Evidence map›Paper›PMID 33111197›Full record

ArticlePsychopharmacology2021

Intravenous self-administration of delta-9-THC in adolescent rats produces long-lasting alterations in behavior and receptor protein expression.

Sierra J Stringfield, Mary M Torregrossa

Open access · greenAbstract read
In one paragraph

Article in Psychopharmacology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 31 papers.

0numbers the graph read from it
0cells of the map it votes in
31citing papers in PubMed
3.9field-weighted citation impact, top 6% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

31 citing papers in PubMed, 43 citations in OpenAlex.

  1. Review
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  5. Pharmacotherapy for Cannabis Use Disorder: Preclinical and Clinical Models.Current topics in behavioral neurosciences · 2026
    Review
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  11. Review
  12. Article
  13. Article
  14. Consequences of adolescent drug use.Translational psychiatry · 2023
    Review
  15. Experimenter administered ΔPharmacology, biochemistry, and behavior · 2023
    Article
  16. Article
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  18. Daily ΔBiological psychiatry global open science · 2023
    Article
  19. Review
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

2 authors at 1 institution in 1 country.

Sierra J StringfieldDepartment of Psychiatry, University of Pittsburgh, 450 Technology Drive, Suite 223, Pittsburgh, PA, 15219, USA.
Mary M TorregrossaDepartment of Psychiatry, University of Pittsburgh, 450 Technology Drive, Suite 223, Pittsburgh, PA, 15219, USA. torregrossam@upmc.edu.ORCID http://orcid.org/0000-0003-2083-0231
University of Pittsburgh · US

Funding

Training for Transformative Discovery in PsychiatryT32MH016804 · NIMH · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI SWEET, ROBERT A · 1985 to 2025
$6.2M
Mechanisms Regulating Cocaine Memory StrengthR01DA042029 · NIDA · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI TORREGROSSA, MARY M · 2016 to 2021
$1.8M
Imaging cannabinoid effects on developing cortical circuitsR21DA041563 · NIDA · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI AHMARI, SUSANNE ELIZABETH, TORREGROSSA, MARY M · 2016 to 2017
$425k
Effects of adolescent cannabinoid exposure on cortical developmentF32DA047029 · NIDA · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI STRINGFIELD, SIERRA · 2019 to 2020
$131k
NIDA NIH HHS F32 DA047029NIDA NIH HHS F32DA047029NIDA NIH HHS R01 DA042029NIDA NIH HHS R01DA042029NIDA NIH HHS R21 DA041563NIDA NIH HHS R21DA041563NIMH NIH HHS T32 MH016804
6 · The paper itself

Abstract

rationaleInitial exposure to cannabinoids, including Δ-9-tetrahydrocannabinol (THC), often occurs during adolescence. Considerable neurodevelopmental alterations occur throughout adolescence, and the environmental insult posed by exogenous cannabinoid exposure may alter natural developmental trajectories. Multiple studies suggest that long-lasting deficits in cognitive function occur as a result of adolescent cannabis use, but considerable variability exists in the magnitude of these effects.

objectivesWe sought to establish a novel procedure for achieving intravenous THC self-administration in adolescent rats in order to determine if volitional THC intake in adolescence produced indices of addiction-related behavior, altered working memory performance in adulthood, or altered the expression of proteins associated with these behaviors across several brain regions.

methodsMale and female adolescent rats learned to operantly self-administer escalating doses of THC intravenously from PD 32-51. Upon reaching adulthood they were tested in abstinence for cued reinstatement of THC-seeking and working memory performance on a delayed-match-to-sample task. In a separate cohort, glutamatergic, GABAergic, and cannabinoid receptor protein expression was measured in multiple brain regions.

resultsBoth male and female adolescents self-administered THC and exhibited cue-induced lever pressing throughout abstinence. THC-exposed males exhibited slightly enhanced working memory performance in adulthood, and better performance positively correlated with total THC self-administered during adolescence. Adolescent THC-exposed rats exhibited reductions in CB1, GABA, and glutamate receptor protein, primarily in the prefrontal cortex, dorsal hippocampus, and ventral tegmental area.

conclusionsThese results suggest that THC exposure at self-administered doses can produce moderate behavioral and molecular alterations, including sex-dependent effects on working memory performance in adulthood.

Indexed as

AgingAnimalsBehavior, AddictiveBrainDronabinolFemaleInjections, IntravenousMaleMarijuana SmokingMemory, Short-TermRatsReceptors, Cell SurfaceSelf AdministrationSex CharacteristicsDronabinolReceptors, Cell SurfaceAdolescentCannabinoidGABAGlutamatePrefrontal cortexReinstatementSelf-administrationSex differencesΔ-9-Tetrahydrocannabinol

Identifiers

PMID33111197
PMCPMC7796919
OpenAlexW3096827607

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.