eISSN: 1896-9151
ISSN: 1734-1922
Archives of Medical Science
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6/2020
vol. 16
 
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Orthopedics and traumatology
abstract:
Basic research

Inhibition of miR-22 promotes differentiation of osteoblasts and improves bone formation via the YWHAZ pathway in experimental mice

Peiyi Yin
1
,
Qingming Shi
1
,
Fan Xiao
2
,
Biao Zhao
1
,
Wang Yu
1
,
Kai Wu
1
,
Kun Peng
1

1.
Department of Orthopedics, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
2.
Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
Arch Med Sci 2020; 16 (6): 1419–1431
Online publish date: 2019/11/25
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Introduction
In senile osteoporosis countering the age-mediated bone loss, promotion of osteoblastogenesis and identification of responsible micro-RNA (miR) would be a successful strategy.

Material and methods
miR microarray screening was carried out to identify the suppressed miRs after real time polymerase chain reaction (RT-PCR) analysis in mesenchymal stem cells (MSCs) derived from adult bone marrow during the proliferation to the mineralization stage. The primary calvarial pre-osteoblasts (human) were harvested and received transfection of miR-22’s antagomir or agomir in vitro. Bioinformatics study suggested YWHAZ as the favorable target gene. Next, YWHAZ knockdown was studied for its effect on differentiation of osteoblasts. For in vivo studies, ovariectomized or sham mice were injected with miR-22’s antagomir for a period of 6 weeks. The stromal cells were isolated in the 6th week for ex vivo experiments.

Results
miR-22 was found to be down-regulated in bone marrow derived mesenchymal stem cells. miR-22’s antagomir converted the pre-osteoblasts to a more differentiated and mineralized phenotype showing upregulated protein expression of COL1A1, ALP and CBFA1. The miR-22’s antagomir suppressed YWHAZ, enhanced stability of CBFA1 and promoted the differentiation of osteoblasts. In vivo, miR-22’s antagomir promoted mineralization and osteoblastogenesis, elevated bone strength and reversed the ovariectomy mediated bone loss in sham mice.

Conclusions
Inhibition of miR-22 may be a potential target for treating osteoporosis clinically. The findings hence suggest that inhibition of miR-22 may be an effective anabolic therapeutic approach in treating osteoporosis clinically.

keywords:

miR-22, osteoporosis, ovariectomized, COL1A1, ALP, CBFA1

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