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Neutrophil-activating intercrine secreted by porcine platelets is active without proteolytic processing
1Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania 19140.
The American Journal of Physiology
|November 1, 1993
Summary
Researchers isolated porcine neutrophil-activating peptide 2 (pNAP-2), finding two forms (pNAP-2-L and pNAP-2-S). Both forms activate neutrophils, but porcine platelets secrete active pNAP-2, unlike humans.
Area of Science:
- Immunology
- Biochemistry
Background:
- Porcine neutrophil-activating peptide 2 (pNAP-2) is a novel member of the intercrine alpha-subfamily.
- Neutrophil-activating peptides play crucial roles in inflammatory responses.
Purpose of the Study:
- To isolate and characterize porcine neutrophil-activating peptide 2 (pNAP-2).
- To investigate the functional activities and activation mechanisms of pNAP-2 forms.
Main Methods:
- Isolation and purification of pNAP-2.
- Amino acid sequencing to determine molecular structure.
- Functional assays measuring neutrophil calcium mobilization and elastase release.
- Comparative analysis with human neutrophil-activating peptide 2 (hNAP-2).
Main Results:
- Two forms of pNAP-2 were identified: pNAP-2-L (long) and pNAP-2-S (short).
- pNAP-2-S shares 65% homology with hNAP-2, including conserved cysteines and the N-terminal Glu-Leu-Arg sequence.
- Both pNAP-2 forms induce neutrophil activation, with pNAP-2-S being more potent.
- Porcine platelets secrete active pNAP-2 upon thrombin stimulation, independent of neutrophil involvement.
Conclusions:
- Porcine neutrophil-activating peptide 2 exists in two forms with distinct activities.
- pNAP-2 plays a role in neutrophil activation and inflammatory processes in pigs.
- The mechanism of pNAP-2 secretion differs between pigs and humans, with porcine platelets releasing active forms.