OBJECTIVE 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 action...

INTRODUCTION In an animal model of acromegaly (PEPCK-hGH transgenic mice), low systemic levels of ghrelin have been observed compared with normal mice. We hypothesized that systemic circulating ghrelin levels are also decreased in humans with active acromegaly and that the contribution of central ghrelin production to systemic ghrelin levels is minimal. OBJECTIVES The aim of the present study...

this study was conducted to investigate the possible involvement of the histaminergic system in themediation of ghrelin-induced feeding behavior in broiler chickens. in the trial 1, the effect ofintracerebroventricular (icv) injection of ghrelin on feed intake was examined in 3-h feed-deprived broilerchickens. in the trials 2 and 3, the chickens were received icv chlorpheniramine (an h1 recepto...

a kind of growth hormone secretagogue (ghs), ghrelin, was first isolated from the rat stomach and plays a major role in the activation of the growth hormone secretagogue receptor 1a (ghs-r1a) resulting the release of growth hormone (gh). the preproghrelin gene is placed on chromosome 3, at locus 3p25 –2 in humans and constitutes five exons and three introns. ghrelin is most plentifully expresse...

Ghrelin, a 28-amino-acid peptide, has recently been isolated from the rat stomach as an endogenous ligand for the GH secretagogue receptor. We have reported previously that central or peripheral administration of ghrelin stimulates food intake, and the secretion of GH and gastric acid in rats. In the present study, we investigated how much endogenous centrally released ghrelin is involved in th...

Ghrelin, an endogenous ligand for the growth hormone secretagogue receptor, is produced predominantly in the stomach. It has been reported that endogenous ghrelin levels are increased by fasting and decreased immediately after feeding and that fasting-induced ghrelin release is controlled by the sympathetic nervous system. However, the mechanisms of plasma ghrelin decrement after feeding are po...

Whereas ghrelin is produced primarily in the stomach, a small amount of it is produced in pancreatic islets. Although exogenous administration of ghrelin suppresses insulin secretion in vitro or in vivo, the role of intraislet ghrelin in the regulation of insulin secretion in vivo remains unclear. To understand the physiological role of intraislet ghrelin in insulin secretion and glucose metabo...

A kind of growth hormone secretagogue (GHS), ghrelin, was first isolated from the rat stomach and plays a major role in the activation of the growth hormone secretagogue receptor 1a (GHS-R1a) resulting the release of growth hormone (GH). The preproghrelin gene is placed on chromosome 3, at locus 3p25 –2 in humans and constitutes five exons and three introns. Ghrelin is most plentifully expresse...