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J Biol Chem, Vol. 274, Issue 12, 7793-7802, March 19, 1999
From the Department of Molecular and Cellular Biology, Roswell Park
Cancer Institute, Buffalo, New York 14263 and the
§ Oncology Gene Therapy Program, The Toronto Hospital,
Toronto, Ontario M5G 2M1, Canada
Interleukin (IL)-6 is a major regulator of
hepatic acute-phase plasma protein (APP) genes. The membrane-proximal
133-amino acid cytoplasmic domain of glycoprotein (gp) 130, containing
one copy of the Box3 motif, is sufficient to transmit a productive signal to endogenous APP genes in rat hepatoma H-35 cells. In contrast,
a mutant gp130 domain lacking the Box3 motif activates Janus kinases to
a normal level but fails to activate signal transducer and activator of
transcription 3 and to up-regulate a number of APP genes, including
thiostatin, fibrinogen, hemopexin, and haptoglobin. However, in the
absence of Box3, gp130 still stimulates the expression of
2-macroglobulin and synergizes with IL-1 to
up-regulate
1-acid glycoprotein. The Box3 motif is not
required for activation of the SH2-containing protein tyrosine
phosphatase 2 or the mitogen-activated protein kinase (MAPK), nor is
the immediate induction of egr-1 and junB
significantly altered. Surprisingly, gp130 without any functional Box3
stimulates prolonged activation of MAPK, leading to an extended period
of up-regulation of egr-1 and to an extracellularly regulated kinase-mediated reduction in the IL-6-stimulated production of thiostatin. IL-6 reduces proliferation of H-35 cells through signaling by the Box3. In addition, cells expressing Box3-deficient gp130 showed distinct morphologic changes upon receptor activation. Taken together, these results indicate that Box3-derived and
Box3-independent signals cooperate in the control of hepatic APP genes
and that Box3 may be involved in the modulation of MAPK activity in
gp130 signaling.
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