title: Sox-4 facilitates thymocyte differentiation.
abstract: The mouse Sry-like transcription factor Sox-4 is expressed in thymus, bone marrow, and gonads of adult mice. Sox-4-deficient mice die at embryonic day E14 due to cardiac malformation. In transfer experiments to irradiated recipients, B cell development was shown to be severely impaired in Sox-4-deficient progenitor cells. However, no drastic effects on T lymphocyte development were noted, despite the high level expression of the Sox-4 gene in the thymus of normal mice. Here, we report a detailed analysis of T cell development from Sox-4-deficient progenitors. Explanted fetal thymic organ cultures (FTOC) of Sox-4-deficient thymi yielded 10-50-fold fewer CD4 CD8 double-positive and single-positive cells than FTOC of littermates. This effect was T cell-autonomous, since similar observations were made when FTOC were performed by culturing of Sox-4-deficient progenitors in wild-type thymus lobes. When Sox-4-deficient fetal liver cells were injected together with normal cells intrathymically, they did not compete efficiently for reconstitution. It is concluded that Sox-4 facilitates thymocyte development.
authors.affiliation: Department of Immunology, University Hospital, Utrecht, The Netherlands. msch@kindjc.medfac.leidenuniv.nl
authors.forename: M W
authors.initials: MW
authors.lastname: Schilham
authors.forename: P
authors.initials: P
authors.lastname: Moerer
authors.forename: A
authors.initials: A
authors.lastname: Cumano
authors.forename: H C
authors.initials: HC
authors.lastname: Clevers
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects / Q000235:genetics / Q000276:immunology; D005260:Female; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000378:metabolism; D006609:High Mobility Group Proteins / Q000235:genetics / Q000502:physiology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008817:Mice, Mutant Strains; D009924:Organ Culture Techniques; D011828:Radiation Chimera; D055751:SOXC Transcription Factors; D013601:T-Lymphocytes / Q000166:cytology / Q000378:metabolism*; D013950:Thymus Gland / Q000166:cytology* / Q000254:growth & development / Q000378:metabolism; D015534:Trans-Activators / Q000235:genetics / Q000502:physiology*
chemical_list: D006609:High Mobility Group Proteins; D055751:SOXC Transcription Factors; C489990:Sox4 protein, mouse; D015534:Trans-Activators