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Age-related changes in brain histamine.

I M Mazurkiewicz-Kwilecki, G D Prell

    Agents and Actions
    |April 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Aging increases brain histamine levels in rats due to reduced histamine methyltransferase (HMT) activity. This suggests age-related changes in histamine regulation, impacting neurotransmitter balance.

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    Area of Science:

    • Neuroscience
    • Aging Research
    • Biochemistry

    Background:

    • Histamine plays a crucial role in central nervous system functions.
    • Age-related changes in neurotransmitter systems are well-documented.
    • The impact of aging on brain histamine and its metabolism is less understood.

    Purpose of the Study:

    • To investigate the effect of aging on histamine levels in rat brain regions.
    • To examine the activity of histamine methyltransferase (HMT) in aging rats.
    • To understand how aging influences histamine regulation in the brain.

    Main Methods:

    • Comparison of histamine concentrations in hypothalamus, midbrain, and cortex of young (3-month-old) and old (12-month-old) male Sprague-Dawley rats.
    • Measurement of histamine methyltransferase (HMT) activity in the same brain regions.

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  • Statistical analysis to determine significant differences between age groups.

    • Main Results:

    • Older rats (12 months) exhibited significantly higher histamine concentrations in the hypothalamus, midbrain, and cortex compared to younger rats (3 months).
    • Histamine methyltransferase (HMT) activity was significantly decreased across all three investigated brain regions in older rats.
    • The observed increase in brain histamine levels in aged rats may be partly due to the reduced HMT activity.

    Conclusions:

    • Aging significantly alters brain histamine levels and histamine methyltransferase (HMT) activity in rats.
    • Decreased HMT activity in aged rats contributes to elevated brain histamine concentrations.
    • These findings suggest that brain histamine regulation is affected during the aging process, similar to other neurotransmitters.