Kynurenine 3-Hydroxylase in Brain

Species Activity Differences and Effect of Gerbil Cerebral Ischemia

Kuniaki Saito, Bonnie J. Quearry, Misato Saito, Thaddeus Nowak, Sanford P. Markey, Melvyn P. Heyes

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We have developed a rapid and highly sensitive assay for brain kynurenine 3-hydroxylase activity. The present study determined some characteristics and species differences of kynurenine 3-hydroxylase activity in brain and evaluated the response of this enzyme to cerebral ischemia. The kynurenine 3-hydroxylase assay is based on the conversion of L-kynurenine to 3-hydroxykynurenine in vitro and the quantification of 3-hydroxykynurenine by high-performance liquid chromatography. Kynurenine 3-hydroxylase activity was detected in human, macaque, rat, mouse, and gerbil brain. Regional gerbil brain activities ranged from 20 to 50 nmol/g/h, while kynurenine 3-hydroxylase activities in other species were one order of magnitude lower. Kynurenine 3-hydroxylase was also detected in lung, kidney, spleen, intestine, and liver of gerbils, with activities larger than in brain. Delayed increases in the activity of kynurenine 3-hydroxylase occur in several brain regions following transient ischemia in gerbils. These changes are particularly marked in regions that showed the most extensive brain damage (hippocampus and striatum). Kynurenine 3-hydroxylase may have an important role in determining the flux of kynurenine in brain.

Original languageEnglish (US)
Pages (from-to)104-109
Number of pages6
JournalArchives of Biochemistry and Biophysics
Volume307
Issue number1
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

Fingerprint

Kynurenine 3-Monooxygenase
Gerbillinae
Brain Ischemia
Brain
Kynurenine
Assays
High performance liquid chromatography
Macaca
Liver
Intestines
Rats
Hippocampus
Spleen
Ischemia
High Pressure Liquid Chromatography
Fluxes

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology

Cite this

Kynurenine 3-Hydroxylase in Brain : Species Activity Differences and Effect of Gerbil Cerebral Ischemia. / Saito, Kuniaki; Quearry, Bonnie J.; Saito, Misato; Nowak, Thaddeus; Markey, Sanford P.; Heyes, Melvyn P.

In: Archives of Biochemistry and Biophysics, Vol. 307, No. 1, 01.01.1993, p. 104-109.

Research output: Contribution to journalArticle

Saito, Kuniaki ; Quearry, Bonnie J. ; Saito, Misato ; Nowak, Thaddeus ; Markey, Sanford P. ; Heyes, Melvyn P. / Kynurenine 3-Hydroxylase in Brain : Species Activity Differences and Effect of Gerbil Cerebral Ischemia. In: Archives of Biochemistry and Biophysics. 1993 ; Vol. 307, No. 1. pp. 104-109.
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