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PGD(2) modulates fibroblast-mediated native collagen gel contraction.
Tadashi Kohyama1, Todd A Wyatt, Xiangde Liu
1Department of Respiratory Medicine, University of Tokyo, Tokyo, Japan.
American Journal of Respiratory Cell and Molecular Biology
|September 3, 2002
Summary
Prostaglandin D2 (PGD2) promotes fibroblast-mediated tissue repair by stimulating collagen gel contraction. These pro-repair effects involve novel pathways distinct from its inflammatory signaling, offering therapeutic potential.
Area of Science:
- Biomedical Science
- Cell Biology
- Inflammation and Repair
Background:
- Tissue repair is crucial for restoring function after injury and inflammation.
- Inflammatory mediators can influence both immune cells and parenchymal cells involved in repair.
- Dysregulated repair contributes to diseases like bronchial asthma.
Purpose of the Study:
- To investigate the role of prostaglandin D2 (PGD2) in modulating fibroblast-mediated tissue repair.
- To utilize in vitro collagen gel contraction as a model system for assessing fibroblast repair functions.
Main Methods:
- Assessed PGD2's effect on fibroblast-mediated collagen gel contraction in a concentration- and time-dependent manner.
- Utilized specific receptor blockers (DP, TP) and kinase inhibitors (PKA, PKC) to elucidate signaling pathways.
- Investigated the involvement of novel prostaglandin D receptors and calcium-independent protein kinase C (PKC) pathways.
Main Results:
- PGD2 significantly stimulated collagen gel contraction, indicating enhanced fibroblast repair activity.
- A DP-receptor blocker (AH6809) inhibited both PGD2-stimulated and analog-inhibited contraction.
- PKC inhibition, particularly via calcium-independent pathways (PKC-epsilon), blocked PGD2's pro-repair effects, suggesting a novel signaling mechanism.
Conclusions:
- PGD2 plays a significant role in promoting tissue repair and remodeling.
- PGD2's pro-repair signaling pathways differ from its pro-inflammatory pathways (cAMP-PKA), allowing for targeted therapeutic interventions.
- This discovery opens avenues for selective manipulation of PGD2 signaling for therapeutic benefit in inflammatory diseases.