Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (26): 4112-4117.doi: 10.12307/2021.107

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MicroRNA-98-5p promotes osteoblast proliferation and differentiation: possibilities and mechanisms

Zheng Feng, Zhang Fucai, Xu Zhe   

  1. Department of Orthopedics, Qinghai Provincial People’s Hospital, Xining 810007, Qinghai Province, China
  • Received:2020-09-11 Revised:2020-09-12 Accepted:2020-10-30 Online:2021-09-18 Published:2021-04-19
  • Contact: Zheng Feng, Department of Orthopedics, Qinghai Provincial People’s Hospital, Xining 810007, Qinghai Province, China
  • About author:Zheng Feng, Master, Chief physician, Department of Orthopedics, Qinghai Provincial People’s Hospital, Xining 810007, Qinghai Province, China
  • Supported by:
    the Basic Research Plan of Qinghai Province, No. 2020-ZJ-755 (to ZF)

Abstract:

BACKGROUND: MicroRNA-98-5p (miR-98-5p) can inhibit the high mobility group AT-HOOK 2 (HMGA2). The phosphatidylinositol 3-kinase/alkaline phosphatase/glycogen synthase kinase-3β (PI3K/AKT/GSK-3β) signaling pathway is involved in cell proliferation. During the fracture healing process, it is unclear whether miR-98-5p can act on the PI3K/Akt/GSK-3β pathway by activating HMGA2 to promote the proliferation of osteoblasts.

OBJECTIVE: To investigate the mechanisms of microRNA-98-5p (miR-98-5p) in promoting osteoblast proliferation and differentiation by regulating HMGA2 and PI3K/Akt/GSK-3β pathway. 
METHODS: MC3T3-E1 cells transfected with miR-98-5p mimics and HMGA2 plasmid by Lipofectamine 2000 were divided into a miR-98-5p mimics group and a HMGA2 overexpression group, respectively. MC3T3-E1 cells transfected with dimethyl sulfoxide and scrambled plasmids were divided into a mimic control group and a scramble group. Cells transiently transfected with miR-98-5p inhibitor using liposomes were as a miR-98-5p inhibitor group. Normal MC3T3-E1 cells without treatment were used as a blank control group. 
RESULTS AND CONCLUSION: There were no significant differences in HMGA2, PI3K/Akt/GSK-3β, alkaline phosphatase activity and mRNA level between the blank control group and the mimic control group. Compared with the mimic control group, the HMGA2 and PI3K/Akt/GSK-3β protein expression, cell differentiation and proliferation, alkaline phosphatase activity and mRNA level were significantly reduced in the miR-98-5p mimics group. The interaction between miR-98-5p and HMGA2 predicted by Targetscan7.1 showed that compared with the mimic control group, the HMGA2 protein and mRNA were reduced in the miR-98-5p mimic group, while compared with the miR-98-5p mimic group, the HMGA2 protein and mRNA had an increase in the miR-98-5p inhibitor group. There were no significant differences in osteoblast proliferation, alkaline phosphatase activity and mRNA between the blank control group and the scramble group. Compared with the scramble group, the PI3K/Akt/GSK-3β expression, cell differentiation and proliferation, alkaline phosphatase activity and mRNA in the HMGA2 overexpression group were significantly increased. To conclude, miR-98-5p can inhibit the HMGA2 and PI3K/Akt/GSK-3β expressions in MC3T3-E1 cells, inhibit cell proliferation and differentiation. HMGA2 is possible the direct target of miR-98-5p.

Key words: osteoblasts, microRNA-98-5p, high mobility group AT-HOOK 2, phosphatidylinositol 3-kinase, protein kinase B, glycogen synthase kinase 3β, transfection, MC3T3-E1 cells, proliferation, differentiation

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