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Related Experiment Videos

Histidine transport into rat brain synaptosomes.

L R Hegstrand, J R Simon

    Journal of Neurochemistry
    |August 1, 1985
    PubMed
    Summary

    Histidine transport in rat brain synaptosomes does not appear to regulate histamine levels. Despite uptake mechanisms, no new histamine was formed, suggesting histidine transport is not key for neurotransmitter pools.

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    Area of Science:

    • Neuroscience
    • Neurochemistry

    Background:

    • Histamine (HA) is a putative neurotransmitter in the brain.
    • Understanding histidine transport is crucial for elucidating histamine synthesis regulation.

    Purpose of the Study:

    • To investigate histidine transport and metabolism in rat brain synaptosomes.
    • To determine the role of histidine uptake in histamine synthesis and neurotransmitter pool maintenance.

    Main Methods:

    • Studied histidine uptake in rat brain synaptosomes.
    • Utilized kinetic analyses, metabolic inhibitors, and ion dependency studies.
    • Performed lesioning and ontogenic studies.

    Main Results:

    • Histidine uptake is regionally distributed, temperature-sensitive, and ion-dependent.
    • Uptake is inhibited by metabolic inhibitors, promethazine, and quinacrine.
    • No newly formed [3H]histamine was detected after [3H]histidine transport; histidine uptake did not correlate with brain lesions or change significantly postnatally.

    Conclusions:

    • Histidine transport in rat brain synaptosomes does not support a role in regulating or maintaining brain histamine neurotransmitter pools.
    • The findings suggest histidine uptake is not the primary mechanism for histamine synthesis regulation in the rat brain.

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