SA Ebrahimi Razi Institute for Drug Researches, Iran University of Medical Sciences, Shaheed Hemmat express way Tehran, Iran

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M-R Zareie Department of Biology, Faculty of Sciences, Teacher Training University Tehran, Iran

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P. Rostami Department of Biology, Faculty of Sciences, Teacher Training University Tehran, Iran

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M Mahmoudian Massoud Mahmoudian Department of Pharmacology, Iran University of Medical Sciences P.O. Box 14155-6183, Tehran, Iran

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Angiotensin Converting Enzyme Inhibitors (ACEI) like captopril and enalapril, can induce persistant cough in man. Noscapine, an antitussive alkaloid, can be used to suppress ACEI-induced cough. Some workers have suggested a role for bradykinin in precipitation of ACE-induced cough. Work carried out in our laboratory has shown noscapine to be a non-competitive inhibitor of bradykinin in guinea pig ileum. It is therefore possible that noscapine suppresses cough by blocking the effect of bradykinin receptor activation in the airways. Guinea pigs were placed in a cough-chamber connected to an air pump and a pressure transducer. Capsaicin was sprayed into the chamber and cough was recorded as a distinctive change in air pressure inside the cough-chamber. Animals treated with 1 mg/kg captopril and enalapril for 7 days, showed increased cough response. Ten µg/kg FR190997, a non-peptide agonist of the bradykinin B2 receptor, also increased the cough response. Noscapine at 0.5, 1 and 2 mg/kg was able to reverse the effects of ACEI and FR190997. Naloxone, a specific opioid receptor inhibitor, did not block the antitussive effects of noscapine in enalapril or FR190997 treated guinea pigs. This antitussive effect of noscapine is not mediated via the µ, κ or δ opioid receptors. It is therefore possible that noscapine exerts its antitussive action by interfering with the bradykinin cough mediation.

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Editor(s)-in-Chief: Rosivall, László

Honorary Editor(s)-in-Chief): Monos, Emil

Managing Editor(s): Bartha, Jenő; Berhidi, Anna

Co-editor(s): Koller, Ákos; Lénárd, László; Szénási, Gábor

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Acta Physiologica Hungarica
Language English
Year of
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Founder Magyar Tudományos Akadémia
H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Chief Executive Officer, Akadémiai Kiadó
ISSN 0231-424X (Print)
ISSN 1588-2683 (Online)

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