Hydrogel Accelerates Infected Wound Repair – Antibacterial Properties
Novel Hydrogel Shows Promise in Treating Infected Wounds & Combating Antibiotic resistance
A newly developed injectable hydrogel, dubbed PSG15, demonstrates significant potential in accelerating wound healing while concurrently addressing the growing threat of antibiotic resistance. Researchers at the Beijing Institute of Radiation Medicine have engineered this multifunctional material to not only combat bacterial infections but also to regulate the skin’s natural microbial community, fostering a healthier healing surroundings.
Addressing the Challenge of infected Wounds
Infected wounds represent a ample clinical challenge, often leading to chronic non-healing conditions and requiring prolonged antibiotic treatment. Though, the overuse of antibiotics has fueled the rise of antibiotic-resistant bacteria, complicating treatment and increasing healthcare costs. Effective wound care strategies that minimize reliance on systemic antibiotics are urgently needed. PSG15 offers a promising alternative by integrating antimicrobial action with support for the skin’s natural defenses.
How PSG15 Works: A Multifaceted Approach
PSG15 is a hydrogel composed of sodium alginate and gelatin, enhanced with ε-poly-L-lysine (ε-PLL) and crosslinked with calcium chloride. This unique composition delivers a powerful combination of benefits:
Broad-Spectrum Antibacterial Activity: The hydrogel effectively reduces bacterial load, demonstrating a 89.53% reduction in E. coli and a 92.21% reduction in S. aureus in laboratory tests. This potent antibacterial effect is crucial for controlling infection at the wound site.
Enhanced Tissue Regeneration: In vivo studies showed PSG15 promotes angiogenesis (new blood vessel formation) and collagen deposition – essential processes for wound closure and tissue repair. Histological analysis confirmed improved tissue regeneration with increased vascularization and organized collagen fibers compared to untreated wounds.
Modulated Immune Response: PSG15 influences macrophage polarization, shifting the balance from pro-inflammatory M1 macrophages to tissue-repairing M2 macrophages. This is evidenced by increased expression of the M2 marker CD206 and decreased expression of the M1 marker CD80. By modulating the inflammatory response, the hydrogel creates a more conducive environment for healing. Skin Microbiota Preservation: Unlike some antimicrobial treatments that disrupt the skin’s delicate microbial balance, PSG15 maintains the diversity of the skin microbiota, preventing the overgrowth of harmful pathogens. This is a critical feature, as a healthy microbiome is vital for long-term wound health and preventing reinfection.
Exceptional Physical Properties: PSG15 exhibits excellent injectability and self-adhesiveness,allowing for easy application to irregularly shaped wounds. It also possesses significant mechanical strength, providing structural support to the healing tissue.
Study Details & Findings
The development and testing of PSG15 were detailed in a recent publication in Burns & Trauma (To, X., et al. (2025). A multifunctional injectable ε-poly-L-lysine-loaded sodium-alginate/gelatin hydrogel promotes the healing of infected wounds by regulating macrophage polarization and the skin microbiota. Burns & Trauma. doi.org/10.1093/burnst/tkaf037). The research team rigorously evaluated the hydrogel’s properties in vitro and in vivo, demonstrating it’s biocompatibility and non-toxicity.
The in vivo* studies specifically highlighted the hydrogel’s ability to accelerate wound closure and improve the quality of regenerated tissue. The observed improvements in angiogenesis and collagen deposition were statistically significant, indicating a clear therapeutic benefit.
Implications for clinical Practice & Future Research
“The PSG15 hydrogel represents a significant advancement in wound care by integrating both antimicrobial properties and microbiota regulation,” explains Dr. Chaoji Huangfu, the study’s corresponding author from the Beijing Institute of Radiation Medicine. “This dual approach not only accelerates healing but also minimizes the risk of chronic infections, which are a major challenge in wound management. We are optimistic that PSG15 will provide a safer, more effective treatment option for infected wounds in clinical settings.”
The potential to reduce reliance on systemic antibiotics is particularly noteworthy, given the escalating global crisis of antibiotic resistance. By providing targeted antimicrobial action and supporting the skin’s natural defenses,PSG15 could play a crucial role in preserving the effectiveness of existing antibiotics.
Future research will focus on evaluating PSG15’s efficacy in treating chronic wound models, such as diabetic ulcers, and further elucidating the mechanisms underlying its interaction with the