Curcumin-silk tyrosine crosslinked hydrogels
Systemic chemotherapy is still the first-line treatment for cancer, and its associated with toxic side effects, chemoresistance and ultimately cancer recurrence. Rapid gelling hydrogels can overcome this limitation by providing localized delivery of anti-cancer agents to solid tumors. Silk hydrogels are extremely biocompatible and suitable for anticancer drug delivery, but faster gelling formulations are needed. In this study, we introduce a rapid gelling hydrogel formulation (< 3 minutes gelling time) due to chemical crosslinking between silk fibroin and curcumin, initiated by the addition of minute quantities of HRP and H2O2. The novel observation in this study is that curcumin, while being a free-radical scavenger, also participates in accelerating silk di-tyrosine crosslinking in the presence of HRP and H2O2. Using UV-Vis, rheology and time-lapse videos, we convincingly show that curcumin accelerates silk di-tyrosine crosslinking reaction in a concentration-dependent manner, and curcumin remains entrapped in the hydrogel post-crosslinking. FTIR results show an increase in secondary beta-sheet structures within hydrogels, with increasing concentrations of curcumin. Furthermore, we show that curcu-min-silk di-tyrosine hydrogels are toxic to U2OS osteosarcoma cells, and most cancer cells are dead within short time scales of 4 hours post-encapsulation. Graphical abstract O_FIG O_LINKSMALLFIG WIDTH=167 HEIGHT=200 SRC="FIGDIR/small/638374v1_ufig1.gif" ALT="Figure 1"> View larger version (39K): org.highwire.dtl.DTLVardef@19cce86org.highwire.dtl.DTLVardef@1baf69corg.highwire.dtl.DTLVardef@1947dadorg.highwire.dtl.DTLVardef@1c71dfb_HPS_FORMAT_FIGEXP M_FIG C_FIG