Anergic cells induced by the blockade of CD40-CD154 and CD28-B7 costimulatory pathways act as potent immunoregulatory cells in vitro and vivo.
BACKGROUND
This study was to evaluate whether anergic cells induced by the blockade of CD40-CD154 and CD28-B7 costimulatory pathways can act as potent immunoregulatory cells in vitro and prolong cardiac allograft survival after adoptive transfer.


METHODS
Anergic cells were induced in vitro by the addition of anti-CD154 and anti-CD80 monoclonal antibodies (mAbs) to primary MLR (mixed lymphocyte reaction) consisting of BALB/c as responder and C3H as stimulator. Anergic cells were added to a newly formed MLR in assessing the regulatory capacity and antigen specificity of anergic cells. The ability of anergic cells to respond to antigen and/or exogenous recombinant mouse interleukin-2 (rmIL-2) was tested. For in vivo studies, anergic cells were intravenously injected into 3.0-Gy gamma-irradiated BALB/c mice immediately after heterotopic abdominal cardiac transplantation. To prolong allograft survival, recipient mice injected with anergic cells received rapamycin therapy [1 mg.day(-1).kg(-1)].


RESULTS
Anergic cells strongly suppressed the proliferation of naicaron;ve BALB/c splenocytes against the original (C3H) stimulator in a dose-dependent manner, but they failed to suppress the proliferation of naicaron;ve BALB/c splenocytes against the third-party (C57BL/6J) stimulator. The anergic state was reversed by both original (C3H) stimulator and additional exogenous IL-2. In in vivo studies, untreated irradiated BALB/c mice rejected C3H cardiac allografts with a mean survival time of (8.6 +/- 1.1) days, whereas those injected with the anergic cells rejected the allografts with a mean survival time of (11.8 +/- 1.9) days, which was slightly longer than that of the untreated mice. The protocol based on anergic cells injection plus rapamycin therapy could prolong allograft survival significantly [(29.6 +/- 4.4) days].


CONCLUSIONS
Anergic cells induced by the blockade of CD40-CD154 and CD28-B7 costimulatory pathways can act as potent immunoregulatory cells in vitro, and prolong cardiac allograft survival after adoptive transfer in the presence of rapamycin therapy. This procedure might be clinically useful for prolonging allograft survival if optimal protocols are developed.
Cai
Yong
Y
Organ Transplant Center & Department of Organ Transplant, Shanghai First Hospital, Shanghai 200080, China.
Zhou
Pei-jun
PJ
Tang
Xiao-da
XD
D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D018122:B7-1 Antigen / Q000502:physiology*; D018106:CD28 Antigens / Q000502:physiology*; D019013:CD40 Antigens / Q000502:physiology*; D023201:CD40 Ligand / Q000502:physiology*; D006085:Graft Survival; D016027:Heart Transplantation; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D014184:Transplantation, Homologous
D000911:Antibodies, Monoclonal; D018122:B7-1 Antigen; D018106:CD28 Antigens; D019013:CD40 Antigens; D023201:CD40 Ligand