MicroRNA-98-5p prevents bone regeneration by targeting high mobility group AT-Hook 2

Area of Science:

• Molecular Biology
• Regenerative Medicine
• Biochemistry

Background:

• MicroRNAs (miRNAs) are crucial regulators of gene expression.
• Understanding miRNA roles in bone regeneration is vital for therapeutic development.
• miR-98-5p's specific function in osteogenesis requires elucidation.

Purpose of the Study:

• To investigate the role of miR-98-5p in osteogenic differentiation and bone regeneration.
• To identify the molecular targets and mechanisms underlying miR-98-5p's function.
• To assess the therapeutic potential of modulating miR-98-5p in bone repair.

Main Methods:

• Establishment of three osteoblast cell models: primary human bone marrow mesenchymal stem cells (BMMSC), mouse BMMSC, and MC3T3-E1 cells.
• Quantification of miR-98-5p expression using reverse transcription-quantitative PCR (RT-qPCR).
• Assessment of osteoblast markers (alkaline phosphatase, RUNX2, SP7) via RT-qPCR and Western blot, alongside cell proliferation, apoptosis, and alkaline phosphatase activity assays. Target validation using TargetScan and dual-luciferase reporter assays.

Main Results:

• miR-98-5p expression was downregulated during osteogenic differentiation.
• High mobility group AT-hook 2 (HMGA2) was identified as a direct target of miR-98-5p.
• Upregulation of miR-98-5p inhibited MC3T3-E1 cell osteogenic differentiation, viability, and induced apoptosis, effects reversed by HMGA2 overexpression.

Conclusions:

• miR-98-5p acts as an inhibitor of osteogenic differentiation and osteoblast proliferation.
• The inhibitory effects of miR-98-5p on bone regeneration are mediated through targeting HMGA2.
• Modulating miR-98-5p offers a potential strategy for enhancing bone regeneration therapies.