阿尔茨海默病所致轻度认知障碍中的神经元表面与胞内抗体：18F-FDG-PET显示脑代谢保留
横断面研究纳入97例MCI患者，用细胞法检测脑脊液和血清神经元抗体，其中20例淀粉样蛋白阳性者行18F-FDG-PET和11C-PIB-PET半定量分析。
要点
- MCI患者中神经元抗体阳性率约10.3%，临床特征与抗体阴性者难以区分。
- 抗体阳性MCI在18F-FDG-PET上代谢相对保留，右侧顶叶为著。
- 抗体阳性与阴性组11C-PIB-PET淀粉样蛋白沉积无显著差异。
关键影像表现/征象
- 亚区分析显示右侧中央后回和缘上回为局灶性代谢保留hub。
- 11C-PIB-PET未见显著组间差异。
诊断标准与关键数值
- 神经元抗体通过细胞法在脑脊液和血清中检测，阳性10例（10.3%），包括抗GABABR（n=1）、抗SOX-1（n=3）、抗Ri（n=3）、抗Titin（n=3）、抗Amphiphysin（n=1）。
- 18F-FDG-PET和11C-PIB-PET采用标准化预处理，以小脑灰质为参考计算标准化摄取值比，行全脑和ROI（额叶、顶叶、颞叶、枕叶）分析。
临床应用与阅片要点
- 对MCI患者，若18F-FDG-PET显示代谢相对保留尤其右侧顶叶，可提示抗体阳性可能。
- 抗体阳性MCI临床特征与阴性者无差异，不能仅凭临床区分。
- 11C-PIB-PET不能区分抗体阳性与阴性MCI。
局限性
- 横断面研究，无法推断因果关系。
- 仅20例淀粉样蛋白阳性MCI患者行PET分析，样本量小。
- 抗体阳性组仅10例，组间比较统计效能有限。
以上解读依据论文摘要（全文未开放获取或许可不允许翻译转载）。
英文原文（摘要）· 点击展开
BACKGROUND AND PURPOSE: Neuronal autoantibodies, which can mediate pathogenic mechanism in autoimmune encephalitis, are increasingly observed in mild cognitive impairment (MCI), yet their diagnostic or phenotypic implications in neurodegeneration remain unclear. This study aimed to evaluate the clinical and neuroimaging characteristics of antibody-positive MCI.
MATERIALS AND METHODS: This cross-sectional study included 97 patients diagnosed with MCI. Antibody was assessed by cell-based assays in both CSF and serum. Clinical features were systematically compared between antibody-positive and antibody-negative groups. Semiquantitative analyses of 18F-FDG-PET and 11C-Pittsburgh compound B (11C-PIB)-PET were performed among 20 amyloid-positive patients with MCI. All images underwent standardized preprocessing, with standardized uptake value ratios calculated using cerebellar gray matter as reference. Group-wise differences of whole-brain and ROI analyses (frontal, parietal, temporal, occipital lobes) were analyzed.
RESULTS: Neuronal antibodies were detected in 10 patients (10.3%), including anti-GABABR (n=1), anti-SOX-1 (n=3), anti-Ri (n=3), anti-Titin (n=3), and anti-Amphiphysin (n=1). Clinical profiles were highly comparable between groups; antibody-positive patients only demonstrated significantly higher abnormal tumor markers (P = .014). Compared with the antibody-negative group, the antibody-positive group exhibited relatively preserved metabolism on 18F-FDG-PET (P = .035), predominantly in the right parietal lobe (P = .030). Further subregion analysis identified the right postcentral gyrus and supramarginal gyrus as focal hubs. No significant group differences were observed on 11C-PIB-PET.
CONCLUSIONS: Antibody-positive MCI showed relatively preserved metabolism on 18F-FDG-PET, despite indistinguishable clinical features. Identification of the antibody-positive group may provide novel insights into possible antibody-mediated pathogenesis in neurodegeneration.
引用
- Luan H, Chen Z, Han X, et al. Neuronal Surface and Intracellular Antibodies in Mild Cognitive Impairment Due to Alzheimer Disease: Preserved Brain Metabolism on 18F-FDG-PET. AJNR Am J Neuroradiol. 2026. PMID: 42235964. doi:10.3174/ajnr.A9159
供执业医师工作参考，不替代临床判断；数值与分级以指南原文为准。