Evidence map›Paper›PMID 31537814›Full record

ArticleScientific reports2019

Characterisation and localisation of the endocannabinoid system components in the adult human testis.

John E Nielsen, Antoine D Rolland, Ewa Rajpert-De Meyts, Christian Janfelt, Anne Jørgensen, Sofia B Winge, David M Kristensen, Anders Juul, Frédéric Chalmel, Bernard Jégou and 1 more

Erratum issuedOpen access · goldAbstract read
In one paragraph

Article in Scientific reports, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 46 papers.

0numbers the graph read from it
0cells of the map it votes in
46citing papers in PubMed
6.7field-weighted citation impact, top 3% 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

46 citing papers in PubMed, 79 citations in OpenAlex.

  1. Article
  2. Article
  3. Review
  4. Article
  5. Article
  6. Adolescent exposure to Δ9-tetrahydrocannabinol impairs testicular function in young adult male mice.Toxicological sciences : an official journal of the Society of Toxicology · 2025
    Article
  7. Article
  8. Article
  9. Article
  10. The impact of cannabinoids on reproductive function.Reproduction (Cambridge, England) · 2025
    Review
  11. The Role of the Endocannabinoid System in Human Gametogenesis.International journal of molecular sciences · 2025
    Review
  12. Article
  13. Article
  14. Human sperm RNA in male infertility.Nature reviews. Urology · 2025
    Review
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

11 authors at 2 institutions in 2 countries.

John E NielsenDepartment of Growth & Reproduction, and EDMaRC, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
Antoine D RollandUniv Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France.
Ewa Rajpert-De MeytsDepartment of Growth & Reproduction, and EDMaRC, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.ORCID http://orcid.org/0000-0002-5946-7559
Christian JanfeltDepartment of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
Anne JørgensenDepartment of Growth & Reproduction, and EDMaRC, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.ORCID http://orcid.org/0000-0002-6409-198X
Sofia B WingeDepartment of Growth & Reproduction, and EDMaRC, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
David M KristensenUniv Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France.
Anders JuulDepartment of Growth & Reproduction, and EDMaRC, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
Frédéric ChalmelUniv Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France.
Bernard JégouUniv Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France.
Niels E SkakkebaekDepartment of Growth & Reproduction, and EDMaRC, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark. nes@rh.dk.
University of Copenhagen · DKInserm · FR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Heavy use of cannabis (marijuana) has been associated with decreased semen quality, which may reflect disruption of the endocannabinoid system (ECS) in the male reproductive tract by exogenous cannabinoids. Components of ECS have been previously described in human spermatozoa and in the rodent testis but there is little information on the ECS expression within the human testis. In this study we characterised the main components of the ECS by immunohistochemistry (IHC) on archived testis tissue samples from 15 patients, and by in silico analysis of existing transcriptome datasets from testicular cell populations. The presence of 2-arachidonoylglycerol (2-AG) in the human testis was confirmed by matrix-assisted laser desorption ionization imaging analysis. Endocannabinoid-synthesising enzymes; diacylglycerol lipase (DAGL) and N-acyl-phosphatidylethanolamine-specific phospholipase D (NAPE-PLD), were detected in germ cells and somatic cells, respectively. The cannabinoid receptors, CNR1 and CNR2 were detected at a low level in post-meiotic germ cells and Leydig- and peritubular cells. Different transcripts encoding distinct receptor isoforms (CB1, CB1A, CB1B and CB2A) were also differentially distributed, mainly in germ cells. The cannabinoid-metabolising enzymes were abundantly present; the α/β-hydrolase domain-containing protein 2 (ABHD2) in all germ cell types, except early spermatocytes, the monoacylglycerol lipase (MGLL) in Sertoli cells, and the fatty acid amide hydrolase (FAAH) in late spermatocytes and post-meiotic germ cells. Our findings are consistent with a direct involvement of the ECS in regulation of human testicular physiology, including spermatogenesis and Leydig cell function. The study provides new evidence supporting observations that recreational cannabis can have possible deleterious effects on human testicular function.

Indexed as

AdultAmidohydrolasesArachidonic AcidsEndocannabinoidsFatty Acid Amide HydrolasesGlyceridesHumansHydrolasesLipoprotein LipaseMaleMonoacylglycerol LipasesPhospholipase DReceptor, Cannabinoid, CB1Receptor, Cannabinoid, CB2Semen AnalysisSertoli CellsABHD2 protein, humanAmidohydrolasesArachidonic AcidsCNR1 protein, humanCNR2 protein, humanEndocannabinoidsFatty Acid Amide HydrolasesGlyceridesglyceryl 2-arachidonateHydrolasesLipoprotein LipaseMGLL protein, humanMonoacylglycerol LipasesNAPEPLD protein, humanPhospholipase DReceptor, Cannabinoid, CB1Receptor, Cannabinoid, CB2

Identifiers

PMID31537814
PMCPMC6753062
OpenAlexW2973469872

What OpenQuestion holds

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LicenceCC BY
Read underepoch 390

Registered trials

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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.