Related Experiment Videos
Decrease of Bcl-xL and augmentation of thymocyte apoptosis in GILZ overexpressing transgenic mice.
Domenico Vittorio Delfino1, Massimiliano Agostini, Stefania Spinicelli
1Section of Pharmacology, Department of Clinical and Experimental Medicine, University of Perugia, Via del Giochetto, 06122 Perugia, Italy. midelfin@unipg.it
Blood
|August 21, 2004
Summary
Glucocorticoid-induced leucine zipper (GILZ) promotes thymocyte apoptosis by reducing Bcl-xL and activating caspases. Overexpressing GILZ in T-cells influences thymus function and apoptosis regulation.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Glucocorticoids are key regulators of thymocyte apoptosis and gene expression.
- Glucocorticoid-induced leucine zipper (GILZ) is upregulated in the thymus during glucocorticoid exposure.
Purpose of the Study:
- To investigate the function of GILZ in T-cell lineage and its role in thymocyte apoptosis.
- To characterize the influence of GILZ overexpression on thymus function in transgenic mice.
Main Methods:
- Generation of transgenic mice overexpressing GILZ in the T-cell lineage.
- Analysis of thymocyte apoptosis, cell populations (CD4, CD8), and apoptotic pathway markers (Bcl-xL, caspase-8, caspase-3).
- In vitro experiments delivering GILZ into wild-type thymocytes using a TAT peptide fusion protein.
Main Results:
- Transgenic mice overexpressing GILZ showed decreased CD4(+)CD8(+) thymocytes and increased apoptosis.
- Apoptotic pathway analysis revealed reduced Bcl-xL and increased caspase-8 and caspase-3 activation.
- GILZ delivery in wild-type thymocytes decreased Bcl-xL and induced apoptosis; aged mice exhibited amplified thymic subset perturbations.
Conclusions:
- GILZ plays a significant role in regulating thymocyte apoptosis.
- The findings support the hypothesis that GILZ participates in glucocorticoid-mediated thymocyte apoptosis.