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Pancreatic Polypeptide Meal Response May Predict Gastric Band-Induced Weight Loss

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Abstract

Background

Unknown hormonal and neural satiety signals are thought to drive sustainable weight loss following laparoscopic adjustable gastric banding (LAGB). The objective of this study was to investigate whether the structurally related satiety hormones pancreatic polypeptide (PP) and peptide YY (PYY) influence total percentage weight loss after LAGB.

Methods

A cross-sectional study examined 17 postoperative individuals who had already achieved a mean of 28% LAGB-induced weight loss (range, 10–38%). A prospective study assessed plasma PP and PYY meal responses in 16 obese individuals prior to LAGB.

Results

In the cross-sectional study, individuals with higher weight loss had lower PP meal responses (2-h AUC, R = −0.60, p = 0.01) and lower fasting PYY levels (R = −0.55, p = 0.02). In the prospective study, subsequent mean weight loss was 20% (range, 5–50%) after a mean of 53 months. Low preoperative PP meal response (2-h AUC) predicted significantly higher subsequent weight loss after LAGB (R = −0.56, p = 0.024). The eight individuals with the lowest PP meal response lost more weight than the eight with the highest PP meal response (median 25% vs. 14%, p = 0.004). When compared across all three groups, mean PP meal responses did not differ. Fasting PYY levels, however, were significantly lower in the postoperative group compared to the group tested pre-operatively, or the BMI-matched controls (−30%, p = 0.03).

Conclusions

PYY appears reduced in proportion to weight loss following LAGB, possibly representing attempted orexigenic homeostatic compensation. Although PP responses appear unchanged by weight loss status, low PP meal response may predict higher weight loss. PP meal response may be a biological marker that could predict an individual's susceptibility to the mechanism underlying LAGB-induced weight loss.

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Notes

  1. Please note that for the comparison with BMI-matched controls, the 0900 PYY levels of the postoperative patients was the mean of the 0900 PYY levels measured on both testing occasions (‘optimal’ and ‘reduced’ restriction).

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Acknowledgements

We thank Dr. Belinda Drew for her assistance in performing the meal tests.

Funding and Potential Conflict of Interest Disclosures

The research was supported by Inamed Health, now owned by Allergan Inc., the manufacturer of the Lap-Band system, through an unrestricted research grant to Monash University. John Dixon is a Consultant for Allergan Inc. and receives research support funding. Andrew Dixon, Carel le Roux, Mohammed Ghatei, Stephen Bloom and Toni McGee have no conflicts of interest to declare.

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Authors and Affiliations

  1. Department of Radiology, Alfred Hospital, Commercial Road, Prahran, Melbourne, VIC, 3181, Australia

    Andrew F. R. Dixon

  2. Department of Investigative Medicine, Imperial College London, Hammersmith Hospital, Du Cane Road, London, 12 OHS, UK

    Carel W. le Roux, Mohammad A. Ghatei & Stephen R. Bloom

  3. Baker IDI Heart & Diabetes Institute, 75 Commercial Road, Melbourne, VIC, 8008, Australia

    Toni L. McGee & John B. Dixon

  4. Obesity Research Unit, School of Primary Health Care, Monash University, Building 1, 270 Ferntree Gully Road, Notting Hill, Melbourne, VIC, 3168, Australia

    John B. Dixon

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  1. Andrew F. R. Dixon
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Correspondence to John B. Dixon.

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Dixon, A.F.R., le Roux, C.W., Ghatei, M.A. et al. Pancreatic Polypeptide Meal Response May Predict Gastric Band-Induced Weight Loss. OBES SURG 21, 1906–1913 (2011). https://doi.org/10.1007/s11695-011-0469-z

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