Pharmacopsychiatry
DOI: 10.1055/s-0043-118665
Review
© Georg Thieme Verlag KG Stuttgart · New York

Role of Glutamatergic System in Obsessive-Compulsive Disorder with Possible Therapeutic Implications

Přemysl Vlček1, 2, Jakub Polák1, Martin Brunovský1, 2, Jiří Horáček1, 2
  • 1National Institute of Mental Health, Topolová 748, 250 67 Klecany, Czech Republic
  • 2Third Faculty of Medicine, Charles University, Ruská 87, 100 00 Prague 10, Czech Republic
Further Information

Publication History

received 26 June 2017
revised 07 August 2017

accepted 11 August 2017

Publication Date:
26 September 2017 (eFirst)

Abstract

Obsessive-compulsive disorder (OCD) is a chronic psychiatric illness and 1 of the most common anxiety disorders with the prevalence of 3%. Although its pathogenesis remains unclear, the traditional model focused on alternations in the serotonin system. Selective serotonin reuptake inhibitors provide the most effective treatment; however, as much as 40–60% of patients do not respond to antidepressants therapy. Thus, attention has shifted towards other neurotransmitter systems and related neuroanatomical structures. Recently, there is extensive evidence showing a key role of glutamate pathways abnormalities within the cortico-striatal-thalamo-cortical circuitry and temporal lobes in OCD pathogenesis. In this review, we link together the existent neuroanatomical, neurophysiological, and neuropsychological evidence to argue for potential benefits of adjuvant treatment with glutamatergic agents, especially memantine. By a targeted de-excitation effect on the glutamatergic system in the temporal lobes and connected brain regions, memantine might further alleviate OCD symptoms. This effect should be even more pronounced in certain subtypes of patients with specific cognitive deficits and maladaptive compensatory memory processes (e.g., checkers).