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Iranian Journal of Medical Sciences
Shiraz University of Medical Sciences
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Abstract: |
Background: The therapeutic effect of mesenchymal stem cells
(MSCs) in liver cirrhosis is limited by their entrapment in the
pulmonary vessels. Thus, the use of MSC-derived exosomes
has become a promising strategy. The current work aimed to
compare the role of human umbilical cord blood-MSCs (hUCBMSCs) and their derived exosomes in the alleviation of liver
cirrhosis focusing on the role of miR-23b and miR-221 and their
direct effectors in inflammatory and autophagic pathways.
Methods: Rats were divided into six groups: normal controls
(negative control), liver cirrhosis group (positive control), liver
cirrhotic rats that received conditioned media, liver cirrhotic rats
that received hUCB-MSCs, cirrhotic rats that received exosomes,
and cirrhotic rats that received both hUCB-MSCs and exosomes.
The messenger RNA expression of transforming growth factor-β
(TGF-β), Matrix metalloproteinase 9 (MMP 9), fibronectin,
collagen type-1 (col1), alpha-smooth muscle actin (α-SMA),
Suppressor of Mothers Against Decapentaplegic (SMAD) 2 and 7,
Beclin, P62, and light chain 3 (LC3) were evaluated by quantitative
real-time polymerase chain reaction. Immunohistochemical
staining for Beclin, P62, and LC3 was performed.
Results: The treatment of cirrhotic rats with hUCB-MSCs,
exosomes, or the combination of them significantly downregulated
miRNA-221, fibronectin, collagen I, α-SMA, Smad2 (P<0.001,
for each), and P62 (P=0.032, P<0.001, P<0.001, respectively).
Additionally, the treatment of cirrhotic rats with hUCB-MSCs,
exosomes, or the combination of them significantly upregulated
mTOR, Beclin, LC3, and Smad7 (P<0.001, for each) and miRNA-
23 (P=0.021, P<0.001, P<0.001, respectively).
Conclusion: hUCB-MSCs and their derived exosomes
ameliorated liver cirrhosis by anti-inflammatory and anti-fibrotic
effects besides modulation of autophagy. The exosomes had a
better improvement effect either alone or combined with hUCBMSCs, as proved by improvement in liver function tests, and
molecular, histopathological, and immunohistochemical profiles
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