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Catechol-O-methyl transferase activity in human mononuclear cells

J M Bidart, M Assicot, C Bohuon

Research Communications in Chemical Pathology and Pharmacology

|October 1, 1981

Summary

Catechol-O-methyl transferase (COMT) activity was found in human cell membranes. This enzyme

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Area of Science:

Biochemistry
Cell Biology
Pharmacology

Background:

Catechol-O-methyl transferase (COMT) is an enzyme involved in neurotransmitter metabolism.
Understanding COMT activity in human cells is crucial for various physiological and pharmacological studies.

Purpose of the Study:

To investigate the presence and characteristics of COMT activity in human peripheral mononuclear cells and lymphoblastoid cell lines.
To determine kinetic parameters and identify inhibitors of COMT in these cellular models.

Main Methods:

Enzyme activity assays were performed on membrane fractions of human peripheral mononuclear cells and lymphoblastoid cell lines.
Kinetic analysis was conducted to determine the Michaelis constant (Km).
Inhibition studies were carried out using tropolone and by manipulating magnesium ion concentration.

Main Results:

COMT enzymatic activity was detected in the membrane fraction of both cell types.
The Michaelis constant (Km) for COMT was determined to be in the range of 4-9 x 10(-6) M.
COMT activity was inhibited by tropolone and the absence of magnesium ions.

Conclusions:

COMT is enzymatically active in the membrane fraction of human peripheral mononuclear cells and lymphoblastoid cells.
The kinetic properties and inhibition patterns suggest specific characteristics of COMT in these cells.
The study discusses the potential association of COMT with the adrenergic receptor-adenylate cyclase system in mononuclear cells.

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