An MRI evaluation of grey matter damage in African Americans with MS.

An MRI evaluation of grey matter damage in African Americans with MS.
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DOI:
10.1016/j.msard.2018.06.007
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发表时间:
2018-10
影响因子:
4
通讯作者:
Inglese M
Inglese M
中科院分区:
医学3区
文献类型:
--
作者:
Petracca M;Zaaraoui W;Cocozza S;Vancea R;Howard J;Heinig MM;Fleysher L;Oesingmann N;Ranjeva JP;Inglese M

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多发性硬化症(MS)在非洲裔美国人(AAs)中的流行率低于高加索人(CAs),但在前者中,疾病过程往往更严重。为了阐明AA疾病严重程度的MRI相关性,我们进行了多模式脑MRI研究,以全面评估患有MS的AA中灰质(GM)损伤的程度和对结构损伤的功能适应程度。在这项横断面研究中,我们在一个简单的运动任务的执行过程中,对一个样本的GM损伤的特点是局灶性病变和体积损失和功能适应。20例AA和20例CA伴MS和20例健康对照(CTR)。在AA中,我们观察到EDSS评分的范围比CA更广,AA中多系统受累的可能性更大(p<0.01)。虽然在病灶负荷和全脑体积方面没有检测到显著差异,但与CA相比,AA显示小脑后小叶、颞枕和额叶区域的区域性萎缩(p<0.01),小脑萎缩是区分AA和CA的最佳指标(右侧和左侧小脑簇分别为p=0.007,AUC=0.96和p=0.005,AUC=0.96)。在AAs中,皮层激活的功能分析显示,与CA相比,参与高水平处理的区域的任务相关激活增加,内侧前额叶皮层的激活减少。在我们的研究中,AAs和CA的直接比较指出小脑萎缩是亚组之间的主要差异。
Multiple sclerosis (MS) is less prevalent in African Americans (AAs) than Caucasians (CAs) but in the former the disease course tends to be more severe. In order to clarify the MRI correlates of disease severity in AAs, we performed a multimodal brain MRI study to comprehensively assess the extent of grey matter (GM) damage and the degree of functional adaptation to structural damage in AAs with MS. In this cross-sectional study, we characterized GM damage in terms of focal lesions and volume loss and functional adaptation during the execution of a simple motor task on a sample of 20 AAs and 20 CAs with MS and 20 healthy controls (CTRLs). In AAs, we observed a wider range of EDSS scores than CAs, with multisystem involvement being more likely in AAs (p<0.01). While no significant differences were detected in lesion loads and global brain volumes, AAs showed regional atrophy in the posterior lobules of cerebellum, temporo-occipital and frontal regions in comparison with CAs (p<0.01), with cerebellar atrophy being the best metric in differentiating AAs from CAs (p=0.007, AUC=0.96 and p=0.005, AUC=0.96, respectively for right and left cerebellar clusters). In AAs, the functional analysis of cortical activations showed an increase in task-related activation of areas involved in high level processing and a decreased activation in the medial prefrontal cortex compared to CAs. In our study, the direct comparison of AAs and CAs points to cerebellar atrophy as the main differences between subgroups.
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