| Journal: |
Pharmaceutics 2023, 15, 2149. https://doi.org/10.3390/pharmaceutics15082149
Multidisciplinary Digital Publishing Institute (MDPI)
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| Abstract: |
Chronic kidney disease (CKD), a global health concern, is highly
prevalent among adults. Presently, there are limited therapeutic options to
restore kidney function. This study aimed to inves tigate the therapeutic
potential of breast milk mesenchymal stem cells (Br-MSCs) and their
derived exosomes in CKD. Eighty adult male Sprague Dawley rats were
randomly assigned to one of six groups, including control, nephropathy,
nephropathy + conditioned media (CM), nephropathy + Br-MSCs,
nephropathy + Br-MSCs, nephropathy + Br-MSCs derived exosomes (Br
MSCs-EXOs), and nephropathy + Br-MSCs + Br-MSCs EXOs. Before
administration, Br-MSCs and Br-MSCs-EXOs were isolated, identified,
and labeled with PKH-26. SOX2, Nanog, and OCT3/4expression levels in
Br-MSCs and miR-29b, miR-181, and Let-7b in both Br-MSCs and Br
MSCs-EXOs were assayed. Twelve weeks after transplantation, renal
function tests, oxidative stress, expression of the long non-coding RNA
SNHG-7, autophagy, fibrosis, and ex pression of profibrotic miR-34a and
antifibrotic miR-29b, miR-181, and Let-7b were measured in renal tissues.
Immunohistochemical analysis for renal Beclin-1, LC3-II, and P62,
Masson trichome staining, and histopathological examination of kidney
tissues were also performed. The results showed that Br-MSCs expressed
SOX2, Nanog, and OCT3/4, while both Br-MSCs and Br-MSCs-EXOs
expressed antifibrotic miR-181, miR-29b, and Let-7b, with higher
expression levels in exosomes than in Br-MSCs. Interestingly, the
administration of Br-MSCs + EXOs, EXOs, and Br-MSCs improved renal
function tests, reduced renal oxidative stress, upregulated the renal
expression of SNHG-7, AMPK, ULK-1, Beclin-1, LC3, miR-29b, miR
181, Let-7b, and Smad-7, downregulated the renal expression of miR-34a,
AKT, mTOR,P62, TGF-β, Smad-3, and Coli-1, and ameliorated renal
pathology. Thus, Br-MSCs and/or their derived exosomes appear to reduce
adenine-induced renal damage by secreting antifibrotic microRNAs and
potentiate renal autophagy by modulating SNHG-7 expression.
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