Protein-induced water 1H MR frequency shifts: contributions from magnetic susceptibility and exchange effects.

Protein-induced water 1H MR frequency shifts: contributions from magnetic susceptibility and exchange effects.
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DOI:
10.1016/j.jmr.2009.10.005
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发表时间:
2010-01
期刊:
Journal of magnetic resonance (San Diego, Calif. : 1997)
影响因子:
--
通讯作者:
Yablonskiy DA
Yablonskiy DA
中科院分区:
其他
文献类型:
--
作者:
Luo J;He X;d'Avignon DA;Ackerman JJ;Yablonskiy DA

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定义人脑高场MRI研究中报告的显著MRI相位对比的生物物理学基础将导致更定量的图像分析和更知情的脉冲序列开发。为此,水的1H共振频率对蛋白质浓度的依赖性进行了研究,使用牛血清白蛋白(BSA)作为模型系统。发现两种不同的机制是水1H共振频率偏移的基础:(i)蛋白质浓度诱导的体磁化率变化,导致向较低频率的偏移,以及(ii)化学偏移不同环境之间的水交换,即,自由水(本体水)和蛋白质相关(“结合”)水,包括蛋白质上可自由交换的1H位点,导致向更高频率的偏移。在37°C时,交换效应的幅度大约是磁化率效应的一半。
Defining the biophysics underlying the remarkable MRI phase contrast reported in high field MRI studies of human brain would lead to more quantitative image analysis and more informed pulse sequence development. Toward this end, the dependence of water 1H resonance frequency on protein concentration was investigated using bovine serum albumin (BSA) as a model system. Two distinct mechanisms were found to underlie a water 1H resonance frequency shift: (i) a protein-concentration-induced change in bulk magnetic susceptibility, causing a shift to lower frequency, and (ii) exchange of water between chemical-shift distinct environments, i.e., free (bulk water) and protein-associated (“bound”) water, including freely exchangeable 1H sites on proteins, causing a shift to higher frequency. At 37°C the amplitude of the exchange effect is roughly half that of the susceptibility effect.
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