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Incretin Hypersecretion in Gestational Diabetes Mellitus
Louise Fritsche1,2, Martin Heni1,2,3,4, Sabine S Eckstein1,2
1Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen, 72076 Tübingen, Germany.
The Journal of Clinical Endocrinology and Metabolism
|February 18, 2022
Summary
Pregnant women with gestational diabetes showed higher incretin levels, suggesting a compensatory response. Elevated glucagon-like peptide-1 (GLP-1) may protect against fetal overgrowth in GDM.
Area of Science:
- Endocrinology
- Metabolic disorders
- Pregnancy research
Background:
- Incretins, like GLP-1 and GIP, stimulate insulin secretion post-meal.
- Limited data exist on incretin dynamics during pregnancy, especially in gestational diabetes mellitus (GDM).
Purpose of the Study:
- To compare incretin responses during an oral glucose tolerance test (OGTT) in pregnant women with and without GDM.
- To investigate the relationship between incretin levels, insulin secretion, and birth outcomes.
Main Methods:
- Observational study of 167 pregnant women (33 with GDM) undergoing a 5-point, 75g OGTT.
- Assessed insulin secretion, GLP-1, GIP, glicentin, and glucagon levels.
- Linear regression analyzed incretin-glucose-insulin relationships and birth outcome associations.
Main Results:
- Women with GDM had significantly lower insulin secretion (P<0.001).
- Postload GLP-1 and GIP were ~20% higher in women with GDM (P<0.05), independent of confounders.
- GLP-1 increase correlated with insulin secretion only in GDM; higher GLP-1 was linked to lower birth weight.
Conclusions:
- The elevated GLP-1 in GDM may represent a compensatory mechanism against incretin resistance.
- Higher GLP-1 levels in GDM might offer protection against fetal overgrowth.
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