Preparation and characterization of RGD-immobilized chitosan scaffolds.
Chitosan scaffolds were modified with RGDS (Arg-Gly-Asp-Ser) in the present work via an imide-bond forming reaction between amino groups in chitosan and carboxyl groups in peptides. Successful immobilization was verified with FTIR spectroscopy, and the immobilized amount was determined to be on the order of 10(-12) mol/cm2 through analysis of the immobilized amino acids. Results of experiments of cell culture with rat osteosarcoma (ROS) cells demonstrated that RGDS immobilization could enhance the attachment of ROS cells onto the chitosan, resulting in higher cell density attached to the RGDS-modified scaffold than to the unmodified scaffold. It should be noted that only RGDS, but not other peptide such as RGES, is effective in enhancing cell attachment and possible proliferation. Experiments of in vitro mineralization indicated that there were more cells on the RGDS-modified scaffold than on the unmodified scaffold, which tended to form bone-like tissues. The results presented in this work suggest that immobilization of RGDS can make chitosan scaffolds more compatible for the culture of osteoblast-like cells and the regeneration of bone-like tissues.
Ho
Ming-Hua
MH
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan.
Wang
Da-Ming
DM
Hsieh
Hsyue-Jen
HJ
Liu
Hwa-Chang
HC
Hsien
Tzu-Yang
TY
Lai
Juin-Yih
JY
Hou
Lein-Tuan
LT
D000596:Amino Acids / Q000737:chemistry; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D001842:Bone and Bones / Q000166:cytology; D018929:Cell Culture Techniques / Q000379:methods*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002478:Cells, Cultured; D002686:Chitin / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry* / Q000378:metabolism; D046508:Culture Techniques; D007150:Immunohistochemistry; D008855:Microscopy, Electron, Scanning; D009842:Oligopeptides / Q000737:chemistry*; D010006:Osteoblasts / Q000166:cytology / Q000378:metabolism; D012516:Osteosarcoma; D010455:Peptides / Q000737:chemistry; D051381:Rats; D013055:Spectrophotometry, Infrared; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013997:Time Factors; D023822:Tissue Engineering / Q000379:methods
D000596:Amino Acids; D001672:Biocompatible Materials; D009842:Oligopeptides; D010455:Peptides; D002686:Chitin; C047981:arginyl-glycyl-aspartic acid; D048271:Chitosan