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Related Experiment Videos

Hippocampal interneurons expressing glutamic acid decarboxylase and calcium-binding proteins decrease with aging in

A K Shetty1, D A Turner

  • 1Department of Surgery (Neurosurgery), Duke University Medical Center, Durham, North Carolina 27710, USA. ashok.shetty@duke.edu

The Journal of Comparative Neurology
|April 29, 1998
PubMed
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Aging significantly reduces hippocampal interneuron numbers, impacting inhibitory circuitry and potentially leading to altered neuronal synchrony and behavioral changes in aged rats.

Area of Science:

  • Neuroscience
  • Aging Research
  • Cell Biology

Background:

  • Aging causes significant changes in hippocampal function and plasticity.
  • Understanding alterations in inhibitory circuitry is crucial for comprehending age-related cognitive decline.
  • Hippocampal interneurons play a vital role in regulating neuronal activity and synchrony.

Purpose of the Study:

  • To quantify age-related changes in hippocampal interneuron populations.
  • To investigate the specific alterations in interneurons expressing glutamic acid decarboxylase (GAD) and calcium-binding proteins (parvalbumin, calbindin, calretinin).
  • To determine the impact of these changes on hippocampal inhibitory circuitry.

Main Methods:

  • Comparative analysis of interneuron populations in young adult (4-5 months) and aged (23-25 months) male Fischer 344 rats.

Related Experiment Videos

  • Immunohistochemical staining for GAD and calcium-binding proteins (parvalbumin, calbindin, calretinin).
  • Quantitative assessment of interneuron numbers across different hippocampal subfields.

    • Main Results:

    • A significant decline in the overall number of hippocampal interneurons was observed with aging.
    • Specific subpopulations of interneurons (GAD+, parvalbumin+, calbindin+, calretinin+) showed significant reductions in various hippocampal subfields.
    • Calbindin-positive interneurons exhibited the most pronounced age-related decrease.
    • The relative ratios of calcium-binding protein-positive interneurons to GAD-positive interneurons remained constant, indicating a genuine loss of these interneurons.

    Conclusions:

    • Aging leads to a substantial loss of hippocampal interneurons, particularly those expressing calcium-binding proteins.
    • This interneuron loss likely impairs hippocampal inhibitory drive, affecting information processing, neuronal synchrony, and excitability control.
    • These findings highlight critical age-related alterations in hippocampal circuitry that may underlie behavioral changes.