Evidence map›Paper›PMID 21554718›Full record

ArticleMolecular pain2011

Local activation of cannabinoid CB₁ receptors in the urinary bladder reduces the inflammation-induced sensitization of bladder afferents.

Jean-Sébastien Walczak, Fernando Cervero

Open access · goldAbstract read
In one paragraph

Article in Molecular pain, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
5.7field-weighted citation impact, top 4% 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

20 citing papers in PubMed, 60 citations in OpenAlex.

  1. Article
  2. Review
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  6. Potential of Endocannabinoids to Control Bladder Pain.Frontiers in systems neuroscience · 2018
    Review
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  8. Article
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  17. Activation of cannabinoid receptor 2 inhibits experimental cystitis.American journal of physiology. Regulatory, integrative and comparative physiology · 2013
    Article
  18. Article
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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.

Jean-Sébastien WalczakMcGill University, Anesthesia Research Unit, Faculty of Medicine, Faculty of Dentistry and Alan Edwards Center for Research on Pain, Montréal, Québec, Canada. jean.walczak@mcgill.ca
Fernando Cervero
McGill University · CA

Funding

Canadian Institutes of Health Research
6 · The paper itself

Abstract

backgroundSystemic administration of cannabinoid agonists is known to reduce pain induced by bladder inflammation and to modulate cystometric parameters in vivo. We have previously reported that intravesical administration of a cannabinoid agonist reduces the electrical activity of bladder afferents under normal conditions. However, the effects of local activation of bladder cannabinoid receptors on afferent activity during inflammation are unknown. This study was aimed to assess the effects of intravesical administration of a cannabinoid agonist on the discharges of afferent fibers in inflamed bladders ex vivo. We also characterized the expression of CB1 receptors in the bladder and their localization and co-expression with TRPV1, a marker of nociceptive afferents.

resultsCompared to untreated animals, afferent fiber activity in inflamed bladders was increased for intravesical pressures between 10 and 40 mmHg. Local treatment with a non selective cannabinoid agonist (AZ12646915) significantly reduced the afferent activity at intravesical pressures above 20 mmHg. This effect was blocked by AM251 but not by AM630 (selective for CB1 and CB2 respectively). Finally, CB1 was co-expressed with TRPV1 in control and inflamed bladders.

conclusionThese results demonstrate that sensitization of bladder afferents induced by inflammation is partly suppressed by intravesical activation of cannabinoid receptors, an effect that appears to be mediated by CB1 receptors. Also, TRPV1 positive fibers were found to co-express CB1, supporting the hypothesis of a direct action of the cannabinoid agonist on nociceptive afferents. Taken together, these results indicate a peripheral modulation by the cannabinoid system of bladder hypersensitivity during inflammation.

Indexed as

Action PotentialsAdministration, IntravesicalAnimalsBehavior, AnimalComplianceCyclophosphamideFemaleFluorescent Antibody TechniqueInflammationInjectionsIn Vitro TechniquesMiceMice, Inbred C57BLNeurons, AfferentReceptor, Cannabinoid, CB1Receptor, Cannabinoid, CB2CyclophosphamideReceptor, Cannabinoid, CB1Receptor, Cannabinoid, CB2TRPV1 protein, mouseTRPV Cation Channels

Identifiers

PMID21554718
PMCPMC3115893
OpenAlexW2139546732

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.