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Do glucocorticoids contribute to brain aging?

N R Nichols1, M Zieba, N Bye

  • 1Department of Physiology, Monash University, PO Box 13F, 3800, Victoria, Australia. nancy.nichols@med.monash.edu.au

Brain Research. Brain Research Reviews
|December 18, 2001
PubMed
Summary
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Glucocorticoids impact brain aging, particularly synaptic loss in the hippocampus. Their effects vary with context, and some age-related changes in the aging brain may be reversible.

Area of Science:

  • Neuroscience
  • Aging Research
  • Endocrinology

Background:

  • The hippocampus is crucial for memory and susceptible to aging effects.
  • Glucocorticoids, stress hormones, interact with the aging brain, particularly the hippocampus.
  • Synaptic loss, not neuronal loss, is a key feature of brain aging.

Purpose of the Study:

  • To explore the multifaceted roles of glucocorticoids in brain aging.
  • To investigate how glucocorticoids influence synaptic plasticity and neurogenesis in the aging hippocampus.
  • To understand the contextual dependency of glucocorticoid effects on the aging brain.

Main Methods:

  • Review of recent studies on glucocorticoid effects in the aging brain.
  • Analysis of structural and functional changes in the hippocampus during aging.

Related Experiment Videos

  • Examination of the hypothalamic-pituitary-adrenal axis regulation and glucocorticoid receptor sensitivity.

    • Main Results:

    • High glucocorticoid levels correlate with hippocampal synaptic loss, atrophy, and cognitive decline.
    • Age-related changes can alter sensitivity to glucocorticoids, affecting hypothalamic-pituitary-adrenal axis feedback.
    • Decreased glucocorticoid receptor responsiveness and altered neurogenesis regulation contribute to brain aging.
    • Glucocorticoid effects on neurogenesis and apoptosis in the dentate gyrus are context-dependent.

    Conclusions:

    • Glucocorticoid contribution to brain aging is complex and context-specific.
    • Synaptic loss and cognitive decline are linked to glucocorticoid signaling in aging.
    • Some age-related effects of glucocorticoids on the brain may be reversible.