TITLE

High-performance liquid chromatography-fluorescent assay of catechol-O-methyltransferase activity in rat brain

AUTHOR(S)
Masuda, Mayumi; Tsunoda, Makoto; Imai, Kazuhiro
PUB. DATE
August 2003
SOURCE
Analytical & Bioanalytical Chemistry;Aug2003, Vol. 376 Issue 7, p1069
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A method to measure catechol-O-methyltransferase (COMT) activity using high performance liquid chromatography—fluorescence detection with norepinephrine (NE) as a natural substrate was optimized for both soluble (S-) and membrane-bound (MB-) COMT activities in rat brain areas, cerebral cortex, cerebellum, hippocampus, brain stem, hypophysis, and hypothalamus. The highest S-COMT activity in Sprague-Dawley rat brain was found in hippocampus. MB-COMT activities in all brain areas were about 3–8 times lower than S-COMT activities. However, considering Vmax/Km values, specificity constants for NE to S- and MB-COMT contributes mainly to the metabolism of NE in cerebral cortex and cerebellum.
ACCESSION #
15124641

 

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