Evidence map›Paper›PMID 34753919›Full record

ArticleCell death & disease2021

Extracellular vesicles from hypoxia-preconditioned microglia promote angiogenesis and repress apoptosis in stroke mice via the TGF-β/Smad2/3 pathway.

Lin Zhang, Wei Wei, Xiaoyu Ai, Ertugrul Kilic, Dirk M Hermann, Vivek Venkataramani, Mathias Bähr, Thorsten R Doeppner

Open access · goldAbstract read
In one paragraph

Article in Cell death & disease, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 107 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
107citing papers in PubMed, 2 pooled it
11.5field-weighted citation impact, top 1% 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

107 citing papers in PubMed, 2 syntheses or guidelines pooled it, 181 citations in OpenAlex.

  1. Pooled it
  2. Association Between Transforming Growth Factor-β1 Polymorphisms and Ischemic Stroke Susceptibility: A Meta-Analysis.Clinical and applied thrombosis/hemostasis : official journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis
    Pooled it
  3. Article
  4. Article
  5. Review
  6. Review
  7. Review
  8. Article
  9. Article
  10. Review
  11. Article
  12. Review
  13. NFAT1Cellular & molecular biology letters · 2026
    Article
  14. Article
  15. Review
  16. Article
  17. Article
  18. Article
  19. Journal of the American Heart Association · 2026
    Article
  20. Article

47 more citing papers are in PubMed but not listed here.

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 4 institutions in 2 countries.

Lin ZhangDepartment of Neurology, University Medical Center Göttingen, Göttingen, Germany.
Wei WeiDepartment of Neurology, University Medical Center Göttingen, Göttingen, Germany.
Xiaoyu AiDepartment of Neurology, University Medical Center Göttingen, Göttingen, Germany.
Ertugrul KilicRegenerative and Restorative Medical Research Center, Istanbul Medipol University, Istanbul, Turkey.ORCID http://orcid.org/0000-0001-6494-8923
Dirk M HermannDepartment of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
Vivek VenkataramaniDepartment of Medicine II, University Hospital Frankfurt, Frankfurt, Germany.ORCID http://orcid.org/0000-0002-6771-365X
Mathias BährDepartment of Neurology, University Medical Center Göttingen, Göttingen, Germany.
Thorsten R DoeppnerDepartment of Neurology, University Medical Center Göttingen, Göttingen, Germany. thorsten.doeppner@med.uni-goettingen.de.ORCID http://orcid.org/0000-0002-1222-9211
Universitätsmedizin Göttingen · DEIstanbul Medipol University · TRGoethe University Frankfurt · DEUniversity of Duisburg-Essen · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Systemic transplantation of oxygen-glucose deprivation (OGD)-preconditioned primary microglia enhances neurological recovery in rodent stroke models, albeit the underlying mechanisms have not been sufficiently addressed. Herein, we analyzed whether or not extracellular vesicles (EVs) derived from such microglia are the biological mediators of these observations and which signaling pathways are involved in the process. Exposing bEnd.3 endothelial cells (ECs) and primary cortical neurons to OGD, the impact of EVs from OGD-preconditioned microglia on angiogenesis and neuronal apoptosis by the tube formation assay and TUNEL staining was assessed. Under these conditions, EV treatment stimulated both angiogenesis and tube formation in ECs and repressed neuronal cell injury. Characterizing microglia EVs by means of Western blot analysis and other techniques revealed these EVs to be rich in TGF-β1. The latter turned out to be a key compound for the therapeutic potential of microglia EVs, affecting the Smad2/3 pathway in both ECs and neurons. EV infusion in stroke mice confirmed the aforementioned in vitro results, demonstrating an activation of the TGF-β/Smad2/3 signaling pathway within the ischemic brain. Furthermore, enriched TGF-β1 in EVs secreted from OGD-preconditioned microglia stimulated M2 polarization of residing microglia within the ischemic cerebral environment, which may contribute to a regulation of an early inflammatory response in postischemic hemispheres. These observations are not only interesting from the mechanistic point of view but have an immediate therapeutic implication as well, since stroke mice treated with such EVs displayed a better functional recovery in the behavioral test analyses. Hence, the present findings suggest a new way of action of EVs derived from OGD-preconditioned microglia by regulating the TGF-β/Smad2/3 pathway in order to promote tissue regeneration and neurological recovery in stroke mice.

Indexed as

AnimalsApoptosisCell HypoxiaEndothelial CellsExtracellular VesiclesHumansMiceMicrogliaNeovascularization, PathologicStrokeTransfectionTransforming Growth Factor betaTransforming Growth Factor beta

Identifiers

PMID34753919
PMCPMC8578653
OpenAlexW3213904690

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.