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FMLP-activated neutrophils evoke histamine release from mast cells
Abstract:
Human neutrophils, having been activated by the chemotactic peptide N-formylmethionyl-leucyl-phenylalanine (FMLP), evoke histamine release from rat serosal mast cells. The release is dependent on FMLP concentration and it can be inhibited by disodium cromoglycate and by a flavonoid, silymarin, which displays free radical scavenging properties. Silymarin inhibition of neutrophil-mediated histamine release is dose-dependent. These results further stress the concept of a neutrophil-mast cell interaction, which may be involved in inflammatory processes.
Insights
Activated human neutrophils trigger histamine release from mast cells. This process, involving neutrophil-mast cell interaction, can be inhibited by silymarin, a compound with antioxidant properties.
Area of Science:
- Immunology
- Cell Biology
- Pharmacology
Background:
- Neutrophils and mast cells are key immune cells involved in inflammatory responses.
- Chemotactic peptides like N-formylmethionyl-leucyl-phenylalanine (FMLP) activate neutrophils.
- Mast cells release histamine, a mediator of inflammation.
Purpose of the Study:
- To investigate the interaction between activated human neutrophils and rat serosal mast cells.
- To determine the role of N-formylmethionyl-leucyl-phenylalanine (FMLP) in mediating histamine release.
- To evaluate the inhibitory effects of disodium cromoglycate and silymarin on neutrophil-induced histamine release.
Main Methods:
- Activation of human neutrophils with N-formylmethionyl-leucyl-phenylalanine (FMLP).
- Incubation of activated neutrophils with rat serosal mast cells.
- Measurement of histamine release.
- Assessment of inhibition by disodium cromoglycate and silymarin.
Main Results:
- Activated human neutrophils induced histamine release from rat serosal mast cells.
- Histamine release was dependent on FMLP concentration.
- Disodium cromoglycate and silymarin inhibited neutrophil-mediated histamine release.
- Silymarin's inhibitory effect was dose-dependent and linked to its free radical scavenging properties.
Conclusions:
- Human neutrophils and mast cells interact, influencing inflammatory processes.
- Silymarin, through its antioxidant activity, can modulate neutrophil-mast cell interactions.
- This study highlights a potential therapeutic target for inflammatory conditions involving these cells.