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Diabetes impairs the late inflammatory response to wound healing

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      Abstract

      Diabetes mellitus is recognized as a risk factor for compromised wound healing. This study examines leukocyte infiltration and the appearance of tumor necrosis factor-α (TNF) and IL-6 in wound chambers implanted in normal and streptozotocin-induced diabetic mice. Perforated silicone wound chambers containing a strip of polyvinyl alcohol sponge were implanted along the flanks of normal and diabetic mice. Wound fluid aspirated from the chambers 1, 3, and 7 days following implantation was analyzed for the total number of leukocytes and TNF and IL-6 levels. While the number of leukocytes in the wound fluid was similar on Days 1 and 3 following implantation, there were significantly fewer inflammatory cells in wound fluid from diabetic animals (13.8 × 106/ml) than in wound fluid from normal animals (28.5 × 106/ml) on Day 7 following implantation. TNF levels in the cell-free exudate fluid were similar between the two groups on all days examined. IL-6 levels were similar on Days 1 and 3 following implantation between the two groups, but there was significantly more IL-6 in wound fluid from normal animals (10,998 U/ml) than in wound fluid from diabetic animals (2096 U/ml) on Day 7 following implantation. Histologic evaluation of chambers 8 days following implantation revealed decreased neovascularization and less organization of granulation tissue. These data suggest that delayed healing in diabetes is associated with altered leukocyte infiltration and wound fluid IL-6 levels during the late inflammatory phase of wound healing.
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