Observational studyPloS one2016

Metformin Induces Cell Cycle Arrest, Reduced Proliferation, Wound Healing Impairment In Vivo and Is Associated to Clinical Outcomes in Diabetic Foot Ulcer Patients.

Fatima Ochoa-Gonzalez, Alberto R Cervantes-Villagrana, Julio C Fernandez-Ruiz, Hilda S Nava-Ramirez, Adriana C Hernandez-Correa, Jose A Enciso-Moreno, Julio E Castañeda-Delgado

Erratum issuedOpen access · goldFull text readObservational Study
In one paragraph

Observational study in PloS one, 2016. The graph read 1 number from its abstract, feeding 1 cell of the map, but none could be read as for or against, so it casts no vote. An erratum has been issued. Cited by 37 papers.

1number the graph read from it
0cells of the map it votes in
37citing papers in PubMed
4.2field-weighted citation impact, top 6% 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.

Read, but not usablea number the graph found but could not read as for or against

Cardiovascular eventscomparator not stated · t2dfeeds one cell of the map
OR 0.300.10 to 0.90P<0.05
Unexpectedly, as shown in Fig 5D, when analyzing for differences in the proportion of subjects with amputation, a significantly higher proportion of subjects without amputation were on metformin treatment, suggesting that metformin treatment is protective of amputation (OR = 0.30 CI = 0.1-0.9 P<0.05).

clause the extractor read what became the number

2 · Its place on the map

Where it lands on the map

Rows are treatments, columns are outcomes. The coloured squares are the cells this paper feeds, coloured by the vote it casts there. Click one to jump to what this paper adds to it.

supports the treatmentfavours the comparatorno clear differenceread, but no usable result
3 · What it changes

What it adds to each cell

For every cell the paper feeds: the belief in the claim with and without this paper, and this paper's estimate drawn against every other readable study in the cell. The ringed dot is this paper.

Metformin×cardiovascular events

No readable resultOpen on the map →What to test next →

5 readable studies in this cell: 4 favour the treatment, 1 find no difference, 0 favour the comparator.

Belief with this paper
0.50contested · 4 families support, 2 contradict · against placebo
Without itNot a counted family in this claim, so removing it changes nothing.
← favours the treatmentfavours the comparator →
1 · no effect

This paper's own estimate is on a different scale from the rest of the cell, so it is not drawn here.

4 · 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.

5 · Its place in the literature

Who cites it

37 citing papers in PubMed, 60 citations in OpenAlex.

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6 · The record

Corrections and comments

7 · Who and what money

Authors and funding

7 authors at 2 institutions in 1 country.

Fatima Ochoa-GonzalezUnidad de Investigación Biomédica de Zacatecas, Instituto Mexicano del Seguro Social (IMSS), Zacatecas, Zac., México.
Alberto R Cervantes-VillagranaUnidad Académica de Ciencias Químicas, Área de Ciencias de la Salud, Universidad Autónoma de Zacatecas, Zacatecas, México.
Julio C Fernandez-RuizUnidad de Investigación Biomédica de Zacatecas, Instituto Mexicano del Seguro Social (IMSS), Zacatecas, Zac., México.
Hilda S Nava-RamirezUnidad de Investigación Biomédica de Zacatecas, Instituto Mexicano del Seguro Social (IMSS), Zacatecas, Zac., México.
Adriana C Hernandez-CorreaUnidad Académica de Ciencias Químicas, Área de Ciencias de la Salud, Universidad Autónoma de Zacatecas, Zacatecas, México.
Jose A Enciso-MorenoUnidad de Investigación Biomédica de Zacatecas, Instituto Mexicano del Seguro Social (IMSS), Zacatecas, Zac., México.
Julio E Castañeda-DelgadoUnidad de Investigación Biomédica de Zacatecas, Instituto Mexicano del Seguro Social (IMSS), Zacatecas, Zac., México.
Mexican Social Security Institute · MXUniversidad Autónoma de Zacatecas "Francisco García Salinas" · MX

Funding

No grant is acknowledged in the PubMed record.

8 · The paper itself

Abstract

The marked sentences are the ones the graph read a number from.

backgroundSeveral epidemiological studies in diabetic patients have demonstrated a protective effect of metformin to the development of several types of cancer. The underlying mechanisms of such phenomenon is related to the effect of metformin on cell proliferation among which, mTOR, AMPK and other targets have been identified. However, little is known about the role that metformin treatment have on other cell types such as keratinocytes and whether exposure to metformin of these cells might have serious repercussions in wound healing delay and in the development of complications in diabetic patients with foot ulcers or in their exacerbation. MATERIAL AND

methodsHaCaT Cells were exposed to various concentrations of metformin and cell viability was evaluated by a Resazurin assay; Proliferation was also evaluated with a colony formation assay and with CFSE dilution assay by flow cytometry. Cell cycle was also evaluated by flow cytometry by PI staining. An animal model of wound healing was used to evaluate the effect of metformin in wound closure. Also, an analysis of patients receiving metformin treatment was performed to determine the effect of metformin treatment on the outcome and wound area. Statistical analysis was performed on SPSS v. 18 and GraphPad software v.5.

resultsMetformin treatment significantly reduces cell proliferation; colony formation and alterations of the cell cycle are observed also in the metformin treated cells, particularly in the S phase. There is a significant increase in the area of the wound of the metformin treated animals at different time points (P<0.05). There is also a significant increase in the size and wound area of the patients with diabetic foot ulcers at the time of hospitalization. A protective effect of metformin was observed for amputation, probably associated with the anti inflammatory effects reported of metformin.

conclusionsMetformin treatment reduces cell proliferation and reduces wound healing in an animal model and affects clinical outcomes in diabetic foot ulcer patients. Chronic use of this drug should be further investigated to provide evidence of their security in association with DFU.

Indexed as

Diabetes Mellitus, ExperimentalDiabetes Mellitus, Type 2Diabetic FootAdultAgedAnimalsCell Cycle CheckpointsCell LineFemaleHumansMaleMetforminMiddle AgedRatsRats, WistarWound HealingMetformin

Identifiers

PMID26963096
PMCPMC4786193
OpenAlexW2294108141

What OpenQuestion holds

Textfull text, public
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.