R. Suto et al., EFFECT OF ACCESSORY CELLS ON STIMULATION OF MURINE T-CELL LEUKEMIA WITH ANTIBODIES TO THE CD3 T-CELL ANTIGEN RECEPTOR COMPLEX, Japanese journal of cancer research, 84(4), 1993, pp. 438-444
Stimulation of EL4 and RL male 1 leukemia cells in vitro with immobili
zed anti-CD3epsilon monoclonal antibody (mAb) (145-2C11) or anti-TCRbe
ta mAb (H57-597) in the absence of accessory cells induced interleukin
-2 (IL-2) production, and caused growth inhibition. The growth inhibit
ion was, however, transient and the tumors started to grow again withi
n 5 days in immobilizing plates treated with antibodies at concentrati
ons of 2.5-100 mug/ml. Addition of mitomycin C-treated accessory cells
to the culture inhibited IL-2 production and resulted in augmented an
d persistent growth inhibition. No recovery of tumor growth was observ
ed. Furthermore, DNA from EL4 and RL male 1 leukemia cells stimulated
with anti-CD3/TCR mAbs was fragmented even in the absence of accessory
cells, but fragmentation was much greater in the presence of accessor
y cells. Marginal and high expression of the bcl-2 gene were observed
in EL4 and RL male 1, respectively, indicating that apoptosis of these
leukemias mediated by signalling through the CD3/TCR complex has no d
irect relationship with expression of the bcl-2 gene.