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Protein kinase C regulates Fas (CD95/APO-1) expression
1Department of Immunology, Jerome H. Holland Laboratory, American Red Cross, Rockville, MD 20855, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|September 2, 1998
Summary
Protein Kinase C (PKC) activation regulates Fas expression, a key protein in apoptosis. PKC influences Fas expression through the TDAG51 gene, independent of calcium signaling.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Fas (CD95/APO-1) is a TNF receptor family member inducing apoptosis upon ligation.
- Mechanisms regulating Fas expression remain largely unknown.
- Understanding Fas regulation is crucial for controlling cell death.
Purpose of the Study:
- To investigate the role of Protein Kinase C (PKC) in regulating Fas expression.
- To elucidate the signaling pathways involved in activation-induced Fas expression.
- To identify novel genes involved in Fas regulation.
Main Methods:
- Utilized a murine T cell hybridoma model (A1.1).
- Employed PKC inhibitors and activators (PMA, 1-oleoyl-2-acetyl-sn-glycerol).
- Assessed Fas and FasL expression, calcium mobilization, and TDAG51 gene expression.
Main Results:
- PKC inhibitors blocked activation-induced Fas expression and apoptosis.
- PKC activation mimicked TCR signals, inducing Fas but not FasL expression.
- Fas expression was independent of calcium mobilization but dependent on TDAG51 expression.
- PKC activation induced Fas expression only in cells with wild-type TDAG51.
Conclusions:
- Fas expression is regulated by PKC activity.
- PKC mediates Fas expression, likely through the TDAG51 gene.
- This pathway offers potential targets for modulating apoptosis.