Cynomolgus monkeys and humanized GLP-1R knock-in (Glp1rS33W) rats, including diet-induced obese
“Efficacy was demonstrated in cynomolgus monkeys and in Glp1rS33W rats (a model of humanized GLP-1 receptor), the latter of which are genetically modified to be sensitive to orforglipron.”
✓ VerifiedFDA multi-discipline review, p. 49Source ↗
Why that model
Wild-type rodents unresponsive: GLP-1R has serine instead of tryptophan at position 33, required for binding
“Wild-type rodents lack pharmacological responsiveness to orforglipron because their GLP-1 receptor contains serine (S) at position 33 instead of tryptophan (W), which is present in humans and monkeys and is required for orforglipron binding.”
✓ VerifiedFDA multi-discipline review, p. 49Source ↗
Reviewer's view of the efficacy data
FDA: efficacy in Glp1rS33W rats comparable to semaglutide
“Notably, the observed efficacy in Glp1rS33W rats was comparable to that of semaglutide (FDA Figure 5).”
✓ VerifiedFDA multi-discipline review, p. 50Source ↗