Electrostatic self-assembly of multilayer copolymeric membranes on the surface of porous tantalum implants for sustained release of doxorubicin

Abstract

Many studies in recent years have focused on surface engineering of implant materials in order to improve their biocompatibility and other performance. Porous tantalum implants have increasingly been used in implant surgeries, due to their biocompatibility, physical stability, and good mechanical strength. In this study we functionalized the porous tantalum implant for sustained drug delivery capability via electrostatic self-assembly of polyelectrolytes of hyaluronic acid, methylated collagen, and terpolymer on the surface of a porous tantalum implant. The anticancer drug doxorubicin was encapsulated into the multilayer copolymer membranes on the porous tantalum implants. Results showed the sustained released of doxorubicin from the functionalized porous tantalum implants for up to 1 month. The drug release solutions in 1 month all had inhibitory effects on the proliferation of chondrosarcoma cell line SW1353. These results suggest that this functionalized implant could be used in reconstructive surgery for the treatment of bone tumor as a local, sustained drug delivery system.

Keywords:

• self-assembly
• surface modification
• tantalum
• drug delivery system
• doxorubicin
• bone tumor

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 30571892, u0732001) and the Danish Research Council (Jr.nr. 09-063120). Type I bovine collagen was supplied courtesy of Professor Yingjun Wang, the Key Lab for Special Functional Materials of the Ministry of Education, South China University of Technology, China.

Disclosure

The authors disclose no conflicts of interest in this work.