Multifunctional Oral Hydrogel Containing Dual‐Active Pt/Mn3O4 Nanozyme for Synergistic Pyroptosis Suppression and Gut Microenvironment Reprogramming to Alleviate Radiation Intestinal Injury

Why It Matters

This integrated approach tackles the three major drivers of radiation intestinal injury—oxidative stress, pyroptosis, and dysbiosis—offering a more comprehensive therapy than conventional antioxidants. Successful translation could improve outcomes for cancer patients undergoing abdominal radiotherapy.

Key Takeaways

• Dual-active Pt/Mn3O4 nanozyme mimics catalase and SOD
• Curcumin induces autophagy, aiding tissue repair
• Hydrogel releases payload selectively in intestine
• Suppresses pyroptosis and restores gut microbiota balance
• Demonstrates preclinical efficacy for radiation intestinal injury

Pulse Analysis

Radiation therapy for abdominal and pelvic cancers often triggers severe intestinal injury, characterized by a cascade of oxidative stress, inflammatory pyroptosis, and disruption of the gut microbiome. Traditional antioxidant regimens address only the excess reactive oxygen species, leaving the underlying cell death pathways and microbial imbalance untouched. This therapeutic gap has driven researchers to explore multifunctional platforms that can intervene at multiple disease nodes, aiming to protect the mucosal barrier while promoting regeneration.

The newly reported PMC@Gel leverages a heterostructured Pt/Mn3O4 nanozyme that exhibits both catalase‑ and superoxide‑dismutase‑like activities, enabling broad‑spectrum ROS elimination. Coupled with curcumin, a natural autophagy activator, the formulation simultaneously suppresses pyroptotic signaling and restores cellular housekeeping mechanisms. Encapsulation within a pH‑responsive sodium alginate/sodium hyaluronate hydrogel provides targeted intestinal delivery, strong mucosal adhesion, and sustained residence time, ensuring that the active agents act precisely where damage occurs.

In preclinical mouse models, oral administration of PMC@Gel led to a dramatic decline in inflammatory cytokines, reduced pyroptotic cell death, and a rebalanced gut microbial community. These effects translated into faster epithelial restitution and improved survival after high‑dose radiation exposure. The study showcases how integrating nanozyme catalysis, autophagy modulation, and microenvironment reprogramming can create a synergistic therapeutic that outperforms single‑mode antioxidants. If clinical trials confirm these findings, the platform could set a new standard for managing radiation‑induced gastrointestinal toxicity and inspire similar multifunctional designs for other complex inflammatory disorders.