title: SOCS1 negatively regulates the production of Foxp3+ CD4+ T cells in the thymus.
abstract: SOCS1 profoundly influences the development and peripheral homeostasis of CD8+ T cells but has less impact on CD4+ T cells. Despite the moderate influence of SOCS1 in the development of the total CD4 T-cell lineage, we show here that SOCS1 deficiency resulted in a 10-fold increase in Foxp3(+) CD4(+) T cells in the thymus. Increased numbers of Foxp3+ thymocytes occurred in mice with T-cell-specific ablation of SOCS1, suggesting that the effect is T-cell intrinsic. This increase in Foxp3+ CD4+cells in SOCS1-deficient mice also occurred in the absence of IFN-gamma or/and IL-7 signaling. Increase in CD25+CD4+ T cells in the absence of SOCS1 could be partly due to enhanced survival by CD25+CD4+cells, to a lesser degree CD25-CD4+ T cells, from SOCS1-deficient mice with or without T-cell growth factors.
authors.affiliation: The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia. zhan@wehi.edu.au
authors.forename: Yifan
authors.initials: Y
authors.lastname: Zhan
authors.forename: Gayle M
authors.initials: GM
authors.lastname: Davey
authors.forename: Kate L
authors.initials: KL
authors.lastname: Graham
authors.forename: Hiu
authors.initials: H
authors.lastname: Kiu
authors.forename: Nadine L
authors.initials: NL
authors.lastname: Dudek
authors.forename: Thomas  W H
authors.initials: T
authors.lastname: Kay
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Lew
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D051858:Forkhead Transcription Factors / Q000096:biosynthesis; D007371:Interferon-gamma / Q000235:genetics; D053645:Interleukin-2 Receptor alpha Subunit / Q000096:biosynthesis; D015851:Interleukin-7 / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D015398:Signal Transduction; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D050378:T-Lymphocytes, Regulatory / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D013950:Thymus Gland / Q000166:cytology / Q000254:growth & development / Q000276:immunology*
chemical_list: D051858:Forkhead Transcription Factors; C498833:Foxp3 protein, mouse; D053645:Interleukin-2 Receptor alpha Subunit; D015851:Interleukin-7; C491590:Socs1 protein, mouse; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins; D007371:Interferon-gamma