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Rationale : Chemodynamic therapy (CDT) based on the Fe(II)-mediated Fenton reaction is an emerging tumor treatment strategy. However, the catalytic efficiency in tumors is crucially limited by Fe(II). Herein, an endogenous hydrogen sulfide (H 2 S) accelerated Fe(III)/Fe(II) transformation and photothermal synergistically enhanced CDT strategy based on ellagic acid-Fe-bovine serum albumin (EA-Fe@BSA) nanoparticles (NPs) was developed for colon tumor inhibition. On the one hand, the Fe(III) with low catalytic activity in the EA-Fe@BSA NPs could be rapidly reduced to the highly active Fe(II) by the abundant H 2 S in colon cancer tissues. Thus, a rapid Fe(III)/Fe(II) conversion system was established, wherein highly active Fe(II) ions were continuously regenerated to improve the CDT efficiency. On the other hand, the photothermal effect of EA-Fe@BSA NPs also accelerated the production of hydroxyl radicals (•OH), thereby synergistically enhancing the CDT performance and improving the therapeutic efficacy.   Methods : The endogenous H 2 S accelerated Fe(III)/Fe(II) conversion and PTT enhanced CDT were investigated by characterization of the Fe valence state and detection of •OH.  T  1 -weighted magnetic resonance imaging (MRI) was tested both  in vitro  and  in vivo . The biocompatibility of NPs were examined via MTT assay, hemolysis analysis and routine blood measurements. The enhanced CDT was investigated in HCT116 colon cancer cells by Calcein-AM/PI staining and MTT assay, and tumor inhibition was demonstrated in HCT116 tumor bearing mice.   Results : In this work, EA-Fe@BSA NPs were constructed as a CDT theranostic reagent. The H 2 S accelerated Fe(III)/Fe(II) conversion was confirmed, more degradation of MB and generation of •OH demonstrated the enhanced CDT  in vitro . EA-Fe@BSA NPs exhibited good  T  1 -weighted MRI performance. More importantly, it displayed strong near-infrared (NIR) absorption and excellent photothermal efficiency, further promotes the production of •OH. Hence, the efficacy of CDT was enhanced, and the tumor growth was inhibited efficiently.   Conclusion : All results demonstrate that this strategy based on endogenous H 2 S promoted Fe(III)/Fe(II) transformation together with PTT acceleration permits efficient Fenton-reaction- mediated CDT both  in vitro  and  in vivo , which holds great potential for effective colon cancer theranostics.

theranostics

Ellagic acid-Fe@BSA nanoparticles for endogenous H<sub>2</sub>S accelerated Fe(III)/Fe(II) conversion and photothermal synergistically enhanced chemodynamic therapy

Ellagic acid-Fe@BSA nanoparticles for endogenous H2S accelerated Fe(III)/Fe(II) conversion and photothermal synergistically enhanced chemodynamic therapy

Ellagic acid-Fe@BSA nanoparticles for endogenous H₂S accelerated Fe(III)/Fe(II) conversion and photothermal synergistically enhanced chemodynamic therapy