Bone morphogenetic protein-mediated type II collagen expression in pilomatricoma and cutaneous mixed tumor.

摘要

Background: We have previously reported that type II collagen deposition in overlying dermo-epidermal junction (DEJ) of pilomatricoma is mediated by bone morphogenetic protein 2/4 (BMP 2/4) expressed by shadow cells (SCs) of pilomatricoma. Objective: This time, we studied the expression of type II collagen and BMP in a large number of cases of pilomatricoma and extended our study to cutaneous mixed tumor (CMT). Results: We found type II collagen deposition in the overlying DEJ (16 of 50 cases) and in the SCs (19/50) of pilomatricoma. The number of case of type II collagen deposition in DEJ (DEJ(+)) and in SCs (SC(+)) of pilomatricoma correlated to the chronological stage of pilomatricoma. We also found type II collagen deposition in overlying DEJ (two of 11) and in the stromal chondroid tissue (four of 11) of CMT. BMP 2 was expressed in most cases of pilomatricoma (37/50) and CMT (seven of 11). Conclusions: The expression of type II collagen in pilomatricoma is dependent upon the chronological stage ofpilomatricoma. Type II collagen expression in the overlying DEJ and chondroid matrix in CMT may be induced by BMP via the same mechanism as in pilomatricoma. Mieno H, Kuroda K, Tajima S. Bone morphogenetic protein-mediated type II collagen expression in pilomatricoma and cutaneous mixed tumor.