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TNFalpha suppression of corneal epithelium migration
Yuka Okada1, Kazuo Ikeda, Osamu Yamanaka
1Department of Ophthalmology, Wakayama Medical University, Wakayama, Japan.
Purpose:
To evaluate the role of tumor necrosis factor alpha (TNFalpha) in regulation of corneal epithelial cell migration.
Methods:
Cell culture of immortalized corneal epithelial cell line was employed to examine the role of transforming growth factor beta1 (TGFbeta1) and TNFalpha on cell migration and cell signaling. Healing of central epithelial defect was also observed in organ culture in the presence or absence of neutralizing antibody against either TNFalpha or TGFbeta1.
Results:
In cell cultures of corneal epithelial cell line, adding TNFalpha suppresses activation of p38 signal and cell migration, but not Smad2 activation, upon TGFbeta1 exposure. In an organ culture system, healing of an epithelial defect was promoted by the loss of TNFalpha. A neutralizing antibody against TNFalpha also promoted closure of an epithelial defect of organ cultured WT mouse corneas. Anti-TGFbeta neutralizing antibody reversed facilitation of epithelial healing in KO corneas in organ culture.
Conclusions:
TNFalpha inhibits migration of corneal epithelial cells.
