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Prostacyclin analogs inhibit fibroblast migration
Tadashi Kohyama1, Xiangde Liu, Hui Jung Kim
1Pulmonary and Critical Care Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198-5125, USA.
Abstract:
The controlled accumulation of fibroblasts to sites of inflammation is crucial to effective tissue repair after injury. Either inadequate or excessive accumulation of fibroblasts could result in abnormal tissue function. Prostacyclin (PGI(2)) is a potent mediator in the coagulation and inflammatory processes. The aim of this study was to investigate the effect of PGI(2) on chemotaxis of human fetal lung fibroblasts (HFL-1). Using the blind well chamber technique, we found that the PGI(2) analog carbaprostacyclin (10(-6) M) inhibited HFL-1 chemotaxis to human plasma fibronectin (20 microg/ml) 58.0 +/- 13.2% (P < 0.05) and to platelet-derived growth factor (PDGF)-BB (10 ng/ml) 48.7 +/- 4.6% (P < 0.05). Checkerboard analysis demonstrated that carbaprostacyclin inhibits both directed and undirected migration. The inhibitory effect of the carbaprostacyclin was concentration dependent and blocked by the cAMP-dependent protein kinase (PKA) inhibitor KT-5720, suggesting that a cAMP-PKA pathway may be involved in the process. Two other PGI(2) analogs, ciprostene and dehydro-15-cyclohexyl carbaprostacyclin (both 10(-6) M), significantly inhibited fibroblast migration to fibronectin. In summary, PGI(2) appears to inhibit fibroblast chemotaxis to fibronectin and PDGF-BB. Such an effect may contribute to the regulation of fibroblasts in wound healing and could contribute to the pathogenesis of diseases characterized by abnormal tissue repair remodeling.
Insights
Prostacyclin (PGI(2)) inhibits fibroblast migration, a key process in wound healing. This finding suggests PGI(2) may regulate tissue repair and impact diseases with abnormal healing.
Area of Science:
- Cell Biology
- Biochemistry
- Tissue Repair Mechanisms
Background:
- Fibroblast accumulation is vital for tissue repair, but imbalances can cause dysfunction.
- Prostacyclin (PGI(2)) is a key mediator in inflammation and coagulation.
Purpose of the Study:
- To investigate the impact of Prostacyclin (PGI(2)) on human fetal lung fibroblast (HFL-1) chemotaxis.
- To explore the role of PGI(2) in regulating fibroblast migration during tissue repair.
Main Methods:
- Utilized the blind well chamber technique to assess fibroblast migration.
- Employed checkerboard analysis to differentiate directed and undirected cell movement.
- Investigated the involvement of the cAMP-dependent protein kinase (PKA) pathway.
Main Results:
- Carbaprostacyclin, a PGI(2) analog, significantly inhibited HFL-1 chemotaxis to fibronectin and PDGF-BB.
- Inhibitory effects were concentration-dependent and blocked by a PKA inhibitor.
- Other PGI(2) analogs also demonstrated significant inhibition of fibroblast migration.
Conclusions:
- PGI(2) inhibits fibroblast chemotaxis, suggesting a role in regulating fibroblast behavior.
- This mechanism may influence wound healing processes and the pathogenesis of diseases involving abnormal tissue remodeling.