Tyrosine hydroxylase assay for detection of low levels of enzyme activity in peripheral tissues

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• 作者：Hooper ; Douglas ; Kawamura ; Minoru ; Hoffman ; Beth ; Kopin ; Irwin J. ; Hunyady ; Bela ; Mezey ; Eva ; et. al.
• 关键词：Tyrosine hydroxylase ; Enzymes ; DOPA
• 刊名：Journal of Chromatography B: Biomedical Sciences and Applications
• 出版年：1997
• 出版时间：July 4, 1997
• 年：1997
• 卷：694
• 期：2
• 页码：317-324
• 全文大小：588 K

文摘

A nonisotopic assay for tyrosine hydroxylase, with optimized signal-to-noise ratios, enables determination of low levels of enzyme activity in peripheral tissues. DOPA produced by the enzyme is measured using HPLC with electrochemical detection. Increased signal-to-noise ratios are obtained by including in the reaction mixture glycerol for reduction of blank values and dihydropteridine reductase and NADPH for regeneration of the tetrahydropteridine cofactor. With this method, tyrosine hydroxylase activity can be detected in as few as 200 PC12 cells and in peripheral tissues at levels as low as 4.5 fmol/min/mg wet weight. The assay permits activity to be assessed in a variety of peripheral tissues.