Identification and initial characterization of a rat monoclonal antibody reactive with the murine interleukin 2 receptor-ligand complex.

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Abstract
Xenogeneic monoclonal antibodies were prepared to the murine interleukin 2 (IL-2)-dependent HT2 cell line. One rat IgM monoclonal antibody (7D4) was identified that inhibited proliferation of the HT2 cells and of IL-2-dependent [mouse] CTLL [chronic T-lymphocytic leukemia] cells in the presence of crude rat IL-2 as well as of purified human IL-2. The level of inhibition was dependent on both antibody and IL-2 concentration. Cell distribution studies using a fluorescence-activated cell sorter showed that the antigen identified by 7D4 is expressed at a high density on HT2 cells and on concanavalain A (Con A)-induced T-cell blasts and at a substantially lower density on lipopolysaccharide-induced B-cell blasts; 7D4 binding was not detected on > 95% of nonactivated thymocytes, T cells or B cells. Competition binding studies indicated that 7D4 fails to inhibit the binding of 3H-labeled human IL-2 to CTLL cells. 7D4 specifically immunoprecipitated 3H-labeled human IL-2 from detergent extracts of HT2 cells or Con A-induced T-cell blasts that were pulsed with [3H]IL-2; 7D4 did not react with free [3H]IL-2. Initial biochemical analysis of immunoprecipitates with 7D4 of detergent extracts from surface-iodinated Con A-activated spleen cells showed a major band having apparent MW of 48,000-62,000 [daltons]. Evidently, 7D4 detects an epitope on the IL-2 receptor distal to the ligand binding site or another molecule that physically associates with the receptor.