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Related Experiment Videos

Brain aryl acylamidase.

L L Hsu

    The International Journal of Biochemistry
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified two forms of serotonin-sensitive aryl acylamidase (AAA) in the brain. These enzymes, AAA-1 and AAA-2, show distinct regional and subcellular distributions, offering insights into their potential roles in central nervous system function.

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    Area of Science:

    • Neurochemistry
    • Enzymology
    • Central Nervous System (CNS) Research

    Background:

    • The serotonin (5-HT) sensitive brain aryl acylamidase (AAA) is implicated in 5-HT's mechanism of action within the CNS.
    • Understanding AAA's function is crucial for deciphering serotonergic pathways.

    Purpose of the Study:

    • To separate and characterize multiple forms of brain aryl acylamidase.
    • To investigate the regional and subcellular distribution of these enzyme forms in the rat brain.
    • To explore the potential physiological roles and enzymatic properties of brain AAA.

    Main Methods:

    • Separation of AAA forms (AAA-1 and AAA-2) using ammonium sulfate precipitation and gel filtration.
    • Characterization of enzyme activities using various drugs (e.g., d-LSD, 5-HT) and substrates.

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  • Analysis of enzyme distribution across different rat brain regions and subcellular fractions (synaptosomes, mitochondria, microsomes, nuclei).

    • Main Results:

    • Two distinct forms, AAA-1 and AAA-2, were isolated and their properties differentiated.
    • AAA-1 and AAA-2 exhibited specific regional activity patterns in the rat brain (corpus striatum vs. cerebellum).
    • Subcellular localization varied, with AAA-1 prominent in synaptosomes and AAA-2 in microsomes; Triton X-100 altered distribution.

    Conclusions:

    • AAA-1 and AAA-2 possess unique regional and subcellular distributions, suggesting specialized functions.
    • AAA-2's inhibition by neostigmine hints at a possible association with acetylcholinesterase (AChE), requiring further investigation.
    • Further research on natural aromatic alkylamines as substrates is needed to elucidate the physiological roles of brain AAA.