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Substance P activates leukocytes and platelets in rabbit microvessels
A Ohlén1, A Thureson-Klein, L Lindbom
1Department of Physiology I, Karolinska Institutet, Stockholm, Sweden.
Blood Vessels
|January 1, 1989
Summary
Substance P triggers leukocyte and platelet aggregation and migration in rabbit muscle. Calcitonin gene-related peptide significantly reduced these effects, offering a potential therapeutic target.
Area of Science:
- Vascular biology
- Immunology
- Pharmacology
Background:
- Substance P is a neuropeptide involved in inflammatory responses.
- Leukocyte and platelet activation are key events in microvascular inflammation.
Purpose of the Study:
- To investigate the effects of substance P on leukocytes and platelets in rabbit skeletal muscle microvasculature.
- To explore the potential inhibitory role of calcitonin gene-related peptide.
Main Methods:
- Intravital microscopy was used to observe dynamic microvascular events.
- Electron microscopy provided detailed ultrastructural analysis.
- Autacoid antagonists and calcitonin gene-related peptide were used as pharmacological interventions.
Main Results:
- Substance P induced vasodilatation, platelet-leukocyte aggregate formation, and leukocyte extravasation.
- Neutrophils showed partial degranulation.
- Autacoid antagonists did not prevent substance P-induced aggregation.
- Calcitonin gene-related peptide significantly inhibited aggregate formation and leukocyte extravasation.
Conclusions:
- Substance P plays a significant role in initiating inflammatory microvascular responses.
- Calcitonin gene-related peptide demonstrates potent inhibitory effects on substance P-mediated microvascular inflammation.