Hormonal
Disruption of both GLP-1 and GIP receptors (double incretin receptor knockout) induces resistance to high-fat diet-induced obesity and preserves insulin sensitivity despite impaired pancreatic beta-cell adaptation.
This research highlights that the GLP-1 and GIP pathways play a critical role in regulating body weight and energy expenditure beyond just insulin production. While this study uses genetic knockout in mice, it supports the mechanism of action for GLP-1 receptor agonists used in weight management, suggesting that these drugs work by modulating energy expenditure and adipokine secretion in addition to glucose control.
Both single incretin receptor knockout and DIRKO mice exhibited resistance to diet-induced obesity, preservation of insulin sensitivity, and increased energy expenditure associated with increased locomotor activity.
Why this rating
High-quality controlled animal study with clear phenotypic outcomes, though not directly translatable to human pharmacotherapy without extrapolation.
Source
Extrapancreatic incretin receptors modulate glucose homeostasis, body weight, and energy expenditure
Tanya Hansotia et al. · Journal of Clinical Investigation · 2006
DOI 10.1172/jci25483
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