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Abstract #4477

Investigating changes in brain lactate compartmentation using diffusion-weighted MRS in APP/PS1 mice

Sophie Malaquin1, Eloïse Mougel1, Rodrigo Lerchundi1, and Julien Valette1
1Université Paris-Saclay, CEA, CNRS, MIRCen, Laboratoire des Maladies Neurodégénératives, Fontenay-aux-Roses, France

Synopsis

Keywords: Diffusion/other diffusion imaging techniques, MicrostructureDiffusion-weighted MR spectroscopy yields information about the microstructure of the environment where brain metabolites are diffusing. Here, we measure the diffusion of two purely intracellular metabolites (astrocytic myo-inositol and neuronal N-acetyl aspartate) and of lactate, which is also present in the extracellular space, in the cortex of 12-month-old APP/PS1 and control mice. While astrocytic and neuronal microstructures appear unchanged in APP/PS1 mice, lactate diffusion appears slower. Modeling DW-signals suggests decreased extracellular lactate fraction.

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