Obesity Surgery

, Volume 22, Issue 5, pp 783–790 | Cite as

Association of Ghrelin Receptor Promoter Polymorphisms with Weight Loss Following Roux-en-Y Gastric Bypass Surgery

  • Michelle E. Matzko
  • George Argyropoulos
  • G. Craig Wood
  • Xin Chu
  • Roger J. M. McCarter
  • Christopher D. Still
  • Glenn S. Gerhard
Clinical Research

Abstract

Background

Ghrelin plays a role in appetite and has been hypothesized to play a role in the mechanism of Roux-en-Y gastric bypass (RYGB) surgery. Single nucleotide polymorphisms (SNPs) in the promoter region of its receptor gene (growth hormone secretagogue receptor type 1a—GHSR) have also been associated with weight loss outcomes following long-term dietary intervention in adults with impaired glucose tolerance. Our objectives were to evaluate changes in serum ghrelin levels and determine the effect of GHSR promoter polymorphisms on post-RYGB surgery weight loss.

Methods

Preoperative and 6-month postoperative serum ghrelin levels were measured in 37 patients with extreme obesity undergoing RYGB surgery. Total ghrelin was also measured in liver tissue collected intraoperatively. Association analysis between genotypes for SNPs rs9819506 and rs490683 in the promoter region of the GHSR gene and weight loss outcomes in the 30 months following surgery was performed in over 650 RYGB patients.

Results

Serum ghrelin levels increased after RYGB surgery. Weight loss trajectories were significantly different using an additive model for both ghrelin SNPs, with patients homozygous for the rs490683 CC genotype exhibiting the most weight loss. Weight loss trajectories were also different using a dominant model. The rs490683 risk allele demonstrated decreased promoter activity in vitro.

Conclusions

The role of increased ghrelin levels in weight loss outcomes following RYGB surgery may be influenced by variation in the GHSR gene.

Keywords

Ghrelin SNP RYGB Weight loss 

Supplementary material

11695_2012_631_MOESM1_ESM.doc (162 kb)
ESM 1(DOC 161 kb)

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Copyright information

© Springer Science+Business Media, LLC (outside the USA) 2012

Authors and Affiliations

  • Michelle E. Matzko
    • 1
    • 2
  • George Argyropoulos
    • 1
    • 3
  • G. Craig Wood
    • 1
    • 4
  • Xin Chu
    • 1
    • 3
  • Roger J. M. McCarter
    • 2
  • Christopher D. Still
    • 1
  • Glenn S. Gerhard
    • 1
    • 3
  1. 1.Obesity Institute, Geisinger ClinicDanvilleUSA
  2. 2.Department of Biobehavioral HealthThe Pennsylvania State UniversityUniversity ParkUSA
  3. 3.Weis Center for Research, Geisinger ClinicDanvilleUSA
  4. 4.Center for Health Research, Geisinger ClinicDanvilleUSA

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