Abstract:
:1. The current study investigated the effects of respiratory tract viral infection on the density of ETA and ETB receptors in murine tracheal smooth muscle and on the contractile response to endothelin-1 mediated by these receptors. 2. Quantitative autoradiographic studies using [125I]-endothelin-1 revealed that tracheal smooth muscle from control mice contained ETA and ETB receptors in the ratio of 42%:58% (+/- 4%, n = 10 mice), respectively. In contrast, tracheal smooth muscle obtained from mice 2 days post-inoculation with Influenza A/PR-8/34 virus contained 23 +/- 2% fewer receptors for [125I]-endothelin-1 (n = 10, P < 0.01). This reflected a selective reduction in ETB receptor density and a change in the ratio of ETA and ETB receptors to 77%:23% (+/- 5%, n = 10 mice), respectively. 3. The ETB receptor-selective agonist, sarafotoxin S6c, was a potent spasmogen of murine isolated tracheal smooth muscle and the EC50 for contraction was similar in preparations from control (3.6 nM [95% confidence limits, 2.7-4.8 nM], n = 16 preparations from 8 mice) and virus-inoculated mice (3.0 nM [2.4-3.7 nM], n = 16 preparations from 8 mice). However, the maximum contractions induced by sarafotoxin S6c (100 nM) in the preparations from virus-inoculated mice (37 +/- 5% Cmax, where 100% Cmax was the response to 10 microM carbachol) were significantly smaller than those from control mice (85 +/- 4% Cmax, P < 0.01). 4. Contractions induced by endothelin-1 in tracheal smooth muscle preparations obtained from virus inoculated mice (EC50 for contraction, 6.5 nM [95% confidence limits, 2.7-16 nM]; maximum contraction,112 +/- 5% Cm.; n = 4) were similar to those induced by endothelin-1 in control preparations (ECm9.3 nM (4.2-21); maximum contraction, 110 +/- 3% Cmax; n = 4). Endothelin-1-induced contractions in control preparations were only marginally inhibited by the ETA receptor-selective antagonist BQ-123 (in the presence of 3 micro M BQ-123; EC50 for contraction, 5.9 nM [4.1-8.5]; maximum contraction, 82 +/- 4%Cmax; n = 4). In contrast, 3 microM BQ-123 caused a 50 fold rightward shift (17-160, n =4) of the concentration-effect curve to endothlin-1 in preparations obtained from virus-inoculated mice (measured at the 30% Cmax level of contraction).5. Tracheal smooth muscle preparations exposed to 100 nM sarafotoxin S6c for 30 min (followed by a 30 min washout period) did not contract to subsequently administered sarafotoxin S6c (1-100 nM;n = 8), but contracted normally in response to endothelin-1 (EC50 6.5 nM (2.3-18); maximum contraction,109 +/- 2% Cmax; n = 4). Endothelin-l-induced contractions in these ETB receptor desensitized preparations were markedly inhibited by 3 microM BQ-123, irrespective of whether the preparations were obtained from control (63 fold shift (10-400) at the 30% Cma. level of contraction, n = 4) or virus inoculated mice (46 fold shift (18-120), n = 4).6. In summary, tracheal smooth muscle obtained from mice infected with a respiratory tract virus,Influenza A/PR-8/34 had a reduced density of ETB receptors and an attenuated ETB receptor-mediated contractile response to sarafotoxin S6c and endothelin-1. Virus-inoculation was also associated with a modest increase in tracheal smooth muscle ETA receptor density, although no significant change in ETA receptor-mediated contractile activity was seen. Thus, virus infection in murine airways produced profound alterations in endothelin receptor density, some of which were associated with changes in receptor-mediated contractile activity.
journal_name
Br J Pharmacoljournal_title
British journal of pharmacologyauthors
Henry PJ,Goldie RGdoi
10.1111/j.1476-5381.1994.tb13209.xsubject
Has Abstractpub_date
1994-08-01 00:00:00pages
1188-94issue
4eissn
0007-1188issn
1476-5381journal_volume
112pub_type
杂志文章abstract::This article discusses the background to the need for change in the reporting of experiments involving animals, including a report of a consensus meeting organised by the Basel Declaration Society and Understanding Animal Research UK that sought to Internationalise guidelines for reporting experiments involving animal...
journal_title:British journal of pharmacology
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doi:10.1038/sj.bjp.0701461
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journal_title:British journal of pharmacology
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abstract::(1) UNC-49B and UNC-49C are gamma-aminobutyric acid (GABA) receptor subunits encoded by the Caenorhabditis elegans unc-49 gene. UNC-49B forms a homomeric GABA receptor, or can co-assemble with UNC-49C to form a heteromeric receptor. The pharmacological properties of UNC-49B homomers and UNC-49B/C heteromers were inves...
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journal_title:British journal of pharmacology
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