PMID: 2109858Mar 1, 1990Paper

Role of cholinergic, vagal reflexes on the bronchoconstrictor responses to histamine during carbon dioxide inhalation in conscious guinea-pigs

Pharmacological Research : the Official Journal of the Italian Pharmacological Society
R W Chapman, G Danko

Abstract

Histamine-induced bronchoconstriction in conscious guinea-pigs involves a cholinergic, bronchoconstrictor reflex, but the role of this reflex during elevated levels of inspired carbon dioxide is unknown. In this study we examined the role of cholinergic, vagal reflexes on the bronchoconstrictor responses to histamine during CO2 inhalation. Guinea-pigs were placed inside a whole body plethysmograph for measurement of tidal volume (VT), respiratory rate (f) and minute volume (V) and a head chamber was used to deliver a hypercapnic gas mixture (10% CO2, 21% O2, 69% N2) and for inhalation of aerosolized drugs. Inhalation of CO2 caused an increase in VT, f and V and these effects were reduced by exposure to aerosolized histamine (0.01-0.05% for 30 s). The histamine-induced reduction of VT was significantly (P less than 0.05) attenuated following a 60 s exposure to inhaled atropine (0.03 and 0.1%) as was the reduction of VT due to inhaled methacholine. Intravenous atropine (1 mg/kg) also blocked the VT reduction due to aerosolized histamine. Intravenous administration of the ganglionic blockers hexamethonium (1 mg/kg) and mecamylamine (10 mg/kg) did not inhibit the histamine-induced reduction of VT at doses of these drugs that reveal...Continue Reading

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