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Functional expression of CD134 by neutrophils
Ralf Baumann1, Shida Yousefi, Dagmar Simon
1Department of Pharmacology, University of Bern, Friedbühlstrasse 49, CH-3010 Bern, Switzerland.
European Journal of Immunology
|July 20, 2004
Summary
This study reveals that CD134 (OX40) on neutrophils delays their apoptosis by inhibiting caspase-3 activation. This finding suggests CD134 plays a role in innate immunity beyond adaptive T cell responses.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- CD134 (OX40) is a TNF receptor superfamily member found on activated T cells.
- Neutrophil apoptosis is crucial for resolving inflammation and preventing tissue damage.
Purpose of the Study:
- To investigate the expression and function of CD134 on human neutrophils.
- To determine the role of CD134 in regulating neutrophil survival and apoptosis.
Main Methods:
- Flow cytometry to detect CD134 expression on neutrophils.
- In vitro assays to assess the effect of CD134 ligand on neutrophil apoptosis.
- Western blotting to analyze apoptotic markers like caspase-3, Mcl-1, Bid, and Bax.
Main Results:
- Human peripheral blood neutrophils express CD134.
- Activation of CD134 by its ligand delayed caspase-3 activation and neutrophil apoptosis.
- CD134 ligand maintained anti-apoptotic Mcl-1 levels and inhibited cleavage of Bid and Bax.
Conclusions:
- CD134 signaling regulates neutrophil survival by inhibiting apoptosis pathways.
- CD134 contributes to innate immune responses, not solely adaptive immunity.
- Targeting CD134 may offer therapeutic strategies for inflammatory conditions.