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Glucagon-like Peptide-2 Induces a Specific Pattern of Adaptation in Remnant Jejunum

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Abstract

Glucagon-like peptide-2 (GLP-2) is an enteroendocrine hormone which is uniquely trophic for the intestine; a physiological role in regulating nutrient absorptive capacity is becoming apparent. GLP-2, independent of enteral feeding, stimulates a classical pattern of intestinal adaptation in terminal ileum following resection. Herein we investigate the effects of GLP-2 on the jejunal remant using a rat model of short bowel syndrome (SBS). Juvenile 250- to 275-g SD rats underwent 80% distal small bowel resection, leaving 20 cm of proximal jejunum and venous catheterization. Animals were maintained with total parenteral nutrition (TPN) or TPN+10 μg/kg/hr GLP-2 (n=8 per group). After 7 days, intestinal permeability was assessed by urinary recovery of gavaged carbohydrate probes. Animals were euthanized, and the intestines taken for analysis of morphology, crypt cell proliferation, apoptosis, and expression of SGLT-1 and GLUT-5 transport proteins. GLP-2 treatment reduced intestinal permeability and increased in vivo glucose absorption, small intestinal weight, surface area, villus height, crypt depth, and microvillus height. Intestinal mucosal DNA and protein content per unit length of the small bowel were increased (P < 0.05 for all comparisons). However, in contrast to previous studies examining GLP-2’s effects on remnant ileum, the jejunal crypt apoptotic index was increased in GLP-2-treated animals, with no increase in SGLT-1 or GLUT 5 expression. These results show that exogenous GLP-2 treatment of animals with jejunal remnant reduces intestinal permeability, increases glucose absorption, and stimulates morphological features of intestinal adaptation including increased micovillus height and surface area. However, the pattern of changes seen is different from that in remnant ileum. This suggests that GLP-2’s effects are specific to different regions of the bowel. Nonetheless, remnant jejunum is responsive to GLP-2 in the absence of enteral nutrition. Further studies are warranted to establish the mechanisms of action and therapeutic potential of GLP-2 in modulating nutrient absorptive capacity.

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Acknowledgments

This study was supported by funding from the Alberta Children’s Hospital Research Foundation. We thank NPS Pharmaceuticals for provision of GLP-2 and performance of assays and Lidia Demchyshyn for support. Thanks are also due to Gail Wright-Wilson for secretarial support.

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Authors and Affiliations

  1. Gastrointestinal Research Group, University of Calgary, Calgary, Alberta, Canada

    D. L. Sigalet, O. Bawazir, G. R. Martin, L. E. Wallace, G. Zaharko, A. Miller & A. Zubaidi

  2. Alberta Children’s Hospital, 1820 Richmond Road SW, Calgary, Alberta, T2T 5C7, Canada

    D. L. Sigalet

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  1. D. L. Sigalet
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  2. O. Bawazir
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  6. A. Miller
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Correspondence to D. L. Sigalet.

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Sigalet, D.L., Bawazir, O., Martin, G.R. et al. Glucagon-like Peptide-2 Induces a Specific Pattern of Adaptation in Remnant Jejunum. Dig Dis Sci 51, 1557–1566 (2006). https://doi.org/10.1007/s10620-006-9077-5

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  • DOI: https://doi.org/10.1007/s10620-006-9077-5

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