Abstract
Research question
What is the specific mechanism of umbilical cord mesenchymal stem cell-derived exosomes
(UCMSC-exos) in regulating endometrial repair and regeneration?
Design
In this study, UCMSC-exos were harvested by differential ultracentrifugation from
umbilical cord mesenchymal stem cell culture supernatant and identified with western
blotting, transmission electron microscopy and nanoparticle tracking analysis. Transforming
growth factor-β1 (TGFβ1) at different concentrations was used to construct the intrauterine
adhesions cell model. The fibrotic markers were assessed by quantitative reverse transcription-polymerase
chain reaction and western blotting. The effects of miR-145-5p over-expression on
endometrial fibrosis were assessed. Dual luciferase assay was performed to verify
the relationship between miR-145-5p and zinc finger E-box binding homeobox 2 (ZEB2).
Results
The isolated UCMSC-exos had a typical cup-shaped morphology, expressed the specific
exosomal markers Alix, CD63 and TSG101, and were approximately 50–150 nm in diameter.
TGFβ1 at 10 ng/ml significantly promoted endometrial fibrosis, which was reversed
by 20 µg/ml UCMSC-exos. Exosomal miR-145-5p ameliorated TGFβ1-induced endometrial
fibrosis. ZEB2 was inversely regulated by exosomal miR-145-5p as a direct target.
Conclusions
UCMSC-exos might reverse endometrial stromal cell fibrosis by regulating the miR-145-5p/ZEB2
axis, representing a potential novel strategy to promote endometrial repair.
Keywords
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Biography

Xiao Li is a master's student at the Beijing Obstetrics and Gynecology Hospital, Capital Medical University. Her research interests include clinical diagnosis and treatment and the basic research of uterine diseases.
Key message
Intrauterine adhesions are a kind of endometrial injury disease, and the pathological manifestations are mainly endometrial fibrosis. Umbilical cord mesenchymal stem cell-derived exosomes may reverse endometrial stromal cell fibrosis by regulating the miR-145-5p/ZEB2 axis, representing a potential strategy to promote endometrial repair.
Article info
Publication history
Published online: May 29, 2022
Accepted:
May 24,
2022
Received in revised form:
April 21,
2022
Received:
January 27,
2022
Declaration: The authors report no financial or commercial conflicts of interest.Identification
Copyright
© 2022 Reproductive Healthcare Ltd. Published by Elsevier Ltd. All rights reserved.