Cited by 18Obsessive-Compulsive Spectrum DisordersNeurological disorders and treatmentsAttention Deficit Hyperactivity Disorder

Common neuronal mechanisms underlying tics and hyperactivity

Israelashvili, Michal, Yael, Dorin, Vinner, Esther, Belelovsky, Katya, Bar-Gad, Izhar·2020·Cortex

Abstract

Tourette syndrome (TS) and attention deficit hyperactivity disorder (ADHD) are two neurodevelopmental hyper-behavioral disorders that are highly comorbid. The source of this comorbidity and the neuronal mechanisms underlying these disorders are still unclear. We examined the neuronal activity of freely behaving rats before and after striatal disinhibition, to reveal the similar and distinct neuronal components underlying the mechanisms of TS-like and ADHD-like symptom expression. Focal disinhibition induced motor tics, locomotor hyperactivity or a comorbid effect depending on the location of the injection within the different functional domains of the striatum. While injections within the motor domain induced motor tics, injections into the limbic domain induced mainly locomotor hyperactivity. Disinhibition, regardless of its striatal location, led to qualitatively similar macro-scale and micro-scale neuronal changes. These changes were localized to the domain of the manipulation and remained partly segregated, indicating that hyperactivity is induced as a result of changes in the limbic domain without directly activating the motor domain. Despite the general similarity of induced neuronal changes, these changes were associated with different behavioral effects and were more stereotypic and pronounced following motor-domain disinhibition in comparison to limbic-domain disinhibition. Our recordings revealed a disparity in the neuronal input-output transformation of the two models of the disorders. The results suggest that tic expression and hyperactivity states share similar local neuronal activity changes which manifest in different neuronal and behavioral outcomes. These results expose an intriguing link between tics and their comorbid symptoms and hint at striatal disinhibition, resulting from GABAergic alterations, as a potential common mechanism underlying distinct symptoms expressed by hyper-behavioral patients.

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Crossref · 10.1016/j.cortex.2020.02.010

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  • Across the neurodevelopmental triad, involvement of fronto-striatal circuitry is implicated in the expression of respective symptomology.

    “Interestingly, across this neurodevelopmental triad, involvement of fronto-striatal circuitry is implicated in the expression of respective symptomology (25, 26).”

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Authors
Israelashvili, M., Yael, D., Vinner, E., Belelovsky, K., & Bar-Gad, I.
Affiliations
Bar-Ilan University (IL)
Venue
Cortex
Publisher
Elsevier BV
Published
2020-06
Volume
127
Pages
231-247
ISSN
0010-9452 (ISSN-L)
OpenAlex
W3007553923
Cited by
18
References
91
Citations by year
2026: 2 · 2025: 3 · 2024: 2 · 2023: 1 · 2022: 3 · 2021: 6 · 2020: 1
FWCI
1.09
Type
journal article
Language
en
Open access
closed
Locations
  • Cortex (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • United States-Israel Binational Science Foundation
  • Israel Science Foundation
Topics
  • Social Sciences › Psychology › Clinical Psychology › Obsessive-Compulsive Spectrum Disorders
  • Health Sciences › Medicine › Neurology › Neurological disorders and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Attention Deficit Hyperactivity Disorder
Keywords
Tourette syndrome, attention deficit hyperactivity disorder, tic disorders, comorbidities, motor tics, locomotor hyperactivity, motor domain, GABAergic dysfunction, neuronal activity, rats
MeSH terms
Animals, Attention Deficit Disorder with Hyperactivity, Corpus Striatum, Tourette Syndrome, Humans, Neurons, Tics, Rats

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