Hormonal
Loss of GIP receptor (GIPR) signaling specifically in GABAergic neurons enhances the body weight loss efficacy of GLP-1 receptor agonists (such as semaglutide or tirzepatide) and dual incretin agonists.
Current obesity medications that target both GLP-1 and GIP receptors (like tirzepatide) work partly by engaging specific brain neurons (GABAergic neurons expressing GIPR). Research suggests that the body's natural GIP signaling in these neurons might actually limit how much weight you can lose with GLP-1 drugs alone. This implies that future treatments might be optimized by either stimulating or blocking GIP signaling in these specific brain cells to maximize weight loss while managing side effects like nausea.
GIPR in GABAergic neurons is essential for the enhanced weight loss efficacy of dual incretin agonism, yet, surprisingly, its removal enhances the effect of GLP-1R agonism alone.
Why this rating
High-quality preclinical evidence using genetically modified mouse models (GIPR knockout) with clear phenotypic outcomes, though translational to humans requires caution due to species differences in drug affinity.
Source
Specific loss of GIPR signaling in GABAergic neurons enhances GLP-1R agonist-induced body weight loss
Jordan Wean et al. · Molecular Metabolism · 2024
DOI 10.1016/j.molmet.2024.102074
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