d-Serine administration provokes lipid oxidation and decreases the antioxidant defenses in rat striatum.
ABSTRACT The present work investigated the effects of intrastriatal administration of d-serine on relevant parameters of oxidative stress in striatum of young rats. d-Serine significantly induced lipid peroxidation, reflected by the significant increase of thiobarbituric acid-reactive substances, and significantly diminished the striatum antioxidant defenses, as verified by a decrease of the levels of reduced glutathione and total antioxidant status. Finally, d-serine inhibited superoxide dismutase activity, without altering the activities of glutathione peroxidase and catalase. In contrast, this d-amino acid did not alter sulfhydryl oxidation, a measure of protein oxidative damage. The present data indicate that d-serine in vivo administration induces lipid oxidative damage and decreases the antioxidant defenses in the striatum of young rats. Therefore, it is presumed that this oxidative stress may be a pathomechanism involved at least in part in the neurological damage found in patients affected by disorders in which d-serine metabolism is compromised, leading to altered concentrations of this d-amino acid.
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ABSTRACT: Inflammation is deleterious for organs with reduced capacity of regeneration, such as the brain. Recently, studies have focused on investigating the therapeutic effects of nonsteroidal anti-inflammatory drugs (NSAIDs) in Alzheimer's disease, Parkinson's disease, Huntington's disease, and multiple sclerosis. Excitotoxicity is the pathological process when receptors for the excitatory neurotransmitter glutamate, such as the N-methyl-D-aspartate (NMDA), receptors are overactivated. This process may be involved in neurodegenerative diseases. D-serine is one of the coagonist of NMDA receptors, and increased levels of D-serine are associated with excitotoxicity. In our study, the potential neuroprotective effects of mefenamic acid, acetaminophen, and naproxen sodium were investigated against D-serine-induced oxidative stress in the rat brain in vitro. To show their potential neuroprotective properties, NSAIDs were incubated with D-serine and reactive oxygen species (ROS), malondialdehyde, and protein carbonyl content of the brain after different treatments were measured. Our results demostrate that NSAIDs used in the present study significantly reduced ROS production, lipid peroxidation, and protein oxidation against D-serine treatment.Drug and Chemical Toxicology 04/2012; 35(4):393-8. DOI:10.3109/01480545.2011.633086 · 1.10 Impact Factor
Article: Reference center spina bifidaAnnals of Physical and Rehabilitation Medicine 10/2011; 54. DOI:10.1016/j.rehab.2011.07.485
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ABSTRACT: Recently, D-serine has been identified as an important NMDA-receptor co-agonist, which might play a role in central nervous system development. We investigated this by studying rat P19 cells, an established model for neuronal and glial differentiation. Our results show that (1) the D-serine synthesizing enzyme serine racemase was expressed upon differentiation, (2) extracellular D-serine concentrations increased upon differentiation, which was inhibited by serine racemase antagonism, and (3) inhibition of D-serine synthesis or prevention of D-serine binding to the NMDA-receptor increased synaptophysin expression and intercellular connections, supporting a role for NMDA-receptor activation by D-serine, synthesized by serine racemase, in shaping synaptogenesis and neuronal circuitry during central nervous system development. In conjunction with recent evidence from literature, we therefore suggest that D-serine deficiency might be responsible for the severe neurological phenotype seen in patients with serine deficiency disorders. In addition, this may provide a pathophysiological mechanism for a role of D-serine deficiency in psychiatric disorders.01/2012; 6:47-53. DOI:10.1007/8904_2011_116