Age-related differences in metabolites in the posterior cingulate cortex and hippocampus of normal ageing brain

a 1H-MRS study

Harmen Reyngoudt*, Tom Claeys, Leslie Vlerick, Stijn Verleden, Marjan Acou, Karel Deblaere, Yves De Deene, Kurt Audenaert, Ingeborg Goethals, Eric Achten

*Corresponding author for this work

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Objective: To study age-related metabolic changes in N-acetylaspartate (NAA), total creatine (tCr), choline (Cho) and myo-inositol (Ins). Materials and methods: Proton magnetic resonance spectroscopy ( 1H-MRS) was performed in the posterior cingulate cortex (PCC) and the left hippocampus (HC) of 90 healthy subjects (42 women and 48 men aged 18-76 years, mean ± SD, 48.4 ± 16.8 years). Both metabolite ratios and absolute metabolite concentrations were evaluated. Analysis of covariance (ANCOVA) and linear regression were used for statistical analysis. Results: Metabolite ratios Ins/tCr and Ins/H 2O were found significantly increased with age in the PCC (P < 0.05 and P ≤ 0.001, respectively), and in the HC (P < 0.01 for both). An increased tCr/H 2O was only observed in the PCC (P < 0.01). Following absolute quantification based on the internal water signal, significantly increased concentrations of Ins and tCr in the PCC confirmed the relative findings (P < 0.01 for both). Conclusion: Age-related increases of tCr and Ins are found in the PCC, whereas this holds only true for Ins in the HC, indicating possible gliosis in the ageing brain. No age-dependent NAA decreases were observed in the PCC nor the HC. The 1H-MRS results in these specific brain regions can be important to differentiate normal ageing from age-related pathologies such as mild cognitive impairment (MCI) and Alzheimer's disease.

Original languageEnglish
Pages (from-to)e223-e231
Number of pages9
JournalEuropean Journal of Radiology
Volume81
Issue number3
DOIs
Publication statusPublished - Mar 2012
Externally publishedYes

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