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Amine oxidase [flavin-containing] B (EC (Monoamine oxidase type B) (MAO-B)


Modulation of KDM1A with vafidemstat rescues memory deficit and behavioral alterations.

Transcription disequilibria are characteristic of many neurodegenerative diseases. The activity-evoked transcription of immediate early genes (IEGs), important for neuronal plasticity, memory and behavior, is altered in CNS diseases and governed by epigenetic modulation. KDM1A, a histone 3 lysine 4 demethylase that forms part of transcription regulation complexes, has been implicated in the control of IEG transcription. Here we report the development of vafidemstat (ORY-2001), a brain penetrant inhibitor of KDM1A and MAOB. ORY-2001 efficiently inhibits brain KDM1A at doses suitable for long term treatment, and corrects memory deficit as assessed in the novel object recognition testing in the Senescence Accelerated Mouse Prone 8 (SAMP8) model for accelerated aging and Alzheimer's disease. Comparison with a selective KDM1A or MAOB inhibitor reveals that KDM1A inhibition is key for efficacy. ORY-2001 further corrects behavior alterations including aggression and social interaction deficits in SAMP8 mice and social avoidance in the rat rearing isolation model. ORY-2001 increases the responsiveness of IEGs, induces genes required for cognitive function and reduces a neuroinflammatory signature in SAMP8 mice. Multiple genes modulated by ORY-2001 are differentially expressed in Late Onset Alzheimer's Disease. Most strikingly, the amplifier of inflammation S100A9 is highly expressed in LOAD and in the hippocampus of SAMP8 mice, and down-regulated by ORY-2001. ORY-2001 is currently in multiple Phase IIa studies.

MeSH Terms

  • Aging
  • Alzheimer Disease
  • Animals
  • Behavior, Animal
  • Brain
  • Disease Models, Animal
  • Enzyme Inhibitors
  • Epigenesis, Genetic
  • Female
  • Gene Expression
  • Hippocampus
  • Histone Demethylases
  • Humans
  • Male
  • Memory Disorders
  • Mice
  • Mice, Inbred C57BL
  • Mice, Mutant Strains
  • Monoamine Oxidase Inhibitors
  • Oxadiazoles
  • Rats
  • Rats, Sprague-Dawley