Summary
Just as cAMP is regarded as an intracellular mediator of histamine, so has cGMP been connected with cholinergic stimulation of gastric acid secretion. The object of the present investigation was to study the possible role of cellular cGMP on 14C-aminopyrine uptake, an indirect measure of parietal cell H+-production, by using mixtures of isolated rat gastric cells and fractions with different parietal cell content.
Cellular cAMP and cGMP. The phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine (IBMX) enhanced the cAMP and cGMP of gastric cells in a time- and concentration-dependent manner, by 98 and 124% (1 mmol/l) and was included in all further studies. In parietal cell enriched fractions, histamine elevated cAMP by 109% (100 μmol/l) without changing cGMP while carbachol did not influence either nucleotide. Various thiols and nitrogen compounds strongly enhanced cellular cGMP, e. g. hydroxylamine and l-cysteine (1 mmol/l) by 527 and 656%, whereas changes in cAMP were minimal. The hydroxylamine response occurred in parietal cell depleted and enriched fractions.
14 C-aminopyrine (AP) uptake. IBMX alone reduced the basal AP uptake, potentiated the effect of histamine and inhibited the effect of carbachol, which alone stimulated basal accumulation by 302%. The most efficacious stimulant of parietal cell H+-production was dibutyryl cAMP (582%, 100 μmol/l), whereas dibutyryl cGMP was without effect. However, this latter compound (1 mmol/l) reduced AP accumulation due to dibutyryl cAMP almost completely. Thiols and nitrogen compounds all more or less reduced AP uptake.
The data contraindicate the theory of a second messenger function for cGMP in cholinergic acid stimulation of the rat stomach. They show, that an increase in cGMP is associated with low H+-production, even if cAMP levels are raised above their resting state. Thus, the results suggest that cGMP rather mediates inhibition of acid secretion, possibly by counteracting the messenger function of cAMP.
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This study was supported by the Deutsche Forschungsgemeinschaft
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Heim, HK., Ruoff, HJ. Cyclic GMP and acid production in isolated gastric cells of the rat. Naunyn-Schmiedeberg's Arch. Pharmacol. 330, 147–154 (1985). https://doi.org/10.1007/BF00499908
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DOI: https://doi.org/10.1007/BF00499908