Assessment of glycosaminoglycan concentration changes in the intervertebral disc via chemical exchange saturation transfer.

Assessment of glycosaminoglycan concentration changes in the intervertebral disc via chemical exchange saturation transfer.
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通过化学交换饱和转移评估椎间盘糖胺聚糖浓度的变化。

DOI:
10.1002/nbm.1741
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发表时间:
2012-02
期刊:
影响因子:
2.9
通讯作者:
Jerschow, Alexej
Jerschow, Alexej
中科院分区:
医学3区
文献类型:
--
作者:
Saar, Galit;Zhang, Boyang;Ling, Wen;Regatte, Ravinder R.;Navon, Gil;Jerschow, Alexej

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在本研究中,羟基质子的CEST方法可用于检测椎间盘中糖胺聚糖(GAG)浓度的变化。该方法被称为gagCEST,通过将CEST效应与髓核(NP)的固定电荷密度(FCD)以及组织CEST图像与其相应的23Na图像进行关联,在体外证明了该方法。5种NP样品与胰蛋白酶孵育后产生了不同GAG含量的样品(N=19),−OH CEST效应与FCD以及N-乙酰基信号幅度之间存在良好的相关性。与常规成像相比,体外GagCEST图像进一步说明了从这种对比机制获得的细节量。NP中高浓度的GAG和相对较长的水T1使该方法非常敏感,特别是用于评估该组织中的GAG损耗。NP中GAG的丧失表明椎间盘退变的早期阶段。
It is shown in the present work that the CEST method for hydroxyl protons can be used to detect changes in glycosaminoglycan (GAG) concentrations in the intervertebral disc. The method, termed gagCEST, was demonstrated ex vivo by correlating the CEST effect with the fixed charge density (FCD) of the nucleus pulposus (NP), as well as, correlating tissue CEST images with their corresponding 23Na images. Incubation of the five NP samples with trypsin produced samples with varying GAG content (N=19), and a good correlation was found between the −OH CEST effect and FCD as well as with the N-acetyl signal amplitude. GagCEST images in vitro further illustrate the amount of detail obtainable from this contrast mechanism when compared to conventional imaging. The large concentration of GAG and the relatively long T1 of water in the NP, make the method sensitive, in particular, for assessing the GAG depletion in this tissue. It is the loss of GAG in the NP that indicates the early stage of disc degeneration.
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