Editor-in-Chief: Brüne, Bernhard
Editorial Board Member: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Sies, Helmut / Turk, Boris / Wittinghofer, Alfred
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Molecular Genetic Analysis of Glucocorticoid Signaling Using the Cre/loxP System
Citation Information: Biological Chemistry. Volume 381, Issue 9-10, Pages 961–964, ISSN (Print) 1431-6730, DOI: 10.1515/BC.2000.118, July 2005
- Published Online:
Glucocorticoids (GC) are involved in a plethora of physiological processes that range from the regulation of the stress response and the control of the immune system to modulation of behavior. Most GC effects are mediated by the glucocorticoid receptor (GR) via activation and repression of gene expression. Whereas in most cases activation requires DNA binding of the receptor, repression is usually mediated by protein-protein interaction with other transcription factors. To decipher the molecular mode of action of GR, mice were generated by gene targeting carrying a point mutation in one of the dimerization domains, thus abrogating DNA binding by GR. Analysis of these mice demonstrated that thymocyte apoptosis and stress erythropoiesis require the DNA binding-dependent function of GR, whereas lung development and the anti-inflammatory activity of GR are mediated by protein-protein interaction. Furthermore, to study the role of GC in the brain, mice were generated specifically lacking GR function in the nervous system. Using these mice we demonstrated that GR is essential for the regulation of the HPA-axis and the stress response, as well as for the control of emotional behavior. Taken together, gene targeting using the Cre/loxP system proved to be highly valuable for the analysis of both molecular mechanism and tissue-specific functions of the GR.
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