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Keywords:

  • chorea;
  • dystonia;
  • on-time;
  • macaque;
  • MPTP

ABSTRACT

Background

Blocking metabotropic glutamate receptor type 5 (mGluR5) has been proposed as a target for levodopa-induced dyskinesias (LID) in Parkinson's disease (PD). We assessed the effect on LID of dipraglurant, a potent selective mGluR5 receptor negative allosteric modulator in the gold-standard LID macaque model.

Methods

Dipraglurant (3, 10, and 30 mg/kg, by mouth) was tested in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) macaque model of LID in a four-way crossover, single-dose, controlled study (n = 8).

Results

Dipraglurant inhibited dyskinesias in the LID macaque model, with best effect reached at 30 mg/kg dose with no alteration of levodopa efficacy.

Conclusion

Acute challenges of dipraglurant were efficacious on choreic and dystonic LID in the MPTP-macaque model. Dipraglurant pharmacokinetic variables were similar to those of levodopa, suggesting that both drugs can be co-administered simultaneously in further studies. © 2014 International Parkinson and Movement Disorder Society