Emerging roles of microRNAs as extracellular vesicle cargo secreted from osteoblasts.

Yuji Yoshiko, Tomoko Minamizaki

Journal of oral biosciences 2020 Sep

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Extracellular vesicles (EVs) have come into the spotlight as messengers, delivering cargo for cell-cell communication. Concomitantly, increasing attention has been focused on microRNAs (miRNAs) as EV cargo. Besides their well-known role in extracellular matrix mineralization, whether matrix vesicles (MVs) - which are in a broad sense a class of EV - also deliver miRNAs to regulate the function of recipient cells remains unclear. We recently found that MVs budding from osteoblasts contain many miRNAs that can be transferred to the bone matrix. Of these, miR-125b was released into the bone marrow microenvironment during bone resorption, where it targeted the transcriptional repressor Prdm1 in osteoclast precursors, resulting in increased expression of anti-osteoclastogenic factors and suppression of osteoclastogenesis, thereby increasing bone mass in mice. Beyond their well-established action in bone mineralization, MVs play a role in the transport of miRNAs from osteoblasts into the bone matrix. Similar to the miR-125b axis in osteoclastogenesis, it seems likely that other miRNAs that accumulate in bone via MV transport may also act as mediators of cell-cell communication in the skeletal system. Copyright © 2020 Japanese Association for Oral Biology. Published by Elsevier B.V. All rights reserved.

Citation

Yuji Yoshiko, Tomoko Minamizaki. Emerging roles of microRNAs as extracellular vesicle cargo secreted from osteoblasts. Journal of oral biosciences. 2020 Sep;62(3):228-234