Intelligent Hydrogel Delivery System: Ultrasound-Controlled Release for Diabetic Wound Healing

Beyond Passive Dressings: Peking University Team Develops Ultrasound-Responsive Hydrogel for "On-Demand" Smart Therapy of Diabetic Wounds

Beyond Passive Dressings: Peking University Team Develops Ultrasound-Responsive Hydrogel for "On-Demand" Smart Therapy of Diabetic Wounds

1. The Core Challenge: Why Do Diabetic Wounds Heal So Poorly?

Diabetic wounds, particularly foot ulcers, represent a major clinical challenge due to a complex "vicious cycle": a persistent hyperglycemic environment leads to neuropathy, microvascular dysfunction, and chronic inflammation. Conventional treatments often target the wound locally but overlook a key "upstream" regulator—sensory nerves.

Calcitonin gene-related peptide (CGRP), secreted by nerve endings, is a crucial signal that switches the wound from the inflammatory phase to the repair phase. However, diabetic neuropathy and harmful reactive oxygen species (ROS) at the wound site jointly block this vital "neuro-immune communication." Furthermore, standard drugs or dressings lack precise release control, causing active components like CGRP to degrade quickly in the complex wound environment, failing to provide stable, long-term healing effects.

2. The Innovative Solution: Ultrasound-Responsive Intelligent Hydrogel Platform MCF@CA

To address these challenges, a team led by Professor Shumin Wang and Researcher Xiaolong Liang from the Department of Ultrasound at Peking University Third Hospital published a breakthrough study in Advanced Science in January 2026. They designed and constructed an ultrasound-controlled release hydrogel delivery system named MCF@CA, featuring an integrated "four-pronged strategy":

1. "Dual-Effect" Drug System: The team covalently linked CGRP (for neuroimmune regulation) with Manganese Porphyrin (MnP) (for scavenging harmful ROS) to form a single composite molecule (MnP-CGRP), achieving synergistic effects at the source.

2. "Precision-Guided" Targeted Delivery: This composite self-assembles into nanoparticles (MCF NPs), which are then equipped with Folate (FA) targeting ligands on their surface. These ligands specifically recognize inflammatory cells at the wound site, significantly enhancing drug accumulation and delivery efficiency to the lesion.

3. "On-Demand" Ultrasound-Controlled Release: The targeted nanoparticles are loaded into a sodium alginate hydrogel. Upon exposure to external ultrasound, the cross-linked structure of this hydrogel degrades in a controlled manner, enabling precise, on-demand release of the encapsulated drugs. Clinicians can personalize the treatment by adjusting ultrasound parameters (intensity, duration) to control the release rate and dosage based on the wound's specific phase (e.g., acute inflammation vs. granulation), offering unprecedented therapeutic flexibility.

4. "Open and Compatible" Universal Platform: This hydrogel system serves as a foundational carrier that can, in the future, be loaded with various therapeutic agents (e.g., antibiotics, growth factors), paving the way for developing a series of products for different indications. Additionally, the hydrogel is injectable, allowing it to conform perfectly to irregular wound surfaces like joints and toes.

Beyond Passive Dressings: Peking University Team Develops Ultrasound-Responsive Hydrogel for "On-Demand" Smart Therapy of Diabetic Wounds

3. Technical Validation and Efficacy

Experimental results confirmed the excellent biocompatibility of the MCF@CA system. In diabetic animal models, the system demonstrated outstanding wound-healing capabilities:

• Precise Spatiotemporal Control: Achieved through ultrasound, enabling targeted drug release.

• Synergistic Action: Concurrently exerted neuroimmune modulation (promoting CGRP signaling) and ROS scavenging, effectively breaking the inflammatory cycle.

• Enhanced Repair: Significantly accelerated wound closure, promoted angiogenesis, and facilitated organized collagen deposition.

Beyond Passive Dressings: Peking University Team Develops Ultrasound-Responsive Hydrogel for "On-Demand" Smart Therapy of Diabetic Wounds

4. Significance and Future Prospects

This research marks a significant step from "passive covering" to "active intelligent regulation" in diabetic wound therapy. The MCF@CA system integrates diagnosis (ultrasound imaging) and treatment (controlled drug release), providing clinicians with a "smart tool" for real-time intervention.

It not only offers a novel therapeutic approach for chronic diabetic wounds but also, due to its modular and scalable design, holds promise as a universal platform for other hard-to-heal wounds (e.g., burns, venous ulcers). The team suggests that future work should focus on developing a series of products adapted to different scenarios based on this open platform, ultimately enhancing the precision and effectiveness of diabetic wound treatment and reducing amputation risks.

Conclusion: This achievement from the Peking University team is a paradigm of deep integration between materials science, nanomedicine, ultrasound engineering, and clinical medicine. It presents a highly translatable Chinese solution to the global challenge of diabetic foot ulcers.