PMID-27287542 – Incretin Hormone GLP-1 Secretion Mechanisms
Tian L, Jin T. The Incretin Hormone GLP-1 and Mechanisms Underlying Its Secretion. J Diabetes. 2016;8(6):753-765.
Quick Reference
| Property | Value |
|---|---|
| PMID | 27287542 |
| DOI | 10.1111/1753-0407.12439 |
| Year | 2016 |
| Journal | Journal of Diabetes |
| Study Type | Narrative Review |
| Evidence Level | V |
| Sample | N/A (review spanning 30 years of GLP-1 secretion research) |
| Peptide(s) Studied | GLP-1 (Native) |
Key Findings
- Summarizes 30 years of research on GLP-1 secretion mechanisms since the peptide's discovery in the mid-1980s
- Glucose sensing by L-cells involves both SGLT1-dependent electrogenic transport and sweet taste receptor (T1R2/T1R3) pathways
- Lipid-mediated GLP-1 secretion is triggered via long-chain fatty acid receptors (GPR40/FFAR1, GPR120/FFAR4) and oleoylethanolamide signaling
- Amino acids stimulate GLP-1 release through CaSR (calcium-sensing receptor) and GPRC6A activation, explaining the incretin-boosting effect of protein-rich meals
- Dietary polyphenols (from green tea, berries, cocoa) can enhance GLP-1 secretion via bitter taste receptors and direct L-cell stimulation
- The gut microbiota modulates GLP-1 release through short-chain fatty acid production (butyrate, propionate) acting on GPR41/GPR43 on L-cells
Study Design
Narrative review covering the full timeline of GLP-1 secretion research. Integrates molecular biology of nutrient sensing, electrophysiology of L-cell stimulus-secretion coupling, dietary intervention studies, and emerging microbiome research.
Limitations
- Many of the nutrient-sensing pathways described were characterized in cell lines or rodent models, with limited human validation at the time of publication
- The polyphenol and microbiome sections reflect early-stage research with small human studies and heterogeneous methodologies
- Does not cover the more recently discovered roles of bile acids and gut-derived serotonin in GLP-1 modulation
Clinical Relevance
This review provides the mechanistic rationale for dietary and nutraceutical strategies to enhance endogenous GLP-1 secretion. The identification of specific nutrient sensors (amino acid receptors, polyphenol targets, SCFA receptors) directly informs the formulation logic behind GLP-1 mimetic supplements and the science education needed for Module 5 (Weight Loss & Body Composition) of the Ageless Pep Academy.
Related
#research #narrative-review #glp-1 #evidence-level-V