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. 1991 May;103(1):1119–1125. doi: 10.1111/j.1476-5381.1991.tb12310.x

Lack of effect of zaprinast on methacholine-induced contraction and inositol 1,4,5-trisphosphate accumulation in bovine tracheal smooth muscle.

E R Chilvers 1, M A Giembycz 1, R A Challiss 1, B J Barnes 1, S R Nahorski 1
PMCID: PMC1908075  PMID: 1652339

Abstract

1. The effects of zaprinast (M&B 22948), a selective guanosine 3':5'-cyclic monophosphate (cyclic GMP) phosphodiesterase inhibitor, and sodium nitroprusside on cyclic GMP content, phosphoinositide hydrolysis and airway smooth muscle tone were examined in flurbiprofen pretreated bovine tracheal smooth muscle (BTSM). 2. Anion-exchange chromatography of the soluble fraction of BTSM homogenates resolved three peaks of Ca2+/calmodulin-independent phosphodiesterase (PDE) activity that corresponded to type Ia (cyclic GMP-specific, zaprinast-inhibitable), type II (cyclic GMP-stimulated) and type IV (Ro 20 1724-inhibitable) PDE isoenzymes. Zaprinast caused a selective inhibition of the type Ia PDE isoenzyme (IC50 0.94 microM) with respect to the type II and IV (IC50 s 93 microM and 197 microM respectively) isoenzymes. 3. Pretreatment of BTSM strips with zaprinast (10 microM) for 20 min affected neither the initial rate of force development, nor the resultant magnitude of contraction induced by methacholine (10 microM). In addition, zaprinast (10 microM; 20 min) did not affect the cumulative concentration-response relationship induced by methacholine. In contrast, sodium nitroprusside (300 microM) either alone, or in combination with zaprinast (10 microM), significantly attenuated tone induced by low, but not high concentrations of methacholine. This resulted in a non-parallel, rightwards shift of the methacholine concentration-response curves (nitroprusside: 4.0 fold; nitroprusside/zaprinast: 4.8 fold at the EC50 values), without a reduction in the maximum tone generated. 4. In BTSM slices, zaprinast (10 or 100 microM) did not influence basal or methacholine (10 microM)-stimulated cyclic GMP accumulation or inositol 1,4,5-trisphosphate (Ins(1,4,5)P3) mass accumulation over a 60s incubation period, although it did significantly increase cyclic GMP content over longer (30 min) stimulation periods.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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