A β-secretase modulator decreases Tau pathology and preserves short-term memory in a mouse model of neurofibrillary degeneration

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Tautou, Marie | Eddarkaoui, Sabiha | Descamps, Florian | Larchanché, Paul-Emmanuel | Dumoulin, Mélanie | Lamarre, Chloé | Blum, David | Buée, Luc | Melnyk, Patricia | Sergeant, Nicolas

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Abstract A structure-activity relationship has enabled us to identify two molecules, MAGS02-14 and PEL24-199, sharing a β-secretase modulatory effect but having or not a lysosomotropic activity, respectively. More importantly, MAGS02-14 and PEL24-199 only differ from each other by a single nitrogen atom. However, which of the lysosomotropic and/or β-secretase modulating activities is necessary for the pharmacological effect in vivo remains ill-defined. To address this question, the THY-Tau22 transgenic model of NFD was treated for 6 weeks in a curative paradigm and short-term memory, Tau burden, and inflammatory processes were studied. PEL24-199, possessing only the β-secretase modulatory activity, was shown to restore the short-term memory and to reduce NFD. This effect was associated with reduced phosphorylation of Tau, increased phosphatase expression, and a decrease of astrogliosis. Our results therefore suggest that the lysosomotropic activity may be dispensable for the effect on both Aβ and Tau pathologies.

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