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Functional interaction between the pro-apoptotic DAP3 and the glucocorticoid receptor
Sanna M Hulkko1, Johanna Zilliacus
1Department of Medical Nutrition, Karolinska Institutet, Novum, S-141 86 Huddinge, Sweden.
Biochemical and Biophysical Research Communications
|July 9, 2002
Summary
Death-associated protein 3 (DAP3) enhances glucocorticoid receptor (GR) levels and activity. Full-length DAP3, not just its N-terminal domain, is crucial for this interaction and the pro-apoptotic effect.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Apoptosis is vital for development and immunity.
- Glucocorticoids regulate cellular functions, including apoptosis.
- Previous work showed death-associated protein 3 (DAP3) interacts with glucocorticoid receptor (GR).
Purpose of the Study:
- To investigate how DAP3 influences GR levels and activity.
- To determine the role of DAP3 domains in GR interaction and function.
- To elucidate the mechanism of DAP3-mediated apoptosis regulation.
Main Methods:
- Coexpression of DAP3 and GR in cellular systems.
- Analysis of GR levels and subcellular localization.
- Assessment of GR transcriptional activity.
- Domain-specific analysis of DAP3 function.
Main Results:
- Coexpression of DAP3 and GR increased cellular GR amounts.
- Partial translocation of DAP3 to the nucleus was observed.
- The N-terminal domain of DAP3 mediated GR interaction, but full-length DAP3 was required for increased GR levels and enhanced transcriptional activity.
- Full-length DAP3 was also necessary for the pro-apoptotic effect.
Conclusions:
- DAP3 enhances GR stability and transcriptional function.
- The interplay between DAP3's N- and C-termini is essential for its cellular functions, including apoptosis regulation.
- DAP3 acts as a key modulator of glucocorticoid signaling pathways.