Managing diabetic drug-resistant infections remains a critical challenge due to systemic immunosuppression and the proliferation of MRSA. Therefore, researchers engineered peroxidase (POD)-like nanoassemblies, designated as DC/Cu, to address these complex clinical scenarios. These innovative assemblies integrate antibacterial, anti-inflammatory, and tissue-reparative functionalities into a single platform. Specifically, the team utilized copper-coordinated self-assembly to combine ε-poly(L-lysine)-derived carbon dots with diclofenac sodium.

The cationic DC/Cu nanoassemblies demonstrate a high affinity for bacterial membranes. Consequently, they enable microenvironment-responsive drug release directly at the site of infection. Moreover, the POD-like activity of the carbon dots catalyzes endogenous hydrogen peroxide to induce membrane lipid peroxidation. This biochemical process significantly increases membrane permeability, which subsequently facilitates a massive influx of copper ions into the bacterial cell.

Addressing Diabetic Drug-Resistant Infections with Cuproptosis

Intracellular copper overload disrupts the tricarboxylic acid cycle and effectively inhibits Fe-S cluster proteins within the pathogen. This lethal self-cascade activates a unique cuproptosis-like death pathway in multidrug-resistant bacteria. Simultaneously, the released diclofenac sodium helps to mitigate the hyperinflammatory response common in diabetic wounds. Furthermore, the presence of copper ions facilitates tissue regeneration by encouraging angiogenesis and collagen deposition.

Notably, animal models involving diabetic foot ulcers and MRSA-induced keratitis validated the multi-pronged efficacy of these nanoassemblies. In addition, the treatment achieved superior bacterial eradication compared to standard interventions. These multifunctional nanoassemblies offer a promising precision therapeutic approach for patients suffering from pathogen-aggravated diabetic complications. Therefore, this technology could redefine how clinicians manage chronic, non-healing wounds in the future.

Frequently Asked Questions

How do DC/Cu nanoassemblies eliminate drug-resistant bacteria?

The nanoassemblies induce copper overload by increasing bacterial membrane permeability. This triggers a cuproptosis-like death by inhibiting essential Fe-S cluster proteins and disrupting energy metabolism.

What role does diclofenac sodium play in these nanoassemblies?

Diclofenac sodium is released in response to the infection microenvironment to mitigate local inflammation, which is a major barrier to healing in diabetic patients.

Can these nanoassemblies be used for eye infections?

Yes, research models have demonstrated their effectiveness in treating MRSA-induced keratitis, showcasing their potential for both wound care and ophthalmological applications.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or replace professional consultation. Refer to the latest local and national guidelines for clinical practice.

References

Feng T et al. Self-Cascading Copper-Based Nanoassemblies Trigger Bacterial Cuproptosis-Like Death and Promote Wound Healing for Diabetic Drug-Resistant Bacterial Infections. ACS Nano. 2026 Apr 29. doi: 10.1021/acsnano.5c21619. PMID: 42054707.

Zheng G et al. Immunomodulatory copper-based polyphenol nanozyme for diabetic infectious wound healing via NIR amplified cuproptosis bacteriostat. Bioact Mater. 2025. doi: 10.1016/j.bioactmat.2025.08.042.

Chen L et al. Defect-Rich MoO3-X@CuO2 Nanosheets Mediated Ultrasound-Enhanced Cuproptosis Antibacterial Activity and M2 Macrophage Reprogramming for Optimizing Diabetic Wound Repairment. Adv Healthc Mater. 2025. doi: 10.1002/adhm.202500601.