Time course study of delayed wound healing in a biofilm-challenged diabetic mouse model.

Wound Repair and Regeneration : Official Publication of the Wound Healing Society [and] the European Tissue Repair Society
Ge ZhaoJohn E Olerud

Abstract

Bacterial biofilm has been shown to play a role in delaying wound healing of chronic wounds, a major medical problem that results in significant health care burden. A reproducible animal model could be very valuable for studying the mechanism and management of chronic wounds. Our previous work showed that Pseudomonas aeruginosa (PAO1) biofilm challenge on wounds in diabetic (db/db) mice significantly delayed wound healing. In this wound time course study, we further characterize the bacterial burden, delayed wound healing, and certain aspects of the host inflammatory response in the PAO1 biofilm-challenged db/db mouse model. PAO1 biofilms were transferred onto 2-day-old wounds created on the dorsal surface of db/db mice. Control wounds without biofilm challenge healed by 4 weeks, consistent with previous studies; none of the biofilm-challenged wounds healed by 4 weeks. Of the biofilm-challenged wounds, 64% healed by 6 weeks, and all of the biofilm-challenged wounds healed by 8 weeks. During the wound-healing process, P. aeruginosa was gradually cleared from the wounds while the presence of Staphylococcus aureus (part of the normal mouse skin flora) increased. Scabs from all unhealed wounds contained 10(7) P. aeruginosa, which ...Continue Reading

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