Effects of Capsaicin, (±)-CP-96,345 and SR 48968 on the Bradykinin-induced Airways Microvascular Leakage in Guinea-pigs
| Autor: | Y. Qian, X. Emonds-Alt, Charles Advenier |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Pulmonary and Respiratory Medicine
medicine.medical_specialty Neurokinin A Guinea Pigs Bradykinin Vascular permeability Substance P In Vitro Techniques Autonomic Nervous System Capillary Permeability chemistry.chemical_compound Piperidines Internal medicine medicine Animals Hypnotics and Sedatives Pharmacology (medical) General Pharmacology Toxicology and Pharmaceutics Evans Blue Nerve Endings Biphenyl Compounds Receptors Neurokinin-2 Extravasation Receptors Neurotransmitter Biphenyl compound Endocrinology chemistry Capsaicin Benzamides |
| Zdroj: | Pulmonary Pharmacology. 6:63-67 |
| ISSN: | 0952-0600 |
| DOI: | 10.1006/pulp.1993.1009 |
| Popis: | The aim of this study was to demonstrate the involvement of neuropeptides in the increase in microvascular permeability induced by bradykinin in guinea-pig airways in vivo and to determine the type of receptor involved. Extravasation of intravenously injected Evans blue dye was used as an index of vascular permeability. Increase in plasma exudation induced by bradykinin (0.3 micrograms/kg, iv) was reduced or abolished by capsaicin (40 mg/kg, sc, 7 days before experiments), a drug which destroys neurokinins in the NANC nerve endings. (+/-)-CP-96,345 (3 mg/kg, iv), an antagonist of neurokinin NK1-receptors, abolished the increase of vascular permeability induced by bradykinin and reduced or abolished the effects of substance P (0.3 micrograms/kg, iv). The higher dose of (+/-)-CP-96,345 (10 mg/kg, iv) completely blocked the effects of substance P, but it did not modify those of neurokinin A (100 micrograms/kg, iv). In contrast, SR 48968 (0.1 and 0.3 mg/kg, iv), an antagonist of neurokinin NK2-receptors, reduced the increase of vascular permeability induced by neurokinin A without influencing the effects of bradykinin and substance P. These results demonstrate that a stimulation of the non-adrenergic non-cholinergic (NANC) nerves and a subsequent release of neuropeptides, especially of substance P, is involved in the effects of bradykinin. |
| Databáze: | OpenAIRE |
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