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JOURNAL ARTICLE
REVIEW

Inflammation in tissue engineering: The Janus between engraftment and rejection

Annunziata Crupi, Alessandra Costa, Attila Tarnok, Susanne Melzer, Laura Teodori
European Journal of Immunology 2015, 45 (12): 3222-36
26558332
Tissue engineering (TE) for tissue and organ regeneration or replacement is generally performed with scaffold implants, which provide structural and molecular support to in vitro seeded or in vivo recruited cells. TE implants elicit the host immune response, often resulting in engraftment impediment or rejection. Besides this negative effect, however, the immune system components also yield a positive influence on stem cell recruitment and differentiation, allowing tissue regeneration and healing. Thus, a balanced cooperation between proinflammatory and proresolution players of the immune response is an essential element of implant success. In this context, macrophage plasticity plays a fundamental role. Therefore modulating the immune response, instead of immune suppressing the host, might be the best way to successfully implant TE tissues or organs. In particular, it is becoming evident that the scaffold, immune, and stem cells are linked by a three-way interaction, and many efforts are being made for scaffold-appropriate design and functionalization in order to drive the inflammation process toward regeneration, vascularization, and implant success. This review discusses current and potential strategies for inflammation modulation to aid engraftment and regeneration, supporting the concept that quality, and not quantity, of inflammation might influence implant success.

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