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miR-490-5p targets FOXP3 to inhibit CLDN14 expression and promote the progression of osteoporotic fractures
Zhou Dong1,2, Zhidong Zhang2, Yonghong Cheng2
1Department of Orthopedic Oncology, The First Affiliated Hospital of Anhui Medical University, Anhui, China.
Introduction:
MicroRNAs (miRNAs) are involved in the pathogenesis of various diseases. Although the role of miR-490-5p in bone-related disorders has been reported, its regulatory mechanism in osteoporotic fractures remains unclear. Therefore, this study aims to investigate the functional mechanism of miR-490-5p in osteoporotic fractures.
Material And Methods:
Human osteoblast cells (hFOB1.19) were induced to undergo differentiation, during which the expression levels of miR-490-5p, forkhead box P3 (FOXP3), and claudin 14 (CLDN14) were quantified using real-time quantitative polymerase chain reaction (RT-qPCR). Osteoporotic animal models and osteoporotic fracture models were established to evaluate miR-490-5p expression. Osteoporosis-related biomarkers were assessed via alkaline phosphatase (ALP) activity assays and commercial assay kits. Rescue experiments were performed to validate the findings.
Results:
miR-490-5p inhibited osteoblast differentiation. It was highly expressed in osteoporotic bone tissue and at the fracture ends of osteoporotic fractures. Mechanistically, miR-490-5p inhibited the expression of FOXP3 by binding to the 3'UTR of FOXP3, thereby suppressing RUNX1 transcriptional activation of CLDN14, leading to the progression of osteoporotic fractures.
Conclusion:
miR-490-5p inhibits RUNX1 transcriptional activation of CLDN14 through FOXP3, promoting the development of osteoporotic fractures.
Insights
MicroRNA-490-5p promotes osteoporotic fractures by inhibiting osteoblast differentiation. It targets FOXP3, suppressing RUNX1 activation of CLDN14, thus worsening fracture progression.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- MicroRNAs (miRNAs) are key regulators in disease pathogenesis.
- The specific role of miR-490-5p in osteoporotic fractures requires elucidation.
- Understanding miR-490-5p's mechanism is crucial for bone disorder research.
Purpose of the Study:
- To investigate the functional mechanism of miR-490-5p in osteoporotic fractures.
- To determine the regulatory pathway involving miR-490-5p, FOXP3, and CLDN14.
- To explore the impact of miR-490-5p on osteoblast differentiation and fracture progression.
Main Methods:
- Quantified miR-490-5p, FOXP3, and CLDN14 expression using RT-qPCR in human osteoblast cells (hFOB1.19).
- Established osteoporotic and osteoporotic fracture animal models to assess miR-490-5p levels.
- Evaluated osteoporosis biomarkers via alkaline phosphatase (ALP) activity and commercial kits; conducted rescue experiments.
Main Results:
- miR-490-5p was highly expressed in osteoporotic bone and fracture sites, inhibiting osteoblast differentiation.
- miR-490-5p directly targets FOXP3's 3'UTR, reducing its expression.
- This leads to suppressed RUNX1 transcriptional activation of CLDN14, promoting osteoporotic fracture progression.
Conclusions:
- miR-490-5p promotes osteoporotic fracture development.
- The mechanism involves inhibiting RUNX1-mediated CLDN14 transcription via FOXP3 suppression.
- This study elucidates a novel molecular pathway contributing to osteoporotic fractures.
