Bioinspired and stimuli-responsive hydrogels for regenerative medicine: design principles and clinical translation.

Stimuli-responsive and bioinspired hydrogels have become the new promising biomaterials in regenerative medicine as they are capable of dynamically recreating the extracellular matrix (ECM) and reacting to physiological stimuli. Compared to traditional stationary scaffolds, these hydrogels combine bioinspired structural design with endogenous stimulus response, including pH, temperature, redox, and enzyme activity to allow adaptive mechanical response, targeted therapeutic release, and cell-instructive microenvironment. Though much research has shown potential preclinical efficacy in tissue engineering, wound healing and drug delivery, clinical implementation has been hampered by such factors as long term biocompatibility, mechanical instability, scalability of manufacturing, and regulatory complexity. This will be a critical review of the current developments in the design principles of hydrogel, molecular functionalization concepts, and multi-stimuli-responsive principles with specific consideration on how these characteristics can be applied to translational potential. Moreover, the new fabrication technologies, such as 3D and 4D bioprinting, are mentioned as the tools to allow spatially and temporally programmable hydrogel systems. The article offers a framework of translationally focused research, which also identifies the potential and constraints of bioinspired and stimuli-responsive hydrogels by combining material design with fabrication approaches and clinical aspects, providing a pathway toward the creation of clinically viable regenerative therapies.