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Am J Physiol Cell Physiol 276: C1014-C1024, 1999;
0363-6143/99 $5.00
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Vol. 276, Issue 5, C1014-C1024, May 1999

Thyroid hormone induces activation of mitogen-activated protein kinase in cultured cells

Hung-Yun Lin1,2, Faith B. Davis1,2, Jennifer K. Gordinier1,2, Leon J. Martino1, and Paul J. Davis1,2

1 Division of Molecular and Cellular Medicine, Department of Medicine, Albany Medical College and 2 Veterans Affairs Healthcare Network Upstate New York, Albany, New York 12208

Thyroid hormone [L-thyroxine (T4)] rapidly induced phosphorylation and nuclear translocation (activation) of mitogen-activated protein kinase (MAPK) in HeLa and CV-1 cells in the absence of cytokine or growth factor. A pertussis toxin-sensitive and guanosine 5'-O-(3-thiotriphosphate)-sensitive cell surface mechanism responsive to T4 and agarose-T4, suggesting a G protein-coupled receptor, was implicated. Cells depleted of MAPK or treated with MAPK pathway inhibitors showed reduced activation of MAPK and of the signal transducer and activator of transcription STAT1alpha by T4; they also showed reduced T4 potentiation of the antiviral action of interferon-gamma (IFN-gamma ). T4 treatment caused tyrosine-phosphorylated MAPK-STAT1alpha nuclear complex formation and enhanced Ser-727 phosphorylation of STAT1alpha , in the presence or absence of IFN-gamma . STAT1alpha -deficient cells transfected with STAT1alpha containing an alanine-for-serine substitution at residue 727 (STAT1alpha A727) showed minimal T4-stimulated STAT1alpha activation. IFN-gamma induced the antiviral state in cells containing wild-type STAT1alpha (STAT1alpha wt) or STAT1alpha A727; T4 potentiated IFN-gamma action in STAT1alpha wt cells but not in STAT1alpha A727 cells. T4-directed STAT1alpha Ser-727 phosphorylation is MAPK mediated and results in potentiated STAT1alpha activation and enhanced IFN-gamma activity.

thyroxine; signal transducer and activator of transcription 1alpha ; signal transduction


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