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Rat brain aryl acylamidase: further characterization of multiple forms
The International Journal of Biochemistry
|January 1, 1982
Summary
Beta-carboline compounds may regulate aryl acylamidase (AAA) activity in rat brains. Different compounds differentially affected AAA-1 and AAA-2, suggesting distinct roles in brain function.
Area of Science:
- Neurochemistry
- Enzymology
Background:
- Aryl acylamidase (AAA) is an enzyme found in rat brain extracts.
- Understanding the regulation of AAA is crucial for comprehending brain function.
Purpose of the Study:
- To investigate the effects of various compounds on two distinct fractions of aryl acylamidase (AAA-1 and AAA-2) from rat brain.
- To explore the potential roles of beta-carboline compounds and other neurochemicals in modulating AAA activity.
Main Methods:
- Separation of AAA fractions using ammonium sulfate precipitation and Bio-Gel chromatography.
- Enzyme inhibition and activation assays using a range of compounds including beta-carbolines, methiothepin, cyproheptadine, chlorimipramine, and neostigmine.
Main Results:
- 1,2,3,4-Tetrahydro-beta-carboline competitively inhibited AAA-1 more than AAA-2.
- Harmalol and several other beta-carbolines showed differential effects, inhibiting or enhancing AAA-1 and AAA-2.
- Methiothepin, cyproheptadine, and chlorimipramine inhibited AAA-1 but stimulated AAA-2.
- Neostigmine moderately inhibited AAA-2 but not AAA-1.
Conclusions:
- Beta-carboline compounds appear to play a regulatory role in the activity of both AAA-1 and AAA-2 in the brain.
- AAA-1 and AAA-2 may be associated with serotonergic neurons, with AAA-2 potentially linked to acetylcholinesterase activity.