Characterization of CD28(-)CD4(+) T cells in living kidney transplant patients with long-term allograft acceptance

Hum Immunol. 2001 Dec;62(12):1335-45. doi: 10.1016/s0198-8859(01)00353-6.

Abstract

CD28(-)CD4(+) T-cell subpopulation is expanded in kidney allograft patients with long graft survival. To seek for the roles of CD28(-)CD4(+) T cells in the long-term acceptance of kidney allografts, we characterized this population by analyzing cell surface molecules, TCR V(beta) repertoire, mixed lymphocyte reaction (MLR), and cytokine production. The number of CD28(-)CD4(+) T cells increased correlatively with time after transplantation in this group of patients. The CD28(-)CD4(+) T cells did not express detectable levels of CD25, CD69, V(alpha)24, or CTLA-4 but expressed heterogeneous amounts of CD45 RA on the surface. Freshly sorted CD28(-)CD4(+) T cells revealed a restricted V(beta) repertoire, whereas the V(beta) usage of CD28(+)CD4(+) T cells from the same patients was much diversified. Expression levels of TGF-beta and IFNgamma gene were significantly higher in the CD28(-) CD4(+) T cells than in the CD28(+)CD4(+) T cells from the kidney allograft patients. These findings suggest that an oligoclonal CD28(-) CD4(+) T-cell population is continuously activated in patients with long allograft survival, which may be linked with the long-term acceptance.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • CD28 Antigens / metabolism*
  • CD28 Antigens / physiology*
  • CD4-Positive T-Lymphocytes / metabolism*
  • CD4-Positive T-Lymphocytes / physiology*
  • Cytokines / metabolism
  • Female
  • Graft Survival*
  • Humans
  • Kidney Transplantation / immunology*
  • Lymphocyte Culture Test, Mixed
  • Male
  • Middle Aged
  • Receptors, Antigen, T-Cell, alpha-beta / analysis
  • Transplantation, Homologous

Substances

  • CD28 Antigens
  • Cytokines
  • Receptors, Antigen, T-Cell, alpha-beta