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Alpha- and beta-adrenergic receptor function in the brain during senescence.
1Geriatric Research, Education and Clinical Center, Sepulveda VA Medical Center, CA 91343.
Neurobiology of Aging
|January 1, 1988
Summary
Aging brain neurotransmission involves adrenergic receptors. Studies show decreased beta-adrenergic receptors and impaired alpha-adrenergic receptor synthesis with age, impacting mood and memory.
Area of Science:
- Neuroscience
- Neurochemistry
- Aging Research
Background:
- Adrenergic receptors (alpha and beta) and their second messengers are crucial for brain neurotransmission.
- Age-related alterations in these receptors may underlie changes in arousal, mood, and memory.
Purpose of the Study:
- To investigate the impact of aging on alpha- and beta-adrenergic receptor function in the brain.
- To explore the mechanisms contributing to age-related changes in adrenergic receptor concentrations.
Main Methods:
- Review of existing data on adrenergic receptor changes with age.
- Analysis of factors influencing receptor concentration modulation, including hormonal effects.
Main Results:
- Predominant decrease in beta-adrenergic receptors across most brain regions, excluding the cortex.
- Evidence suggests reduced receptor synthesis contributes to age-related receptor loss.
- Diminished alpha-adrenergic receptor synthesis observed with aging.
- Impaired hormonal modulation of receptor concentrations and delayed recovery from down-regulation in aged individuals.
Conclusions:
- Aging significantly alters adrenergic receptor systems in the brain.
- Decreased receptor synthesis and impaired hormonal regulation are key factors in age-related adrenergic receptor changes.
- These neurochemical shifts likely contribute to cognitive and mood alterations associated with aging.