Induction of cytolytic function in resting peripheral blood CD8+/Leu-7+ T cells through IL2/p 75 IL2-receptor interaction: a study in the allogeneic human bone marrow transplantation model.
CD8+/Leu-7+ T cells which circulate in increased proportions in the blood of long-term surviving BMT patients are for the most part high-density resting lymphocytes lacking IL2R-alpha (p55) expression. We show that they can be induced by IL2 to manifest cytolytic function after 24-48 hr stimulation by using rather high concentrations of IL2 (at least 50 U/ml). This function was much more readily induced in high-density CD8+/Leu-7+ T cells than in high-density CD8+/Leu-7+ T cells and occurred in the presence of minimal cell proliferation. Other cytokines involved in primary CTL differentiation (IFN-gamma, IL4 and IL6) were without effect suggesting that CD8+/Leu-7+ T cells are, in the BMT model, in vivo preactivated CTL ready to differentiate into cytolytic effectors under the sole IL2 stimulus. TU27 Mab directed at IL2R-beta (p75) subunit almost completely prevented IL2-induced cytolytic function of CD8+ T cells while 33B3.1 Mab directed at IL2R-alpha (p55) subunit was ineffective, suggesting that the signal for this function has its origin in IL2R-beta chains constitutively expressed by these cells.
Madariaga
L
L
Laboratoire d'Immunologie Cellulaire et de Transplantation, I.R.S.C., Villejuif, France.
Leroy
E
E
Moiré
N
N
Rouleau
M
M
Mishal
Z
Z
Rochant
H
H
Vernant
J P
JP
Charpentier
B
B
Ben Aribia
M
M
Senik
A
A
D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation / Q000032:analysis*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis*; D016026:Bone Marrow Transplantation / Q000276:immunology*; D018959:CD57 Antigens; D016827:CD8 Antigens; D002455:Cell Division; D003602:Cytotoxicity, Immunologic / Q000502:physiology*; D006801:Humans; D066298:In Vitro Techniques; D007376:Interleukin-2 / Q000502:physiology*; D007700:Kinetics; D015375:Receptors, Interleukin-2 / Q000502:physiology*; D013601:T-Lymphocytes / Q000276:immunology*; D014184:Transplantation, Homologous / Q000276:immunology
D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D018959:CD57 Antigens; D016827:CD8 Antigens; D007376:Interleukin-2; D015375:Receptors, Interleukin-2