Abstract
We have constructed a hybrid cDNA coding for a fusion protein between human interleukin 2 and a truncated heavy chain from human immunoglobulin M. The protein encoded by this cDNA contains the entire interleukin 2 sequence including its signal peptide, fused at its C terminus to domains 2 to 4 of the immunoglobulin heavy-chain constant region. Cells transfected with the hybrid cDNA secrete multimeric forms of the fusion protein, which bind specifically to cells bearing high-affinity interleukin 2 receptors. This binding leads either to T-cell proliferation or, if complement is added, to T-cell death. Multimeric forms of the fusion protein with a molecular mass above 500 kDa mediate complement-dependent lysis but trigger proliferation inefficiently when compared with forms with a low molecular mass (< 500 kDa). In contrast, the latter efficiently mediate T-cell proliferation without inducing complement-dependent lysis. The high molecular mass fusion proteins could thus constitute valuable tools for specific immunosuppression in humans.
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