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(Received for publication, November 18, 1996, and in revised form, January 30, 1997)
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,
,
From the It has been previously demonstrated that growth
hormone (GH)-stimulated tyrosine phosphorylation of Jak2 and Stat5a and
Stat5b occurs in FDP-C1 cells expressing either the entire GH receptor or truncations of the cytoplasmic domain expressing only the
membrane-proximal 80 amino acids. However, other receptor domains that
might modulate rates of GH activation and inactivation of this cascade
have not been examined. Here we have defined a region in the human GH
receptor between amino acids 520 and 540 in the cytoplasmic domain that is required for attenuation of GH-activated Jak/Stat signaling. Immunoprecipitations with antibodies to Jak2 indicate that the protein
tyrosine phosphatase SHP-1 is associated with this kinase in cells
exposed to GH. To address the possibility that SHP-1 could function as
a negative regulator of GH signaling, liver extracts from motheaten
mice deficient in SHP-1 or unaffected littermates were analyzed for
activation of Stats and Jak2. Extracts from motheaten mice displayed
prolonged activation of the Stat proteins as measured by their ability
to interact with DNA and prolonged tyrosine phosphorylation of Jak2.
These results delineate a novel domain in the GH receptor that
regulates the inactivation of the Jak/Stat pathway and appears to be
modulated by SHP-1.
Division of Cytokine Biology, Center for
Biologics Evaluation and Research, Bethesda, Maryland 20892 and the
§ Department of Molecular Biology, Genentech, Inc.,
South San Francisco, California 94080
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