The fibroblast of radicular cyst facilitate osteoclastogenesis via the autocrine of Fibronectin containing extra domain A.

The microenvironment of the fibrous capsule of radicular cysts facilitates the splicing of EDA exon, it endues EDA + FN with autocrine effects on fibroblast itself, and it increases the expression of osteoclastogenesis-related genes, by which the osteoclastogenesis in radicular cysts could be initiated.