Marked suppression of ghrelin concentration by insulin in Prader-Willi syndrome

Title
Marked suppression of ghrelin concentration by insulin in Prader-Willi syndrome
Authors
Lee, J.E.
Keywords
ghrelin, insulin, glucose clamp technique, hyperinsulinism
Issue Date
2007-04
Publisher
KOREAN ACAD MEDICAL SCIENCES
Abstract
The plasma ghrelin has been reported to be elevated in Prader-Willi syndrome (PWS) and modulated by insulin. It was hypothesized that insulin might have a more pronounced effect on reducing plasma ghrelin in PWS patients, which would influence appetite. This study investigated the degree of ghrelin suppression using an euglycemic hyperinsulinernic clamp in children with PWS (n=6) and normal children (n=6). After a 90-min infusion of insulin, the plasma ghrelin level decreased from a basal value of 0.86 +/- 0.15 to 0.58 +/- 0.12 ng/mL in the controls, and from 2.38 +/- 0.76 to 1.12 +/- 0.29 ng/mL in children with PWS (p=0.011). The area under the curve below the baseline level over the 90 min insulin infusion was larger in children with PWS than in controls (-92.82 +/- 44.4 vs. -10.41 +/- 2.87 ng/mL/90 min) (p=0.011). The insulin sensitivity measured as the glucose infusion rate at steady state was similar in the two groups (p=0.088). The decrease in the ghrelin levels in response to insulin was more pronounced in the children with PWS than in the controls. However, the level of ghrelin was always higher in the children with PWS during the clamp study. This suggests that even though insulin sensitivity to ghrelin is well maintained, an increase in the baseline ghrelin levels is characteristic of PWS.
URI
http://dspace.inha.ac.kr/handle/10505/1713
ISSN
1011-8934
Appears in Collections:
Medical School/College of Medicine (의학전문대학원/의과대학) > Medical Science (의학) > Journal Papers, Reports(의학 논문, 보고서)
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