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Cell-death signaling and human disease
Frédéric Rieux-Laucat1, Alain Fischer, Françoise Le Deist
1Institut National de la santé et de la Recherche Médicale U429, Hôpital Necker Enfants Malades, 149 rue de Sèvres, 75743 Paris Cedex 15, France. rieux@necker.fr
Current Opinion in Immunology
|June 6, 2003
Summary
Autoimmune lymphoproliferative syndrome (ALPS) involves apoptosis defects due to inherited mutations. These defects impact T-cell and B-cell proliferation, highlighting the complex genetic basis of immune dysregulation.
Area of Science:
- Immunology
- Genetics
- Cell Biology
Background:
- Autoimmune lymphoproliferative syndrome (ALPS) and the lpr mouse model represent primary apoptosis defects.
- These conditions stem from inherited mutations in death-receptors, particularly Fas and Fas ligand.
- Fas signaling is crucial for regulating T-cell and B-cell proliferation and maintaining self-tolerance.
Purpose of the Study:
- To elucidate the genetic basis and molecular mechanisms underlying ALPS.
- To understand the role of apoptosis pathways in immune homeostasis and autoimmune diseases.
- To investigate the connection between immune-receptor signaling and apoptosis defects.
Main Methods:
- Analysis of inherited death-receptor mutations in human ALPS patients and lpr mice.
- Investigation of caspase 10 and caspase 8 roles in apoptosis induction.
- Genetic studies to identify factors contributing to ALPS pathogenesis.
Main Results:
- Established Fas and Fas ligand as key regulators of lymphocyte proliferation in ALPS.
- Identified caspase 10 as important for apoptosis induction in ALPS.
- Revealed a link between caspase 8 defects, apoptosis, and immune-receptor signaling.
Conclusions:
- ALPS serves as a model for studying T-cell homeostasis and self-tolerance.
- The genetic complexity of ALPS involves multiple factors influencing pathogenesis.
- Defects in apoptosis pathways are central to the development of autoimmune lymphoproliferative disorders.