Glucagon-like peptide-2 regulates release of chylomicrons from the intestine

Satya Dash, Changting Xiao, Cecilia Morgantini, Philip W. Connelly, Bruce W. Patterson, Gary F. Lewis

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

BACKGROUND & AIMS: The intestine efficiently incorporates and rapidly secretes dietary fat as chylomicrons (lipoprotein particles comprising triglycerides, phospholipids, cholesterol, and proteins) that contain the apolipoprotein isoform apoB-48. The gut can store lipids for many hours after their ingestion, and release them in chylomicrons in response to oral glucose, sham feeding, or unidentified stimuli. The gut hormone glucagon-like peptide-2 (GLP-2) facilitates intestinal absorption of lipids, but its role in chylomicron secretion in human beings is unknown.

RESULTS: GLP-2 administration resulted in a rapid (within 30 minutes) and transient increase in the concentration of TRL apoB-48, compared with placebo (P =.03). Mathematic modeling of stable isotope enrichment and the mass of the TRL apoB-48 suggested that the increase resulted from the release of stored, presynthesized apoB-48 from the gut. In the validation study, administration of GLP-2 at 7 hours after the meal, in the absence of additional food intake, robustly increased levels of TRL triglycerides (P =.007), TRL retinyl palmitate (P =.002), and TRL apoB-48 (P =.04) compared with placebo.

METHODS: We performed a randomized, single-blind, cross-over study, with 2 study visits 4 weeks apart, to assess the effects of GLP-2 administration on triglyceride-rich lipoprotein (TRL) apoB-48 in 6 healthy men compared with placebo. Subjects underwent constant intraduodenal feeding, with a pancreatic clamp and primed constant infusion of deuterated leucine. In a separate randomized, single-blind, cross-over validation study, 6 additional healthy men ingested a high-fat meal containing retinyl palmitate and were given either GLP-2 or placebo 7 hours later with measurement of TRL triglyceride, TRL retinyl palmitate, and TRL apoB-48 levels.

CONCLUSIONS: Administration of GLP-2 to men causes the release of chylomicrons that comprise previously synthesized and stored apoB-48 and lipids. This transiently increases TRL apoB-48 levels compared with placebo.

Original languageEnglish
Pages (from-to)1275-1284.e4
JournalGastroenterology
Volume147
Issue number6
DOIs
StatePublished - Dec 1 2014

Keywords

  • Enterocyte
  • Fatty Acid
  • Human Trial
  • Plasma Lipid

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