Dose response in neutral filter elution.

Dose response in neutral filter elution.
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中性过滤器洗脱中的剂量响应。

DOI:
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发表时间:
1990
期刊:
影响因子:
3.4
通讯作者:
D. Blöcher
D. Blöcher
中科院分区:
医学3区
文献类型:
--
作者:
D. Blöcher

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在中性过滤器洗脱中,通常会观察到洗脱 DNA 分数与剂量之间的非线性关系,这通常被解释为 DNA 双链断裂 (DSB) 与剂量的非线性诱导。基于有关 DNA 片段大小分布的理论考虑,在此对该假设的结论性提出质疑。提出了一个简单的流体动力学模型,该模型生成中性过滤器洗脱的剂量响应的典型特征:(1)低剂量下的肩部,(2)中间剂量范围内的拟线性相关性,(3)高剂量下的饱和度,以及(4)半对数图中中间和较高剂量范围内的曲线线性化。即使 DSB 随剂量呈线性诱导,也可以得出这些特征。因此,即使 DSB 的诱导与辐射剂量成正比,洗脱 DNA 的分数也可能是剂量的非线性函数。
In neutral filter elution a nonlinear relationship between fraction of eluted DNA and dose is usually observed, which is often interpreted as a nonlinear induction of DNA double-strand breaks (DSBs) with dose. The conclusiveness of this hypothesis is questioned here on the basis of theoretical considerations regarding the size distribution of DNA fragments. A simple hydrodynamic model is proposed which generates the typical features of the dose response of neutral filter elution: (1) the shoulder at low doses, (2) a quasilinear correlation in an intermediate dose range, (3) a saturation at high doses, and (4) a linearization of the curve in the intermediate and higher dose range in a semilogarithmic plot. These features were derived even with the assumption of a linear induction of DSBs with dose. Thus it is demonstrated that the fraction of eluted DNA could conceivably be a nonlinear function of dose even if the induction of DSBs is directly proportional to the radiation dose.
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