Abstract

Object: Wound healing is known to require a well-organized balance of numerous factors, e.g. cytokines, matrix metalloproteinases (MMPs) and their inhibitors, as well as direct cell-cell communication (connexins, Cx). Disruption of this balance may lead to the formation of chronic wounds such as diabetic foot ulcers. The transplantation of autologous keratinocytes is a promising therapy for diabetic foot ulcers, however little is known about their characteristics on molecular level. Therefore, we intended to characterize transplanted keratinocytes from diabetic and non-diabetic origin before and after transplantation.

Research Design and Methods: We isolated human keratinocytes from diabetic and non-diabetic origin and transplanted them into an ex-vivo wound healing model. To characterize the keratinocytes we investigated mRNA expression of MMP1, 2, and 9 TIMP1 and 2, IL-1β, TNFα, Cx26 and Cx43 and, for Cx, immunolocalization.

Results: We found no significantly increased expression of the molecules investigated in cultured keratinocytes from diabetic compared to non-diabetic origin, even though there were significant differences for MMP-2, IL1-β and TNFα in skin biopsies. Expression of IL-1β was significantly lower in keratinocytes from diabetic origin. In the course of wound healing, differences in the dynamics of expression of MMP-1, IL-1β and Cx43 were observed.

Conclusion: Our results suggest that keratinocytes from diabetic origin are as capable for transplantation into chronic wounds as keratinocytes from healthy origin at the starting point of therapy. However, differences in expression dynamics later on might reflect the systemic influence of diabetes resulting in a memory of the transplanted keratinocytes.