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- W2024640167 abstract "Inflammatory cells are involved in the pathogenesis of tissue injury through release of cytokines and biologically active compounds. This study used a novel, non-invasive method to assess the association between granulocyte transmigration and structural and molecular changes in radiation enteropathy. A 4 cm loop of rat small intestine was exposed to 0, 2.8, 12, or 23 Gy localized irradiation. Feces was collected in metabolic cages before and 3, 7, 14, 28, and 42 days after irradiation. Granulocyte marker protein (GMP) was measured in buffer extracts of feces by enzyme-linked immunosorbent assay (ELISA). Irradiated and shielded intestine were procured at 2 and 26 weeks and assessed for histopathologic injury [radiation injury score (RIS)], ED-2 positive macrophages, and interleukin-1α (IL-1α) positive cells. Irradiated intestine exhibited characteristic histopathologic alterations and increased numbers of macrophages and IL-1α positive cells. There was a highly significant dose-dependent increase in post-radiation GMP (P < 0.0001). Maximal GMP excretion occurred 3–7 days after irradiation. Six weeks after irradiation, GMP excretion had returned to normal in the 2.8 and 12 Gy groups, but was still 3.5 times higher in the 23 Gy group than in controls. The associations between early GMP excretion and RIS and fibrosis at 26 weeks were highly significant (P < 0.001 and P < 0.0001, respectively). Post-radiation granulocyte transmigration is dose-dependent and correlates with structural and molecular changes, as well as with subsequent chronic injury. The GMP assay is a sensitive, non-invasive indicator of acute intestinal radiation injury and a promising biological predictor of chronic toxicity. Our data underscore the importance of consequential mechanisms in radiation enteropathy. Radiat. Oncol. Invest. 5:275–282, 1997. © 1997 Wiley-Liss, Inc." @default.
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- W2024640167 date "1997-01-01" @default.
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- W2024640167 title "Association of granulocyte transmigration with structural and cellular parameters of injury in experimental radiation enteropathy" @default.
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- W2024640167 doi "https://doi.org/10.1002/(sici)1520-6823(1997)5:6<275::aid-roi3>3.0.co;2-v" @default.
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