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• W1978094754 endingPage "19773" @default.
• W1978094754 startingPage "19768" @default.
• W1978094754 abstract "Members of the cytokine/growth hormone (GH)/prolactin receptor superfamily transduce signals by association and activation of JAK tyrosine kinases. For GH receptor (GHR), both JAK2 and the GHR undergo tyrosine phosphorylation upon GH stimulation. Also, GH has recently been shown to activate the transcription factor STAT5 by tyrosine phosphorylation. In the present study, we demonstrate that GH induces rapid tyrosine phosphorylation of different isoforms of STAT5 in mouse L cells stably transfected with a cDNA encoding porcine GHR (pGHR). In this cell system, STAT5 directly interacts with the GHR in a GH-dependent manner. Additionally, GH-induced tyrosine phosphorylation of STAT5 and the interaction of STAT5 with GHR can be observed in mouse 3T3-F442A cells which express endogenous mouse GHR. Interestingly, when cDNAs encoding the two mouse STAT5 homologs (STAT5A and STAT5B) were individually transfected into mouse L cells expressing pGHR, only STAT5A demonstrated the ability to interact with the pGHR and subsequently underwent GH-dependent tyrosine phosphorylation. STAT5B did not. Therefore, the GH-dependent interaction of a particular STAT5 with tyrosine-phosphorylated GHR may play an important role in GH-mediated signal transduction. Members of the cytokine/growth hormone (GH)/prolactin receptor superfamily transduce signals by association and activation of JAK tyrosine kinases. For GH receptor (GHR), both JAK2 and the GHR undergo tyrosine phosphorylation upon GH stimulation. Also, GH has recently been shown to activate the transcription factor STAT5 by tyrosine phosphorylation. In the present study, we demonstrate that GH induces rapid tyrosine phosphorylation of different isoforms of STAT5 in mouse L cells stably transfected with a cDNA encoding porcine GHR (pGHR). In this cell system, STAT5 directly interacts with the GHR in a GH-dependent manner. Additionally, GH-induced tyrosine phosphorylation of STAT5 and the interaction of STAT5 with GHR can be observed in mouse 3T3-F442A cells which express endogenous mouse GHR. Interestingly, when cDNAs encoding the two mouse STAT5 homologs (STAT5A and STAT5B) were individually transfected into mouse L cells expressing pGHR, only STAT5A demonstrated the ability to interact with the pGHR and subsequently underwent GH-dependent tyrosine phosphorylation. STAT5B did not. Therefore, the GH-dependent interaction of a particular STAT5 with tyrosine-phosphorylated GHR may play an important role in GH-mediated signal transduction." @default.
• W1978094754 created "2016-06-24" @default.
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• W1978094754 date "1996-08-01" @default.
• W1978094754 modified "2023-10-15" @default.
• W1978094754 title "Growth Hormone Promotes the Association of Transcription Factor STAT5 with the Growth Hormone Receptor" @default.
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• W1978094754 doi "https://doi.org/10.1074/jbc.271.33.19768" @default.
• W1978094754 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/8702683" @default.
• W1978094754 hasPublicationYear "1996" @default.
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