Cited by 232Attention Deficit Hyperactivity DisorderNeurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology Research

Methylphenidate and Atomoxetine Enhance Prefrontal Function Through α2-Adrenergic and Dopamine D1 Receptors

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Gamo, Nao J., Wang, Min, Arnsten, Amy F.T.·2010·Journal of the American Academy of Child & Adolescent Psychiatry

Abstract

Objective This study examined the effects of the attention-deficit/hyperactivity disorder treatments, methylphenidate (MPH) and atomoxetine (ATM), on prefrontal cortex (PFC) function in monkeys and explored the receptor mechanisms underlying enhancement of PFC function at the behavioral and cellular levels.Method Monkeys performed a working memory task after administration of a wide range of MPH or ATM doses. The optimal doses were challenged with the α(2)-adrenoceptor antagonist, idazoxan, or the D(1) dopamine receptor antagonist, SCH23390 (SCH). In a parallel physiology study, neurons were recorded from the dorsolateral PFC of a monkey performing a working memory task. ATM, SCH, or the α(2) antagonist, yohimbine, were applied to the neurons by iontophoresis.Results MPH and ATM generally produced inverted-U dose-response curves, with improvement occurring at moderate doses, but not at higher doses. The beneficial effects of these drugs were blocked by idazoxan or SCH. At the cellular level, ATM produced an inverted-U dose-response effect on memory-related firing, enhancing firing for preferred directions (increasing "signals") and decreasing firing for the nonpreferred directions (decreasing "noise"). The increase in persistent firing for the preferred direction was blocked by yohimbine, whereas the suppression of firing for the nonpreferred directions was blocked by SCH.Conclusions Optimal doses of MPH or ATM improved PFC cognitive function in monkeys. These enhancing effects appeared to involve indirect stimulation of α(2) adrenoceptors and D(1) dopamine receptors in the PFC. These receptor actions likely contribute to their therapeutic effects in the treatment of attention-deficit/hyperactivity disorder.

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Crossref · 10.1016/j.jaac.2010.06.015

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  • Methylphenidate directly interacts with adrenergic receptors, and through α2 adrenergic receptor activation it stimulates cortical excitability.

    “Multiple studies have demonstrated that MPH also directly interacts with adrenergic receptors (109, 115, 119, 120). Through activation of α2 adrenergic receptors, MPH has been demonstrated to stimulate cortical excitability (109).”

    From The pharmacology of amphetamine and methylphenidate: Relevance to the neurobiology of attention-deficit/hyperactivity disorder and other psychiatric comorbidities (2018) · cites this paper as [115]

    The Conclusions describe MPH’s effects on α2 adrenoceptors as indirect, contrary to the claim of direct receptor interaction. The Discussion says MPH’s cellular actions could not be documented; the reported increase in prefrontal neuronal firing followed α2A receptor stimulation, not a demonstrated effect of MPH on cortical excitability. (LLM, conf=0.87)

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  • Optimal doses of atomoxetine improved working memory performance in monkeys, while higher doses impaired performance.

    “Thus, optimal doses improved working memory performance in monkeys, while higher doses impaired performance.”

    From Catecholamine influences on prefrontal cortical function: Relevance to treatment of attention deficit/hyperactivity disorder and related disorders (2011) · cites this paper as Gamo et al., 2010

    The Results (Behavioral Data; page unavailable) report that optimal atomoxetine doses improved spatial working-memory performance in monkeys. The claim overstates the effect of higher doses: the paper says they impaired performance or had no effect, with substantial variation among monkeys. (LLM, conf=0.86)

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  • Stimulants and nonstimulants act to alter the abnormal neural responses in ADHD patients through α2-adrenergic and dopamine D1 receptors to improve cognitive functions through the reactivity of the prefrontal cortex based on its high sensitivity to catecholamines.

    “stimulants and nonstimulants act to alter the abnormal neural responses in ADHD patients through α2-adrenergic and dopamine D1 receptors to improve cognitive functions through the reactivity of the prefrontal cortex based on its high sensitivity to catecholamines”

    From Overlapping and differential neuropharmacological mechanisms of stimulants and nonstimulants for attention-deficit/hyperactivity disorder: A comparative neuroimaging analysis (2024) · cites this paper as Gamo, Wang, & Arnsten, 2010

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  • The procognitive effects of methylphenidate in a working memory task are blocked by the α2 adrenergic antagonist idazoxan.

    “Further evidence for the interaction of MPH with α2 adrenergic receptors comes from data indicating that the procognitive effects of MPH in a working memory task are blocked by the α2 adrenergic antagonist idazoxan (115).”
  • The clinical efficacy of NE reuptake inhibitors (e.g., atomoxetine) and α2A-agonists (e.g., guanfacine) in treating ADHD underscores the therapeutic importance of the noradrenergic system.

    “The clinical efficacy of NE reuptake inhibitors (e.g., atomoxetine) and α2A-agonists (e.g., guanfacine) in treating ADHD underscores the therapeutic importance of this system”

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Research works printed but not linked: 1

  1. [21]Li BM Mei ZT Delayed-response deficit induced by local injection of the alpha 2-adrenergic antagonist yohimbine into the dorsolateral prefrontal cortex in young adult monkeys Behav Neural Biol 1994 62 134 139 7993303

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Authors
Gamo, N. J., Wang, M., & Arnsten, A. F. T.
Affiliations
Yale University (US)
Venue
Journal of the American Academy of Child & Adolescent Psychiatry
Publisher
Elsevier BV
Published
2010-10
Volume
49
Issue
10
Pages
1011-1023
ISSN
0890-8567 (ISSN-L)
OpenAlex
W2106437517
Cited by
232
References
68
Citations by year
2026: 3 · 2025: 8 · 2024: 10 · 2023: 14 · 2022: 12 · 2021: 16 · 2020: 15 · 2019: 14 · 2018: 7 · 2017: 10 · 2016: 18 · 2015: 22 · 2014: 15 · 2013: 27 · 2012: 20
FWCI
14.61
Type
journal article
Language
en
Open access
Locations
  • Journal of the American Academy of Child & Adolescent Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Mental Health (F31MH082548)
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 › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
methylphenidate, atomoxetine, attention deficit hyperactivity disorder, prefrontal cortex, alpha2-adrenoceptors, dopamine D1 receptor, working memory, idazoxan, SCH 23390, yohimbine, neuronal firing, dose-response relationship
MeSH terms
Atomoxetine Hydrochloride, Central Nervous System Stimulants, Animals, Appetitive Behavior, Attention Deficit Disorder with Hyperactivity, Brain Mapping, Child, Disease Models, Animal, Dose-Response Relationship, Drug, Female, Humans, Macaca mulatta, Male, Memory, Short-Term, Methylphenidate, Nerve Net, Orientation, Propylamines, Saccades, Prefrontal Cortex, Receptors, Dopamine D1, Pyramidal Cells, Receptors, Adrenergic, alpha-2, Adrenergic Uptake Inhibitors

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