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Related Experiment Videos

Functional aspects of calcium-channel modulation

J F Disterhoft1, J R Moyer, L T Thompson

  • 1Department of Cell, Molecular, and Structural Biology, Northwestern University Medical School, Chicago, IL 60611-3008.

Clinical Neuropharmacology
|January 1, 1993
PubMed
Summary
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Nimodipine enhances learning in aging animals by improving hippocampal neuron activity and reducing age-related cellular changes. This calcium channel blocker restores normal learning rates and open field behavior in aged subjects.

Area of Science:

  • Neuroscience
  • Neurobiology
  • Calcium Signaling

Background:

  • Associative learning involves brain changes, often calcium-mediated.
  • Hippocampus is crucial for new information storage during learning.
  • Aging impairs learning and is linked to hippocampal neuron dysfunction, including increased after-hyperpolarizations (AHPs) and altered calcium buffering.

Purpose of the Study:

  • To investigate the cellular mechanisms by which nimodipine enhances learning in aging rabbits.
  • To determine how nimodipine affects hippocampal neuronal activity and calcium dynamics in aging brains.

Main Methods:

  • Eyeblink conditioning task in aging and young rabbits, rats, and monkeys.
  • In vivo and in vitro electrophysiological recordings of hippocampal pyramidal neurons.

Related Experiment Videos

  • Administration of nimodipine and other calcium channel blockers.
  • Analysis of neuronal firing rate, after-hyperpolarizations (AHPs), spike frequency adaptation, calcium action potentials, and L-type calcium currents.

    • Main Results:

    • Nimodipine significantly enhanced hippocampal pyramidal neuron firing rate in aging rabbits in an age- and concentration-dependent manner.
    • The slow AHP, larger in aging neurons, was reduced by nimodipine; nimodipine also partially blocked spike frequency adaptation in aging neurons.
    • Nimodipine modulated the calcium action potential in aging neurons and blocked the L-type calcium current in acutely dissociated hippocampal neurons.

    Conclusions:

    • Nimodipine enhances learning in aging animals by improving hippocampal neuronal activity.
    • The drug normalizes age-related cellular changes, including increased AHPs and altered calcium currents.
    • Nimodipine's effects on hippocampal function contribute to reversing age-related learning and behavioral deficits.