miR-146a Protects against Staphylococcus aureus-Induced Osteomyelitis by Regulating Inflammation and Osteogenesis.

Osteomyelitis is a Staphylococcus aureus-caused bone infection. In this study, the effects of miR-146a on osteomyelitis were evaluated. Using the osteoblast cell model and S. aureus-induced osteomyelitis mice model, we monitored the miR-146 expression and explored the effects of miR-146a on cell proliferation of osteoblasts, bone remodeling, osteoclastogenesis, inflammatory cytokine production, and bacterial burden. Upregulated miR-146a was found in mice with S. aureus-induced osteomyelitis. miR-146a attenuated S. aureus-induced cell loss of osteoblasts, rescued the expression of osteogenic markers, altered the bone remodeling, and inhibited inflammatory cytokine production and osteoclastogenesis. miR-146a knockout mice had higher S. aureus burden. In conclusion, miR-146a protects against S. aureus-induced osteomyelitis by regulating inflammation and osteogenesis.