title: B cell-dependent TCR diversification.
abstract: T cell diversity was once thought to depend on the interaction of T cell precursors with thymic epithelial cells. Recent evidence suggests, however, that diversity might arise through the interaction of developing T cells with other cells, the identity of which is not known. In this study we show that T cell diversity is driven by B cells and Ig. The TCR V beta diversity of thymocytes in mice that lack B cells and Ig is reduced to 6 x 10(2) from wild-type values of 1.1 x 10(8); in mice with oligoclonal B cells, the TCR V beta diversity of thymocytes is 0.01% that in wild-type mice. Adoptive transfer of diverse B cells or administration of polyclonal Ig increases thymocyte diversity in mice that lack B cells 8- and 7-fold, respectively, whereas adoptive transfer of monoclonal B cells or monoclonal Ig does not. These findings reveal a heretofore unrecognized and vital function of B cells and Ig for generation of T cell diversity and suggest a potential approach to immune reconstitution.
authors.affiliation: Transplantation Biology Program, Mayo Clinic, Rochester, MN 55905, USA.
authors.forename: Cristina
authors.initials: C
authors.lastname: João
authors.forename: Brenda M
authors.initials: BM
authors.lastname: Ogle
authors.forename: Carlota
authors.initials: C
authors.lastname: Gay-Rabinstein
authors.forename: Jeffrey L
authors.initials: JL
authors.lastname: Platt
authors.forename: Marilia
authors.initials: M
authors.lastname: Cascalho
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D017209:Apoptosis / Q000235:genetics / Q000276:immunology; D016175:B-Lymphocyte Subsets / Q000276:immunology* / Q000473:pathology / Q000637:transplantation; D002454:Cell Differentiation / Q000235:genetics / Q000276:immunology; D002455:Cell Division / Q000235:genetics / Q000276:immunology; D002465:Cell Movement / Q000235:genetics / Q000276:immunology; D015333:Gene Rearrangement, beta-Chain T-Cell Antigen Receptor; D006412:Hematopoietic Stem Cells / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D007074:Immunoglobulin G / Q000008:administration & dosage; D007143:Immunoglobulin Heavy Chains / Q000235:genetics; D007144:Immunoglobulin J-Chains / Q000235:genetics; D008231:Lymphopenia / Q000235:genetics / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000096:biosynthesis*; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D013950:Thymus Gland / Q000276:immunology / Q000378:metabolism / Q000473:pathology
chemical_list: D007074:Immunoglobulin G; D007143:Immunoglobulin Heavy Chains; D007144:Immunoglobulin J-Chains; D016693:Receptors, Antigen, T-Cell, alpha-beta