| First Author | Chen L | Year | 2013 |
| Journal | J Invest Dermatol | Volume | 133 |
| Issue | 1 | Pages | 258-67 |
| PubMed ID | 22951730 | Mgi Jnum | J:196482 |
| Mgi Id | MGI:5488564 | Doi | 10.1038/jid.2012.267 |
| Citation | Chen L, et al. (2013) Toll-like receptor 4 has an essential role in early skin wound healing. Erratum 2014 page 583. J Invest Dermatol 133(1):258-67 |
| abstractText | Toll-like receptor 4 (TLR4) has a key role in the initiation of innate immunity and in the regulation of adaptive immune responses. Using microarray analysis and PCR, TLR4 expression was observed to increase in murine skin wounds at the early stages. The cellular location of TLR4 was primarily in keratinocytes at the wound edges. The closure of excisional wounds was significantly delayed in TLR4-deficient (C3H/HeJ) as compared with wild-type mice, and both IL-1beta and IL-6 production were significantly lower in the wounds of TLR4-deficient mice. EGF also markedly decreased in the wound edge of epidermis in TLR4-deficient mice. In vitro studies confirmed that a wound stimulus induces TLR4 mRNA expression in primary normal human epidermal keratinocytes (NHEK). In vitro injury also induced the phosphorylation of p38 and JNK MAPK (Jun N-terminal kinase mitogen-activated protein kinase) and the expression of IL-1beta and tumor necrosis factor-alpha by NHEK. Blockade of TLR4 delayed NHEK migration and abolished the phosphorylation of p38 and JNK MAPK, and blockade of TLR4 and/or p38/JNK abolished IL-1beta production. The results suggest that inflammatory cytokine production by injured NHEK is stimulated via the TLR4-p38 and JNK MAPK signaling pathway. Together, the results provide evidence for a role of TLR4 at sites of injury, and suggest that TLR4 is an important regulator of wound inflammation. |
