Abstract |
The role of endothelin B (ET(B)) receptors in inflammation and nociception was examined using ET(B) receptor knockout mice. Genotyping studies were used with tissues from ET(B)((+/+)), ET(B)((+/-)), and ET(B)((-/-)) mice to confirm the loss of ET(B) receptors. Algesia induced by phenylbenzoquinone was evident in the (+/+) mice, reduced by approximately 80% in the (+/-) mice, and absent in the (-/-) mice. Phenylbenzoquinone-induced algesia in (+/+) mice was inhibited 74% by the ET(B) receptor-selective antagonist A192621 (25 mg/kg p.o.), but unaffected by the ET(A) receptor-selective antagonist SB 234551 (25 mg/kg p.o.). Noninflammatory pain, induced by hotplate, was equivalent between (+/+) and (-/-) mice. The cutaneous inflammatory response to topical arachidonic acid (AA) also was evaluated. Whereas (+/+) mice had a marked inflammatory response to AA, the (+/-), and (-/-) mice had significantly reduced fluid phase responses (37 and 65% inhibition, respectively). Neutrophil infiltration also was reduced in the (+/-) and (-/-) mice (51 and 65% reduction, respectively). Topical administration of A192621 (500 microg/ear) in (+/+) mice inhibited AA-induced swelling (39%), whereas SB 234551 (500 microg/ear) was without effect. Collectively, these results implicate the ET(B) receptor in mediation of inflammatory pain and cutaneous inflammatory responses in mice.
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Authors | D E Griswold, S A Douglas, L D Martin, T G Davis, L Davis, Z Ao, M A Luttmann, M Pullen, P Nambi, D W Hay, E H Ohlstein |
Journal | Molecular pharmacology
(Mol Pharmacol)
Vol. 56
Issue 4
Pg. 807-12
(Oct 1999)
ISSN: 0026-895X [Print] United States |
PMID | 10496965
(Publication Type: Journal Article)
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Chemical References |
- A 192621
- Benzoquinones
- Dioxoles
- Endothelin Receptor Antagonists
- Pyrazoles
- Pyrrolidines
- Receptor, Endothelin B
- Receptors, Endothelin
- SB 234551
- Arachidonic Acid
- phenylbenzoquinone
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Topics |
- Animals
- Arachidonic Acid
(pharmacology)
- Benzoquinones
(pharmacology, therapeutic use)
- Blotting, Southern
- Dermatitis
(drug therapy, metabolism)
- Dioxoles
(pharmacology, therapeutic use)
- Endothelin Receptor Antagonists
- Genotype
- Hyperalgesia
(chemically induced, drug therapy)
- Mice
- Mice, Inbred BALB C
- Mice, Knockout
- Pain
(drug therapy, metabolism)
- Polymerase Chain Reaction
- Pyrazoles
(pharmacology, therapeutic use)
- Pyrrolidines
(pharmacology, therapeutic use)
- Receptor, Endothelin B
- Receptors, Endothelin
(genetics, metabolism)
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