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Histamine release by chemotactic, formyl methionine-containing peptides
Journal of Immunology (Baltimore, Md. : 1950)
|August 1, 1976
Summary
Certain formyl peptides trigger histamine release from human basophils. This peptide-induced histamine release correlates with their ability to attract leukocytes, suggesting a role in immune responses.
Area of Science:
- Immunology
- Biochemistry
Background:
- Histamine release from basophils is a key immune response.
- Peptides can modulate immune cell activity.
Purpose of the Study:
- To investigate the histamine-releasing capacity of formyl dipeptides and tripeptides.
- To determine the structural requirements for peptide-induced histamine release.
- To correlate histamine release with leukocyte chemotaxis.
Main Methods:
- Incubation of human basophils with various formyl peptides.
- Measurement of histamine release.
- Assessment of chemotactic activity for rabbit leukocytes.
Main Results:
- Specific formyl dipeptides and tripeptides containing methionine released histamine from human basophils.
- N-formyl amino acids did not induce histamine release.
- Tripeptides were generally more potent than dipeptides.
- An acyl group was necessary for histamine release, but the N-terminal position of methionine was not essential.
- Histamine release strongly correlated with chemotactic activity.
Conclusions:
- Formyl peptides, particularly tripeptides, are potent histamine releasers from human basophils.
- The structure of the peptide, including the acyl group and methionine presence, influences histamine release.
- Peptide-induced histamine release is linked to leukocyte chemotaxis, indicating a potential role in inflammatory processes.