Evidence map›Paper›PMID 32896112›Full record

ArticleNeuropsychopharmacology reports2020

Lack of rewarding effects of a soluble epoxide hydrolase inhibitor TPPU in mice: Comparison with morphine.

Xiayun Wan, Yuko Fujita, Lijia Chang, Yan Wei, Li Ma, Gerile Wuyun, Yaoyu Pu, Bruce D Hammock, Kenji Hashimoto

Open access · goldAbstract readComparative Study
In one paragraph

Article in Neuropsychopharmacology reports, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.

0numbers the graph read from it
0cells of the map it votes in
7citing papers in PubMed
0.6field-weighted citation impact, top 34% 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

7 citing papers in PubMed, 7 citations in OpenAlex.

  1. Trial
  2. The Roles of EETs in Neurological Disorders.CNS neuroscience & therapeutics · 2026
    Review
  3. Article
  4. Article
  5. TPPU Downregulates Oxidative Stress Damage and Induces BDNF Expression in PC-12 Cells.Computational and mathematical methods in medicine · 2022
    Article
  6. Article
  7. 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

9 authors at 2 institutions in 2 countries.

Xiayun WanDivision of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.
Yuko FujitaDivision of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.
Lijia ChangDivision of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.
Yan WeiDivision of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.
Li MaDivision of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.
Gerile WuyunDivision of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.
Yaoyu PuDivision of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.
Bruce D HammockDepartment of Entomology and Nematology, and UCD Comprehensive Cancer Center, University of California, Davis, CA, USA.
Kenji HashimotoDivision of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.ORCID 0000-0002-8892-0439
Center for Forensic Mental Health, Chiba University · JPUniversity of California, Davis · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

aimAlthough opioids have been used as treatment of neuropathic pain, opioids have abuse potential in humans. Since soluble epoxide hydrolase (sEH) in the metabolism of polyunsaturated fatty acids plays a key role in the pain, sEH inhibitors would be promising new therapeutic drugs for neuropathic pain. In this study, we examined the effect of the sEH inhibitor TPPU on rewarding effects in mice using the conditioned place preference (CPP) paradigm.

methodsThe rewarding effects of morphine (10 mg/kg) and TPPU (3, 10, or 30 mg/kg) in mice were examined using CPP paradigm. Furthermore, the effect of TPPU (30 mg/kg) on morphine-induced rewarding effects was examined.

resultsTPPU (3, 10, or 30 mg/kg) did not increase CPP scores in the mice whereas morphine significantly increased CPP scores in the mice. Furthermore, pretreatment with TPPU did not block the rewarding effects of morphine in the mice, suggesting that sEH does not play a role in the rewarding effect of morphine.

conclusionThis study suggests that TPPU did not have rewarding effects in rodents. This would make sEH inhibitors potential therapeutic drugs without abuse potential for neuropathic pain.

Indexed as

RewardAnalgesics, OpioidAnimalsConditioning, ClassicalEnzyme InhibitorsEpoxide HydrolasesMaleMiceMice, Inbred C57BLMorphinePhenylurea CompoundsPiperidinesSolubility1-trifluoromethoxyphenyl-3-(1-propionylpiperidine-4-yl)ureaAnalgesics, OpioidEnzyme InhibitorsEpoxide HydrolasesMorphinePhenylurea CompoundsPiperidinesconditioned place preferencedependencemorphinereward

Identifiers

PMID32896112
PMCPMC7722641
OpenAlexW3084141431

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.