Journal
EUROPEAN JOURNAL OF NEUROSCIENCE
Volume 41, Issue 9, Pages 1167-1179Publisher
WILEY
DOI: 10.1111/ejn.12880
Keywords
d-serine; glutamate; N-methyl-d-aspartate receptor; preclinical model; schizophrenia
Categories
Funding
- University of Oxford Christopher Welch Scholarship
- Wellcome Trust Strategic Award [098461/Z/12/Z]
- University of Oxford Sleep and Circadian Neuroscience Institute (SCNi)
- BBSRC
- MRC
- Takeda Cambridge Ltd
- Wellcome Trust [074385, 087736]
- MRC [G0801352] Funding Source: UKRI
- Medical Research Council [G0801352] Funding Source: researchfish
- Wellcome Trust [098461/Z/12/Z] Funding Source: Wellcome Trust
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d-amino acid oxidase (DAO, DAAO) is an enzyme that degrades d-serine, the primary endogenous co-agonist of the synaptic N-methyl-d-aspartate receptor. Convergent evidence implicates DAO in the pathophysiology and potential treatment of schizophrenia. To better understand the functional role of DAO, we characterized the behaviour of the first genetically engineered Dao knockout (Dao(-/-)) mouse. Our primary objective was to assess both spatial and non-spatial short-term memory performance. Relative to wildtype (Dao(+/+)) littermate controls, Dao(-/-) mice demonstrated enhanced spatial recognition memory performance, improved odour recognition memory performance, and enhanced spontaneous alternation in the T-maze. In addition, Dao(-/-) mice displayed increased anxiety-like behaviour in five tests of approach/avoidance conflict: the open field test, elevated plus maze, successive alleys, light/dark box and novelty-suppressed feeding. Despite evidence of a reciprocal relationship between anxiety and sleep and circadian function in rodents, we found no evidence of sleep or circadian rhythm disruption in Dao(-/-) mice. Overall, our observations are consistent with, and extend, findings in the natural mutant ddY/Dao(-) line. These data add to a growing body of preclinical evidence linking the inhibition, inactivation or deletion of DAO with enhanced cognitive performance. Our results have implications for the development of DAO inhibitors as therapeutic agents.
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