title: The significantly enhanced frequency of functional CD4+CD25+Foxp3+ T regulatory cells in therapeutic dose aspirin-treated mice.
abstract: CD4(+)CD25(+)Foxp3(+) regulatory T (Treg) cells, produced in the thymus or periphery as a functionally mature T cell subpopulation, play pivotal roles in maintenance of self-tolerance and negative regulation of immune responses. Aspirin (ASA) is widely used to reduce pain, the risk of cardiovascular diseases and allo-graft rejection. However, the effect of ASA on CD4(+)CD25(+)Foxp3(+) Treg cells has yet to be determined. The frequency, phenotype and immunosuppressive function of CD4(+)CD25(+)Foxp3(+) Treg cells were detected in BALB/c mice treated with low or high doses of ASA for 4 weeks. ASA significantly decreased the percentage and number of CD4(+) T cells in the periphery, while ASA remarkably increased the percentage of CD4(+)CD25(+)Foxp3(+) Treg cells in CD4(+)T cells. The total cell numbers of thymocytes were significantly decreased in ASA-treated mice, but the number of CD4(+) CD25(+)Fxop3(+) cells and its ratio in CD4(+)CD8(-) thymocytes were markedly enhanced in the thymi of ASA-treated mice. The phenotype of CD4(+)CD25(+) Treg cells, including the expressions of CD44, CD45RB, CD62L, CD69, GITR and CTLA-4, did not show detectable changes in ASA-treated mice. CD4(+)CD25(+) Treg cells in ASA-treated mice exhibited unimpaired immunosuppressive function on CD4(+)CD25(-) T effector cells. ASA significantly enhanced the frequency of functional CD4(+)CD25(+)Foxp3(+) Treg cells in mice in a therapeutic dose range. The different effects of ASA on CD4(+)CD25(+)Foxp3(+) Treg cells and CD4(+)CD25(-) T cells may potentially make hosts susceptible to tolerance induction which would be beneficial for tolerance induction in patients with autoimmune diseases or allo-grafts. This study may have potential impacts in the clinical application of ASA.
authors.affiliation: Transplantation Biology Research Division, State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
authors.forename: Aqeel
authors.initials: A
authors.lastname: Javeed
authors.forename: Baojun
authors.initials: B
authors.lastname: Zhang
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Qu
authors.forename: Aijun
authors.initials: A
authors.lastname: Zhang
authors.forename: Chenming
authors.initials: C
authors.lastname: Sun
authors.forename: Lianjun
authors.initials: L
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: Chun
authors.initials: C
authors.lastname: Zeng
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000818:Animals; D001241:Aspirin / Q000008:administration & dosage*; D049109:Cell Proliferation / Q000187:drug effects*; D002469:Cell Separation; D004305:Dose-Response Relationship, Drug; D005260:Female; D005434:Flow Cytometry; D051858:Forkhead Transcription Factors; D016130:Immunophenotyping; D007165:Immunosuppression Therapy; D053645:Interleukin-2 Receptor alpha Subunit; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D050378:T-Lymphocytes, Regulatory / Q000187:drug effects* / Q000276:immunology* / Q000378:metabolism; D013950:Thymus Gland / Q000187:drug effects* / Q000276:immunology / Q000378:metabolism
chemical_list: C418974:FOXP3 protein, human; D051858:Forkhead Transcription Factors; D053645:Interleukin-2 Receptor alpha Subunit; D001241:Aspirin