LncRNA TSIX promotes osteoblast apoptosis in particle-induced osteolysis by down-regulating miR-30a-5p

Area of Science:

• Biomaterials Science
• Orthopedics
• Molecular Biology

Background:

• Particle-induced osteolysis (PIO) is a significant complication following orthopedic implant surgery.
• The molecular mechanisms underlying PIO, particularly the role of non-coding RNAs, require further elucidation.

Purpose of the Study:

• To investigate the role of the TSIX/miR-30a-5p axis in the pathogenesis of particle-induced osteolysis.
• To explore the regulatory relationship between TSIX and miR-30a-5p in osteoblasts.

Main Methods:

• Establishment of a PIO mouse model using Co-Cr-Mo particles (CoPs) and stimulation of MC3T3-E1 cells with CoPs.
• Quantification of bone mineral density (BMD), gene expression (qRT-PCR), and osteoblast apoptosis (flow cytometry).
• Verification of the TSIX-miR-30a-5p interaction using RNA pull-down assays.

Main Results:

• CoPs significantly reduced skull BMD in mice, confirming successful PIO model establishment.
• CoPs upregulated TSIX, downregulated miR-30a-5p, and promoted osteoblast apoptosis in vivo and in vitro.
• TSIX negatively regulated miR-30a-5p, and inhibiting TSIX reduced osteoblast apoptosis, an effect reversed by miR-30a-5p inhibition.

Conclusions:

• The TSIX/miR-30a-5p axis plays a critical role in particle-induced osteolysis.
• TSIX exacerbates PIO by negatively regulating miR-30a-5p, contributing to osteoblast apoptosis and bone loss.