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Osteopontin involvement in integrin‐mediated cell signaling and regulation of expression of alkaline phosphatase during early differentiation of UMR cells
Author(s) -
Liu Yin-Kun,
Uemura Toshimasa,
Nemoto Atsuko,
Yabe Tomoko,
Fujii Noriko,
Ushida Takashi,
Tateishi Tetsuya
Publication year - 1997
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(97)01498-1
Subject(s) - osteopontin , autophosphorylation , alkaline phosphatase , signal transduction , microbiology and biotechnology , vitronectin , osteoblast , integrin , chemistry , cellular differentiation , phosphorylation , biology , cell , biochemistry , endocrinology , protein kinase a , enzyme , in vitro , gene
To clarify the function of osteopontin in osteoblast differentiation, we have examined the signal transduction pathway in an osteoblastic cell line (UMR106‐6) bound to osteopontin, fibronectin, vitronectin and collagen type I surfaces. This was done by investigating the production and autophosphorylation of focal adhesion kinase (FAK) and the expression of alkaline phosphatase (ALP) at the transcription level. Results suggest that osteopontin was not only responsible for the autophosphorylation of FAK but regulated the expression of ALP, which was strongly correlated with FAK activity. These results suggest that osteopontin might act as a trigger in the early differentiation of osteoblasts.