Abstract
Stem cells are of widespread interest in regenerative medicine due to their capability of self-renewal and differentiation, which is regulated by their three-dimensional microenvironment. In this study, a computer-aided biofabrication technique based on laser-induced forward transfer (LIFT) is used to generate grafts consisting of mesenchymal stem cells (MSCs). We demonstrate that (i) laser printing does not cause any cell damage; (ii) laser-printed MSC grafts can be differentiated toward bone and cartilage; (iii) LIFT allows printing of cell densities high enough for the promotion of chondrogenesis; (iv) with LIFT three-dimensional scaffold-free autologous tissue grafts can be fabricated keeping their predefined structure, and (v) predifferentiated MSCs survived the complete printing procedure and kept their functionality. We believe that our results will find important applications in stem cell biology and tissue engineering.
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