Abstract
The growth of mature T lymphocytes is regulated by interaction between interleukin-2 (IL-2) and its receptor1. Three distinct binding sites for IL-2, namely low- (Kd 10 nM), intermediate- (Kd 100 pM) and high- (Kd 10 pM) affinity sites, have been found on human and primate T lymphocytes2–4. Chemical crosslinking of labelled IL-2 to human T cells shows that two polypeptide chains, p55 (L chain) and p75 (H chain), bind IL-2 with low and intermediate affinities respectively. The high-affinity binding was shown to arise from ternary complex formation of IL-2, L and H chains5. Construction of mutants of the L-chain complementary DNA indicated that the L chain is not directly involved in growth signal transduction6. Nevertheless, expression of the IL-2 receptor L chain is tightly regulated by antigen or mitogen stimulation. To investigate the L chain function, we have produced transgenic mice using human L-chain cDNA of the IL-2 receptor under the control of a constitutive promoter. Studies on the L-chain transgenic mice showed that functionally active IL-2 receptors with high affinity were expressed on unstimulated spleen and thymus cells. The results indicate that the H chain of the IL-2 receptor is constitu-tively expressed in T cells.
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Nishi, M., Ishida, Y. & Honjo, T. Expression of functional interleukin-2 receptors in human light chain/Tac ransgenic mice. Nature 331, 267–269 (1988). https://doi.org/10.1038/331267a0
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DOI: https://doi.org/10.1038/331267a0
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