Anni, DanielaDanielaAnniWeiss, Eva-MariaEva-MariaWeiss0009-0009-1229-8557Guhathakurta, DebarpanDebarpanGuhathakurtaAkdas, Yagiz EnesYagiz EnesAkdasKlueva, JuliaJuliaKluevaZeitler, StefanieStefanieZeitlerAndres-Alonso, MariaMariaAndres-AlonsoHuth, TobiasTobiasHuthFejtova, AnnaAnnaFejtova2025-10-222025-10-2220211420-9071https://fis.uni-bamberg.de/handle/uniba/110914Amyloid beta (Aβ) is linked to the pathology of Alzheimer’s disease (AD). At physiological concentrations, Aβ was proposed to enhance neuroplasticity and memory formation by increasing the neurotransmitter release from presynapse. However, the exact mechanisms underlying this presynaptic efect as well as specifc contribution of endogenously occurring Aβ isoforms remain unclear. Here, we demonstrate that Aβ1-42 and Aβ1-16, but not Aβ17-42, increased size of the recycling pool of synaptic vesicles (SV). This presynaptic efect was driven by enhancement of endogenous cholinergic signalling via α7 nicotinic acetylcholine receptors, which led to activation of calcineurin, dephosphorylation of synapsin 1 and consequently resulted in reorganization of functional pools of SV increasing their availability for sustained neurotransmission. Our results identify synapsin 1 as a molecular target of Aβ and reveal an efect of physiological concentrations of Aβ on cholinergic modulation of glutamatergic neurotransmission. These fndings provide new mechanistic insights in cholinergic dysfunction observed in AD.engAmyloid betaAlpha7 nicotinic acetylcholine receptorSynaptic vesicle dynamicsSynapsin 1article10.1007/s00018-021-03835-5