High-Glucose Environment Enhanced Oxidative Stress and Increased Interleukin-8 Secretion From Keratinocytes

New Insights Into Impaired Diabetic Wound Healing

  1. Gwo-Shing Chen1,2
  1. 1Department of Dermatology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
  2. 2Department of Dermatology, College of Medicine, Kaohsiung, Taiwan
  3. 3Department of Dermatology, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
  4. 4Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan
  5. 5Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan.
  1. Corresponding author: Gwo-Shing Chen, d700086{at}kmu.edu.tw.

Abstract

Impaired wound healing frequently occurs in patients with diabetes. Interleukin (IL)-8 production by keratinocyte is responsible for recruiting neutrophils during healing. Intense inflammation is associated with diabetic wounds, while reduction of neutrophil infiltration is associated with enhanced healing. We hypothesized that increased neutrophil recruitment by keratinocytes may contribute to the delayed healing of diabetic wounds. Using cultured human keratinocytes and a diabetic rat model, the current study shows that a high-glucose environment enhanced IL-8 production via epidermal growth factor receptor (EGFR)–extracellular signal–regulated kinase (ERK) pathway in a reactive oxygen species (ROS)-dependent manner in keratinocytes. In addition, diabetic rat skin showed enhanced EGFR, ERK, and IL-8 expression compared with control rats. The dermal neutrophil infiltration of the wound, as represented by expression of myeloperoxidase level, was also significantly higher in diabetic rats. Treating diabetic rats with dapsone, an agent known to inhibit neutrophil function, was associated with improved healing. In conclusion, IL-8 production and neutrophil infiltration are increased in a high-glucose environment due to elevated ROS level and contributed to impaired wound healing in diabetic skin. Targeting these dysfunctions may present novel therapeutic approaches.

  • Received December 11, 2012.
  • Accepted February 14, 2013.

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  1. Diabetes vol. 62 no. 7 2530-2538
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