The activities of steroid receptors (SR) are regulated both by hormones and by alterations in cell signaling pathways. Our goal is to understand how phosphorylation regulates the activity of the human progesterone receptor (PR) :
Specific Aim # l: To utilize state of the art, high sensitivity mass spectrometry to identify additional phosphorylation sites and/or other post- translational modifications in PR.
Specific Aim #2. To develop and characterize novel phosphorylation site-specific antibodies for analysis of the role of phosphorylation in receptor structure and function. We have already produced two phosphorylation site-specific antibodies and applied them to an analysis of cross-talk with PR. These antibodies and the new ones to be made in this aim will permit uniquely powerful approaches to studying regulation of PR phosphorylation.
Specific Aim #3 : To assess the role of phosphorylation in specific receptor functions. We will test our hypothesis that two important functions of PR phosphorylation are l: to regulate transcriptional activity through modulation of protein/protein interactions (both intramolecular and intermolecular) and 2: to regulate receptor turnover.
Specific Aim #4 : To examine the hypothesis that an additional important function for phosphorylation is to integrate PR with other signaling pathways, we will use novel phosphorylation site specific antibodies as probes for specific phosphorylations, we will elucidate the cell signaling pathways that regulate PR phosphorylation and activity. Modulation of cell signaling pathways alters PR activity and can even cause antagonists to act as agonists, but the pathways and mechanisms by which this occurs are not well understood. We will use the phosphorylation site specific antibodies as an aid in defining the pathways and kinases responsible for specific phosphorylations, leading to altered receptor activation and to examine cell cycle effects on receptor phosphorylation and function. Understanding the interplay between steroid receptors and cell signaling pathways will aid in understanding the normal actions of agonists and antagonists as well as the changes that occur in diseases such as hormone dependent cancer where cell signaling is altered.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
3R01CA057539-10S1
Application #
6579113
Study Section
Biochemical Endocrinology Study Section (BCE)
Program Officer
Rosenfeld, Bobby
Project Start
1993-04-15
Project End
2005-03-31
Budget Start
2002-04-01
Budget End
2003-03-31
Support Year
10
Fiscal Year
2002
Total Cost
$64,243
Indirect Cost
Name
Baylor College of Medicine
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
074615394
City
Houston
State
TX
Country
United States
Zip Code
77030
Treviño, Lindsey S; Bolt, Michael J; Grimm, Sandra L et al. (2016) Differential Regulation of Progesterone Receptor-Mediated Transcription by CDK2 and DNA-PK. Mol Endocrinol 30:158-72
Grimm, Sandra L; Ward, Robert D; Obr, Alison E et al. (2014) A role for site-specific phosphorylation of mouse progesterone receptor at serine 191 in vivo. Mol Endocrinol 28:2025-37
Moore, Nicole L; Edwards, Dean P; Weigel, Nancy L (2014) Cyclin A2 and its associated kinase activity are required for optimal induction of progesterone receptor target genes in breast cancer cells. J Steroid Biochem Mol Biol 144 Pt B:471-82
Treviño, Lindsey S; Bingman 3rd, William E; Edwards, Dean P et al. (2013) The requirement for p42/p44 MAPK activity in progesterone receptor-mediated gene regulation is target gene-specific. Steroids 78:542-7
Treviño, Lindsey S; Weigel, Nancy L (2013) Phosphorylation: a fundamental regulator of steroid receptor action. Trends Endocrinol Metab 24:515-24
Moore, Nicole L; Weigel, Nancy L (2011) Regulation of progesterone receptor activity by cyclin dependent kinases 1 and 2 occurs in part by phosphorylation of the SRC-1 carboxyl-terminus. Int J Biochem Cell Biol 43:1157-67
Ward, Robert D; Weigel, Nancy L (2009) Steroid receptor phosphorylation: Assigning function to site-specific phosphorylation. Biofactors 35:528-36
Weigel, N L; Moore, N L (2007) Cyclins, cyclin dependent kinases, and regulation of steroid receptor action. Mol Cell Endocrinol 265-266:157-61
Moore, Nicole L; Narayanan, Ramesh; Weigel, Nancy L (2007) Cyclin dependent kinase 2 and the regulation of human progesterone receptor activity. Steroids 72:202-9
Weigel, Nancy L; Moore, Nicole L (2007) Steroid receptor phosphorylation: a key modulator of multiple receptor functions. Mol Endocrinol 21:2311-9

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