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J. Biol. Chem., Vol. 265, Issue 6, 3189-3192, Feb, 1990
ER Werner, G Werner-Felmayer, D Fuchs, A Hausen, G Reibnegger, JJ Yim, W Pfleiderer and H Wachter
Institute for Medical Chemistry and Biochemistry, University of Innsbruck, Austria.
Interferon-gamma induces tetrahydrobiopterin biosynthesis in human cells and cell lines. Macrophages are peculiar in the formation of large amounts of neopterin derivatives as compared to tetrahydrobiopterin (Werner, E. R., Werner-Felmayer, G., Fuchs, D., Hausen, A., Reibnegger, G., and Wachter, H. (1989) Biochem J. 262, 861- 866). Here we compare the impact of interferon-gamma treatment on activities of GTP-cyclohydrolase I (EC 3.5.4.16), 6-pyruvoyl tetrahydropterin synthase, and sepiapterin reductase (EC 1.1.1.153) in human peripheral blood-derived macrophages, normal dermal fibroblasts, THP-1 myelomonocytic cells, and the T 24 bladder transitional-cell carcinoma line. Upon interferon-gamma treatment, GTP-cyclohydrolase I activity is increased 7- to 40-fold, whereas 6-pyruvoyl tetrahydropterin synthase and sepiapterin reductase activities, which are constitutively present in all four investigated cells, remain unchanged. In fibroblasts and T 24 cells GTP cyclohydrolase I activity is the rate-limiting step of tetrahydrobiopterin biosynthesis. In macrophages and in THP-1 cells, however, the induced GTP cyclohydrolase I activity is higher than the 6-pyruvoyl tetrahydropterin synthase activity, leading to the accumulation of neopterin and neopterin phosphates.
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