Abstract
In this work, we developed a collagenase-responsive hydrogel system to covalently load cancer immunotherapy candidate cowpea mosaic virus (CPMV) using 3D digital light processing bioprinting technology. CPMV was functionalized with norbornene groups (CPMV-NB), which was then bioprinted into hydrogels with 8-arm polyethylene glycol norbornene and a collagenase-cleavable peptide via photoinduced thiol-ene click chemistry. This strategy enabled stable retention of CPMV-NB within the hydrogels and achieved controlled release of CPMV-NB triggered by collagenase. Furthermore, released CPMV-NB retained its immunogenicity to stimulate immune cells.