Designing Bioactive Hydrogels for In Situ Tissue Regeneration

To achieve improved predictive and therapeutic outcomes, bioactive biomaterials for regenerative medicine are increasingly designed to reconstruct the dynamic cues of the native extracellular matrix (ECM). Polymeric hydrogels are particularly attractive for tissue engineering because their hydrated, soft, and tunable networks can mimic key structural and physicochemical features of biological tissues. Beyond functioning as passive cell carriers, advanced hydrogels can serve as bioactive microenvironments that regulate cell adhesion, growth factor presentation, cytokine signaling, proteolytic remodeling, mechanical properties, and topographical guidance. Nano- and molecular-scale control over hydrogel chemistry, crosslinking, degradation, and biofunctionalization enables spatially and temporally programmed interactions with host tissues. Such design strategies support in situ tissue regeneration by activating endogenous repair mechanisms rather than relying exclusively on exogenous cell transplantation. This presentation will discuss key design principles for bioactive hydrogels that recapitulate or modulate native tissue microenvironments, with particular emphasis on host-responsive matrices, artificial ECM platforms, and their translational potential in regenerative medicine. These approaches provide a versatile framework for developing hydrogel-based nanomedicine systems capable of directing tissue repair and regeneration in vivo.