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. 1992 Apr;105(4):954–958. doi: 10.1111/j.1476-5381.1992.tb09084.x

Correlation between airway epithelium-induced relaxation of rat aorta in the co-axial bioassay and cyclic nucleotide levels.

D W Hay 1, R M Muccitelli 1, C P Page 1, D Spina 1
PMCID: PMC1908717  PMID: 1324058

Abstract

1. In co-axial bioassays, in the presence of indomethacin, addition of histamine (100 microM) or methacholine (100 microM) to guinea-pig trachea produced an epithelium-dependent relaxation of precontracted rat aorta which was associated with an approximately 2 fold elevation in tissue levels of guanosine 3':5'-cyclic monophosphate (cyclic GMP). Removal of the airway epithelium abolished the histamine-induced relaxation of rat aorta and the associated increase in intracellular cyclic GMP. 2. Epithelium-dependent relaxation was not associated with altered adenosine 3':5'-cyclic monophosphate (cyclic AMP) levels in rat aorta. Unstimulated intact or denuded guinea-pig trachea also did not affect the levels of cyclic AMP or cyclic GMP in rat aorta. 3. Methylene blue (10 microM) abolished the methacholine-induced, endothelium-derived relaxing factor (EDRF)-mediated rise in intracellular cyclic GMP in rat endothelium-intact aorta alone. In contrast, methylene blue (10 microM) did not affect the methacholine-induced epithelium-dependent rise in intracellular cyclic GMP in rat endothelium-denuded aorta in the co-axial bioassay. 4. Relaxation of the rat aorta without endothelium was associated with increased levels of cyclic GMP (but not cyclic AMP) in response to sodium nitroprusside (5 nM) and of cyclic AMP (but not cyclic GMP) in response to isoprenaline (1 microM). 5. These results provide evidence that the postulated epithelium-derived inhibitory factor (EpDIF) may produce relaxation of vascular tissue via elevation in cyclic GMP levels. Furthermore, some data suggest that EpDIF may act by stimulation of the particulate, rather than the soluble form of guanylate cyclase.

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Selected References

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