Tissue engineering: from biology to biological substitutes.

Tissue engineering is an emerging multidisciplinary and interdisciplinary field involving the development of bioartificial implants and/or the fostering of tissue remodeling with the purpose of repairing or enhancing tissue or organ function. Bioartificial constructs generally consist of cells and biomaterials, so tissue engineering draws from both cell and biomaterials science and technology. Successful applications require a thorough understanding of the environment experienced by cells in normal tissues and by cells in bioartificial devices before and after implantation. This paper reviews these topics, as well as the current status and future possibilities in the development of different bioartificial constructs, including bioartificial skin, cardiovascular implants, bioartificial pancreas, and encapsulated secretory cells. Issues that need to be addressed in the future are also discussed. These include, but are not limited to, the development of new cell lines and biomaterials, the evaluation of the optimal construct architecture, and the reproducible manufacture and preservation of bioartificial devices until ready for use.

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