Evidence map›Paper›PMID 24324622›Full record

ArticlePloS one2013

Expression and function of methylthioadenosine phosphorylase in chronic liver disease.

Barbara Czech, Katja Dettmer, Daniela Valletta, Michael Saugspier, Andreas Koch, Axel P Stevens, Wolfgang E Thasler, Martina Müller, Peter J Oefner, Anja-Katrin Bosserhoff and 1 more

Open access · goldAbstract read
In one paragraph

Article in PloS one, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed
0.6field-weighted citation impact, top 30% 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

9 citing papers in PubMed, 9 citations in OpenAlex.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
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

11 authors at 3 institutions in 1 country.

Barbara CzechDepartment of Internal Medicine I, University Hospital Regensburg, Regensburg, Germany.
Katja Dettmer
Daniela Valletta
Michael Saugspier
Andreas Koch
Axel P Stevens
Wolfgang E Thasler
Martina Müller
Peter J Oefner
Anja-Katrin Bosserhoff
Claus Hellerbrand
University Hospital Regensburg · DEUniversity of Regensburg · DELudwig-Maximilians-Universität München · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

unlabelledTo study expression and function of methylthioadenosine phosphorylase (MTAP), the rate-limiting enzyme in the methionine and adenine salvage pathway, in chronic liver disease.

designMTAP expression was analyzed by qRT-PCR, Western blot and immunohistochemical analysis. Levels of MTA were determined by liquid chromatography-tandem mass spectrometry.

resultsMTAP was downregulated in hepatocytes in murine fibrosis models and in patients with chronic liver disease, leading to a concomitant increase in MTA levels. In contrast, activated hepatic stellate cells (HSCs) showed strong MTAP expression in cirrhotic livers. However, also MTA levels in activated HSCs were significantly higher than in hepatocytes, and there was a significant correlation between MTA levels and collagen expression in diseased human liver tissue indicating that activated HSCs significantly contribute to elevated MTA in diseased livers. MTAP suppression by siRNA resulted in increased MTA levels, NFκB activation and apoptosis resistance, while overexpression of MTAP caused the opposite effects in HSCs. The anti-apoptotic effect of low MTAP expression and high MTA levels, respectively, was mediated by induced expression of survivin, while inhibition of survivin abolished the anti-apoptotic effect of MTA on HSCs. Treatment with a DNA demethylating agent induced MTAP and reduced survivin expression, while oxidative stress reduced MTAP levels but enhanced survivin expression in HSCs.

conclusionMTAP mediated regulation of MTA links polyamine metabolism with NFκB activation and apoptosis in HSCs. MTAP and MTAP modulating mechanisms appear as promising prognostic markers and therapeutic targets for hepatic fibrosis.

Indexed as

Gene Expression RegulationAdenineAnimalsApoptosisChronic DiseaseHepatic Stellate CellsHepatocytesHumansInhibitor of Apoptosis ProteinsLiver CirrhosisMethionineMiceNF-kappa BPurine-Nucleoside PhosphorylaseRepressor ProteinsRNA, Small Interfering5'-methylthioadenosine phosphorylaseAdenineBirc5 protein, mouseInhibitor of Apoptosis ProteinsMethionineNF-kappa BPurine-Nucleoside PhosphorylaseRepressor ProteinsRNA, Small InterferingSurvivinThionucleotides

Identifiers

PMID24324622
PMCPMC3855635
OpenAlexW1983633780

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.