Evidence map›Paper›PMID 21278283›Full record

ArticleDrug metabolism and disposition: the biological fate of chemicals2011

Interactions of green tea catechins with organic anion-transporting polypeptides.

Megan Roth, Barbara N Timmermann, Bruno Hagenbuch

Open access · bronzeAbstract read
In one paragraph

Article in Drug metabolism and disposition: the biological fate of chemicals, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 78 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
78citing papers in PubMed, 1 pooled it
7.6field-weighted citation impact, top 2% 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

78 citing papers in PubMed, 1 synthesis or guideline pooled it, 196 citations in OpenAlex.

  1. Pooled it
  2. Trial
  3. Trial
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  5. Effects of Green Tea Extract on Atorvastatin Pharmacokinetics in Healthy Volunteers.European journal of drug metabolism and pharmacokinetics · 2020
    Trial
  6. Trial
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  8. Article
  9. Review
  10. Article
  11. Review
  12. Green Tea: Current Knowledge and Issues.Foods (Basel, Switzerland) · 2025
    Review
  13. Article
  14. Review
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article

18 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.

Megan RothDepartment of Pharmacology, Toxicology and Therapeutics, The University of Kansas Medical Center, 3901 Rainbow Blvd., Kansas City, KS 66160, USA.
Barbara N Timmermann
Bruno Hagenbuch
University of Kansas · US

Funding

THE ROLE OF HUMAN PXR IN ANTI-TUBERCULOSIS DRUG-INDUCED LIVER INJURYP20RR021940 · NCRR · UNIVERSITY OF KANSAS MEDICAL CENTER · PI JAESCHKE, HARTMUT W. · 2006 to 2011
$12.1M
Molecular Characterization of Hepatic Organic Anion Transporting PolypeptidesR01GM077336 · NIGMS · UNIVERSITY OF KANSAS MEDICAL CENTER · PI HAGENBUCH, BRUNO · 2007 to 2019
$3.7M
NCRR NIH HHS P20 RR021940NCRR NIH HHS P20-RR021940NIGMS NIH HHS R01 GM077336NIGMS NIH HHS R01-GM077336
6 · The paper itself

Abstract

Organic anion-transporting polypeptides (OATPs) are multispecific transporters that mediate the uptake of numerous drugs and xenobiotics into cells. Here, we examined the effect of green tea (Camellia sinensis) catechins on the function of the four OATPs expressed in human enterocytes and hepatocytes. Uptake of the model substrate estrone-3-sulfate by cells expressing OATP1A2, OATP1B1, OATP1B3, or OATP2B1 was measured in the absence and presence of the four most abundant flavonols found in green tea. Uptake by OATP1A2, OATP1B1, and OATP2B1 was inhibited by epicatechin gallate (ECG) and epigallocatechin gallate (EGCG) in a concentration-dependent way. In contrast, OATP1B3-mediated uptake of estrone-3-sulfate was strongly stimulated by EGCG at low substrate concentrations. The effect of EGCG on OATP1B3 was also studied with additional substrates: uptake of estradiol-17β-glucuronide was unchanged, whereas uptake of Fluo-3 was noncompetitively inhibited. Both ECG and EGCG were found to be substrates of OATP1A2 (K(m) values of 10.4 and 18.8 μM, respectively) and OATP1B3 (34.1 and 13.2 μM, respectively) but not of OATP1B1 or OATP2B1. These results indicate that two of the major flavonols found in green tea have a substantial effect on the function of OATPs expressed in enterocytes and hepatocytes and can potentially alter the pharmacokinetics of drugs and other OATP substrates. In addition, the diverse effects of EGCG on the transport of other OATP1B3 substrates suggest that different transport/binding sites are involved.

Indexed as

Camellia sinensisAniline CompoundsAnimalsAntioxidantsBiological TransportCatechinCell LineCHO CellsCricetinaeCricetulusDrug InteractionsEnterocytesEstradiolEstroneFluorescent DyesHepatocytesAniline CompoundsAntioxidantsCatechinepicatechin gallateepigallocatechin gallateEstradiolestradiol-17 beta-glucuronideEstroneestrone sulfateFluo-3Fluorescent DyesOrganic Anion TransportersTeaXanthenes

Identifiers

PMID21278283
PMCPMC3082372
OpenAlexW2163008981

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.