MC3T3-e1 cell assay on collagen or fibronectin immobilized poly (Lactic acid-ɛ-caprolactone) film

In the present study, collagen (Coll) or fibronectin (FN) was immobilized onto poly(lactic acid)/ - caprolactone (PLCL) copolymer surface and the attachment and proliferation of osteoblast-like cells on Coll or FN immobilized PLCL (Coll-PLCL, FN-PLCL) were evaluated. Coll or FN immobilized PLCL was prepared through a condensation reaction between the carboxylic acid groups on the hydrolyzed PLCL (PLCL-COOH) surface and the amino groups of Coll or FN using water soluble carbodiimide. The contact angle of the PLCLCOOH, Coll-PLCL and FN-PLCL surfaces with respect to double distilled water significantly decreased compared with PLCL (p<0.05). Number of attached cells onto Coll-PLCL or FN-PLCL films was significantly greater than on PLCL films from at the time of 90 min to 7days (p<0.05). The morphological differences of attached osteoblast-like cells were observed between PLCL films and Coll-PLCL or FN-PLCL films at the early stage of cell assay. The cell attached on Coll-PLCL and FN-PLCL films appeared more flat than on PLCL films. Additionally, many actin filaments and stress fibers were observed on Coll-PLCL or FN-PLCL films during 3 and 7 days of cell assay. Actin filaments and stress fibers were few on PLCL films. These data demonstrated the effectiveness of collagen and fibronectin immobilization of PLCL for cell attachment and proliferation. This indicates that collagen or fibronectin immobilization of PLCL films was effective for biological activities of osteoblast-like cells.