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Related Experiment Videos

Structural changes in the normally aging cerebral cortex of primates.

Alan Peters1

  • 1Department of Anatomy and Neurobiology, Boston University School of Medicine, 715 Albany Street, Boston, MA 02118-2526, USA. apeters@cajal-1.bu.edu

Progress in Brain Research
|July 30, 2002
PubMed
Summary

Cognitive decline in aging primates is not due to neuron loss but may stem from white matter and myelin sheath changes affecting neuronal communication.

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Area of Science:

  • Neuroscience
  • Aging Research
  • Primate Models

Background:

  • Cognitive decline is common in aging humans, but its causes are unclear due to limited brain data.
  • Nonhuman primate models, like rhesus monkeys, offer insights into age-related cognitive changes.
  • Previous research ruled out cortical neuron loss and senile plaques as primary causes of cognitive decline.

Purpose of the Study:

  • To investigate the cellular and structural changes in the aging primate brain associated with cognitive decline.
  • To identify potential mechanisms underlying age-related cognitive impairment in nonhuman primates.

Main Methods:

  • Cognitive testing in rhesus monkeys before brain preservation.
  • Detailed cytological examination of brain tissue, focusing on neurons, glia, white matter, and myelin.

Related Experiment Videos

  • Analysis of synaptic density and glial cell content.

    • Main Results:

    • Cortical neurons, except in layer 1, show minimal aging signs; synaptic loss occurs throughout the cortex.
    • Microglia and astrocytes accumulate phagocytosed material of unknown origin.
    • White matter shows degradation, including myelin sheath breakdown and oligodendrocyte alterations, potentially affecting axonal conduction velocity.

    Conclusions:

    • Age-related cognitive decline in primates is not linked to neuron loss but may be associated with white matter integrity.
    • Myelin alterations and subsequent changes in axonal conduction velocity are suggested as contributors to cognitive decline.
    • Further research is needed to understand the origin of phagocytosed material in glial cells and its role in aging.