Retinoic acid effects on an SV-40 large T antigen immortalized adult rat bone cell line

✍ Scribed by Marie-Helene Lafage-Proust; Gregg Wesolowski; Matthias Ernst; Gideon A. Rodan; Sevgi B. Rodan

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 237 KB
• Volume: 179
• Category: Article
• ISSN: 0021-9541
• DOI: 10.1002/(sici)1097-4652(199906)179:3<267::aid-jcp4>3.0.co;2-0

✦ Synopsis

Clonal cell lines were established from adult rat tibia cells immortalized with SV-40 large T antigen. One clone (TRAB-11), in which retinoic acid (RA) induced alkaline phosphatase (AP) activity, was selected for further study. The TRAB-11 cells express high levels of type I collagen mRNA, type IV collagen, fibronectin, practically no type III collagen, little osteopontin, and no osteocalcin. RA stimulates proliferation of TRAB-11 cells (starting at 10 pM) and survival (starting at 100 pM). TRAB-11 cells synthesize fibroblast growth factor-2 (FGF-2), which has potent autocrine mitogenic effects on these cells and acts synergistically with RA. TRAB-11 cells attach better to type IV collagen than to fibronectin or laminin. Cell attachment to type IV collagen is increased by RA and decreased (65%) by an antibody directed against ␣ 1 ␤ 1 integrin. RA up-regulates steady-state levels of ␣ 1 mRNA without affecting ␤ 1 mRNA expression. In conclusion, we report the establishment of a clonal cell line from the outgrowth of adult rat tibiae which is highly sensitive to RA in its growth and survival in culture, apparently as a result of integrin-mediated cell interaction with extracellular matrix proteins.