title: ICAM-1 is necessary for epithelial recruitment of gammadelta T cells and efficient corneal wound healing.
abstract: Wound healing and inflammation are both significantly reduced in mice that lack gammadelta T cells. Here, the role of epithelial intercellular adhesion molecule-1 (ICAM-1) in gammadelta T cell migration in corneal wound healing was assessed. Wild-type mice had an approximate fivefold increase in epithelial gammadelta T cells at 24 hours after epithelial abrasion. ICAM-1(-/-) mice had 50.9% (P < 0.01) fewer gammadelta T cells resident in unwounded corneal epithelium, which failed to increase in response to epithelial abrasion. Anti-ICAM-1 blocking antibody in wild-type mice reduced epithelial gammadelta T cells to a number comparable to that of ICAM-1(-/-) mice, and mice deficient in lymphocyte function-associated antigen-1 (CD11a/CD18), a principal leukocyte receptor for ICAM-1, exhibited a 48% reduction (P < 0.01) in peak epithelial gammadelta T cells. Re-epithelialization and epithelial cell division were both significantly reduced ( approximately 50% at 18 hours, P < 0.01) after abrasion in ICAM-1(-/-) mice versus wild-type, and at 96 hours, recovery of epithelial thickness was only 66% (P < 0.01) of wild-type. ICAM-1 expression by corneal epithelium in response to epithelial abrasion appears to be critical for accumulation of gammadelta T cells in the epithelium, and deficiency of ICAM-1 significantly delays wound healing. Since gammadelta T cells are necessary for efficient epithelial wound healing, ICAM-1 may contribute to wound healing by facilitating gammadelta T cell migration into the corneal epithelium.
authors.affiliation: Section of Leukocyte Biology, Children's Nutrition Research Center, Room 6014, 1100 Bates, Houston, Texas 77030, USA.
authors.forename: Sarah E
authors.initials: SE
authors.lastname: Byeseda
authors.forename: Alan R
authors.initials: AR
authors.lastname: Burns
authors.forename: Sean
authors.initials: S
authors.lastname: Dieffenbaugher
authors.forename: Rolando E
authors.initials: RE
authors.lastname: Rumbaut
authors.forename: C Wayne
authors.initials: CW
authors.lastname: Smith
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Li
mesh_terms: D000818:Animals; D002465:Cell Movement / Q000235:genetics / Q000276:immunology; D019573:Epithelium, Corneal / Q000166:cytology / Q000276:immunology* / Q000293:injuries; D018799:Intercellular Adhesion Molecule-1 / Q000235:genetics / Q000502:physiology*; D051379:Mice; D008817:Mice, Mutant Strains; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000235:genetics / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D014945:Wound Healing / Q000235:genetics / Q000276:immunology*
chemical_list: C090509:Icam1 protein, mouse; D016692:Receptors, Antigen, T-Cell, gamma-delta; D018799:Intercellular Adhesion Molecule-1