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Secretory phospholipase A2 induces dendritic cell maturation
Laure Perrin-Cocon1, Sophie Agaugué, Frédéric Coutant
1Institut Fédératif de Recherche 128, Institut National de la Santé et de la Recherche Médicale Unit 503, F-69365 Lyon Cedex 07, France.
European Journal of Immunology
|July 20, 2004
Summary
Phospholipase A(2) (PLA(2)) promotes the development of mature dendritic cells (DC) during the acute-phase response. This enzyme activity is crucial for bridging innate and adaptive immunity.
Area of Science:
- Immunology
- Biochemistry
Background:
- Phospholipase A(2) (PLA(2)) activity is elevated during the acute-phase response (APR) and linked to inflammatory diseases.
- Extracellular PLA(2) contributes to inflammation propagation by releasing lipid mediators.
Purpose of the Study:
- To investigate the role of group III secretory PLA(2) in the generation of mature human dendritic cells (DC).
Main Methods:
- Monocytes were treated with PLA(2) in the presence of GM-CSF and IL-4.
- Phenotypical and functional characteristics of mature DC were assessed.
- NF-kappaB, AP-1, and NFAT activation were analyzed.
Main Results:
- PLA(2) treatment induced the generation of functionally mature human DC.
- Maturation was dose-dependent and correlated with enzyme activity.
- PLA(2)-generated DC stimulated IFN-gamma secretion by T cells, indicating activation of adaptive immunity.
Conclusions:
- PLA(2) plays a significant role in DC maturation.
- This process involves the activation of transcription factors like NF-kappaB, AP-1, and NFAT.
- PLA(2) activity may facilitate the transition from innate to adaptive immunity during the APR.