Human beta-defensin-3 promotes wound healing in infected diabetic wounds

The Journal of Gene Medicine
Tobias HirschElof Eriksson

Abstract

Infected wounds present a major complication in patients with diabetes. Staphylococcus aureus is the most common single isolate in diabetic wounds. Human beta-defensin (hBD)-3 is antimicrobial active and appears to play a key role in the immune response. The present study aimed to analyse the effect of hBD-3 expression in a model of infected diabetic wounds. Excisional wounds were created on the backs of Yorkshire pigs and Ad5-CMV-hBD-3 vectors were microseeded. Wounds were inoculated with S. aureus, covered with a polyurethane chamber and analysed for transgene expression, bacterial infection, re-epithelialization, wound contraction, wound fluid production and blood vessel formation. hBD-3-treated wounds showed a total bacterial load of 2.1 x 10(8) colony-forming units (CFU)/g tissue, versus 1.3 x 10(9) CFU/g tissue for controls (p < 0.001) at day 4. At day 12, no statistical difference could be detected. Re-epithelialization showed 75 +/- 15% wound closure for hBD-3 expressing wounds and 50 +/- 16% for controls (p < 0.01). hBD-3 expression was in the range 15-20 ng/ml of wound fluid during day 1-4. The lower dose of 2 x 10(9) Ad5-CMV-hBD-3 showed no effect, suggesting a dose dependency for hBD-3. In the present study, we show...Continue Reading

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