Structure of Ghrelin and Its Receptor
Ghrelin is synthesized as a preprohormone, then proteolytically processed to yield a 28-amino acid peptide. An interesting and unique modification is imposed on the hormone during synthesis in the form of an n-octanoic acid bound to one of its amino acids; this modification is necessary for biologic activity.
The predominant source of circulating ghrelin is the gastrointestinal tract, primarily from the stomach, but also in smaller amounts from the intestine. The hypothalamus in the brain is another significant source of ghrelin; smaller amounts are produced in the placenta, kidney, and pituitary gland.
The ghrelin receptor was known well before ghrelin was discovered. Cells within the anterior pituitary bear a receptor that, when activated, potently stimulates secretion of growth hormone - that receptor was named the growth hormone secretagoue receptor (GHS-R). The natural ligand for the GHS-R was announced in 1999 as ghrelin, and ghrelin was named for its ability to provoke growth hormone secretion (the suffix ghre means "grow").
Ghrelin's activity in modulating feeding behavior and energy balance are best explained by the presence of ghrelin receptors in areas of the hypothalamus long known to be involved in appetite regulation. Receptors are also found concentrated in other areas of the brain, including the hippocampus and regions known to be involved in reward systems (e.g. tegmental area); indeed, ghrelin appears to activate some of the same circuits that are involved in drug reward, which may also be related to this hormone's effects on appetite.
Physiologic Effects of Ghrelin and Control of Secretion
At least two major biologic activites have been ascribed to ghrelin:
Other effects of ghrelin include stimulating gastric emptying and having a variety of positive effects on cardiovascular function (e.g. increased cardiac output). It is not totally clear whether the cardiovascular effects are a direct effect of ghrelin or represent an indirect effect of ghrelin's ability to stimulate growth hormone secretion.
Blood concentrations of ghrelin are lowest shortly after consumption of a meal, then rise during the fast just prior to the next meal. The figure to the right shows this pattern based on assays of plasma ghrelin in 10 humans during the course of a day.
Given the effects of ghrelin on energy metabolism and hunger, it is a prominent target for development of anti-obesity treatments. It has been reported that immunization of rats against ghrelin resulted in decreased weight gain and adiposity relative control rats, even though both groups consumed an equivalent amount of food. This intriguing experiment suggests the possibility of a vaccine against obesity.
Control of ghrelin secretion remains poorly understood. Other hormones that influence it's secretion include estrogen and leptin, but a comprehensive understanding of, for example, short term control of secretion from the stomach, is lacking.
Ghrelin concentrations in blood are reduced in obese humans compared to lean control subjects, but whether this is cause or effect is not defined. Patients with anorexia nervosa have higher than normal plasma ghrelin levels, which decrease if weight gain occurs.
Prader-Willi syndrome is another disorder relevant to ghrelin science. Affected patients develop extreme obesity associated with uncontrollable and voracious appetite. The plasma ghrelin levels are exceptionally high in comparison to patients similarly obese due to other causes. Prader-Willi syndrome is clearly a complex disease with many defects; it may be that excessive ghrelin production contributes to the appetite and obesity components.
|Index of: Gastrointestinal Hormones|
Last updated on October 11, 2009
|Author: R. Bowen|
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