Ghrelin (Ghr) is a 28-amino acid peptide identified as endogenous, acylated ligand for the growth hormone (GH) secretagogue G-protein-coupled receptor (GHSR). Mainly synthesized from X/A like neuroendocrin cells of gastric fundus, Ghr acts directly on the pituitary gland inducing GH release; moreover Ghr regulates food intake resulting tightly associated with obesity. Several studies reported that Ghr is widely expressed in different tissues and, besides its orexigenic activity, effects on cardiovascular, pulmonary, reproductive and central nervous systems have been described. Recently, functional studies on rats and rabbits indicated Ghr as modulator of iris smooth muscles activity since induces relaxation of both sphincter and dilator muscles. Moreover Ghr mRNA has been found in the ciliary epithelium of ciliar body (CB). On the basis of these observations, we purposed to investigate Ghr and GHSR expression in human eye. The immunohistochemical analysis performed on iris and cilia...
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