Hypometabolism and Altered Cerebrospinal Fluid Markers in Normal Apolipoprotein E E4 Carriers with Subjective Memory Complaints
Background We examined whether cerebral metabolic rates for glucose (CMRglc) on 2-[18 F]fluoro-2-deoxy-D-glucose (FDG)-positron emission tomography (PET) and cerebrospinal fluid (CSF) markers of Alzheimer’s disease (AD) are altered in cognitively normal apolipoprotein E (ApoE) E4 carriers with subje...
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Published in | Biological psychiatry (1969) Vol. 63; no. 6; pp. 609 - 618 |
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Main Authors | , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
New York, NY
Elsevier Inc
15.03.2008
Elsevier Science |
Subjects | |
Online Access | Get full text |
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Summary: | Background We examined whether cerebral metabolic rates for glucose (CMRglc) on 2-[18 F]fluoro-2-deoxy-D-glucose (FDG)-positron emission tomography (PET) and cerebrospinal fluid (CSF) markers of Alzheimer’s disease (AD) are altered in cognitively normal apolipoprotein E (ApoE) E4 carriers with subjective memory complaints (SMC). Methods Twenty-eight middle-aged normal subjects (NL) were examined, including 13 E4 carriers (E4+; 6 with SMC [SMC+] and 7 without SMC [SMC−]) and 15 noncarriers (E4−; 7 SMC+ and 8 SMC−). Subjects received an FDG-PET scan and a lumbar puncture to measure CSF total (T-Tau) and hyperphosphorylated tau231 (P-Tau), 40 and 42 amino acid forms of β-amyloid (Aβ40 and Aβ42), and F2 -isoprostane (IP). Results As compared with E4−, E4+ subjects showed decreased CMRglc in AD-related brain regions and associated higher CSF IP, P-Tau, T-Tau, and P-Tau/Aβ42 levels ( p ’s < .05). As compared with SMC−, SMC+ subjects showed reduced parietotemporal and parahippocampal gyrus (PHG) CMRglc. A significant ApoE by SMC status interaction was found, with the E4+/SMC+ showing the lowest PHG CMRglc and the highest CSF IP, P-Tau, and P-Tau/Aβ42 levels as compared with all other subgroups ( p ’s ≤ .05). The combination of CSF and CMRglc measures significantly improved the accuracy of either measures alone in discriminating ApoE groups (86% accuracy, odds ratio [OR] = 4.1, p < .001) and E4+/SMC+ from all other subgroups (86% accuracy, OR = 3.7, p = .005). Parahippocampal gyrus CMRglc was the most accurate discriminator of SMC groups (75% accuracy, OR = 2.4, p < .001). Conclusions Normal E4 carriers with SMC show altered AD-related CSF and FDG-PET measures. Longitudinal studies are needed to assess whether these brain abnormalities foreshadow clinical decline. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0006-3223 1873-2402 |
DOI: | 10.1016/j.biopsych.2007.05.030 |