Translational Development Strategies for TAK-063, a Phosphodiesterase 10A Inhibitor

Int J Neuropsychopharmacol. 2020 Nov 26;23(8):524-532. doi: 10.1093/ijnp/pyaa042.

Abstract

Background: TAK-063 is an inhibitor of phosphodiesterase 10A (PDE10A), an enzyme highly expressed in medium spiny neurons of the striatum. PDE10A hydrolyzes both cyclic adenosine monophosphate and cyclic guanosine monophosphate and modulates dopamine signaling downstream of receptor activation in both direct and indirect pathways of the striatum. TAK-063 exhibited antipsychotic-like effects in animal models; however, the translatability of these models to the clinical manifestations of schizophrenia and the meaningfulness for new targets such as PDE10A has not been established.

Methods: The TAK-063 phase 1 program included a comprehensive translational development strategy with the main objective of determining whether the antipsychotic-like pharmacodynamic effects seen in nonclinical models would translate to human subjects. To evaluate this objective, we conducted a single-rising dose study (84 healthy subjects), a positron emission tomography (PET) study (12 healthy subjects), a functional magnetic resonance imaging blood oxygen level-dependent (BOLD) study (27 healthy subjects), and a multiple-rising dose study that included people with schizophrenia (30 healthy Japanese subjects and 47 subjects with stable schizophrenia). In addition, assessments of cognition and electroencephalography (27 healthy subjects and 47 subjects with stable schizophrenia) were included.

Results: PDE10A engagement by TAK-063 was verified with a novel PET radiotracer for use in primates and humans. TAK-063 showed favorable pharmacokinetic and safety profiles in humans, and TAK-063 reduced ketamine-induced changes in electroencephalography and BOLD signaling in animal models and healthy human subjects. In addition, analogous effects on cognition were observed in animal models and human subjects.

Conclusions: Overall, the phase 1 results showed some consistent evidence of antipsychotic activity. This translational strategy may be valuable for the future development of novel therapeutic approaches, even when relevant nonclinical models are not available.

Keywords: TAK-063; phosphodiesterase 10A; schizophrenia.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antipsychotic Agents / adverse effects
  • Antipsychotic Agents / pharmacokinetics
  • Antipsychotic Agents / therapeutic use*
  • Behavior, Animal / drug effects*
  • Brain / diagnostic imaging
  • Brain / drug effects*
  • Brain / enzymology
  • Clinical Trials as Topic
  • Cognition / drug effects*
  • Electroencephalography
  • Europe
  • Humans
  • Japan
  • Magnetic Resonance Imaging
  • Models, Animal
  • Phosphodiesterase Inhibitors / adverse effects
  • Phosphodiesterase Inhibitors / pharmacokinetics
  • Phosphodiesterase Inhibitors / therapeutic use*
  • Phosphoric Diester Hydrolases / metabolism*
  • Positron-Emission Tomography
  • Pyrazoles / adverse effects
  • Pyrazoles / pharmacokinetics
  • Pyrazoles / therapeutic use*
  • Pyridazines / adverse effects
  • Pyridazines / pharmacokinetics
  • Pyridazines / therapeutic use*
  • Radioligand Assay
  • Schizophrenia / diagnosis
  • Schizophrenia / drug therapy*
  • Schizophrenic Psychology
  • Translational Research, Biomedical*
  • Treatment Outcome
  • United States

Substances

  • 1-(2-fluoro-4-(1H-pyrazol-1-yl)phenyl)-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one
  • Antipsychotic Agents
  • Phosphodiesterase Inhibitors
  • Pyrazoles
  • Pyridazines
  • PDE10A protein, human
  • Phosphoric Diester Hydrolases