title: The fate of thymocytes labeled in vivo with CFSE.
abstract: The fate of thymic emigrants had so far been studied using a variety of markers, each of which had inherent limitations as to stability, toxicity, or selectivity. We describe a new technique which relies on the in vivo injection of CFSE, an esterified vital dye hitherto used at 80 times lower concentrations for in vitro cell labeling. We show that CFSE labels a representative sample of all thymocyte subsets and that these migrate at a rate of approximately 2-3 x 10(6) cells/day to peripheral lymphoid organs. We show that they enter lymph nodes at day 1 postinjection and stay for at least 21 days, whereas the turnover in the spleen is more rapid. We also show by immunohistochemistry, using peroxidase-labeled anti-FITC antibodies, that CFSE-labeled thymic emigrants are confined to T-dependent areas of peripheral lymphoid organs.
authors.affiliation: Centre de Recherche en Immunologie, Institut Armand-Frappier, Laval, Quebec, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Graziano
authors.forename: Y
authors.initials: Y
authors.lastname: St-Pierre
authors.forename: C
authors.initials: C
authors.lastname: Beauchemin
authors.forename: M
authors.initials: M
authors.lastname: Desrosiers
authors.forename: E F
authors.initials: EF
authors.lastname: Potworowski
mesh_terms: D000818:Animals; D015415:Biomarkers; D017252:CD3 Complex / Q000032:analysis; D015496:CD4-Positive T-Lymphocytes / Q000737:chemistry / Q000166:cytology; D018414:CD8-Positive T-Lymphocytes / Q000737:chemistry / Q000166:cytology; D002455:Cell Division / Q000502:physiology; D005452:Fluoresceins; D005455:Fluorescent Antibody Technique; D005456:Fluorescent Dyes; D007700:Kinetics; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D008845:Microinjections; D012680:Sensitivity and Specificity; D012867:Skin / Q000166:cytology / Q000276:immunology; D013154:Spleen / Q000166:cytology / Q000276:immunology; D013388:Succinimides; D013950:Thymus Gland / Q000737:chemistry / Q000166:cytology*
chemical_list: C087165:5-(6)-carboxyfluorescein diacetate succinimidyl ester; D015415:Biomarkers; D017252:CD3 Complex; D005452:Fluoresceins; D005456:Fluorescent Dyes; D013388:Succinimides