Department of Neurology, Franz Tappeiner Hospital, Merano, Italy; Department of Neurology, Christian Doppler Medical Centre and Centre for Cognitive Neuroscience, Paracelsus Medical University, Salzburg, Austria; Spinal Cord Injury and Tissue Regeneration Center, Salzburg, Austria.
Department of Neurology, Christian Doppler Medical Centre and Centre for Cognitive Neuroscience, Paracelsus Medical University, Salzburg, Austria.
Brain Res Bull. 2018 Mar;137:107-119. doi: 10.1016/j.brainresbull.2017.11.013. Epub 2017 Nov 23.
Neuroimaging studies suggest that spinal cord injury (SCI) may lead to significant anatomical alterations in the human sensorimotor system. In particular, voxel-based morphometry (VBM) of cortical volume has revealed a significant gray and white matter atrophy bilaterally in the primary sensory cortex (S1). By contrast, some structural studies failed to detect changes in gray matter volume (GMV) in the primary motor cortex (M1) following SCI, whereas others have reported a substantial decrease of GMV also in M1. In addition to direct degeneration of the sensorimotor cortex, SCI can also lead to atrophy of the non-sensorimotor cortex, such as anterior cingulate cortex, insular cortex, middle frontal gyrus and supplementary motor area. These findings suggest that SCI can cause remote atrophy of brain gray matter in the salient network. Furthermore, pain-related remodelling may occur in SCI. In fact, structural changes in SCI are also related to the presence and degree of below-level pain. We performed a systematic review of the neuroimaging studies showing morphometric cortical changes and subsequent functional reorganization in humans with SCI. Literature search was conducted using PubMed and Embase. We identified 12 articles matching the inclusion criteria and 195 patients were included in these studies. The wide range of disease duration, rehabilitation training, drug intervention, and different research methodology, especially the identification of region of interest and the statistical approach to correct for multiple comparisons, may have contributed to some inconsistencies between the reviewed studies. Nevertheless, neuroimaging biomarkers can assess the extent of neural damage, elucidate the mechanisms of neural repair, and predict clinical outcome. A better understanding of the structural and functional changes that occur at cortical level following SCI may be useful in tracking potential treatment induced changes and identifying potential therapeutic targets, thus developing evidence-based rehabilitation therapies.
神经影像学研究表明,脊髓损伤 (SCI) 可能导致人类感觉运动系统出现显著的解剖学改变。具体来说,皮质体积的基于体素形态计量学 (VBM) 研究揭示了初级感觉皮层 (S1) 双侧皮质和白质的显著萎缩。相比之下,一些结构研究未能检测到 SCI 后初级运动皮层 (M1) 的灰质体积 (GMV) 变化,而其他研究则报告 M1 中的 GMV 也显著减少。除了感觉运动皮层的直接退化外,SCI 还可导致非感觉运动皮层的萎缩,如前扣带皮层、岛叶皮层、额中回和辅助运动区。这些发现表明,SCI 可导致显著网络中大脑灰质的远程萎缩。此外,SCI 还可能导致疼痛相关的重塑。事实上,SCI 的结构变化也与下位疼痛的存在和程度有关。我们对显示 SCI 患者皮质形态变化和随后的功能重组的神经影像学研究进行了系统综述。文献检索使用了 PubMed 和 Embase。我们确定了符合纳入标准的 12 篇文章,这些研究共纳入了 195 名患者。疾病持续时间、康复训练、药物干预以及不同的研究方法的广泛差异,特别是感兴趣区域的确定和用于纠正多重比较的统计方法,可能导致综述研究之间存在一些不一致。然而,神经影像学生物标志物可以评估神经损伤的程度、阐明神经修复的机制,并预测临床结果。更好地了解 SCI 后皮质水平发生的结构和功能变化,可能有助于跟踪潜在治疗诱导的变化,并识别潜在的治疗靶点,从而开发基于证据的康复治疗方法。
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