期刊
CELLULAR AND MOLECULAR LIFE SCIENCES
卷 78, 期 3, 页码 935-947出版社
SPRINGER BASEL AG
DOI: 10.1007/s00018-020-03545-4
关键词
Skin wound repair; Staphylococcus aureus; Connexin 43; Re-epithelialization
资金
- Division of Plastic and Reconstructive Surgery
Chronic wounds are often caused by bacterial contamination, with Staphylococcus aureus being a common strain. Inhibition of keratinocyte migration by S. aureus exudate may involve the upregulation of connexin-43 (Cx43). The treatment of bacterium-infected wounds may be improved by targeting Cx43 and Akt to overcome wound closure impairment.
Chronic wounds have been considered as major medical problems that may result in expensive healthcare. One of the common causes of chronic wounds is bacterial contamination that leads to persistent inflammation and unbalanced host cell immune responses. Among the bacterial strains that have been identified from chronic wounds, Staphylococcus aureus is the most common strain. We previously observed that S. aureus impaired mouse cutaneous wound healing by delaying re-epithelialization. Here, we investigated the mechanism of delayed re-epithelialization caused by S. aureus infection. With the presence of S. aureus exudate, the migration of in vitro cultured human keratinocytes was significantly inhibited and connexin-43 (Cx43) was upregulated. Inhibition of keratinocyte migration by S. aureus exudate disappeared in keratinocytes where the expression of Cx43 knocked down. Protein kinase phosphorylation array showed that phosphorylation of Akt-S473 was upregulated by S. aureus exudate. In vivo study of Cx43 in S. aureus-infected murine splinted cutaneous wound model showed upregulation of Cx43 in the migrating epithelial edge by S. aureus infection. Treatment with a PI3K/Akt inhibitor reduced Cx43 expression and overcame the wound closure impairment by S. aureus infection in the mouse model. This may contribute to the development of treatment to bacterium-infected wounds.
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