Injury is a major inducer of epidermal innate immune responses during wound healing
Authors
Roupé KM, Nybo M, Sjöbring U, Alberius P, Schmidtchen A, Sørensen OE.
Institution
Division of Infection Medicine, Lund University, Lund
Country
Sweden
Year
2010
Journal
Journal of Investigative Dermatology
Abstract
We examined the importance of injury for the epidermal innate immune response in human skin wounds. We found that injury, independent of infiltrating inflammatory cells, generated prominent chemotactic activity toward neutrophils in injured skin because of IL-8 production. Furthermore, injury was a major inducer of the expression of antimicrobial (poly)peptides (AMPs) in skin wounds. In human skin, these injury-induced innate immune responses were mediated by activation of the epidermal growth factor receptor (EGFR). Consequently, inhibition of the EGFR blocked both the chemotactic activity generated in injured skin and the expression of the majority of the AMPs. The importance of injury was confirmed in mouse experiments in vivo, in which injury independent of infection was a potent inducer of AMPs in skin wounds. To our knowledge, these data thereby provide a previously unreported molecular link between injury and neutrophil accumulation and identify the molecular background for the vast expression of IL-8 and AMPs in wounded epidermis. Conceptually, these data show that the growth factor response elicited by injury is important for the recruitment of neutrophils in skin wounds.
Product use
Cultivation for murine cytokines for consequent mRNA extractioin and western blott analysis