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PGE2 Elevates IL-23 Production in Human Dendritic Cells via a cAMP Dependent Pathway
Quanxing Shi1, Zhao Yin1, Bei Zhao1
1Department of Cardiology, The 306th Hospital, The Chinese People's Liberation Army, Beijing 100101, China.
Mediators of Inflammation
|September 29, 2015
Summary
Prostaglandin E2 (PGE2) increases Interleukin-23 (IL-23) production in human dendritic cells (DCs) through a cyclic AMP (cAMP) dependent pathway, contrasting its inhibitory effect in human monocytes.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Prostaglandin E2 (PGE2) exhibits differential effects on Interleukin-23 (IL-23) production, stimulating it in mouse dendritic cells (DCs) but inhibiting it in human monocytes.
- The precise mechanisms and cell-type specificity of PGE2's influence on IL-23 production remain incompletely understood.
Purpose of the Study:
- To investigate the effect of PGE2 on IL-23 production in human monocyte-derived dendritic cells (Mo-DCs).
- To elucidate the underlying molecular mechanisms mediating PGE2's action on IL-23 production in human Mo-DCs.
Main Methods:
- Human Mo-DCs were treated with PGE2 and subsequently stimulated with zymosan.
- Analysis of IL-23 production, p19 promoter activity, and mRNA levels of IL-23 subunits (p19 and p40).
- Pharmacological manipulation using cAMP analogs (db-cAMP), adenylate cyclase activators (forskolin), and protein kinase A (PKA) inhibitors (rp-cAMP).
Main Results:
- PGE2 significantly promoted zymosan-induced IL-23 production in human Mo-DCs in a concentration-dependent manner.
- PGE2 enhanced MyD88-mediated IL-23 p19 promoter activity and increased mRNA expression of both p19 and p40 subunits.
- The effects of PGE2 were mimicked by cAMP-elevating agents and blocked by a PKA inhibitor, indicating a cAMP-dependent pathway.
Conclusions:
- PGE2 elevates IL-23 production in human Mo-DCs.
- The mechanism involves a cyclic AMP (cAMP)-dependent pathway, highlighting a distinct cellular response compared to human monocytes.
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