期刊
JOURNAL OF ALZHEIMERS DISEASE
卷 46, 期 4, 页码 1049-1070出版社
IOS PRESS
DOI: 10.3233/JAD-143225
关键词
Alzheimer's disease; choline; creatine; glutamate and glutamine; magnetic resonance spectroscopy; meta-analysis; myo-inositol; N-acetyl aspartate
资金
- National Natural Science Foundation of China [81471309, 81371406, 81171209]
- Shandong Provincial Outstanding Medical Academic Professional Program
- Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders
- Qingdao Key Health Discipline Development Fund
- Qingdao Outstanding Health Professional Development Fund
Background: The application of non-invasive proton magnetic resonance spectroscopy (H-1-MRS) could potentially identify changes in cerebral metabolites in the patients with Alzheimer's disease (AD). However, whether these metabolites can serve as biomarkers for the diagnosis of AD remains unclear. Objective: Using meta-analysis, we aimed to investigate the patterns of cerebral metabolite changes in several cerebral regions that are strongly associated with cognitive decline in AD patients. Methods: Using Hedges' g effect size, a systematic search was performed in PubMed, Cochrane Library, Ovid, Embase, and EBSCO, and 38 studies were integrated into the final meta-analysis. Results: According to the observational studies, N-acetyl aspartate (NAA) in AD patients was significantly reduced in the posterior cingulate (PC) (effect size (ES) = -0.924, p < 0.005) and bilateral hippocampus (left hippocampus: ES = -1.329, p < 0.005; right hippocampus: ES = -1.287, p < 0.005). NAA/Cr (creatine) ratio decreased markedly in the PC (ES = -1.052, p < 0.005). Simultaneously, significant elevated myo-inositol (mI)/Cr ratio was found not only in the PC but also in the parietal gray matter. For lack of sufficient data, we failed to elucidate the efficacy of pharmacological interventions with the metabolites changes. Conclusion: The available data indicates that NAA, mI, and the NAA/Cr ratio might be potential biomarkers of brain dysfunction in AD subjects. Choline (Cho)/Cr and mI/NAA changes might also contribute toward the diagnostic process. Thus, large, well-designed studies correlated with cerebral metabolism are needed to better estimate the cerebral extent of alterations in brain metabolite levels in AD patients.
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