Two-site exchange revisited: a new method for extracting exchange parameters in biological systems.

Two-site exchange revisited: a new method for extracting exchange parameters in biological systems.
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重新审视两点交换:一种提取生物系统中交换参数的新方法。

DOI:
10.1016/s0006-3495(89)82797-3
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发表时间:
1989
影响因子:
3.4
通讯作者:
Jolesz,FA
Jolesz,FA
中科院分区:
生物学3区
文献类型:
--
作者:
Mulkern,RV;Bleier,AR;Adzamli,IK;Spencer,RG;Sandor,T;Jolesz,FA

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本文提出了一种新的分析方法,将实际体积分数、驰豫速率和腔内交换率与由横向磁化衰减曲线的双指数拟合得到的表观体积分数和驰豫速率直接联系起来。这种分析与以往的方法不同之处在于,用两个顺磁掺杂能级的测量来闭合两个位置的交换方程。新方法和Herbst和Goldstein(HG)之前描述的方法都已应用于顺磁掺杂的全血数据集。两种方法计算的交换参数有显著差异。从新的分析中推断,细胞内松弛速率与细胞外顺磁剂浓度之间存在微小的依赖关系,而HG方法假设这种依赖关系是不存在的。这项分析也适用于已发表的关于灌流大鼠心脏的数据,我们对该系统中的两点交换进行了有限的评估。
A new analysis is presented which links real volume fractions, relaxation rates, and intracompartmental exchange rates directly with apparent volume fractions and relaxation rates obtained from biexponential fits of transverse magnetization decay curves. The analysis differs from previous methods in that measurements from two paramagnetic doping levels are used to close the two-site exchange equations. Both the new method and one previously described by Herbst and Goldstein (HG) have been applied to paramagnetically doped whole-blood data sets. Significant differences in the calculated exchange parameters are found between the two methods. A small dependence of the intracellular relaxation rate on extracellular paramagnetic agent concentration, assumed nonexistent with the HG method, is inferred from the new analysis. The analysis was also applied to published data on perfused rat hearts, and we obtained a limited assessment of two-site exchange in this system.
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