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- W2046359904 abstract "To evaluate cluster of differentiation 4(+) (CD4(+)) T cell gene expression and related parameters after whole-body exposure to proton radiation as it occurs in the spaceflight environment.C57BL/6 mice were irradiated to total doses of 0, 0.01, 0.05, and 0.1 gray (Gy) at 0.1 cGy/h. On day 0 spleens were harvested from a subset in the 0, 0.01 and 0.1 Gy groups; (CD4(+)) T cells were isolated; and expression of 84 genes relevant to T helper (Th) cell function was determined using reverse transcriptase-polymerase chain reaction (RT-PCR). Remaining mice were euthanized on days 0, 4, and 21 for additional analyses.Genes with >2-fold difference and p < 0.05 compared to 0 Gy were noted. After 0.01 Gy, five genes were up-regulated (Ccr5, Cd40, Cebpb, Igsf6, Tnfsf4) and three were down-regulated (Il4ra, Mapk8, Nfkb1). After 0.1 Gy there were nine up-regulated genes (Ccr4, Cd40, Cebpb, Cxcr3, Socs5, Stat4, Tbx21, Tnfrsf4, Tnfsf4); none were down-regulated. On day 0 after 0.01 Gy, CD4(+) T cell counts and CD4:CD8 ratio were low in the spleen (p < 0.05). Spontaneous DNA synthesis in both spleen and blood was lowest in the 0.01 Gy group on day 0; on days 4 and 21 all p values were >0.1.The data show that the pattern of gene expression in CD4(+) T cells after protracted low-dose proton irradiation was significantly modified and highly dependent upon total dose. The findings also suggest that low-dose radiation, especially 0.01 Gy, may enhance CD4(+) T cell responsiveness." @default.
- W2046359904 created "2016-06-24" @default.
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- W2046359904 date "2009-01-01" @default.
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- W2046359904 title "Low-dose, low-dose-rate proton radiation modulates CD4<sup>+</sup>T cell gene expression" @default.
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- W2046359904 doi "https://doi.org/10.1080/09553000902748609" @default.
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