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Cloning and characterization of a murine platelet-activating factor receptor gene
1Department of Biochemistry, Faculty of Medicine, University of Tokyo.
Abstract:
A murine gene encoding a platelet-activating factor receptor (PAFR) was cloned. The gene was mapped to a distal region of chromosome 4 both by fluorescence in situ hybridization and by molecular linkage analysis. Northern blot analysis showed a high expression of the PAFR message in peritoneal macrophages. When C3H/HeN macrophages were treated with bacterial lipopolysaccharide (LPS) or synthetic lipid A, the PAFR gene expression was induced. Bacterial LPS, but not lipid A, induced the level of PAFR mRNA in LPS-unresponsive C3H/HeJ macrophages. These induction patterns were parallel to those of tumor necrosis factor-alpha mRNA. Thus, the PAFR in macrophages plays important roles in LPS-induced pathologies.
Insights
The platelet-activating factor receptor (PAFR) gene in mice was cloned and mapped. Macrophage PAFR expression is induced by bacterial lipopolysaccharide, suggesting its role in inflammatory responses.
Area of Science:
- Immunology
- Genetics
- Molecular Biology
Background:
- Platelet-activating factor receptor (PAFR) plays a role in inflammatory processes.
- Understanding the genetic regulation of PAFR is crucial for studying immune responses.
Purpose of the Study:
- To clone and characterize the murine platelet-activating factor receptor (PAFR) gene.
- To investigate the regulation of PAFR gene expression in macrophages, particularly in response to bacterial lipopolysaccharide (LPS).
Main Methods:
- Gene cloning and mapping using fluorescence in situ hybridization and molecular linkage analysis.
- Northern blot analysis to assess PAFR gene expression.
- Treatment of macrophages with bacterial lipopolysaccharide (LPS) and lipid A to study gene induction.
Main Results:
- The murine PAFR gene was successfully cloned and mapped to chromosome 4.
- High expression of PAFR mRNA was observed in peritoneal macrophages.
- Bacterial LPS induced PAFR gene expression in LPS-responsive macrophages (C3H/HeN) but not in LPS-unresponsive macrophages (C3H/HeJ).
- Tumor necrosis factor-alpha mRNA induction patterns paralleled PAFR mRNA induction.
Conclusions:
- The PAFR gene in mice has been identified and localized.
- Macrophage PAFR expression is significantly influenced by bacterial LPS.
- PAFR in macrophages is implicated in the pathogenesis of LPS-induced inflammatory conditions.