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Identification of Genes Induced by Growth Hormone in Rat Liver Using cDNA Arrays

Address all correspondence and requests for reprints to: Michael J. Waters, Ph.D., University of Queensland, Department of Physiology and Pharmacology, St. Lucien, Brisbane 4072, Australia.

	Abstract

Top Abstract

 
Growth hormone (GH) is a pleiotropic cytokine that acts upon its target cells to regulate their growth, differentiation and metabolism. GH is thought to act by altering gene expression in target cells, but few GH-regulated genes are known. In this study, we used cDNA array analysis to identify genes rapidly induced in the liver of GH-deficient dwarf rats following a single systemic injection of GH. Eight genes were found to upregulate their mRNA expression within 1–3 hours of GH administration, results which were confirmed by northern analysis. The identity of these genes suggests GH may influence a diversity of cellular processes. A role for GH in regulating cytokine and growth factor signalling is suggested by upregulation of mRNAs encoding three signal transducers: a subunit of the receptor for IL-6-type cytokines (gp130), STAT3 (signal transducer and activator of transcription) and p38MAPK (mitogen activated protein kinase). Two genes involved in DNA repair and cell cycle control, APEN (apurinic endonuclease) and GADD45 (growth arrest and DNA damage 45) were upregulated. Other induced genes include those encoding a lactate transporter (MCT-1), an extracellular matrix remodeling enzyme, MT1-MMP (membrane type 1 matrix metalloproteinase) and an acute phase protein (fibrinogen beta). In summary, this work is the first to apply cDNA arrays to the study of peptide hormone action in vivo and has identified 8 novel GH target genes.

Received July 3, 2000.

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