MeCP2 knockout mouse model of Rett syndrome (20 mg/kg IP daily, 5 or 20 weeks)
“The pharmacology of trofinetide was characterized in in vitro and in vivo studies, including one in vivo study in an animal model of Rett syndrome (MeCP2 knockout mouse). In that study, trofinetide (0 or 20 mg/kg) was administered by intraperitoneal injection daily for 5 or 20 weeks.”
✓ VerifiedFDA pharmacology/toxicology review, p. 2Source ↗
Why that model
MeCP2 knockout mouse available as an animal model of Rett syndrome; mechanism of action unknown
“The mechanism by which trofinetide exerts therapeutic effects in patients with Rett syndrome is unknown. The pharmacology of trofinetide was characterized in in vitro and in vivo studies, including one in vivo study in an animal model of Rett syndrome (MeCP2 knockout mouse).”
✓ VerifiedFDA pharmacology/toxicology review, p. 2Source ↗
Reviewer's view of the efficacy data
Limited: increased hippocampal plasticity but only trends in dendritic complexity and no effect on locomotor or respiratory function
“However, although hippocampal synaptic plasticity increased, only a trend for increased dendritic complexity and spine length was observed, and there was no effect on locomotor or respiratory functions.”
✓ VerifiedFDA pharmacology/toxicology review, p. 9Source ↗