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Published on: January 30, 2009
Is p75NGFR involved in developmental neural cell death?
1University of California, Los Angeles 90024-1769.
Abstract:
The tumor necrosis factor receptor superfamily includes twelve members, at least two of which--tumor necrosis factor receptor I and FAS/Apo-1--induce cell death following ligand binding. This review summarizes data suggesting that two other members of the family--p75NGFR and CD40--achieve a similar effect in the inverse fashion; they induce apoptosis constitutively when unbound by their respective ligands, with the induction of apoptosis being inhibited by the binding of their respective ligands. The potential roles that such receptors may play in development and pathological processes are discussed.
Insights
Certain tumor necrosis factor receptors induce cell death when unbound, unlike others that require ligand binding. This suggests novel roles for p75NGFR and CD40 in biological processes.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- The tumor necrosis factor receptor superfamily comprises twelve members.
- Two known members, tumor necrosis factor receptor I and FAS/Apo-1, induce apoptosis upon ligand binding.
Purpose of the Study:
- To review evidence suggesting p75NGFR and CD40 induce apoptosis constitutively when unbound.
- To discuss the potential roles of these receptors in development and disease.
Main Methods:
- Literature review of studies on tumor necrosis factor receptor superfamily members.
- Analysis of data on p75NGFR and CD40 signaling pathways.
Main Results:
- p75NGFR and CD40 may induce apoptosis constitutively in the absence of ligand binding.
- Ligand binding to p75NGFR and CD40 appears to inhibit this constitutive apoptosis.
Conclusions:
- Receptors like p75NGFR and CD40 may have unique mechanisms for regulating cell death.
- Understanding these inverse signaling pathways is crucial for exploring their roles in development and pathology.
