Journal
BIOMEDICINE & PHARMACOTHERAPY
Volume 155, Issue -, Pages -Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.biopha.2022.113726
Keywords
ASCT; AMPA receptor; MTOR; Social defeat stress; Depression; Anxiety
Funding
- National Health Research Institutes
- Ministry of Science and Technology, Taiwan
- [NP-107-PP-05]
- [MOST 109-2636-B-007-002]
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This study found that L-4FPG has antidepressant-like effects and can improve depression-like behaviors caused by chronic social defeat stress. Furthermore, pretreatment with L-4FPG can prevent social avoidance, anxiety-like behaviors, and depression-like behaviors induced by social defeat stress. The results suggest that L-4FPG may not only be useful in alleviating depression but also in protecting against chronic stress-related psychiatric disorders.
D-serine has attracted increasing attention for its possible role in depression. L-4-Fluorophenylglycine (L-4FPG), an inhibitor of the neutral amino acid transporter ASCT1/2, has been shown to regulate extracellular D-serine levels. The present study aimed to explore the potential antidepressant effects of L-4FPG. First, the acute effects of L-4FPG on the forced swimming test, elevated plus maze test, and novelty-suppressed feeding test were examined. L-4FPG showed antidepressant-like effects, which could be reversed by rapamycin, a mammalian target of rapamycin (mTOR) inhibitor, and 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX), an alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptor antagonist. The phosphorylation levels of mTOR and GluR1 in the hippocampus were also increased after L-4FPG treatment. Next, the therapeutic effects of L-4FPG were examined in a chronic social defeat stress (CSDS) model of depression. L-4FPG ameliorated depression-like behaviors in mice subjected to CSDS. Furthermore, treatment with L-4FPG prior to each social defeat stress session not only decreased defensive behaviors but also prevented CSDS-induced social avoidance and anxiety-like and depression-like behaviors. These findings suggest that L-4FPG may be useful not only in alleviating depression but also in protecting against chronic stress-related psychiatric disorders.
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