Growth hormone (GH) exerts profound physiological effects on growth and metabolism, and is implicated in insulin resistance and possibly cancer. Many responses to GH depend on its ability to regulate gene transcription. We hypothesize that GH-regulated transcription is mediated by the ordered assembly of multicomponent nucleoprotein complexes on target genes and that GH-induced modifications of critical proteins can direct them into and out of the complexes. Our approach is to dissect the assembly of the multicomponent complexes in response to GH using chromatin immunoprecipitation (ChIP) and re-ChIP to define GH-regulated components of complexes and determine the dynamics of assembly on the model gene c-fos. In parallel, we will also examine post-translational modifications induced by GH on the transcription factor C/EBPp, which is essential for GH-stimulated transcription of c-fos. The sequence of complex assembly will be related to the timing and combinations of post-translational modifications of C/EBPp including phosphorylation, acetylation and sumoylation. When regulation of complexes by GH is determined, we will validate their functional importance for GH-regulated gene expression in vivo. Relevance: GH is used for treatment of short stature in GH deficiency. The anabolic properties of GH are being used therapeutically to improve wound healing and to reverse wasting in HIV patients. However, GH is also diabetogenic and reduces sensitivity to insulin. Recently, the GH-IGF axis has been implicated in cancer, broadening our need to understand the basis of GH action. The proposed studies will provide fundamental information about how GH alters cell function by regulating genes. With this information, we can identify new molecular targets to develop more effective therapies for conditions responsive to GH and to avoid GH-related complications in conditions such as diabetes and cancer. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK046072-10
Application #
7217974
Study Section
Molecular and Cellular Endocrinology Study Section (MCE)
Program Officer
Blondel, Olivier
Project Start
1996-09-30
Project End
2010-02-28
Budget Start
2007-03-01
Budget End
2008-02-29
Support Year
10
Fiscal Year
2007
Total Cost
$289,463
Indirect Cost
Name
University of Michigan Ann Arbor
Department
Physiology
Type
Schools of Medicine
DUNS #
073133571
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109
Carter-Su, Christin; Schwartz, Jessica; Argetsinger, Lawrence S (2016) Growth hormone signaling pathways. Growth Horm IGF Res 28:11-5
LaPensee, Christopher R; Lin, Grace; Dent, Alexander L et al. (2014) Deficiency of the transcriptional repressor B cell lymphoma 6 (Bcl6) is accompanied by dysregulated lipid metabolism. PLoS One 9:e97090
Lin, Grace; LaPensee, Christopher R; Qin, Zhaohui S et al. (2014) Reciprocal occupancy of BCL6 and STAT5 on Growth Hormone target genes: contrasting transcriptional outcomes and promoter-specific roles of p300 and HDAC3. Mol Cell Endocrinol 395:19-31
Cui, Tracy X; Lin, Grace; LaPensee, Christopher R et al. (2011) C/EBP? mediates growth hormone-regulated expression of multiple target genes. Mol Endocrinol 25:681-93
Chen, Yili; Lin, Grace; Huo, Jeffrey S et al. (2009) Computational and functional analysis of growth hormone (GH)-regulated genes identifies the transcriptional repressor B-cell lymphoma 6 (Bc16) as a participant in GH-regulated transcription. Endocrinology 150:3645-54
Cesena, Teresa I; Cui, Tracy X; Subramanian, Lalitha et al. (2008) Acetylation and deacetylation regulate CCAAT/enhancer binding protein beta at K39 in mediating gene transcription. Mol Cell Endocrinol 289:94-101
Cui, Tracy Xiao; Kwok, Roland; Schwartz, Jessica (2008) Cooperative regulation of endogenous cAMP-response element binding protein and CCAAT/enhancer-binding protein beta in GH-stimulated c-fos expression. J Endocrinol 196:89-100
Cesena, Teresa I; Cui, Tracy Xiao; Piwien-Pilipuk, Graciela et al. (2007) Multiple mechanisms of growth hormone-regulated gene transcription. Mol Genet Metab 90:126-33
Cesena, Teresa I; Cardinaux, Jean-Rene; Kwok, Roland et al. (2007) CCAAT/enhancer-binding protein (C/EBP) beta is acetylated at multiple lysines: acetylation of C/EBPbeta at lysine 39 modulates its ability to activate transcription. J Biol Chem 282:956-67
Huo, Jeffrey S; McEachin, Richard C; Cui, Tracy Xiao et al. (2006) Profiles of growth hormone (GH)-regulated genes reveal time-dependent responses and identify a mechanism for regulation of activating transcription factor 3 by GH. J Biol Chem 281:4132-41

Showing the most recent 10 out of 20 publications