title: Marked suppression of ghrelin concentration by insulin in Prader-willi syndrome.
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 hyperinsulinemic 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.
authors: Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors: Kyung-Hoon
authors: KH
authors: Paik
authors: Moon-Kyu
authors: MK
authors: Lee
authors: Dong-Kyu
authors: DK
authors: Jin
authors: Hahn Wook
authors: HW
authors: Kang
authors: Kyung Han
authors: KH
authors: Lee
authors: An Hee
authors: AH
authors: Kim
authors: Cheol
authors: C
authors: Kim
authors: Ji Eun
authors: JE
authors: Lee
authors: Yoo Joung
authors: YJ
authors: Oh
authors: Seonwoo
authors: S
authors: Kim
authors: Sun Joo
authors: SJ
authors: Han
authors: Eun Kyung
authors: EK
authors: Kwon
authors: Yon Ho
authors: YH
authors: Choe
mesh_terms: D000293:Adolescent; D002648:Child; D015536:Down-Regulation / Q000187:drug effects; D005260:Female; D054439:Ghrelin; D006801:Humans; D007262:Infusions, Intravenous; D007328:Insulin / Q000008:administration & dosage* / Q000097:blood; D008297:Male; D008657:Metabolic Clearance Rate / Q000187:drug effects; D036361:Peptide Hormones / Q000097:blood* / Q000187:drug effects*; D011218:Prader-Willi Syndrome / Q000097:blood*
chemical_list: D054439:Ghrelin; D007328:Insulin; D036361:Peptide Hormones