Open Access
ARTICLE
Exosomes derived from osteoclasts under compression stress inhibit osteoblast differentiation
YUE WANG, YUNFEI ZHENG*, WEIRAN LI*
Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 10081, China
* Address correspondence to: Yunfei Zheng, ; Weiran Li,
BIOCELL 2021, 45(2), 427-444. https://doi.org/10.32604/biocell.2021.013960
Received 27 August 2020; Accepted 09 November 2020; Issue published 19 February 2021
Abstract
Orthodontic tooth movement is triggered by orthodontic force loading on the periodontal ligament and is
achieved by alveolar bone remodeling, which is regulated by intimate crosstalk between osteoclastogenesis and
osteoblast differentiation. Whether the communication between osteoclasts and osteoblasts is influenced by
orthodontic compression stress requires further clarification. In this study, osteoclasts were differentiated for 10 days.
On day 4 of differentiation, the number of pre-osteoclasts peaked, as determined by the increased expression of
RANK and the number of multinucleated cells. After 24 h of compression stress loading, on day 4, the number of
osteoclasts increased, and the optimal magnitude of stress to promote osteoclastogenesis was determined as 1 g/cm2.
Moreover, the results of RNA-sequencing analysis showed that the miRNA expression profile changed markedly after
compression loading and that many of the altered miRNAs were associated with cell communication functions. A
series of indirect co-culture experiments showed an inhibitory effect of osteoclasts on osteoblast differentiation,
especially after compression. Next, we added osteoclast-derived exosomes to hPDLSCs during osteoblast
differentiation. Exosomes derived from osteoclasts under compression (cEXO) showed a greater inhibitory effect on
osteoblast differentiation, compared to exosomes from osteoclasts without compression (EXO). Therefore, we
analyzed differentially expressed miRNAs associated with bone development functions in exosomes: miR-223-5p and
miR-181a-5p were downregulated, whereas miR-133a-3p, miR-203a-3p, miR-106a-5p, and miR-331-3p were
upregulated; these altered expressions may explain the enhanced inhibitory effect of compression stress.
Keywords
Cite This Article
WANG, Y., ZHENG, Y., LI, W. (2021). Exosomes derived from osteoclasts under compression stress inhibit osteoblast differentiation.
BIOCELL, 45(2), 427–444. https://doi.org/10.32604/biocell.2021.013960
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