Research
Hormonal
Tirzepatide stimulates insulin secretion in mouse islets predominantly through the GLP-1 receptor, with minimal GIP receptor contribution at therapeutic doses.
Research on tirzepatide using mice may not fully reflect how it works in humans, as mice require much higher doses for GIP receptor activation. This highlights the importance of human-specific studies for understanding the drug's full mechanism.
GoodQualifiesHIGH confidence
in mouse islets, tirzepatide stimulates insulin secretion predominantly through the GLP-1R, owing to reduced potency at the mouse GIPR.
Why this rating
Robust in vivo and ex vivo mouse data with genetic and pharmacological blockade.
Source
The incretin co-agonist tirzepatide requires GIPR for hormone secretion from human islets
Kimberley El et al. · Nature Metabolism · 2023
DOI 10.1038/s42255-023-00811-0
mechanism_onlyCited 109×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Tirzepatide requires GIP receptor (GIPR) activation to stimulate insulin secretion in human islets, as blocking GIPR consistently reduces this response.Good
- Tirzepatide stimulates glucagon secretion in human islets primarily through GIP receptor activation, which overrides the glucagon-suppressing effect of GLP-1 receptor activation.Good
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