miR-145-5p suppresses osteogenic differentiation of adipose-derived stem cells by targeting semaphorin 3A

Area of Science:

• Biomedical Engineering
• Stem Cell Biology
• Molecular Biology

Background:

• Adipose-derived stem cells (ADSCs) are promising for bone regeneration but prone to fat differentiation.
• MicroRNAs (miRNAs) regulate stem cell fate, yet their role in ADSC-based bone regeneration requires further elucidation.

Purpose of the Study:

• To investigate the role of miR-145-5p in regulating ADSC differentiation and bone regeneration.
• To identify the downstream targets and signaling pathways affected by miR-145-5p.

Main Methods:

• Quantitative real-time PCR (qRT-PCR) and Western blotting to assess gene and protein expression.
• Luciferase activity assay to confirm miRNA targeting.
• Cell migration and proliferation assays (wound healing, Transwell, CCK-8, Ki-67).
• RNA interference (siRNA) to modulate gene expression.
• Immunofluorescence to analyze signaling pathways.

Main Results:

• Inhibition of miR-145-5p significantly enhanced osteogenic differentiation and suppressed adipogenic differentiation of ADSCs.
• Semaphorin 3A (Sema3A) was identified as a direct target of miR-145-5p.
• miR-145-5p inhibition promoted ADSC migration but not proliferation.
• Sema3A knockdown mimicked and rescued the effects of miR-145-5p inhibition.
• miR-145-5p activated the Wnt signaling pathway, promoting osteogenic differentiation.

Conclusions:

• miR-145-5p plays a crucial role in suppressing osteogenic differentiation of ADSCs, partly via targeting Sema3A.
• Modulating miR-145-5p and its target Sema3A offers a potential therapeutic strategy to enhance ADSC-based bone regeneration.