Evidence map›Paper›PMID 22552582›Full record

ArticleInternational journal of oncology2012

Green tea polyphenols increase p53 transcriptional activity and acetylation by suppressing class I histone deacetylases.

Vijay S Thakur, Karishma Gupta, Sanjay Gupta

Open access · bronzeAbstract read
In one paragraph

Article in International journal of oncology, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 52 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
52citing papers in PubMed, 1 pooled it
6.2field-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

52 citing papers in PubMed, 1 synthesis or guideline pooled it, 105 citations in OpenAlex.

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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

3 authors at 1 institution in 1 country.

Vijay S ThakurDepartment of Urology and Nutrition, Case Western Reserve University, Cleveland, OH 44106, USA.
Karishma Gupta
Sanjay Gupta
Case Western Reserve University · US

Funding

Molecular Mechanisms of GSTP1 Reactivation by Green Tea PolyphenolsR01CA115491 · NCI · CASE WESTERN RESERVE UNIVERSITY · PI GUPTA, SANJAY · 2007 to 2011
$1.3M
Reactivation of GSTP1 Gene by Green Tea PolyphenolsR21CA109424 · NCI · CASE WESTERN RESERVE UNIVERSITY · PI GUPTA, SANJAY · 2004 to 2005
$252k
NCI NIH HHS R01 CA115491NCI NIH HHS R21 CA109424
6 · The paper itself

Abstract

Acetylation of the tumor suppressor gene p53 at the carboxy-terminal lysine (Lys) residues enhances its transcriptional activity associated with cell cycle arrest and apoptosis. Histone deacetylases (HDACs), a family of evolutionarily conserved enzymes, counterbalance the acetylation of lysine residues on histone and non-histone proteins. In this study, we demonstrate that green tea polyphenols (GTPs) and their major constituent, (-) epigallocatechin-3-gallate (EGCG), activate p53 through acetylation at the Lys373 and Lys382 residues by inhibiting class I HDACs in LNCaP human prostate cancer cells. Treatment of cells with GTPs (2.5-10 µg/ml) and EGCG (5-20 µM) resulted in dose- and time-dependent inhibition of class I HDACs (HDAC1, 2, 3 and 8), albeit at varying levels. Discontinuation of treatment with GTP/EGCG resulted in the loss of p53 acetylation at both the sites in these cells. GTP/EGCG treatment also resulted in increased expression of p21/waf1 and Bax at the protein and message levels in these cells. The increased GTP/EGCG-mediated p53 acetylation enhanced its binding on the promoters of p21/waf1 and Bax, which was associated with increased accumulation of cells in the G0/G1 phase of the cell cycle and induction of apoptosis. Our findings indicate that GTP/EGCG causes acetylation of p53 by inhibiting class I HDACs, a function that is likely to be part of the mechanisms that control the physiological activity of p53.

Indexed as

AcetylationApoptosisbcl-2-Associated X ProteinCamellia sinensisCatechinCell Line, TumorCyclin-Dependent Kinase Inhibitor p21G1 Phase Cell Cycle CheckpointsGene ExpressionHistone Deacetylase InhibitorsHistone DeacetylasesHumansMalePlant ExtractsPolyphenolsPromoter Regions, GeneticBAX protein, humanbcl-2-Associated X ProteinCatechinCDKN1A protein, humanCyclin-Dependent Kinase Inhibitor p21epigallocatechin gallateHistone Deacetylase InhibitorsHistone DeacetylasesPlant ExtractsPolyphenolsTP53 protein, humanTumor Suppressor Protein p53

Identifiers

PMID22552582
PMCPMC3580388
OpenAlexW2080631994

What OpenQuestion holds

Textmetadata
LicenceTDM
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.