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Related Experiment Videos

Brain histamine turnover enhanced by footshock.

I Yoshitomi, Y Itoh, R Oishi

    Brain Research
    |January 1, 1986
    PubMed
    Summary

    Footshock stress significantly elevates tele-methyl-histamine (t-MH) levels in the brain, indicating increased histamine (HA) turnover. This effect is modulated by specific enzyme inhibitors, suggesting a complex regulatory mechanism.

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    Area of Science:

    • Neuroscience
    • Pharmacology
    • Biochemistry

    Background:

    • Histamine (HA) is a neurotransmitter involved in various brain functions.
    • Tele-methyl-histamine (t-MH) is a primary metabolite of histamine in the brain.
    • Stress can influence neurotransmitter systems, including the histaminergic system.

    Purpose of the Study:

    • To investigate the effect of acute footshock stress on brain histamine turnover.
    • To explore the role of specific enzymes in mediating stress-induced changes in histamine metabolism.

    Main Methods:

    • Mice were subjected to footshock stress at 15-s intervals for 30-120 minutes.
    • Brain levels of tele-methyl-histamine (t-MH) were measured.
    • Mice were pretreated with pargyline or metoprine.
    • Histamine (HA) depletion was assessed after pretreatment with a-fluoromethylhistidine.

    Main Results:

    • Footshock significantly increased brain t-MH levels.
    • Pretreatment with pargyline did not block the footshock-induced elevation of t-MH.
    • Pretreatment with metoprine blocked the footshock-induced elevation of t-MH.
    • Footshock enhanced histamine (HA) depletion induced by a-fluoromethylhistidine.

    Conclusions:

    • Footshock stress increases brain histamine turnover.
    • The results suggest that MAO B may be involved in the regulation of histamine metabolism during stress.
    • These findings contribute to understanding the neurochemical underpinnings of stress responses.

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