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Apolipoprotein E4 (ApoE4) and ApoE3 affect neuronal activity differently based on their source. Astrocytic ApoE4 increases neuronal firing, while neuronal ApoE3 enhances activity in Alzheimer

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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Alzheimer's disease (AD) involves early synaptic changes and neuronal network dysfunction.
  • Apolipoprotein E4 (ApoE4), a major genetic risk factor for AD, is found at synapses and can cause hyperexcitability.
  • ApoE is primarily produced by astrocytes, but neurons can produce it under stress; its synaptic roles and source-dependent effects on excitability are unclear.

Purpose of the Study:

  • To investigate the synaptic localization of human Apolipoprotein E (ApoE) isoforms (ApoE3 and ApoE4).
  • To determine the effects of ApoE isoforms from different cellular sources (astrocytes vs. neurons) on neuronal activity.
  • To compare these effects in control and Alzheimer's disease (AD)-like in vitro neuron models.

Main Methods:

  • Live cell Ca2+ imaging was used to measure neuronal activity.
  • Experiments utilized cultured neuron models, including APP/PS1 AD transgenic and wild-type neurons.
  • Astrocyte-conditioned medium and neuron-expressed ApoE were used to study source-specific effects.

Main Results:

  • ApoE was observed to localize at or near synaptic terminals.
  • Astrocytic ApoE4 increased neuronal activity after acute exposure, while neuronal ApoE3 induced higher firing rates compared to ApoE4.
  • APP/PS1 AD neurons showed increased activity without astrocytic ApoE, and with astrocytic ApoE4 but not ApoE3, compared to wild-type neurons.

Conclusions:

  • ApoE targets synapses and differentially modulates neuronal activity based on its cellular origin (astrocyte or neuron).
  • Astrocytic ApoE4 strongly increases neuronal firing, whereas neuronal ApoE3 is most effective at enhancing neuronal activity.
  • ApoE isoforms exhibit differential effects on neuronal activity in AD transgenic models versus wild-type neurons.