Title:Complex Processes Underlying the Dynamic Changes of D-serine Levels in
AD Brains
Volume: 19
Issue: 7
Author(s): Xiance Ni and Hisashi Mori*
Affiliation:
- Graduate School of Innovative Life Science, University of Toyama, Toyama 930-0194, Japan
- Research Center for
Idling Brain Science (RCIBS), University of Toyama, Toyama 930-0194, Japan
Keywords:
Alzheimer’s disease, D-serine, serine racemase, NMDAR, cognition, synaptic transmission, neurodegeneration.
Abstract:
Background: Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by
extracellular β-amyloid (Aβ) plaques and cognitive impairments. D-Serine, produced by the enzyme
serine racemase (SR) in the brain, functions as an endogenous co-agonist at the glycine-binding site
of N-methyl-D-aspartate receptor (NMDAR), has been implicated in the pathophysiological progression
of AD.
Objectives: Evidence regarding the understanding of the role and dynamic modulation of D-serine
during AD progression remains controversial. This literature review aims to offer novel research directions
for studying the functions and metabolisms of D-serine in AD brains.
Methods: We searched PubMed, using D-serine/SR and AD as keywords. Studies related to NMDAR
dysfunction, neuronal excitotoxicity, D-serine dynamic changes and inflammatory response were included.
Results: This review primarily discusses: (i) Aβ oligomers’ role in NMDAR dysregulation, and the
subsequent synaptic dysfunction and neuronal damage in AD, (ii) D-serine’s role in NMDAR-elicited
excitotoxicity, and (iii) the involvement of D-serine and SR in AD-related inflammatory pathological
progression.
Conclusion: We also presented supposed metabolism and dynamic changes of D-serine during AD
progression and hypothesized that: (i) the possible modulation of D-serine levels or SR expression as
an effective method of alleviating neurotoxicity during AD pathophysiological progression, and (ii)
the dynamic changes of D-serine levels in AD brains possibly resulting from complex processes.