Evidence map›Paper›PMID 25365944›Full record

ArticleOncotarget2014

Metformin impairs Rho GTPase signaling to induce apoptosis in neuroblastoma cells and inhibits growth of tumors in the xenograft mouse model of neuroblastoma.

Ambrish Kumar, Nadia Al-Sammarraie, Donald J DiPette, Ugra S Singh

Erratum issuedOpen access · diamondAbstract read
In one paragraph

Article in Oncotarget, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
2.7field-weighted citation impact, top 9% 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

20 citing papers in PubMed, 37 citations in OpenAlex.

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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

4 authors at 1 institution in 1 country.

Ambrish KumarDepartment of Pathology, Microbiology and Immunology, University of South Carolina, Columbia, SC, USA.
Nadia Al-SammarraieDepartment of Pathology, Microbiology and Immunology, University of South Carolina, Columbia, SC, USA.
Donald J DiPetteDepartment of Internal Medicine, School of Medicine, University of South Carolina, Columbia, SC, USA.
Ugra S SinghDepartment of Pathology, Microbiology and Immunology, University of South Carolina, Columbia, SC, USA.
University of South Carolina · US

Funding

Mechanism of Alcohol Induced NeurotoxicityR21AA016121 · NIAAA · UNIVERSITY OF SOUTH CAROLINA AT COLUMBIA · PI SINGH, UGRA SEN · 2008 to 2009
$357k
NIAAA NIH HHS R21 AA016121NIAAA NIH HHS R21AA016121
6 · The paper itself

Abstract

Metformin has been shown to inhibit tumor growth in xenograft rodent models of adult cancers, and various human clinical trials are in progress. However, the precise molecular mechanisms of metformin action are largely unknown. In the present study we examined the anti-tumor activity of metformin against neuroblastoma, and determined the underlying signaling mechanisms. Using human neuroblastoma xenograft mice, we demonstrated that oral administration of metformin (100 and 250 mg/kg body weight) significantly inhibited the growth of tumors. The interference of metformin in spheroid formation further confirmed the anti-tumor activity of metformin. In tumors, the activation of Rac1 (GTP-Rac1) and Cdc42 (GTP-Cdc42) was increased while RhoA activation (GTP-RhoA) was decreased by metformin. It also induced phosphorylation of JNK and inhibited the phosphorylation of ERK1/2 without affecting p38 MAP Kinase. Infection of cells by adenoviruses expressing dominant negative Rac1 (Rac1-N17), Cdc42 (Cdc42-N17) or constitutively active RhoA (RhoA-V14), or incubation of cells with pharmacological inhibitors of Rac1 (NSC23766) or Cdc42 (ML141) significantly protected neuroblastoma cells from metformin-induced apoptosis. Additionally, inhibition of JNK activity along with Rac1 or Cdc42 attenuated cytotoxic effects of metformin. These studies demonstrated that metformin impairs Rho GTPases signaling to induce apoptosis via JNK pathway.

Indexed as

ApoptosisMAP Kinase Signaling SystemAnimalsAntineoplastic AgentsCaspase 3cdc42 GTP-Binding ProteinCell DeathCell Line, TumorCell SurvivalDNA FragmentationHumansMetforminMiceMice, NudeNeuroblastomaPhosphorylationAntineoplastic AgentsCaspase 3cdc42 GTP-Binding ProteinMetforminrac1 GTP-Binding ProteinRAC1 protein, humanrhoA GTP-Binding ProteinRHOA protein, humanrho GTP-Binding Proteins

Identifiers

PMID25365944
PMCPMC4294363
OpenAlexW2121375689

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.