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STAT5b Is Required for GH-Induced Liver Igf-I Gene Expression

AgResearch (H.W.D., T.X., M.J.M.), Ruakura Research Centre, Hamilton 2001, New Zealand; Department of Biology (T.X., R.J.W.), University of Waikato, Hamilton 2001, New Zealand; Division of Cell and Molecular Biology (D.J.W.), Department of Biology, Boston University, Boston, Massachusetts 02215; and Department of Anatomy and Structural Biology (D.R.G.), School of Medical Sciences, University of Otago, Dunedin 6001, New Zealand

Address all correspondence and requests for reprints to: Helen W. Davey, AgResearch, Ruakura Research Center, East Street Private Bag 3123, Hamilton, New Zealand. E-mail: helen.davey{at}agresearch.co.nz

Although the increased expression of Igf-I in liver in response to GH is well characterized, the intracellular signaling pathways that mediate this effect have not been identified. Intracellular signaling molecules belonging to the Janus kinase-signal transducer and activator of transcription 5b (JAK2-STAT5b) pathway are activated by GH and have previously been shown to be required for sexually dimorphic body growth and the expression of liver cytochrome P450 proteins known to be regulated by the gender-specific temporal patterns of pituitary GH secretion. Here, we evaluate the role of STAT5b in GH activation of Igf-I by monitoring the induction of Igf-I mRNA in livers of wild-type and Stat5b^-/-mice stimulated with exogenous pulses of GH. GH induced the expression of liver Igf-I mRNA in hypophysectomized male wild-type, but not in hypophysectomized male Stat5b^-/- mice, although theStat5b^-/- mice exhibit both normal liver GH receptor expression and strong GH induction of Cytokine-inducible SH2 protein (Cis), which is believed to contribute to the down-regulation of GH-induced liver STAT5b signaling. Thus, STAT5b plays an important and specific role in liver Igf-I gene expression.

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