title: Requirement of cell interactions through adhesion molecules in the early phase of T cell development.
abstract: We investigated the role of adhesion molecules in T cell development. A large proportion of murine fetal thymus (FT) cells obtained at Day 13 of gestation, which are c-kit+, express the adhesion molecules Pgp-1, VLA-4, LFA-1, and ICAM-1 on their surface at high levels. The expression profiles of these adhesion molecules resemble quite well those on c-kit+ cells in fetal liver (FL). The level of expression of these molecules on FT cells declines with the embryonal age and becomes mostly negative by birth except for LFA-1. In the case of LFA-1, a reincrease of expression levels is seen in newborn mice. The role of these adhesion molecules in T cell development was investigated by adding monoclonal antibodies (mAb) into the FT organ cultures, where T cell development from FT or FL progenitors was induced by coculturing these cells with a deoxyguanosine-treated FT lobe. We found that anti-Pgp-1, anti-LFA-1, and anti-VLA-4 mAb severely inhibited the early phase of T cell development from FL progenitors. On the other hand, the suppressive effect of these mAb on the T cell development from FT progenitors was only slight, if any. These findings strongly suggest that interactions with elements in the thymic microenvironment through Pgp-1, LFA-1, and VLA-4 are indispensable for prethymic progenitors to develop into T cells.
authors.affiliation: Department of Immunology, Chest Disease Research Institute, Kyoto University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Wada
authors.forename: T
authors.initials: T
authors.lastname: Kina
authors.forename: H
authors.initials: H
authors.lastname: Kawamoto
authors.forename: M
authors.initials: M
authors.lastname: Kondo
authors.forename: Y
authors.initials: Y
authors.lastname: Katsura
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D015815:Cell Adhesion Molecules / Q000096:biosynthesis* / Q000276:immunology; D002450:Cell Communication / Q000276:immunology*; D002454:Cell Differentiation / Q000276:immunology*; D002460:Cell Line; D005260:Female; D005333:Fetus; D008099:Liver / Q000166:cytology / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D011247:Pregnancy; D013234:Stem Cells / Q000166:cytology; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D013950:Thymus Gland / Q000166:cytology
chemical_list: D000911:Antibodies, Monoclonal; D015815:Cell Adhesion Molecules