Abstract
We examined the effects of lacking tumor necrosis factor α (TNFα) on the healing process of a cutaneous wound in mice using TNFα-deficient mice. A full-thickness circular cutaneous wound 5.0 mm in diameter was produced in the dorsal skin of wild-type (WT) or TNFα-null (KO) mice. After specific intervals of healing, the healing pattern was evaluated by macroscopic observation, histology, immunohistochemistry, or real-time reverse transcription-polymerase chain reaction. Effect of Smad7 gene transfer on the healing phenotype of KO mice was also examined. The results showed that loss of TNFα promotes granulation tissue formation and retards reepithelialization in a circular wound in mouse dorsal skin. Immunohistochemistry showed that distribution of macrophages and myofibroblasts in newly generated granulation tissue seemed similar between WT and KO mice. However, lacking TNFα enhanced mRNA expression of TGFβ1 and collagen Iα2 in such tissue. Smad7 gene transfer counteracted excess granulation tissue formation in KO mice. In conclusion, lacking TNFα potentiates Smad-mediated fibrogenic reaction in healing dermis and retards reepithelialization in a healing mouse cutaneous wound.
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Shinozaki, M., Okada, Y., Kitano, A. et al. Impaired cutaneous wound healing with excess granulation tissue formation in TNFα-null mice. Arch Dermatol Res 301, 531–537 (2009). https://doi.org/10.1007/s00403-009-0969-z
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DOI: https://doi.org/10.1007/s00403-009-0969-z