The Effects of Occlusive Dressings on the Recruitment of Mononuclear Cells by Endothelial Binding into Acute Wounds

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Abstract
Mononuclear cell infiltration is a characteristic feature of wounds and may play an important role in the healing process. We have previously shown that the recruitment of peripheral blood mononuclear cells into wounded skin is an active, dynamic, and regulated process mediated at least in part by specific interactions between mononuclear leukocytes and specialized dermal microvascular endothelial cells in the wounded skin. The purpose of this study was to investigate the capacity of dermal microvascular endothelial cells in wounds exposed to air or covered with occlusive dressings to promote the adhesion of monocytes and lymphocytes. The results showed that dermal microvascular endothelial cells in both air-exposed and occluded wounds were capable of supporting peripheral blood mononuclear cell and monocyte adherence. However, in comparison with air exposed wounds, the level of peripheral blood mononuclear cell binding was significantly higher in occluded biopsies obtained at 0 to 9,12,15, and 21 days after wounding. In addition, monocyte and peripheral blood mononuclear cells binding to occluded wounds peaked earlier than peripheral blood mononuclear cell binding to air exposed wounds. These studies provide evidence that differences in the kinetics and magnitude of mononuclear cell adherence may account at least in part for the beneficial effects of occlusive dressing on wound healing.