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Kerler, F. ; Ziegler, I. ; Schmid, C. ; Bacher, A.

Synthesis of tetrahydrobiopterin in Friend erythroleukemia cells and its modulator effect on cell proliferation.

Exp. Cell Res. 189, 151-156 (1990)

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Open Access Green as soon as Postprint is submitted to ZB.

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The induction of the enzymes in the tetrahydrobiopterin pathway by dimethyl sulfoxide (DMSO) was investigated in subclones F4N and B8/3 of the proerythroblastoid Friend erythroleukemia cell line (MEL). GTP-cyclohydrolase, the initial enzyme in the biosynthetic pathway, is virtually absent in both clones, but expression increases during 3 days of DMSO treatment. The final enzyme levels show 12-fold (subclone B8/3) and 40-fold (subclone F4N) increases compared to initial values. Enhancement of 6-pyruvoyl tetrahydropterin synthase activity is detectable 6 h after exposure to DMSO and continues to increase in the 3-day time period to 2.4-fold and 1.8-fold levels in subclones B8/3 and F4N, respectively. Sepiapterin reductase is present in unstimulated F4N cells and absent in B8/3 cells. The enzyme activity is not affected by DMSO treatment in either cell line. This explains why DMSO treatment causes accumulation of tetrahydrobiopterin in the MEL subclone F4N, but not in subclone B8/3. MEL cells are devoid of phenylalanine hydroxylase for which tetrahydrobiopterin serves as cofactor. In F4N, but not in B8/3, tetrahydrobiopterin modulates the rate of [³H]-thymidine incorporation, thus being functionally linked with cell proliferation rather than with differentiation. In contrast to T lymphocytes, periods of tetrahydrobiopterin synthesis and of modulator function are uncoupled in MEL cells.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

ISSN (print) / ISBN 1090-2422

e-ISSN 0014-4827

Journal Experimental Cell Research

Quellenangaben Volume: 189, Issue: 2, Pages: 151-156

Publisher Academic Press

Publishing Place Orlando, Fla.

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Clinical Molecular Biology and Tumor Genetics (K.MOLBI)