MiR-99b-5p suppressed proliferation of human osteoblasts by targeting FGFR3 in osteoporosis

Area of Science:

• Biomedical Science
• Molecular Biology
• Skeletal Biology

Background:

• Osteoporosis is a skeletal disease marked by decreased bone mass, stemming from imbalanced bone resorption and formation.
• MicroRNAs (miRNAs) are increasingly recognized for their potential involvement in osteoporosis pathogenesis.

Purpose of the Study:

• To identify deregulated miRNAs implicated in osteoporosis.
• To elucidate the functional role of the identified miRNA/mRNA axis in osteoblast activity and bone formation.

Main Methods:

• Analysis of online datasets for differentially expressed miRNAs in osteoporosis.
• Prediction and pathway enrichment analysis of miRNA target genes.
• In vitro experiments assessing the effects of miR-99b-5p and FGFR3 on osteoblast proliferation and gene expression.
• Validation of direct targeting and functional reversal experiments.

Main Results:

• The miR-99b-5p/FGFR3 axis was identified as a key player in osteoporosis.
• miR-99b-5p was upregulated, while FGFR3 was downregulated in osteoporosis bone tissues.
• miR-99b-5p overexpression inhibited osteoblast proliferation and osteogenesis, whereas FGFR3 overexpression promoted them.
• miR-99b-5p directly targets and inhibits FGFR3, impacting osteoblast function.

Conclusions:

• The miR-99b-5p/FGFR3 axis is a critical regulator of osteoblast proliferation and activity in osteoporosis.
• Targeting FGFR3 by miR-99b-5p contributes to reduced bone formation in osteoporosis progression.
• This axis represents a potential therapeutic target for osteoporosis treatment.