMID: 29175267 PMC: 6018060. DOI: 10.1016/j.trsl.2017.11.002.
Immune recognition of irradiated cancer cells.
Wennerberg E, Vanpouille-Box C, Bornstein S, Yamazaki T, Demaria S, Galluzzi L Immunol Rev. 2017; 280(1):220-230.
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A Century of Radiation Therapy and Adaptive Immunity.
Schaue D Front Immunol. 2017; 8:431.
PMID: 28443099 PMC: 5387081. DOI: 10.3389/fimmu.2017.00431.