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Ghrelin is the recently identified endogenous ligand for the ghrelin receptor GHS-R1a and known to regulate growth hormone secretion and appetite. Ghrelin also is a potent vasodilator and improves cardiac performance after systemic administration. Generally, the octanoyl modification on Ser3 has been considered essential for biological activity. Recently however, cardiovascular actions of des-octanoyl ghrelin have been reported in rodents. Our aim was to investigate if ghrelin and ghrelin receptor protein are expressed within the human vasculature, to determine if des-octanoyl ghrelin, like ghrelin, is a vasodilator in human artery and to test the acute effect of ghrelin peptides on cardiac contractility.

Functional and immunocytochemical evidence for a role of ghrelin and des-octanoyl ghrelin in the regulation of vascular tone in man