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Article: Lowering PO2 induces epithelium-dependent relaxation in isolated canine bronchi
Title | Lowering PO2 induces epithelium-dependent relaxation in isolated canine bronchi |
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Authors | |
Keywords | Airway Tone Epithelium-Dependent Relaxing Factor Indomethacin Methylene Blue Propranolol Tetrodotoxin |
Issue Date | 1989 |
Publisher | American Physiological Society. The Journal's web site is located at http://ajpcon.physiology.org/ |
Citation | American Journal Of Physiology - Cell Physiology, 1989, v. 257 n. 5, p. 26/5 How to Cite? |
Abstract | This study was designed to investigate whether the respiratory epithelium can modulate the tone of the underlying smooth muscle in response to decreases in partial pressure of O2 (PO2). Canine bronchial segments with or without epithelium (diameter, 4-6 mm; length, 50-60 mm) were mounted in organ chambers and perfused intraluminally with modified Krebs-Ringer bicarbonate solution [temperature, 37°C; PO2 varying from 600 (control) to 40 mmHg; PCO2, 36 mmHg]. Isometric tension was recorded by means of stirrups passed through the wall of the central part of the bronchial segment. During contractions to carbachol, the tissues with epithelium showed epithelium-dependent relaxations when the PO2 was decreased. The level of relaxation was dependent on the PO2. The epithelium-dependent relaxation could not be blocked by the following agents: indomethacin, methylene blue, propranolol, or tetrodotoxin (antagonists or blockers of cyclooxygenase, guanylate cyclase, β-adrenoceptors, and sodium channels, respectively). The epithelium-dependent relaxation was not accompanied by the release of an assayable relaxing factor in the bronchial lumen. The experiments suggest that 1) lowering the PO2 induces the epithelium to release a relaxing factor(s), which is neither a product of cyclooxygenase nor endothelium-derived relaxing factor; 2) a local reflex mechanism is not involved in the phenomenon; and 3) the relaxing factor(s) either is not released into the bronchial lumen or, if it is, is catalyzed rapidly in the lumen on release. |
Persistent Identifier | http://hdl.handle.net/10722/170918 |
ISSN |
DC Field | Value | Language |
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dc.contributor.author | Gao, Y | en_US |
dc.contributor.author | Vanhoutte, PM | en_US |
dc.date.accessioned | 2012-10-30T06:11:25Z | - |
dc.date.available | 2012-10-30T06:11:25Z | - |
dc.date.issued | 1989 | en_US |
dc.identifier.citation | American Journal Of Physiology - Cell Physiology, 1989, v. 257 n. 5, p. 26/5 | en_US |
dc.identifier.issn | 0002-9513 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/170918 | - |
dc.description.abstract | This study was designed to investigate whether the respiratory epithelium can modulate the tone of the underlying smooth muscle in response to decreases in partial pressure of O2 (PO2). Canine bronchial segments with or without epithelium (diameter, 4-6 mm; length, 50-60 mm) were mounted in organ chambers and perfused intraluminally with modified Krebs-Ringer bicarbonate solution [temperature, 37°C; PO2 varying from 600 (control) to 40 mmHg; PCO2, 36 mmHg]. Isometric tension was recorded by means of stirrups passed through the wall of the central part of the bronchial segment. During contractions to carbachol, the tissues with epithelium showed epithelium-dependent relaxations when the PO2 was decreased. The level of relaxation was dependent on the PO2. The epithelium-dependent relaxation could not be blocked by the following agents: indomethacin, methylene blue, propranolol, or tetrodotoxin (antagonists or blockers of cyclooxygenase, guanylate cyclase, β-adrenoceptors, and sodium channels, respectively). The epithelium-dependent relaxation was not accompanied by the release of an assayable relaxing factor in the bronchial lumen. The experiments suggest that 1) lowering the PO2 induces the epithelium to release a relaxing factor(s), which is neither a product of cyclooxygenase nor endothelium-derived relaxing factor; 2) a local reflex mechanism is not involved in the phenomenon; and 3) the relaxing factor(s) either is not released into the bronchial lumen or, if it is, is catalyzed rapidly in the lumen on release. | en_US |
dc.language | eng | en_US |
dc.publisher | American Physiological Society. The Journal's web site is located at http://ajpcon.physiology.org/ | en_US |
dc.relation.ispartof | American Journal of Physiology - Cell Physiology | en_US |
dc.subject | Airway Tone | en_US |
dc.subject | Epithelium-Dependent Relaxing Factor | en_US |
dc.subject | Indomethacin | en_US |
dc.subject | Methylene Blue | en_US |
dc.subject | Propranolol | en_US |
dc.subject | Tetrodotoxin | en_US |
dc.title | Lowering PO2 induces epithelium-dependent relaxation in isolated canine bronchi | en_US |
dc.type | Article | en_US |
dc.identifier.email | Vanhoutte, PM:vanhoutt@hku.hk | en_US |
dc.identifier.authority | Vanhoutte, PM=rp00238 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.scopus | eid_2-s2.0-0024346832 | en_US |
dc.identifier.volume | 257 | en_US |
dc.identifier.issue | 5 | en_US |
dc.identifier.spage | 26/5 | en_US |
dc.publisher.place | United States | en_US |
dc.identifier.scopusauthorid | Gao, Y=7404706442 | en_US |
dc.identifier.scopusauthorid | Vanhoutte, PM=7202304247 | en_US |
dc.identifier.issnl | 0002-9513 | - |