Cited by 321Attention Deficit Hyperactivity DisorderNeurotransmitter Receptor Influence on BehaviorSchizophrenia research and treatment

Relationship between blockade of dopamine transporters by oral methylphenidate and the increases in extracellular dopamine: therapeutic implications

Open access
Volkow, Nora D., Wang, Gene‐Jack, Fowler, Joanna S., Logan, Jean, Franceschi, Dinko, Maynard, Laurence, Ding, Yu‐Shin, Gatley, Samuel J. +3 more·2002·Synapse

Abstract

Methylphenidate (Ritalin) is an effective drug in the treatment of attention deficit hyperactivity disorder. However, the doses required therapeutically vary significantly between subjects and it is not understood what determines these differences. Since methylphenidate's therapeutic effects are in part due to increases in extracellular DA secondary to blockade of dopamine transporters (DAT), the variability could reflect differences in levels of DAT blockade. Here we used PET to assess if for a given dose of methylphenidate the differences in DAT blockade account for the variability in methylphenidate-induced increases in extracellular DA. Ten healthy adult subjects were tested before and 60 min after oral methylphenidate (60 mg) with PET to estimate DAT occupancy (with [(11)C]cocaine as the radioligand) and levels of extracellular DA (with [(11)C]raclopride as the D2 receptor radioligand that competes with endogenous DA for binding to the receptor). Methylphenidate significantly blocked DAT (60 +/- 11%) and increased extracellular DA in brain (16 +/- 8% reduction in [(11)C]raclopride binding in striatum). However, the correlation between methylphenidate-induced DAT blockade and DA increases was not significant. These results indicate that for a given dose of methylphenidate, individual differences in DAT blockade are not the main source for the intersubject variability in MP-induced increases in DA. This finding suggests that individual differences in response to MP are due in part to individual differences in DA release, so that for an equivalent level of DAT blockade, MP would induce smaller DA changes in subjects with low than with high DA cell activity.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1002/syn.10038

Cites

42 of 42 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Clinical doses of methylphenidate in adults and adolescents increased extrasynaptic levels of dopamine in the striatum due to potent blockade of dopamine transporters.

    “Studies using positron emission tomography show that clinical doses of methylphenidate in adults (Volkow et al., 2002) and adolescents (Neto et al., 2002) increased (rather than decreased, as proposed by some theories) extrasynaptic levels of dopamine in the striatum due to potent blockade of dopamine transporters”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Volkow, N. D., Wang, G., Fowler, J. S., Logan, J., Franceschi, D., Maynard, L., Ding, Y., Gatley, S. J., Gifford, A., Zhu, W., & Swanson, J. M.
Affiliations
  • Brookhaven National Laboratory (US)
  • State University of New York (US)
  • University of California, Irvine (US)
Corresponding author
Volkow, Nora D.
Venue
Synapse
Publisher
Wiley
Published
2001-12-14
Volume
43
Issue
3
Pages
181-187
ISSN
  • 0887-4476 (ISSN-L)
  • 1098-2396
OpenAlex
W2169328132
Cited by
321
References
42
Citations by year
2026: 8 · 2025: 8 · 2024: 12 · 2023: 9 · 2022: 7 · 2021: 8 · 2020: 4 · 2019: 11 · 2018: 12 · 2017: 13 · 2016: 10 · 2015: 8 · 2014: 15 · 2013: 13 · 2012: 22
FWCI
8.84
Type
journal article
Language
en
Open access
Locations
  • Synapse (publishedVersion)
  • PubMed (publishedVersion)
  • Zenodo (CERN European Organization for Nuclear Research) (submittedVersion, public-domain)
Funders
  • U.S. Department of Energy
  • National Institutes of Health (5r01da009490-08)
  • National Institute on Drug Abuse (DA 09490-01, DA-06278, R01DA006278)
  • Brookhaven National Laboratory
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Attention Deficit Hyperactivity Disorder
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
Keywords
methylphenidate, extracellular dopamine, attention deficit hyperactivity disorder, drug response variability, striatum, D2 receptor binding, dopamine release
MeSH terms
Administration, Oral, Adult, Age Factors, Attention Deficit Disorder with Hyperactivity, Behavior, Brain, Carbon Radioisotopes, Cardiovascular Physiological Phenomena, Cocaine, Dopamine, Extracellular Space, Humans, Male, Membrane Glycoproteins, Methylphenidate, Nerve Tissue Proteins, Neurons, Tomography, Emission-Computed, Up-Regulation, Neostriatum, Dopamine Antagonists, Dopamine Uptake Inhibitors, Raclopride, Membrane Transport Proteins, Membrane Transport Modulators, Dopamine Plasma Membrane Transport Proteins

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review