Abstract：
:Interleukin-2 (IL-2) has a key role in the antigen-specific clonal growth of T lymphocytes, by virtue of its interaction with a specific cell-surface receptor (IL-2R). The growth signal seems to be delivered by IL-2 bound to the high-affinity, but not the low-affinity, receptor. Genes encoding IL-2 and its receptor (that is, Tac-antigen) have been cloned and analysed in detail. We have now achieved cell-type-specific reconstitution of the high-affinity human IL-2R by expressing the complementary DNA cloned from normal lymphocytes. A mouse T-lymphocytic line, EL-4, expressed human IL-2R with high (dissociation constant (Kd) = 160-220 pM) and low (Kd = 2.1-2.2 nM) affinity for recombinant human IL-2, while mouse L929 cells expressed only a single class of the IL-2R with lower affinity (Kd = 34.5 nM) for the ligand. We also show that the human IL-2R expressed in EL-4 cells responds to IL-2 and mediates reversed signal transduction: growth of the EL-4 cells harbouring the IL-2R is inhibited specifically by human recombinant IL-2. The approach described here may provide a general experimental framework for elucidating the molecular basis of signal transduction mediated by specific receptor-ligand interaction.
journal_name
Naturejournal_title
Natureauthors
Hatakeyama M,Minamoto S,Uchiyama T,Hardy RR,Yamada G,Taniguchi Tdoi
10.1038/318467a0subject
Has Abstractpub_date
1985-12-05 00:00:00pages
467-70issue
6045eissn
0028-0836issn
1476-4687journal_volume
318pub_type
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