Amphiregulin Induces Proliferative Activities in Osseous Dysplasia

Abstract

Human osseous dysplasia (OD) is a benign fibro-osseous neoplasm of periodontal ligament origin in which normal bone is replaced with fibrous connective tissue containing abnormal bone or cementum. However, cellular differentiation and proliferation in OD have not been fully elucidated. In vitro culture systems have distinct advantages for analytical studies. Therefore, we established immortalized cell lines (OD-1) from OD lesions of the jaw from an individual with gnathodiaphyseal dysplasia (GDD). We hypothesized that OD-1 had a characteristic growth mechanism different from that of mineralized-associated cells such as osteoblasts. To clarify the difference of gene expression patterns between OD-1 and osteoblasts, we compared the profiles of genes expressed in the 2 cell types by microarray analysis. We identified amphiregulin to be highly expressed in OD-1 compared with osteoblasts and gingival fibroblasts. OD-1 showed proliferative activities regulated in an autocrine manner by amphiregulin, and amphiregulin may play a significant role in the proliferation of OD.

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