Evidence map›Paper›PMID 15685214›Full record

ArticleBritish journal of pharmacology2005

Effects of piperine, the pungent component of black pepper, at the human vanilloid receptor (TRPV1).

Fergal N McNamara, Andrew Randall, Martin J Gunthorpe

Open access · bronzeAbstract readComparative Study
In one paragraph

Article in British journal of pharmacology, 2005. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 96 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
96citing papers in PubMed, 2 pooled it
4.2field-weighted citation impact, top 5% 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

96 citing papers in PubMed, 2 syntheses or guidelines pooled it, 305 citations in OpenAlex.

  1. Pooled it
  2. The Impact of TRPV1 on Cancer Pathogenesis and Therapy: A Systematic Review.International journal of biological sciences · 2021
    Pooled it
  3. Article
  4. Article
  5. A double-blinded randomized clinical trial: Topical Sahasthara extractJournal of traditional and complementary medicine · 2026
    Article
  6. Article
  7. Article
  8. Article
  9. Review
  10. Article
  11. Article
  12. Article
  13. Review
  14. Review
  15. Article
  16. Capsaicin: Emerging Pharmacological and Therapeutic Insights.Current issues in molecular biology · 2024
    Review
  17. Article
  18. Magnetogenetic cell activation using endogenous ferritin.bioRxiv : the preprint server for biology · 2024
    Article
  19. Article
  20. Article

36 more citing papers are in PubMed but not listed here.

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

3 authors at 1 institution in 1 country.

Fergal N McNamaraNeurology & GI-CEDD, GlaxoSmithKline, New Fronteirs Science Park, Third Avenue, Harlow, Essex CM19 5AW.
Andrew Randall
Martin J Gunthorpe
GlaxoSmithKline (United Kingdom) · GB

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

1. We have characterised the effects of piperine, a pungent alkaloid found in black pepper, on the human vanilloid receptor TRPV1 using whole-cell patch-clamp electrophysiology. 2. Piperine produced a clear agonist activity at the human TRPV1 receptor yielding rapidly activating whole-cell currents that were antagonised by the competitive TRPV1 antagonist capsazepine and the non-competitive TRPV1 blocker ruthenium red. 3. The current-voltage relationship of piperine-activated currents showed pronounced outward rectification (25+/-4-fold between -70 and +70 mV) and a reversal potential of 0.0+/-0.4 mV, which was indistinguishable from that of the prototypical TRPV1 agonist capsaicin. 4. Although piperine was a less potent agonist (EC50=37.9+/-1.9 microM) than capsaicin (EC50=0.29+/-0.05 microM), it demonstrated a much greater efficacy (approximately two-fold) at TRPV1. 5. This difference in efficacy did not appear to be related to the proton-mediated regulation of the receptor since a similar degree of potentiation was observed for responses evoked by piperine (230+/-20%, n=11) or capsaicin (284+/-32%, n=8) upon acidification to pH 6.5. 6. The effects of piperine upon receptor desensitisation were also unable to explain this effect since piperine resulted in more pronounced macroscopic desensitisation (t(1/2)=9.9+/-0.7 s) than capsaicin (t(1/2)>20 s) and also caused greater tachyphylaxis in response to repetitive agonist applications. 7. Overall, our data suggest that the effects of piperine at human TRPV1 are similar to those of capsaicin except for its propensity to induce greater receptor desensitisation and, rather remarkably, exhibit a greater efficacy than capsaicin itself. These results may provide insight into the TRPV1-mediated effects of piperine on gastrointestinal function.

Indexed as

AlkaloidsBenzodioxolesCapsaicinCell LineHumansHydrogen-Ion ConcentrationPatch-Clamp TechniquesPiperidinesPiper nigrumPolyunsaturated AlkamidesReceptors, DrugRuthenium RedStructure-Activity RelationshipAlkaloidsBenzodioxolesCapsaicincapsazepinePiperidinespiperinePolyunsaturated AlkamidesReceptors, DrugRuthenium Red

Identifiers

PMID15685214
PMCPMC1576058
OpenAlexW2017492367

What OpenQuestion holds

Textmetadata
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.