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Related Experiment Videos

Alcohol-membrane interaction in the brain: norepinephrine release.

A Y Sun

    Research Communications in Chemical Pathology and Pharmacology
    |December 1, 1976
    PubMed
    Summary
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    This study investigated how ethanol affects norepinephrine release in mouse brain synaptosomes. Ethanol exhibits a biphasic effect, altering norepinephrine release potentially through cation transport systems.

    Area of Science:

    • Neuroscience
    • Neuropharmacology
    • Biochemistry

    Background:

    • Norepinephrine (NE) is a crucial neurotransmitter involved in various brain functions.
    • Synaptosomes are isolated nerve endings used to study neurotransmitter release mechanisms.
    • Understanding factors influencing NE release is vital for neuroscience research.

    Purpose of the Study:

    • To investigate the effect of ethanol on the release of 3H-norepinephrine (3H-NE) from mouse brain synaptosomes.
    • To explore the potential mechanisms underlying ethanol's influence on NE release, particularly involving cation transport.

    Main Methods:

    • Mouse brain nerve endings were loaded with 3H-NE via intraventricular injection.
    • Synaptosomal particles were isolated for neurotransmitter release studies.

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  • NE release was stimulated by potassium (K+) and calcium (Ca++) and antagonized by sodium (Na+).

    • Main Results:

    • Acetylcholine at low concentrations inhibited 3H-NE release.
    • Ethanol demonstrated a biphasic effect: low concentrations (0.1-0.5%) decreased NE release, while higher concentrations (1-4%) increased it.
    • The observed biphasic response suggests ethanol may affect active cation transport systems, such as Ca++ transport.

    Conclusions:

    • Ethanol exerts a concentration-dependent, biphasic influence on norepinephrine release from mouse brain synaptosomes.
    • This effect is likely mediated by ethanol's interaction with cation transport mechanisms, particularly calcium transport.
    • Further research into ethanol's neuropharmacological effects is warranted.