Changes of CD4~+CD25~+ and CD8~+CD28~- T regulatory cells in spontaneous tolerance of inbred rat orthotopic liver transplantation / 北京大学学报(医学版)

ABSTRACT

Objective: To explore the roles of CD4+CD25+and CD8+CD28- T regulatory cells in spontaneous tolerance of inbred rats orthotopic liver Transplantation.Methods: The orthotopic liver transplantation models of spontaneous tolerance were established between BN (donor) and LEW (recipient) inbred rats whose survival time was more than 120 days, The expression of CD8+CD28- T and CD4+CD25+T cells in PBMC and spleen were determined by flow cytometry. CD8+CD28- T and CD4+CD25+T cells were sorted by immunomagnetic beads. The expressions of CD25, CD28, CD152 and CD45RO on CD8+CD28- T and CD4+CD25+T regulatory cells were also determined by flow cytometry. Results: Compared with control groups, the proportion of CD8+CD28-T regulatory cells in spontaneous models was significantly increased in peripheral blood mononuclear cells (PBMC) and spleen [PBMC(30.2?5.8)% vs(16.4?6.1)%;Spleen(23.7?7.2)% vs(13.4?5.5)% P