Abstract
The bacteria that invade the periapical tissue of teeth can directly damage tissue cells such as periapical fibroblasts, leading to an inflammatory response in the periapical tissue and ultimately resulting in bone destruction. We investigated the role of fibroblast activation protein α (FAPα) and integrin α5 (ITGA5) in periapical bone destruction. This study found that FAPα and ITGA5 were highly expressed in human tissues from patients with chronic apical periodontitis. Osteoclast differentiation decreased when FAPα or ITGA5 was silenced and inhibited. The results of protein molecular docking showed that FAPα had good binding affinity to ITGA5, and its free energy was −14.5 kcal/mol. Immunofluorescence staining and co-immunoprecipitation showed that FAPα and ITGA5 formed protein complexes in the inflammatory microenvironment. In conclusion, this study proved that FAPα and ITGA5 participate in the regulation of osteoclast differentiation by forming protein complexes in the inflammatory microenvironment, which then regulates the occurrence and development of chronic apical periodontitis.
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