OCD candidate gene /EAAT3 impacts basal ganglia-mediated activity and stereotypic behavior.

Zike ID, Chohan MO, Kopelman JM, Krasnow EN, Flicker D, Nautiyal KM, Bubser M, Kellendonk C, Jones CK, Stanwood G, Tanaka KF, Moore H, Ahmari SE, Veenstra-VanderWeele J
Proc Natl Acad Sci U S A. 2017 114 (22): 5719-5724

PMID: 28507136 · PMCID: PMC5465902 · DOI:10.1073/pnas.1701736114

Obsessive-compulsive disorder (OCD) is a chronic, disabling condition with inadequate treatment options that leave most patients with substantial residual symptoms. Structural, neurochemical, and behavioral findings point to a significant role for basal ganglia circuits and for the glutamate system in OCD. Genetic linkage and association studies in OCD point to , which encodes the neuronal glutamate/aspartate/cysteine transporter excitatory amino acid transporter 3 (EAAT3)/excitatory amino acid transporter 1 (EAAC1). However, no previous studies have investigated EAAT3 in basal ganglia circuits or in relation to OCD-related behavior. Here, we report a model of loss based on an excisable STOP cassette that yields successful ablation of EAAT3 expression and function. Using amphetamine as a probe, we found that EAAT3 loss prevents expected increases in () locomotor activity, () stereotypy, and () immediate early gene induction in the dorsal striatum following amphetamine administration. Further, -STOP mice showed diminished grooming in an SKF-38393 challenge experiment, a pharmacologic model of OCD-like grooming behavior. This reduced grooming is accompanied by reduced dopamine D receptor binding in the dorsal striatum of -STOP mice. -STOP mice also exhibit reduced extracellular dopamine concentrations in the dorsal striatum both at baseline and following amphetamine challenge. Viral-mediated restoration of /EAAT3 expression in the midbrain but not in the striatum results in partial rescue of amphetamine-induced locomotion and stereotypy in -STOP mice, consistent with an impact of EAAT3 loss on presynaptic dopaminergic function. Collectively, these findings indicate that the most consistently associated OCD candidate gene impacts basal ganglia-dependent repetitive behaviors.

MeSH Terms (17)

Amphetamines Animals Basal Ganglia Cell Line Central Nervous System Stimulants Dopamine Excitatory Amino Acid Transporter 3 Glutamic Acid Grooming Maze Learning Mice Mice, Inbred C57BL Mice, Transgenic Motor Activity Obsessive-Compulsive Disorder Receptors, Dopamine D1 Reflex, Startle

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