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Young DAPK1 knockout mice have altered presynaptic function.

Dayton J Goodell1,2, Jonathan E Tullis1, K Ulrich Bayer1,2

  • 1Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, Colorado.

Journal of Neurophysiology
|April 21, 2021
PubMed
Summary
This summary is machine-generated.

Death-associated protein kinase 1 (DAPK1) knockout mice show reduced glutamate release, which compensates for impaired long-term depression (LTD). This compensatory mechanism maintains synaptic plasticity despite DAPK1 absence.

Keywords:
DAPK1LTDglutamate release

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Molecular Biology

Background:

  • Death-associated protein kinase 1 (DAPK1) is implicated in long-term depression (LTD) at hippocampal CA1 synapses.
  • DAPK1 regulates LTD by suppressing postsynaptic Ca2+/calmodulin-dependent protein kinase II binding to GluN2B subunit of NMDA receptors.

Purpose of the Study:

  • To investigate the role of DAPK1 in LTD using genetic deletion.
  • To identify compensatory mechanisms in DAPK1 knockout mice.

Main Methods:

  • Utilized DAPK1 knockout (DAPK1-/-) mice.
  • Performed paired pulse facilitation experiments.
  • Assessed basal synaptic strength and glutamate release probability.

Main Results:

  • Genetic deletion of DAPK1 did not reduce LTD in young mice.
  • LTD stimuli decreased presynaptic release probability in DAPK1-/- mice, indicating a compensatory mechanism.
  • Young DAPK1-/- mice exhibited reduced basal glutamate release probability, which normalized with maturation.

Conclusions:

  • Presynaptic compensation, specifically reduced release probability, occurs in DAPK1 knockout mice.
  • This compensatory mechanism may explain the lack of LTD reduction in young DAPK1-/- mice.
  • DAPK1 influences basal glutamate release, with effects normalizing over time.