CD4+CD25+Foxp3+ T cells and CD4+CD25-Foxp3+ T cells in aged mice.

نویسندگان

  • Tomohisa Nishioka
  • Jun Shimizu
  • Ryuji Iida
  • Sayuri Yamazaki
  • Shimon Sakaguchi
چکیده

Aging is associated with a progressive decline in T cell-mediated immune responses. However, it has been unknown whether regulatory/suppressive CD4 T cells are involved in this decline. Our in vitro analyses revealed that CD4+CD25+ T cells, the well-characterized naturally occurring regulatory/suppressive CD4 T cells, in aged mice are functionally comparable to those in young mice (i.e., anergic and suppressive), although slightly increased in number. In contrast, functional changes to whole CD4+CD25- T cells were pronounced in aged mice, i.e., the majority of aged CD4+CD25- T cells exhibited a significant hyporesponsiveness, and the remaining cells maintained a normal responsiveness. Furthermore, we identified Foxp3 (a transcription factor critical in conferring the regulatory/suppressive function to CD4 T cells)-positive suppressive CD4 T cells among aged hyporesponsive CD4+CD25- T cells. These results suggest that the age-related decline in T cell-mediated immune responses is ascribable to changes in the CD4+CD25- T cell population and not to a functional augmentation of suppressive CD4+CD25+ T cells.

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عنوان ژورنال:
  • Journal of immunology

دوره 176 11  شماره 

صفحات  -

تاریخ انتشار 2006