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. 1985 Feb;84(2):393–406. doi: 10.1111/j.1476-5381.1985.tb12923.x

Nitroglycerine- and isoprenaline-induced vasodilatation: assessment from the actions of cyclic nucleotides.

T Itoh, Y Kanmura, H Kuriyama, T Sasaguri
PMCID: PMC1987288  PMID: 2983811

Abstract

To investigate the vasodilator actions of nitroglycerine and isoprenaline, the effects of these agents, dibutyryl cyclic AMP (db cyclic AMP) and 8-bromo cyclic GMP (8-Br cyclic GMP) on intact muscle tissue, and cyclic AMP and cyclic GMP on skinned muscle of the rabbit mesenteric artery were investigated. In porcine coronary artery, nitroglycerine (greater than 0.1 microM) increased the production of cyclic GMP with no change in the amount of cyclic AMP, while isoprenaline (greater than 0.1 microM) significantly increased the production of cyclic AMP with no change in the amount of cyclic GMP. In the rabbit mesenteric artery, nitroglycerine or isoprenaline inhibited the tonic component of the 39 mM [K]o-induced contraction to a greater extent than the phasic component. Nitroglycerine and 8-Br cyclic GMP showed a stronger inhibitory action on the K-induced contraction than did isoprenaline and db cyclic AMP. The sources of Ca utilized for the generation of contraction by noradrenaline and caffeine were estimated to be the same as those determined from the amplitudes of contractions evoked in Ca-free solution by various concentrations of noradrenaline or caffeine. In intact muscle tissues, the effects of nitroglycerine or 8-Br cyclic GMP on the amount of Ca stored in cells were estimated from the caffeine-induced contraction in Ca-free solution. Both agents inhibited the contractions due to a reduction in the amount of Ca in the cells. When the effects of isoprenaline or db cyclic AMP were observed, both agents inhibited the caffeine-induced contraction but the accumulation of Ca into cells was greater than the control. In saponin skinned muscles, the pCa-tension relationship in the presence of cyclic AMP and cyclic AMP-dependent protein kinase (cyclic AMP-PK) shifted to the right and to a lower level in comparison with the control. Applications of cyclic GMP with cyclic GMP-dependent protein kinase (cyclic GMP PK) also inhibited the contraction induced by low concentrations of Ca. In skinned muscles, cyclic AMP exhibited dual actions on Ca store sites, i.e. in the presence of high concentrations of Ca or prolonged superfusion of Ca, cyclic AMP reduced the amount of Ca due to activation of the Ca-induced Ca release mechanism by excess accumulation of Ca. On the other hand, cyclic GMP consistently inhibited the amplitude of the caffeine-induced contraction due to a reduction in the amount of Ca in the store sites.(ABSTRACT TRUNCATED AT 400 WORDS)

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Selected References

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