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Proteinase-activated receptor-2: expression by human neutrophils
G L Howells1, M G Macey, C Chinni
1Department of Oral Pathology, St Bartholomew's and the Royal London School of Medicine and Dentistry, UK.
Journal of Cell Science
|April 1, 1997
Summary
Neutrophils express proteinase-activated receptor-2 (PAR-2), which activates immune cells. This receptor
Area of Science:
- Immunology
- Cell Biology
Background:
- Neutrophils are key immune cells involved in inflammatory responses.
- Proteinase-activated receptor-2 (PAR-2) is a G protein-coupled receptor implicated in various cellular functions.
Purpose of the Study:
- To investigate the expression and function of PAR-2 in human neutrophils.
- To characterize neutrophil activation mediated by PAR-2.
Main Methods:
- Flow cytometry was used to detect PAR-2 expression on granulocytes.
- Neutrophil activation was assessed by measuring light scatter and CD11b expression.
- Intracellular calcium mobilization was analyzed in response to PAR-2 activation.
Main Results:
- Human granulocytes express PAR-2, confirmed by antibody staining.
- A specific peptide activating PAR-2 (RAP) induced neutrophil activation, including increased CD11b expression and light scatter.
- PAR-2 activation also led to intracellular calcium increases, with significant donor variability.
- Priming neutrophils enhanced the CD11b response to RAP.
- The effects of RAP were specific, as an acetylated version showed no activity.
Conclusions:
- Neutrophils express functional PAR-2, contributing to their activation.
- PAR-2 signaling in neutrophils is associated with calcium flux and CD11b upregulation.
- Donor-dependent variations in PAR-2 responsiveness highlight potential complexities in neutrophil function.