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GLP-1R Agonists Modulate Enteric Immune Responses Through the Intestinal Intraepithelial Lymphocyte GLP-1R.

Bernardo Yusta1, Laurie L Baggio1, Jacqueline Koehler1

  • 1Department of Medicine, Mount Sinai Hospital, Lunenfeld-Tanenbaum Research Institute, Toronto, ON, Canada.

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A novel gut signaling network involving the glucagon-like peptide-1 receptor (GLP-1R) on intestinal immune cells regulates inflammation and mucosal integrity. This discovery offers new insights into obesity and diabetes management.

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Area of Science:

  • Immunology
  • Endocrinology
  • Gastroenterology

Background:

  • Obesity and diabetes are linked to chronic inflammation and immune dysfunction.
  • The gut immune system plays a critical role in maintaining mucosal homeostasis.
  • Intraepithelial lymphocytes (IELs) are key immune cells residing in the intestinal lining.

Purpose of the Study:

  • To investigate the role of the glucagon-like peptide-1 receptor (GLP-1R) in intestinal intraepithelial lymphocytes (IELs).
  • To elucidate the function of the IEL-GLP-1R signaling network in regulating mucosal immunity and host response to injury.

Main Methods:

  • Analysis of Glp1r expression in purified IEL subsets.
  • In vitro studies using exendin-4 and forskolin on IELs and splenocytes.
  • Phenotyping of Glp1r(-/-) mice, including gene expression, microbiome analysis, and dextran sodium sulfate (DSS) induced colitis model.
  • Bone marrow transplantation experiments.

Main Results:

  • Glp1r is expressed on Tαβ and Tγδ IELs, mediating cAMP accumulation and reducing cytokine production.
  • Glp1r(-/-) mice show altered intestinal gene expression, dysbiotic microbiota, and increased susceptibility to colitis.
  • Bone marrow from wild-type mice restored immune gene expression in Glp1r(-/-) recipients.
  • Exendin-4 administration induced cytokine and chemokine gene expression in the intestine.

Conclusions:

  • A local intestinal IEL-GLP-1R signaling axis controls mucosal immune responses and integrity.
  • This network links nutrient availability, microbial interactions, and epithelial defense.
  • Targeting the IEL-GLP-1R pathway may offer therapeutic strategies for inflammatory conditions associated with metabolic diseases.