首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >Time course of anti-inflammatory effect of low-dose radiotherapy: Correlation with TGF-beta(1) expression.
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Time course of anti-inflammatory effect of low-dose radiotherapy: Correlation with TGF-beta(1) expression.

机译:低剂量放射治疗抗炎作用的时程:与TGF-beta(1)表达的相关性。

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BACKGROUND AND PURPOSE: Low-dose radiotherapy (LD-RT) has a potent anti-inflammatory effect, and transforming growth factor (TGF)-beta(1) is a potential mediator of this effect. The objectives of this study were to characterize the in vivo effects of LD-RT on leukocyte recruitment over time, and its relationship with TGF-beta(1) production. MATERIALS AND METHODS: Mice were submitted to abdominal irradiation with a dose of 0.3Gy, or to sham radiation and studied 5, 24, 48 or 72h after irradiation. Four hours before the study a proinflammatory stimulus consisting of LPS or placebo was administered. Leukocyte-endothelial cell interactions in intestinal venules were assessed using intravital microscopy. Circulating levels and intestinal tissue production of TGF-beta(1) were determined. RESULTS: Compared to non-irradiated LPS-challenged group, the number of adherent leukocytes was significantly reduced 5, 24 and 48h, but not 72h after irradiation in LPS-challenged mice. Rolling leukocytes were significantlydecreased at all time points analyzed. Plasma TGF-beta(1) levels were increased 5 and 24h after irradiation. Increased intestinal production during this period was corroborated by in vitro culture experiments. CONCLUSIONS: LD-RT has a sustained inhibitory effect on leukocyte recruitment for 48h, which is initially associated with an increase in TGF-beta(1) intestinal production.
机译:背景与目的:低剂量放射治疗(LD-RT)具有有效的抗炎作用,而转化生长因子(TGF)-beta(1)是这种作用的潜在介体。这项研究的目的是表征LD-RT随时间对白细胞募集的体内作用及其与TGF-beta(1)产生的关系。材料与方法:小鼠接受0.3Gy剂量的腹部照射或假照射,并在照射后5、24、48或72h进行研究。在研究前四小时,给予由LPS或安慰剂组成的促炎刺激。使用活体显微镜评估肠道小静脉中白细胞-内皮细胞的相互作用。确定循环水平和肠组织生产的TGF-beta(1)。结果:与未辐照的LPS攻击组相比,LPS挑战的小鼠在照射后5、24和48h粘附白细胞的数量显着减少,而在72h时则没有减少。在所有分析的时间点,滚动白细胞均明显减少。辐射后5小时和24小时血浆TGF-β(1)水平升高。体外培养实验证实了在此期间肠道产量的增加。结论:LD-RT对白细胞募集具有持续的抑制作用,持续48h,这最初与TGF-beta(1)肠的产生增加有关。

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