Depressed Dopamine Activity in Caudate and Preliminary Evidence of Limbic Involvement in Adults With Attention-Deficit/Hyperactivity Disorder
Abstract
CONTEXT: Attention-deficit/hyperactivity disorder (ADHD) is the most prevalent psychiatric disorder of childhood. There is considerable evidence that brain dopamine is involved in ADHD, but it is unclear whether dopamine activity is enhanced or depressed. OBJECTIVE: To test the hypotheses that striatal dopamine activity is depressed in ADHD and that this contributes to symptoms of inattention. DESIGN: Clinical (ADHD adult) and comparison (healthy control) subjects were scanned with positron emission tomography and raclopride labeled with carbon 11 (D2/D3 receptor radioligand sensitive to competition with endogenous dopamine) after placebo and after intravenous methylphenidate hydrochloride (stimulant that increases extracellular dopamine by blocking dopamine transporters). The difference in [11C]raclopride's specific binding between placebo and methylphenidate was used as marker of dopamine release. Symptoms were quantified using the Conners Adult ADHD Rating Scales. SETTING: Outpatient setting. PARTICIPANTS: Nineteen adults with ADHD who had never received medication and 24 healthy controls. RESULTS: With the placebo, D2/D3 receptor availability in left caudate was lower (P < .05) in subjects with ADHD than in controls. Methylphenidate induced smaller decrements in [11C]raclopride binding in left and right caudate (blunted DA increases) (P < .05) and higher scores on self-reports of "drug liking" in ADHD than in control subjects. The blunted response to methylphenidate in caudate was associated with symptoms of inattention (P < .05) and with higher self-reports of drug liking (P < .01). Exploratory analysis using statistical parametric mapping revealed that methylphenidate also decreased [11C]raclopride binding in hippocampus and amygdala and that these decrements were smaller in subjects with ADHD (P < .001). CONCLUSIONS: This study reveals depressed dopamine activity in caudate and preliminary evidence in limbic regions in adults with ADHD that was associated with inattention and with enhanced reinforcing responses to intravenous methylphenidate. This suggests that dopamine dysfunction is involved with symptoms of inattention but may also contribute to substance abuse comorbidity in ADHD.
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DA release in a subgroup of the ADHD participants reported in this study was lower than in controls.
“However, the latter is unlikely since we had previously reported that DA release in a subgroup of the ADHD participants reported in this study was lower than in controls 33 .”
From Motivation Deficit in ADHD is Associated with Dysfunction of the Dopamine Reward Pathway (2011) · cites this paper as [33]
The co-occurrence of ADHD and SUD can be partly explained by dysfunctions in the inhibitory and reward system in the brain.
“and (associated) dysfunctions in the inhibitory and reward system in the brain [10,11]”
From Treatment of Adolescents with Concurrent Substance Use Disorder and Attention-Deficit/Hyperactivity Disorder: A Systematic Review (2021) · cites this paper as [10]
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- Authors
- Volkow, N. D., Wang, G.-J., Newcorn, J., Telang, F., Solanto, M. V., Fowler, J. S., Logan, J., Ma, Y., Schulz, K., Pradhan, K., Wong, C., & Swanson, J. M.
- Affiliations
- National Institute on Drug Abuse (US)
- ORCID
- Venue
- Archives of General Psychiatry
- Publisher
- American Medical Association (AMA)
- Published
- 2007-08-01
- Volume
- 64
- Issue
- 8
- Pages
- 932
- ISSN
- 0003-990X (ISSN-L)
- OpenAlex
- W2115518880
- Cited by
- 331
- References
- 17
- Citations by year
- 2026: 6 · 2025: 11 · 2024: 13 · 2023: 12 · 2022: 10 · 2021: 11 · 2020: 10 · 2019: 11 · 2018: 6 · 2017: 15 · 2016: 17 · 2015: 22 · 2014: 19 · 2013: 36 · 2012: 24
- FWCI
- 16.15
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Archives of General Psychiatry (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health
- National Institute of Mental Health (MH66961-02, R01MH066961)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Attention Deficit Hyperactivity Disorder
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Keywords
- attention deficit hyperactivity disorder, dopaminergic dysfunction, caudate nucleus, [11C]raclopride, methylphenidate response, inattention, limbic system, hippocampus, amygdala, drug liking, substance use comorbidity, striatal dopamine release
- MeSH terms
- Adult, Central Nervous System Stimulants, Attention, Attention Deficit Disorder with Hyperactivity, Carbon Radioisotopes, Caudate Nucleus, Corpus Striatum, Dopamine, Female, Humans, Functional Laterality, Limbic System, Male, Methylphenidate, Placebos, Psychiatric Status Rating Scales, Receptors, Dopamine, Raclopride, Positron-Emission Tomography, Dopamine Plasma Membrane Transport Proteins
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