title: Heterogeneous reactivity of murine epidermal Langerhans cells after application of FITC: a histochemical evaluation.
abstract: To elucidate the detailed kinetics of epidermal Langerhans cells after topical contact sensitizer stimulation, we examined ATPase or Ia positive epidermal cells of BALB/c mice in a time-spaced manner after the topical application of fluorescein isothiocyanate (FITC). We also performed double labeling of Langerhans cells in epidermal sheets with ATPase activity and Ia antigen or costimulatory molecules (B7-1 and B7-2) after the same stimulation. Observations showed that the density of ATPase positive cells and Ia positive cells decreased following a different time course; the former reached a nadir (77.4% of control) at 4 h but the latter reached a minimum (82.8% of control) at 16 h after the application of FITC. A double labeling technique revealed an increase in Ia single positive cells at 4 h as opposed to that of ATPase single positive cells at 16 h after application. Both costimulatory molecules were expressed on the dendritic processes of many Langerhans cells as a dotty pattern at 4 h after application; B7 positive and ATPase negative areas were observed at this time. On electron microscopic observation, a few activated Langerhans cells found in the dermis at 4 h after application had distinctive profiles compared with residual Langerhans cells in the epidermis. These findings suggest that there is a heterogeneity of reactivity to FITC in epidermal Langerhans cells, and that only a small portion of them migrates from the epidermis during sensitization. The findings also indicate the importance of the interaction between the Langerhans cell and its surrounding microenvironment in the epidermis for its activation. In addition, the results indicate that the enzymatic and the phenotypic markers do not definitively reflect the presence (or absence) of Langerhans cells.
authors.affiliation: Department of Pediatrics, Nagoya University School of Medicine, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Doi
authors.forename: M
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Sugiura
authors.forename: T
authors.initials: T
authors.lastname: Sakamoto
authors.forename: S
authors.initials: S
authors.lastname: Torii
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D015703:Antigens, CD / Q000378:metabolism; D018122:B7-1 Antigen / Q000378:metabolism; D051940:B7-2 Antigen; D002452:Cell Count / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D003712:Dendrites / Q000187:drug effects; D020405:Dermis / Q000166:cytology / Q000187:drug effects / Q000648:ultrastructure; D000078404:Epidermal Cells; D004817:Epidermis / Q000187:drug effects* / Q000378:metabolism / Q000648:ultrastructure; D005260:Female; D016650:Fluorescein-5-isothiocyanate / Q000494:pharmacology*; D006241:Haptens / Q000494:pharmacology*; D000949:Histocompatibility Antigens Class II / Q000378:metabolism; D007150:Immunohistochemistry; D007801:Langerhans Cells / Q000166:cytology* / Q000187:drug effects* / Q000378:metabolism / Q000648:ultrastructure; D008562:Membrane Glycoproteins / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008854:Microscopy, Electron; D051381:Rats; D013997:Time Factors
chemical_list: D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; C497965:Cd86 protein, mouse; C497966:Cd86 protein, rat; D006241:Haptens; D000949:Histocompatibility Antigens Class II; D008562:Membrane Glycoproteins; D000251:Adenosine Triphosphatases; D016650:Fluorescein-5-isothiocyanate