MPTP mouse and primate Parkinson's models, 6-OHDA-lesioned rat, haloperidol catalepsy
“Istradefylline potentiated apomorphine’s effects in a 6-OHDA-lesioned rat model of Parkinson’s disease. In the MPTP-treated primate model of Parkinson’s disease, the symptoms improved and no increase in dyskinesias was found.”
✓ VerifiedFDA pharmacology/toxicology review, p. 142Source ↗
Why that model
Clinical compound has similar high A2A affinity across species (human, marmoset, rat, mouse), allowing direct testing
“Istradefylline showed similar high affinity for the A2A receptor with Ki values of 12.4 nmol/L in human, 11 nmol/L in marmosets, 8.18 nmol/L in rats but higher affinity in the mouse (Ki of 2.2 nmol/L) and lower affinity in the dog (Ki of 65 nmol/L).”
✓ VerifiedFDA pharmacology/toxicology review, p. 30Source ↗
Reviewer's view of the efficacy data
FDA reviewer concluded the drug was active in the MPTP mouse model (improved motor function); nonclinically approvable
“The drug was active in the MPTP-treated mouse model shown by improvement of motor function.”
✓ VerifiedFDA pharmacology/toxicology review, p. 142Source ↗