Combination anti-Aß treatment maximizes cognitive recovery and rebalances mTOR signaling in APP mice

Angie C.A. Chiang, Stephanie W. Fowler, Ricky R. Savjani, Susan G. Hilsenbeck, Clare E. Wallace, John R. Cirrito, Pritam Das, Joanna L. Jankowsky . Journal of Experimental Medicine, Volume 215, Issue 5, 1 May 2018, Pages 1349-1364 Read More

Abstract

Drug development for Alzheimer’s disease has endeavored to lower amyloid ß (Aß) by either blocking production or promoting clearance. The benefit of combining these approaches has been examined in mouse models and shown to improve pathological measures of disease over single treatment; however, the impact on cellular and cognitive functions affected by Aß has not been tested. We used a controllable APP transgenic mouse model to test whether combining genetic suppression of Aß production with passive anti-Aß immunization improved functional outcomes over either treatment alone. Compared with behavior before treatment, arresting further Aß production (but not passive immunization) was sufficient to stop further decline in spatial learning, working memory, and associative memory, whereas combination treatment reversed each of these impairments. Cognitive improvement coincided with resolution of neuritic dystrophy, restoration of synaptic density surrounding deposits, and reduction of hyperactive mammalian target of rapamycin signaling. Computational modeling corroborated by in vivo microdialysis pointed to the reduction of soluble/exchangeable Aß as the primary driver of cognitive recovery. © 2018 Chiang et al.

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Posted on May 25, 2018
Posted in: HPAN, Neurodegeneration, Publications Authors: