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The identification of apparently novel cyclic AMP and cyclic GMP phosphodiesterase activities in guinea-pig tracheal smooth muscle

Burns, F and Stevens, P A and Pyne, N J (1994) The identification of apparently novel cyclic AMP and cyclic GMP phosphodiesterase activities in guinea-pig tracheal smooth muscle. British Journal of Pharmacology, 113 (1). pp. 3-4. ISSN 0007-1188

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Abstract

Phosphodiesterase (PDE) activities that were capable of hydrolysing cyclic AMP (Km = 6.8 +/- 2 microM) and cyclic GMP (Km = 6.7 +/- 1.6 microM) were isolated from tracheal smooth muscle. These enzyme(s) activities were insensitive to stimulation by calcium/calmodulin and to inhibition by cyclic GMP, rolipram (type IV inhibitor) and siguazodan (type III inhibitor). Zaprinast was a relatively poor inhibitor of both cyclic AMP and cyclic GMP hydrolysis (IC50 = 46 +/- 9 microM and 45 +/- 14 microM respectively). These results suggest that tracheal smooth muscle may contain an apparently novel PDE. However, KCl (30 mM) which facilitates calcium entry in cells, depressed bradykinin-stimulated intracellular cyclic AMP formation, suggesting that the type I PDE may be functionally present. We suggest that considerable caution be exercised in identifying apparently novel PDE isoforms.

Item type: Article
ID code: 34922
Keywords: 3',5'-cyclic-AMP phosphodiesterases, 3',5'-cyclic-GMP phosphodiesterases, animals, bradykinin, guinea pigs, isoenzymes, muscle, smooth, potassium chloride, trachea, Pharmacy and materia medica, Pharmacology
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
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    Depositing user: Pure Administrator
    Date Deposited: 15 Nov 2011 05:18
    Last modified: 05 Sep 2014 12:33
    URI: http://strathprints.strath.ac.uk/id/eprint/34922

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