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A rapid and sensitive assay for monoamine oxidase activity
Acta Physiologica Et Pharmacologica Bulgarica
|January 1, 1978
Summary
A new, rapid method for determining monoamine oxidase (MAO) activity using tyramine was developed. This sensitive assay simplifies ammonia measurement, offering advantages over existing techniques for enzyme research.
Area of Science:
- Biochemistry
- Enzymology
- Analytical Chemistry
Background:
- Monoamine oxidase (MAO) plays a crucial role in neurotransmitter metabolism.
- Accurate and efficient determination of MAO activity is essential for research and diagnostics.
- Existing methods for MAO determination can be complex and time-consuming.
Purpose of the Study:
- To develop a novel, sensitive, and rapid assay for monoamine oxidase (MAO) determination.
- To simplify the procedure by omitting oxygen saturation and ammonia separation steps.
- To provide a versatile method for studying enzyme kinetics and inhibitor effects.
Main Methods:
- Utilized the Berthelot reaction for ammonia quantification.
- Employed tyramine as the substrate for MAO activity.
- Deproteinized samples with ethanol followed by centrifugation.
- Converted newly-formed ammonia to indophenol and measured spectrophotometrically at 625 nm.
- Expressed enzyme activity as ammonia formed per milligram of protein per minute.
Main Results:
- The developed method demonstrated sensitivity and rapidity.
- Established relationships between enzyme activity, incubation time, and protein concentration.
- Investigated the effect of pargyline, a known MAO inhibitor.
- Studied the kinetics of MAO using both liver and brain mitochondria.
Conclusions:
- The new Berthelot-based method offers a sensitive, rapid, and simple approach for MAO determination.
- It provides advantages in specificity, versatility, and performance compared to existing methods.
- This assay is suitable for kinetic studies and evaluating enzyme activity in biological samples.