Collageneous matrix coatings on titanium implants modified with decorin and chondroitin sulfate: characterization and influence on osteoblastic cells.
Studies in developmental and cell biology have established the fact that responses of cells are influenced to a large degree by morphology and composition of the extracellular matrix. Goal of this work is to use this basic principle to improve the biological acceptance of implants by modifying the surfaces with components of the extracellular matrix (ECM), utilizing the natural self-assembly potential of collagen in combination with further ECM components in close analogy to the situation in vivo. Aiming at load-bearing applications in bone contact, collagen type I in combination with the proteoglycan decorin and the glycosaminoglycan chondroitin sulfate (CS) was used; fibrillogenesis, fibril morphology, and adsorption of differently composed fibrils onto titanium were assessed. Both decorin and CS could be integrated into the fibrils during fibrillogenesis, the amount bound respectively desorbed depending on the ionic strength of fibrillogenesis buffer. Including decorin always resulted in a significant decrease of fibril diameter, CS in only a slight decrease or even increase, depending on the collagen preparation used. No significant changes in adsorption to titanium could be detected. Osteoblastic cells showed different reactions for cytoskeletal arrangement and osteopontin expression depending on the composition of the ECM, with CS enhancing the osteoblast phenotype.
Max Bergmann Center for Biomaterials, Institute of Materials Science, Dresden University of Technology, Dresden, Germany. Susanne.Bierbaum@mailbox.tu-dresden.de
Susanne
S
Bierbaum
Timothy
T
Douglas
Thomas
T
Hanke
Dieter
D
Scharnweber
Sonja
S
Tippelt
Thomas K
TK
Monsees
Richard H W
RH
Funk
Hartmut
H
Worch
D000818:Animals; D002417:Cattle; D002809:Chondroitin Sulfates; D020099:Coated Materials, Biocompatible; D003094:Collagen / Q000648:ultrastructure; D058575:Decorin; D016326:Extracellular Matrix Proteins; D010006:Osteoblasts; D019736:Prostheses and Implants; D011509:Proteoglycans; D051381:Rats; D014025:Titanium
D020099:Coated Materials, Biocompatible; D058575:Decorin; D016326:Extracellular Matrix Proteins; D011509:Proteoglycans; D002809:Chondroitin Sulfates; D003094:Collagen; D014025:Titanium