A universal gelation strategy of bivalent anions to construct
nanofibrous lysozyme hydrogels for immunomemory anti-recurrence of
diabetic wound infection by activating cGAS-STING pathway
Abstract
Antibacterial lysozyme hydrogels show attractive advantages in wound
dressings due to their intrinsic antibacterial activity, excellent
biochemical and mechanical properties. Unfortunately, the development of
such hydrogels is still greatly limited due to the lack of universal
gelation strategies. Herein, a universal gelation strategy between
lysozyme-nanofiber (LZF) and inorganic salts is proposed for the first
time to construct functional nanofibrous lysozyme-based hydrogels.
Specially, divalent anions are found to universally drive LZF for the
aggregation and transformation into three-dimensional nanofibrous
network hydrogels via electrostatic interaction, and the key role of
divalent anions in the gelation is further proved by molecular dynamics
simulation. In addition, near infrared light-mediated photothermal
characteristics are endowed for LZF to enhance its inhibitory activity
of multi-drug-resistant bacteria by the skeleton modification with
genipin to produce genipin-conjuagted LZF (GLZF). As a distinct
application paradigm, the brilliant immunomemory MnSO
4-crosslinked GLZF hydrogel is constructed to sensitize
cGAS-STING pathway and skillfully establish an antibacterial immune
microenvironment. It can excellently realize the infected
anti-recurrence of diabetic wound via photo-enhanced bacterial killing
and cGAS-STING pathway. Thereby, it paves the way to employ the
universal divalent anion-mediated gelation strategy for future
developing functional inorganic salt-hybrided lysozyme hydrogels.