Abstract
d-Amino acid oxidase (DAO) is a peroxisomal flavoenzyme that catalyzes oxidative deamination of a wide range of d-amino acids. Among the possible substrates of DAO in vivo, d-serine is proposed to be a neuromodulator of the N-methyl-d-aspartate (NMDA) type glutamate receptor. The gene for DAO was reported to be associated with schizophrenia. Since DAO is expected to be one of the key enzymes in the regulation of NMDA neurotransmission, the modulation of the enzyme activity is expected to be therapeutical for neuronal disorders. In search of the pathophysiological role of DAO, we analyzed the distribution of DAO mRNA and protein in the rat and human brain. In rat, the distribution of DAO mRNA was newly detected in choroid plexus (CP) epithelial cells in addition to glial cells of pons, medulla oblongata, and especially Bergmann glia of cerebellum. Moreover, to investigate how DAO expression level is altered in schizophrenia, we performed immunohistochemistry in the human brain. In agreement with the results in the rat brain, the immunoreactivity for DAO was detected in glial cells of rhombencephalon and in CP. Furthermore, higher level of DAO expression was observed in schizophrenic CP epithelial cells than that in non-schizophrenic cases. These results suggest that an increase in DAO expression in parts of the brain is involved in aberrant d-amino acid metabolism. In particular, gene expression of DAO in CP suggests that DAO may regulate d-amino acid concentration by modulating the cerebrospinal fluid and may be regarded as a potential therapeutic target for schizophrenia.
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Abbreviations
- DAO:
-
d-Amino acid oxidase
- NMDA:
-
N-Methyl d-aspartate
- CP:
-
Choroid plexus
- CSF:
-
Cerebrospinal fluid
- cDNA:
-
Complementary DNA
- dNTP:
-
Deoxyribonucleoside triphosphate
- PBS:
-
Phosphate buffer saline
- DIG:
-
Digoxigenin
- MAS:
-
Matsunami adhesive silane
- TEA:
-
Triethanolamine
- SSC:
-
Saline sodium citrate
- TBS-T:
-
Tris-buffered saline with Tween-20
- NBT:
-
Nitroblue tetrazolium
- BCIP:
-
5-Bromo-4-chloro-3indolyl-phosphate
- ALS:
-
Amyotrophic lateral sclerosis
- CI:
-
Cerebral infarction
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Acknowledgments
This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan. Human tissue samples were obtained from the Research Resource Network and Tokushima University Hospital. We wish to thank Dr M. Shono (Division of Biomedical Technology, Support Center for Advanced Medical Sciences, The University of Tokushima) for the assistance with the microscopy and helpful comments.
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Ono, K., Shishido, Y., Park, H.K. et al. Potential pathophysiological role of d-amino acid oxidase in schizophrenia: immunohistochemical and in situ hybridization study of the expression in human and rat brain. J Neural Transm 116, 1335–1347 (2009). https://doi.org/10.1007/s00702-009-0289-7
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DOI: https://doi.org/10.1007/s00702-009-0289-7