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Mononuclear cell modulation of fibroblast procoagulant activity
The Journal of Laboratory and Clinical Medicine
|May 1, 1982
Summary
Immune cells can suppress the procoagulant activity (PCA) of fibroblasts, which may prevent blood clots in inflammatory conditions. This suppression is mediated by prostaglandins, highlighting a key interaction in inflammation.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Connective tissue cells release procoagulant material upon injury, potentially initiating blood coagulation and contributing to inflammatory lesions.
- Tissue Factor (TF) is a key procoagulant synthesized by fibroblasts.
Purpose of the Study:
- To investigate the role of mononuclear cells in regulating fibroblast procoagulant activity (PCA).
- To elucidate the mechanism by which mononuclear cells inhibit TF generation in fibroblasts.
Main Methods:
- Human foreskin fibroblasts were cultured in vitro.
- Supernatants from PHA-stimulated human mononuclear cells (MC-SNs) were added to fibroblast cultures.
- Procoagulant activity (TF generation) and prostaglandin E2 (PGE2) synthesis were measured.
- Indomethacin was used to investigate the role of prostaglandins.
Main Results:
- Fibroblasts synthesized high levels of TF.
- MC-SNs significantly inhibited TF generation by fibroblasts.
- This inhibition was associated with a 20-fold increase in fibroblast PGE2 synthesis.
- Indomethacin reversed the inhibitory effect of MC-SNs, indicating prostaglandin mediation.
Conclusions:
- Mononuclear cells suppress fibroblast TF generation through the stimulation of endogenous prostaglandin synthesis.
- This immune cell-mediated regulation of fibroblast PCA may be crucial in the pathogenesis of inflammatory lesions.