Cited by 124Cytokine Signaling Pathways and InteractionsEstrogen and related hormone effectsGrowth Hormone and Insulin-like Growth Factors

Glucocorticoid Receptor/Signal Transducer and Activator of Transcription 5 (STAT5) Interactions Enhance STAT5 Activation by Prolonging STAT5 DNA Binding and Tyrosine Phosphorylation

Wyszomierski, Shannon L., Yeh, Juddi, Rosen, Jeffrey M.·1999·Molecular Endocrinology

Abstract

The regulation of casein gene expression by both PRL and glucocorticoids has been a well studied paradigm for understanding how the signaling pathways regulated by these two hormones interact in the nucleus. Previous studies have demonstrated that the downstream effectors of these pathways, signal transducer and activator of transcription 5 (STAT5) and the glucocorticoid receptor (GR), are associated via protein-protein interactions and act synergistically to enhance beta-casein gene transcription. Indirect immunofluorescence microscopy was used to demonstrate that PRL-activated STAT5 can translocate GR into the nucleus, and that ligand-bound GR can translocate STAT5 into the nucleus. This provided further support of an interaction between the two proteins. To better understand the mechanism of transcriptional synergy between STAT5 and GR, experiments were performed in cells transiently transfected with STAT5 alone or with STAT5 and GR. GR cotransfection enhanced the DNA-binding activity of STAT5 without affecting STAT5 protein levels. The enhancement of STAT5 DNA binding by GR resulted in the formation of a complex that exhibited prolonged DNA binding after PRL treatment. This was correlated with increased STAT5 tyrosine phosphorylation, suggesting that GR enhances STAT5 DNA binding by modulating the rate of STAT5 dephosphorylation. In contrast, cotransfection of the estrogen receptor resulted in an overall decrease in STAT5 tyrosine phosphorylation, without changing the kin…

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Crossref · 10.1210/mend.13.2.0232

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Authors
Wyszomierski, S. L., Yeh, J., & Rosen, J. M.
Affiliations
  • Baylor College of Medicine (US)
  • The University of Texas at San Antonio Health Science Center (US)
Corresponding author
Rosen, Jeffrey M.
Venue
Molecular Endocrinology
Published
1999-02
Volume
13
Issue
2
Pages
330-343
ISSN
  • 0888-8809 (ISSN-L)
  • 1944-9917
OpenAlex
W2091020488
Cited by
124
References
52
Citations by year
2025: 1 · 2024: 2 · 2023: 2 · 2022: 3 · 2021: 1 · 2020: 1 · 2018: 2 · 2017: 2 · 2016: 4 · 2015: 5 · 2014: 5 · 2013: 4 · 2012: 4
FWCI
3.72
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (CA-16303)
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
Keywords
glucocorticoid receptor, STAT5, protein-protein interaction, transcriptional synergy, prolactin, nuclear translocation, estrogen receptor
MeSH terms
Animals, Caseins, Chlorocebus aethiops, DNA-Binding Proteins, Electrophoresis, Polyacrylamide Gel, Cricetinae, Milk Proteins, Phosphorylation, Plasmids, Prolactin, Receptors, Estrogen, Receptors, Glucocorticoid, Transfection, Tyrosine, Blotting, Western, Trans-Activators, CHO Cells, Fluorescent Antibody Technique, Indirect, COS Cells, STAT5 Transcription Factor

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