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Pharmacological modulation of inhaled sodium metabisulphite-induced airway microvascular leakage and bronchoconstriction in the guinea-pig.

Abstract：

:1. We have investigated the effects of chlorpheniramine, atropine and capsaicin pretreatment on inhaled sodium metabisulphite (MBS)-induced airway microvascular leakage and bronchoconstriction in anaesthetized guinea-pigs in order to clarify the mechanisms involved in these responses. The effects of frusemide and nedocromil sodium were also examined. 2. Lung resistance (RL) was measured for 6 min after inhalation of MBS (20, 40, 80 and 200 mM; 30 breaths), followed by measurement of extravasation of Evans blue dye into airway tissues, used as an index of airway microvascular leakage. MBS caused an increase in RL and leakage of dye at all airway levels in a dose-dependent manner. 3. Chlorpheniramine (10 mg kg-1, i.v.), atropine (1 mg kg-1, i.v.), their combination or inhaled nedocromil sodium (10 mg ml-1, 7 min) had no effect against the airway microvascular leakage induced by 80 mM MBS (30 breaths). Capsaicin pretreatment (50 mg kg-1, s.c.) caused a significant decrease in the leakage of dye in the main bronchi and inhaled frusemide (10 mg ml-1, 7 min) also in the main bronchi and proximal intrapulmonary airway. 4. Chlorpheniramine, atropine, their combination, capsaicin pretreatment and frusemide, but not nedocromil sodium, inhibited significantly the peak RL induced by 80 mM MBS (30 breaths) by approximately 50%. 5. We conclude that a cholinergic reflex and neuropeptides released from sensory nerve endings may participate in the mechanisms of MBS-induced airway responses. Frusemide but not nedocromil sodium may have an inhibitor effect on these neural mechanisms. The inhibitory effect of nedocromil sodium against lower doses of MBS is not excluded.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Sakamoto T,Elwood W,Barnes PJ,Chung KF

doi

10.1111/j.1476-5381.1992.tb12771.x

subject

Has Abstract

pub_date

1992-10-01 00:00:00

pages

481-7

issue

2

eissn

0007-1188

issn

1476-5381

journal_volume

107

pub_type

杂志文章

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