PMID- 37424412 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230901 IS - 1738-1088 (Print) IS - 2093-4327 (Electronic) IS - 1738-1088 (Linking) VI - 21 IP - 3 DP - 2023 Aug 31 TI - The Role of Glutamate Underlying Treatment-resistant Depression. PG - 429-446 LID - 10.9758/cpn.22.1034 [doi] AB - The monoamine hypothesis has significantly improved our understanding of mood disorders and their treatment by linking monoaminergic abnormalities to the pathophysiology of mood disorders. Even 50 years after the monoamine hypothesis was established, some patients do not respond to treatments for depression, including selective serotonin reuptake drugs. Accumulating evidence shows that patients with treatment-resistant depression (TRD) have severe abnormalities in the neuroplasticity and neurotrophic factor pathways, indicating that different treatment approaches may be necessary. Therefore, the glutamate hypothesis is gaining attention as a novel hypothesis that can overcome monoamine restrictions. Glutamate has been linked to structural and maladaptive morphological alterations in several brain areas associated with mood disorders. Recently, ketamine, an N-methyl-D-aspartate receptor (NMDAR) antagonist, has shown efficacy in TRD treatment and has received the U.S. Food and Drug Administration approval, revitalizing psychiatry research. However, the mechanism by which ketamine improves TRD remains unclear. In this review, we re-examined the glutamate hypothesis, bringing the glutamate system onboard to join the modulation of the monoamine systems, emphasizing the most prominent ketamine antidepressant mechanisms, such as NMDAR inhibition and NMDAR disinhibition in GABAergic interneurons. Furthermore, we discuss the animal models used in preclinical studies and the sex differences in the effects of ketamine. FAU - Kim, Jeongseop AU - Kim J AUID- ORCID: 0000-0001-5281-7678 AD - Emotion, Cognition & Behavior Research Group, Korea Brain Research Institute (KBRI), Daegu, Korea. AD - Department of Brain Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea. FAU - Kim, Tae-Eun AU - Kim TE AUID- ORCID: 0000-0001-5813-1132 AD - Emotion, Cognition & Behavior Research Group, Korea Brain Research Institute (KBRI), Daegu, Korea. AD - Department of Brain Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea. FAU - Lee, Seung-Hwan AU - Lee SH AUID- ORCID: 0000-0003-0305-3709 AD - Department of Psychiatry, Inje University Ilsan Paik Hospital, Goyang, Korea. FAU - Koo, Ja Wook AU - Koo JW AUID- ORCID: 0000-0001-6233-1583 AD - Emotion, Cognition & Behavior Research Group, Korea Brain Research Institute (KBRI), Daegu, Korea. AD - Department of Brain Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea. LA - eng PT - Journal Article PT - Review PL - Korea (South) TA - Clin Psychopharmacol Neurosci JT - Clinical psychopharmacology and neuroscience : the official scientific journal of the Korean College of Neuropsychopharmacology JID - 101207332 PMC - PMC10335903 OTO - NOTNLM OT - Chronic stress OT - Glutamate hypothesis OT - Ketamine OT - Models OT - Sex characteristics OT - Treatment-resistant depression OT - animal COIS- Conflicts of Interest No potential conflict of interest relevant to this article was reported. EDAT- 2023/07/10 06:42 MHDA- 2023/07/10 06:43 PMCR- 2023/08/31 CRDT- 2023/07/10 04:12 PHST- 2022/10/11 00:00 [received] PHST- 2022/10/24 00:00 [revised] PHST- 2022/10/25 00:00 [accepted] PHST- 2023/07/10 06:43 [medline] PHST- 2023/07/10 06:42 [pubmed] PHST- 2023/07/10 04:12 [entrez] PHST- 2023/08/31 00:00 [pmc-release] AID - cpn.22.1034 [pii] AID - cpn-21-3-429 [pii] AID - 10.9758/cpn.22.1034 [doi] PST - ppublish SO - Clin Psychopharmacol Neurosci. 2023 Aug 31;21(3):429-446. doi: 10.9758/cpn.22.1034.