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. 1993 Nov;110(3):1117–1125. doi: 10.1111/j.1476-5381.1993.tb13930.x

Effects of a water-soluble forskolin derivative (NKH477) and a membrane-permeable cyclic AMP analogue on noradrenaline-induced Ca2+ mobilization in smooth muscle of rabbit mesenteric artery.

S Ito 1, S Suzuki 1, T Itoh 1
PMCID: PMC2175778  PMID: 8298800

Abstract

1. Effects were studied of 6-(3-dimethylaminopropionyl) forskolin (NKH477), a water-soluble forskolin derivative and of dibutyryl-cyclic AMP, a membrane-permeable cyclic AMP analogue on noradrenaline (NA)-induced Ca2+ mobilization in smooth muscle strips of the rabbit mesenteric artery. The intracellular concentration of Ca2+ ([Ca2+]i), isometric force and cellular concentration of inositol 1,4,5-trisphosphate (InsP3) were measured. 2. NA (10 microM) produced a phasic, followed by a tonic increase in both [Ca2+]i and force in a solution containing 2.6 mM Ca2+. NKH477 (0.01-0.3 microM) attenuated the phasic and the tonic increases in both [Ca2+]i and force induced by 10 microM NA, in a concentration-dependent manner. 3. In Ca(2+)-free solution containing 2 mM EGTA with 5.9 mM K+, NA (10 microM) produced only phasic increases in [Ca2+]i and force. NKH477 (0.01 microM) and dibutyryl-cyclic AMP (0.1 mM) each greatly inhibited these increases. 4. NA (10 microM) led to the production of InsP3 in intact smooth muscle strips and InsP3 (10 microM) increased Ca2+ in Ca(2+)-free solution after a brief application of Ca2+ in beta-escin-skinned smooth muscle strips. NKH477 (0.01 microM) or dibutyryl-cyclic AMP (0.1 mM) modified neither the NA-induced synthesis of InsP3 in intact muscle strips nor the InsP3-induced Ca2+ release in skinned strips. 5. In Ca(2+)-free solution, high K+ (40 and 128 mM) itself failed to increase [Ca2+]i but concentration-dependently enhanced the amplitude of the increase in [Ca2+]i induced by 10 microM NA with a parallel enhancement of the maximum rate of rise.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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