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Published on: May 4, 2018
miR‑27a‑3p negatively regulates osteogenic differentiation of MC3T3‑E1 preosteoblasts by targeting osterix
Yuexin Xu1, Dong Li2, Zhu Zhu1
1Research Institute of Stomatology, Nanjing Medical University, Stomatological Hospital of Jiangsu Province, Nanjing, Jiangsu 210029, P.R. China.
Abstract:
Osteoporosis is a complex multifactorial disorder characterized by microarchitectural deterioration, low bone mass, and increased risk of fractures or broken bones. Balanced bone remodeling is tightly regulated by the differentiation, activity and apoptosis of bone‑forming osteoblasts and bone‑resorbing osteoclasts. MicroRNAs (miRs) are dysregulated in osteoporosis, but whether they control osteogenic differentiation and skeletal biology, or could serve as therapeutic targets remains to be elucidated. The present study identified miR‑27a‑3p as a critical suppressor of osteoblastogenesis. Bioinformatics analysis and luciferase reporter assays demonstrated that miR‑27a‑3p directly targeted and controlled the expression of osterix (Osx), an early response gene essential for bone formation, through its 3'‑untranslated region. miR‑27a‑3p functionally inhibited the differentiation of preosteoblasts by decreasing Osx expression, which synergistically contributed to bone formation. miR‑27a‑3p level was significantly decreased during osteogenic differentiation and increased in the serum of patients with osteoporosis. Together, miR‑27a‑3p contributed to diminished osteogenic function during osteogenic differentiation and might thus serve as a therapeutic target and diagnostic biomarker for osteoporosis.
Insights
MicroRNA-27a-3p suppresses osteoblast differentiation by targeting Osterix, a key gene in bone formation. Lower levels of this microRNA are linked to osteoporosis, suggesting its potential as a therapeutic target.
Area of Science:
- Biochemistry
- Molecular Biology
- Skeletal Biology
Background:
- Osteoporosis is a bone disorder characterized by low bone mass and deterioration of bone microarchitecture, increasing fracture risk.
- Bone remodeling, crucial for skeletal health, involves a delicate balance between osteoblasts and osteoclast activity.
- MicroRNAs (miRNAs) are implicated in osteoporosis pathogenesis, but their specific roles in osteogenic differentiation and potential as therapeutic targets require further investigation.
Purpose of the Study:
- To investigate the role of miR-27a-3p in osteogenic differentiation and its potential as a therapeutic target or diagnostic biomarker for osteoporosis.
Main Methods:
- Bioinformatics analysis to predict miRNA targets.
- Luciferase reporter assays to validate direct targeting of Osterix (Osx) by miR-27a-3p.
- In vitro studies assessing the effect of miR-27a-3p on preosteoblast differentiation and Osx expression.
- Measurement of miR-27a-3p levels in osteogenic differentiation models and serum from osteoporosis patients.
Main Results:
- miR-27a-3p was identified as a critical suppressor of osteoblastogenesis.
- miR-27a-3p directly targets and regulates the expression of Osterix (Osx), an essential gene for bone formation.
- Overexpression of miR-27a-3p inhibited preosteoblast differentiation by reducing Osx levels.
- miR-27a-3p levels decreased during osteogenic differentiation but increased in the serum of osteoporosis patients.
Conclusions:
- miR-27a-3p plays a significant role in suppressing osteogenic differentiation by inhibiting Osx expression.
- The dysregulation of miR-27a-3p contributes to diminished osteogenic function in osteoporosis.
- miR-27a-3p holds promise as a potential therapeutic target and diagnostic biomarker for osteoporosis.
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