Mechanotransduction-enhanced bioconstructs fabricated using a bioink comprising collagen and omega-3 fatty acids for gingival tissue regeneration

<b>Rationale:</b> Tissue engineering through three-dimensional (3D) bioprinting has emerged as a highly promising strategy for creating custom-designed 3D bioconstructs that closely mimic native tissue architecture. However, ongoing advancements in bioink formulation and bioprinting processes are required to achieve precise replication of target tissues. In particular, effective vascularization and extracellular remodeling are essential for successful gingival tissue regeneration. <b>Methods:</b> To achieve this, we propose a cell-laden collagen bioink formulation containing omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), for gingival tissue regeneration. To enhance the mechanotransduction of human gingival fibroblasts (hGFs) encapsulated in the bioink, we employed a shear-induced bioprinting process to activate key signaling pathways, including mechanosensitive channels, which are involved in gingival tissue regeneration. <b>Results:</b> Bioprinted cell constructs subjected to both biochemical and biophysical cues exhibited promising gene expression profiles related to collagen production and angiogenesis, demonstrating the potential of integrating bioprinting with mechanical and biochemical stimulation for gingival tissue engineering. Furthermore, when hGF-laden bioconstructs containing EPA/DHA were implanted subcutaneously into mice, the formation of blood vessel-like structures was clearly observed at four weeks post-transplantation. <b>Conclusion:</b> These results suggest that the engineered bioconstruct, incorporating EPA/DHA-assisted bioinks and mechanical stimulation, may offer a promising strategy for gingival tissue regeneration and the development of a 3D biomimetic model within an oral organ-on-a-chip system.