文章基本信息

标题：Hypoxia Expression in Radiation-induced Late Rectal Injury
其他标题：Hypoxia Expression in Radiation-induced Late Rectal Injury
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作者：Yong LIU ; Kohsei KUDO ; Yoshinao ABE 等
期刊名称：Journal of Radiation Research
印刷版ISSN：0449-3060
电子版ISSN：1349-9157
出版年度：2008
卷号：49
期号：3
页码：261-268
DOI：10.1269/jrr.07099
摘要：Tumor hypoxia and angiogenesis have been studied extensively. However, the relation between normal tissue injury and hypoxia is still unclear. In this study, we investigated the effect of hypoxia on radiation-induced late rectal injury in mice. The rectum of C57BL/6N mice was irradiated locally with a single dose of 25 Gy and the following experiments were performed including hematoxylin-eosin (H. E.) staining, azan staining, real-time PCR, immunohistochemistry and immunofluorescene. Radiation-induced fibrotic changes were observed from 14 days and reached the peak 30 days after irradiation. The expression of transforming growth factor β1 (TGF-β1), hypoxia-inducible factor-1α (HIF-1α), vascular endothelial growth factor (VEGF) and endothelial cell marker CD31 increased significantly with the formation of fibrosis induced by irradiation compared with unirradiated control. In addition, the maximum expression of TGF-β1, HIF-1α and VEGF was found at 14, 30 and 90 days after irradiation, respectively. The temporal changes of cytokines were consistent with the dynamic change of fibrosis. Our data suggests that late normal tissue injury involved various cytokines including hypoxia-induced angiogenic cytokines. These results may have important implications in the understanding of radiation-induced late normal tissue injury.
关键词：Irradiation; Hypoxia; Late injury; Rectum; Mice