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Odontoblasts and/or dental pulp cells are responsible for tooth repair and dentin formation. Furthermore, adhesion and migration are critical processes for tissue regeneration. This study was performed to clarify whether lipopolysaccharide (LPS) modulates adhesion and migration of the murine odontoblast-like cell line MDPC-23, and whether Toll-like receptor 4 (TLR4) signaling is engaged in this process. TLR4 expression in MDPC-23 cells was examined by RT-PCR. Adhesion assay was performed using type I collagen-coated plates. Migration ability was determined by a commercial assay kit. Phosphorylation of IκB-α, FAK, AKT, and ERK was examined by Western blot analysis. TLR4 was functionally expressed in MDPC-23 cells. LPS treatment enhanced adhesion and migration of MDPC-23 cells in a dose-dependent manner. Blockade of TLR4 using its antibody restored LPS-induced adhesion and migration of MDPC-23 cells. These findings indicate that LPS, an immune activator from Gram-negative bacteria, can promote the adhesion and migration ability of MDPC-23 cells via TLR4.

Lipopolysaccharide promotes adhesion and migration of murine dental papilla-derived MDPC-23 cells via TLR4