MicroRNA-21 affects mechanical force-induced midpalatal suture remodelling.

Abstract:

OBJECTIVES:miR-21 can promote osteoblast differentiation of periodontal ligament stem cells. However, the effect of miR-21 on bone remodelling in the midpalatal suture is unclear. This study aimed to elucidate the effects of miR-21 on the midpalatal suture bone remodelling by expanding the palatal sutures. MATERIALS AND METHODS:miR-21 deficient (miR-21-/- ) and wild-type (WT) mice were used to establish animal models by expanding the palatal sutures. Micro-CT, haematoxylin-eosin (HE) staining, tartrate-resistant acid phosphatase (TRAP) staining, fluorescence labelling and immunohistochemistry were used to investigate the function of miR-21 in midpalatal suture bone remodelling. Besides, bone mesenchymal stem cells (BMSCs) derived from both miR-21-/- and WT mice were cultured. The MTT, CCK8, EdU analysis, transwell and wound healing test were used to assess the effects of miR-21 on the characteristics of cells. RESULTS:The expression of ALP was suppressed in miR-21-/- mice after expansion except 28 days. The expression of Ocn in WT mice was much higher than that of miR-21-/-  mice. Besides, with mechanical force, miR-21 deficiency downregulated the expression of Opg, upregulated the expression of Rankl, and induced more osteoclasts as TRAP staining showed. After injecting agomir-21  to miR-21-/- mice, the expression of Alp, Ocn and Opg/Rankl were rescued. In vitro, the experiments suggested that miR-21 deficiency reduced proliferation and migration ability of BMSCs. CONCLUSIONS:The results showed that miR-21 deficiency reduced the rate of bone formation and prolonged the process of bone formation. miR-21 regulated the bone resorption and osteoclastogenesis by affecting the cell abilities of proliferation and migration.

journal_name

Cell Prolif

journal_title

Cell proliferation

authors

Li M,Zhang Z,Gu X,Jin Y,Feng C,Yang S,Wei F

doi

10.1111/cpr.12697

subject

Has Abstract

pub_date

2020-01-01 00:00:00

pages

e12697

issue

1

eissn

0960-7722

issn

1365-2184

journal_volume

53

pub_type

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