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. 1994 Mar;111(3):769–776. doi: 10.1111/j.1476-5381.1994.tb14804.x

The effects of phorbol 12,13-diacetate on responses of guinea-pig isolated trachea to methylxanthines, isoprenaline and ryanodine.

J Cortijo 1, C M Sanz 1, V Villagrasa 1, E J Morcillo 1, R C Small 1
PMCID: PMC1910112  PMID: 8019755

Abstract

1. Using guinea-pig isolated trachea, we have studied how phorbol 12,13-diacetate (PDA) modulates mechanical responses of the tissue to methylxanthines, isoprenaline and ryanodine. 2. Caffeine (10 microM-5 mM), theophylline (10 microM-5 mM) and isoprenaline (1 nM-1 microM), each inhibited the spontaneous tone of the trachea. Pretreatment with PDA (0.1-10 microM) converted relaxant responses to high concentrations of the methylxanthines into contractions. PDA produced no equivalent effect against isoprenaline. Pretreatment with verapamil (1 or 10 microM), nifedipine (0.1 microM) or incubation with Ca(2+)-free, EGTA (0.1 mM)-containing physiological salt solution (PSS) suppressed the contraction produced by caffeine or theophylline in PDA (5 microM)-treated tissues. 3. The ability of PDA (5 microM) to convert caffeine-induced relaxation into caffeine-induced contraction was retained in tissues pretreated with a combination of atropine (1 microM) and mepyramine (1 microM) and in tissues denuded of the airway epithelium. 4. Caffeine (10 microM-5 mM), theophylline (10 microM-5 mM) and isoprenaline (1 nM-1 microM), each relaxed trachea contracted with histamine (0.1 mM). The relaxation induced by caffeine, theophylline and isoprenaline was markedly reduced in the presence of PDA (5 microM) and the responses to high concentrations of caffeine and theophylline, but not those to isoprenaline, were reversed to contractions. Verapamil (10 microM) prevented the effects of PDA against caffeine- or theophylline-induced relaxation. 5. PDA (1 microM) enhanced the tracheal spasm produced by caffeine (10 mM) and theophylline (10 mM) in indomethacin (2.8 microM)-treated trachea maintained at 20 degrees C. This enhancement was reduced in the presence of verapamil (10 microM).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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