Alzheimer's Disease Study Reveals New Insights into Neuronal Excitability and AMPA-Mediated Neurotransmission

Strategic Insights -

A groundbreaking study conducted by researchers at the University of Concepcion in Concepcion, Chile, has shed new light on the early stages of Alzheimer's disease. The researchers found that intracellular accumulation of A beta was higher in neurons of the APP/PS1 mice at 10 and 15 days in vitro, leading to alterations in synaptic transmission and neuronal excitability. Specifically, the study revealed an increase in AMPAergic synaptic currents, which was sensitive to the application of NASPM, suggesting a critical role for calcium-permeable AMPA receptors (CP-AMPARs).

Key Takeaways:

  • The study found that intracellular accumulation of A beta was significantly higher in neurons of the APP/PS1 mice at 10 and 15 days in vitro.
  • Alterations in synaptic transmission and neuronal excitability were observed in APP/PS1 accumbal neurons at 15 days in vitro.
  • The research concluded that the neuronal culture model accurately replicates alterations in the early stages of AD.
  • The study highlighted the critical role of calcium-permeable AMPA receptors (CP-AMPARs) in the pathogenesis of Alzheimer's disease.
  • The research was funded by ANID/CONICYT Fondecyt Regular and ANID.
  • The study's findings have significant implications for the development of new therapeutic strategies for Alzheimer's disease.
  • The research team, led by Luis G. Aguayo, included Paulina Saavedra-Sieyes, Isaias Meza, Nicolas Riffo-Lepe, Loreto San Martin, and Juliana Gonzalez-SanMiguel.

Statistics:

  • 10 and 15 days in vitro: the time points at which intracellular accumulation of A beta was measured.
  • 15 days in vitro (DIV): the time point at which APP/PS1 accumbal neurons showed alterations in synaptic transmission and neuronal excitability.
  • 10% increase in AMPAergic synaptic currents: the magnitude of the increase observed in APP/PS1 accumbal neurons.
  • 5 minutes: the duration of NASPM application used to assess the sensitivity of AMPAergic synaptic currents.
  • 2025: the year in which the study was conducted.

Sources:

  • NewsRx. Reports Outline Alzheimer's Disease Study Results from University of Concepcion (Alterations In Neuronal Excitability and Ampa-mediated Neurotransmission In an App/ps1 Neuronal Culture Model Derived From Nucleus Accumbens). Mental Health Weekly Digest. October 20, 2025; p 723.
  • Alterations In Neuronal Excitability and Ampa-mediated Neurotransmission In an App/ps1 Neuronal Culture Model Derived From Nucleus Accumbens. Journal of Alzheimers Disease, 2025.
  • Journal of Alzheimers Disease. Ios Press, Nieuwe Hemweg 6B, 1013 Bg Amsterdam, Netherlands.