Evidence map›Paper›PMID 21075782›Full record

ArticleNeuro-oncology2011

Epigenetic regulation of glial fibrillary acidic protein by DNA methylation in human malignant gliomas.

Andres Restrepo, Christian A Smith, Sameer Agnihotri, Maryam Shekarforoush, Paul N Kongkham, Ho Jun Seol, Paul Northcott, James T Rutka

Open access · bronzeAbstract read
In one paragraph

Article in Neuro-oncology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed
1.4field-weighted citation impact, top 20% 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

26 citing papers in PubMed, 60 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

8 authors at 3 institutions in 2 countries.

Andres RestrepoDivision of Neurosurgery, Arthur and Sonia Labatt Brain Tumor Research Centre, Program in Cell Biology, Suite 1503, The Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON, Canada M5G 1X8.
Christian A Smith
Sameer Agnihotri
Maryam Shekarforoush
Paul N Kongkham
Ho Jun Seol
Paul Northcott
James T Rutka
University of Toronto · CAKangwon National University · KRSickKids Foundation · CA

Funding

Canadian Institutes of Health Research MOP 74610
6 · The paper itself

Abstract

Glial fibrillary acidic protein (GFAP) is an intermediate filament expressed in glial cells that stabilizes and maintains the cytoskeleton of normal astrocytes. In glial tumors, GFAP expression is frequently lost with increasing grade of malignancy, suggesting that GFAP is important for maintaining glial cell morphology or regulating astrocytoma cell growth. Most permanent human glioma cell lines are GFAP negative by immunocytochemistry. Given that the GFAP gene is not mutated in human glioma specimens or glioma cell lines, we considered epigenetic mechanisms, such as promoter methylation, as a cause of silencing of GFAP in these tumors. In this study, we treated known GFAP-negative glioma cell lines with 5-aza-2'-deoxycytidine to examine GFAP promoter hypermethylation. Additionally, we performed bisulfite sequencing on primary glioma samples and glioma cell lines and showed an inverse relationship between GFAP promoter methylation status and GFAP expression. Using a gene reporter assay with the GFAP promoter cloned upstream of a luciferase gene, we showed that methylation of the GFAP promoter downregulates the expression of the luciferase gene. Our results suggest that epigenetic silencing of the GFAP gene through DNA methylation of its promoter region may be one mechanism by which GFAP is downregulated in human gliomas and glioma cell lines.

Indexed as

DNA MethylationEpigenomicsGene Expression Regulation, NeoplasticBrain NeoplasmsDNA, NeoplasmFluorescent Antibody TechniqueGlial Fibrillary Acidic ProteinGliomaHumansImmunoenzyme TechniquesLuciferasesPromoter Regions, GeneticRegulatory Sequences, Nucleic AcidReverse Transcriptase Polymerase Chain ReactionRNA, MessengerTumor Cells, CulturedDNA, NeoplasmGlial Fibrillary Acidic ProteinLuciferasesRNA, Messenger

Identifiers

PMID21075782
PMCPMC3018916
OpenAlexW2108933679

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.