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Decrease in calbindin content significantly alters LTP but not NMDA receptor and calcium channel properties.

A Jouvenceau1, B Potier, F Poindessous-Jazat

  • 1Neurobiologie de la Croissance et de la Sénescence, INSERM U 549, IFR Broca-Sainte Anne, 2ter rue d'Alésia, 75014, Paris, France.

Neuropharmacology
|April 17, 2002
PubMed
Summary
This summary is machine-generated.

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Calbindin D(28K) (CaBP) deficiency impairs synaptic plasticity (LTP) by altering calcium handling, not calcium entry. Reduced CaBP leads to excessive cytosolic calcium, hindering long-term potentiation.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Synaptic plasticity, crucial for learning and memory, is modulated by intracellular calcium dynamics.
  • Calbindin D(28K) (CaBP) is a cytosolic calcium-binding protein implicated in regulating calcium levels within neurons.

Purpose of the Study:

  • To investigate the role of CaBP in hippocampal long-term potentiation (LTP) in a mouse model.
  • To determine if CaBP deficiency affects NMDA receptor or calcium channel function.

Main Methods:

  • Electrophysiological recordings of LTP in hippocampal CA1 area of wild-type and CaBP-deficient mice.
  • Assessment of NMDA receptor biophysical properties and calcium channel function.
  • Pharmacological manipulation using glycine, D-APV, and BAPTA-AM.

Related Experiment Videos

Main Results:

  • CaBP-deficient mice exhibited impaired LTP induction and maintenance.
  • No significant differences were found in NMDA receptor or calcium channel properties between genotypes.
  • LTP loss in CaBP-deficient mice was partially restored by D-APV and BAPTA-AM, and LTP was induced in wild-type mice with reduced stimulation.
  • Excessive postsynaptic calcium rise, not impaired calcium entry, was linked to LTP impairment.

Conclusions:

  • CaBP is critical for regulating cytosolic calcium levels during synaptic activity.
  • CaBP deficiency impairs LTP by allowing excessive postsynaptic calcium elevation, disrupting plasticity mechanisms.
  • CaBP's role is to shape the spatio-temporal pattern of intracellular calcium, essential for long-term synaptic plasticity.