Biofilm–Host Immune Crosstalk at the Diabetic Foot Ulcer Interface: Molecular Mechanisms, Immune Evasion, and Next-Generation Anti-Biofilm Strategies

Changes in the body's metabolic state directly affect how microbial infections and biofilms form.

In diabetic foot ulcers, high levels of neutrophil extracellular traps are linked to higher levels of citrullinated histone H3, more severe wounds, and a greater chance of amputation, suggesting these traps are involved in persistent inflammation and poor healing.

In diabetic foot ulcers, the NLRP3 inflammasome remains active and triggers excessive neutrophil extracellular trap formation, which increases interleukin-1β levels and sustains inflammation, preventing tissue repair.

Staphylococcus aureus living in biofilms within diabetic foot ulcers reduces immune detection by inhibiting perforin-2, hiding molecular signatures, and releasing molecules that trigger inflammation through NLRP3 and AIM2 pathways.

In diabetic foot ulcers, reduced perforin-2 in skin cells allows Staphylococcus aureus to survive inside the cells, triggering a chain of molecular events that cause cell death and prolonged inflammation, preventing the wound from healing.

In diabetic wounds, high blood sugar, poor blood flow, and nerve damage create conditions that allow Staphylococcus aureus biofilms to persist by reducing the body's ability to fight infection and increasing bacterial harmfulness.