Gene regulation by growth hormone.
Since the somatomedin hypothesis of growth hormone (GH) action was first formulated more than 50 years ago, the key roles of both GH and insulin-like growth factor-I (IGF-I) in human growth have been extended to include important effects on tissue maintenance and repair. More recent observations have revealed that this pathway has a negative side, as it has been implicated as a potential contributor to the development of several human cancers and has been linked to diminished lifespan in experimental animals. This brief review focuses on fundamental aspects of gene regulation by GH, as long-term hormonal effects all require changes in gene expression. Topics to be discussed include GH-stimulated signal transduction pathways, mechanisms of gene activation and gene repression by GH, and an analysis of control of IGF-I gene transcription by the GH-stimulated transcription factor, signal transducer and activator of transcription (Stat)5b.
Rotwein
Peter
P
Department of Biochemistry and Molecular Biology, Oregon Health & Science University, Portland, OR 97239-3098, USA. rotweinp@ohsu.edu
Chia
Dennis J
DJ
D000818:Animals; D004195:Disease Models, Animal; D018507:Gene Expression Regulation, Developmental; D013006:Growth Hormone / Q000235:genetics*; D019382:Human Growth Hormone / Q000235:genetics*; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000235:genetics; D051379:Mice; D034622:RNA Interference / Q000502:physiology; D015398:Signal Transduction / Q000502:physiology; D015533:Transcriptional Activation / Q000502:physiology
D019382:Human Growth Hormone; D007334:Insulin-Like Growth Factor I; D013006:Growth Hormone