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Altered pain perception and inflammatory response in mice lacking prostacyclin receptor
T Murata1, F Ushikubi, T Matsuoka
1Department of Pharmacology, Faculty of Medicine, Kyoto University, Sakyo, Japan.
Nature
|August 14, 1997
Summary
Prostacyclin receptor knockout mice show increased thrombosis but reduced inflammation and pain. This study identifies prostacyclin as a key mediator in vascular homeostasis, inflammation, and pain signaling.
Area of Science:
- Biomedical Sciences
- Molecular Biology
- Cardiovascular Research
Background:
- Prostanoids, including prostaglandins (PGs) and thromboxanes, are local mediators with diverse physiological roles.
- Prostacyclin (PGI2) is known to inhibit platelet aggregation and cause vasodilation, crucial for vascular homeostasis.
- Aspirin-like drugs inhibit prostanoid biosynthesis, affecting fever, inflammation, pain, and reproduction, but specific mediator roles remain unclear.
Purpose of the Study:
- To investigate the in vivo role of the prostacyclin receptor (IP receptor).
- To elucidate the specific functions of prostacyclin in thrombosis, inflammation, and pain.
Main Methods:
- Gene disruption of the prostacyclin receptor in mice using homologous recombination.
- Phenotypic analysis of prostacyclin receptor-deficient mice, including assessment of thrombosis, inflammation, and pain responses.
- Comparison with indomethacin-treated wild-type mice.
Main Results:
- Prostacyclin receptor-deficient mice were viable, reproductive, and normotensive.
- These mice exhibited increased susceptibility to thrombosis.
- Inflammatory and pain responses were significantly reduced in receptor-deficient mice, similar to indomethacin-treated controls.
Conclusions:
- Prostacyclin acts as a critical endogenous antithrombotic agent in vivo.
- The prostacyclin receptor mediates key aspects of inflammation and pain.
- This study provides definitive evidence for prostacyclin's role in vascular homeostasis, thrombosis, inflammation, and pain.