Abstract
High-affinity IL-2-R correspond to a membrane receptor complex composed of two different IL-2-binding proteins, the Tac antigen (alpha chain) and a 70-75 kD beta chain. Using cell lines that express either the alpha or the beta protein, we demonstrate that IL-2 internalization occurs when ligand is bound to the isolated beta chain, but not when it is bound to the isolated alpha chain. The kinetics of IL-2 internalization mediated by the intermediate-affinity beta chain were nearly identical to those of the high-affinity alpha/beta heterodimer (t1/2 of 10-15 min), and each type of receptor targeted the bound IL-2 for intracellular degradation in lysosomes. The beta chain thus appeared to provide the essential element necessary for ligand internalization by both types of IL-2-R.
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- Fujii M., Sugamura K., Sano K., Nakai M., Sugita K., Hinuma Y. High-affinity receptor-mediated internalization and degradation of interleukin 2 in human T cells. J Exp Med. 1986 Mar 1;163(3):550–562. doi: 10.1084/jem.163.3.550. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Leonard W. J., Depper J. M., Crabtree G. R., Rudikoff S., Pumphrey J., Robb R. J., Krönke M., Svetlik P. B., Peffer N. J., Waldmann T. A. Molecular cloning and expression of cDNAs for the human interleukin-2 receptor. Nature. 1984 Oct 18;311(5987):626–631. doi: 10.1038/311626a0. [DOI] [PubMed] [Google Scholar]
- Ortaldo J. R., Mason A. T., Gerard J. P., Henderson L. E., Farrar W., Hopkins R. F., 3rd, Herberman R. B., Rabin H. Effects of natural and recombinant IL 2 on regulation of IFN gamma production and natural killer activity: lack of involvement of the Tac antigen for these immunoregulatory effects. J Immunol. 1984 Aug;133(2):779–783. [PubMed] [Google Scholar]
- Ralph P., Jeong G., Welte K., Mertelsmann R., Rabin H., Henderson L. E., Souza L. M., Boone T. C., Robb R. J. Stimulation of immunoglobulin secretion in human B lymphocytes as a direct effect of high concentrations of IL 2. J Immunol. 1984 Nov;133(5):2442–2445. [PubMed] [Google Scholar]
- Robb R. J. Conversion of low-affinity interleukin 2 receptors to a high-affinity state following fusion of cell membranes. Proc Natl Acad Sci U S A. 1986 Jun;83(11):3992–3996. doi: 10.1073/pnas.83.11.3992. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Robb R. J., Greene W. C., Rusk C. M. Low and high affinity cellular receptors for interleukin 2. Implications for the level of Tac antigen. J Exp Med. 1984 Oct 1;160(4):1126–1146. doi: 10.1084/jem.160.4.1126. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Robb R. J., Mayer P. C., Garlick R. Retention of biological activity following radioiodination of human interleukin 2: comparison with biosynthetically labeled growth factor in receptor binding assays. J Immunol Methods. 1985 Jul 16;81(1):15–30. doi: 10.1016/0022-1759(85)90118-8. [DOI] [PubMed] [Google Scholar]
- Robb R. J., Munck A., Smith K. A. T cell growth factor receptors. Quantitation, specificity, and biological relevance. J Exp Med. 1981 Nov 1;154(5):1455–1474. doi: 10.1084/jem.154.5.1455. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sharon M., Klausner R. D., Cullen B. R., Chizzonite R., Leonard W. J. Novel interleukin-2 receptor subunit detected by cross-linking under high-affinity conditions. Science. 1986 Nov 14;234(4778):859–863. doi: 10.1126/science.3095922. [DOI] [PubMed] [Google Scholar]
- Tsudo M., Kozak R. W., Goldman C. K., Waldmann T. A. Demonstration of a non-Tac peptide that binds interleukin 2: a potential participant in a multichain interleukin 2 receptor complex. Proc Natl Acad Sci U S A. 1986 Dec;83(24):9694–9698. doi: 10.1073/pnas.83.24.9694. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Weissman A. M., Harford J. B., Svetlik P. B., Leonard W. L., Depper J. M., Waldmann T. A., Greene W. C., Klausner R. D. Only high-affinity receptors for interleukin 2 mediate internalization of ligand. Proc Natl Acad Sci U S A. 1986 Mar;83(5):1463–1466. doi: 10.1073/pnas.83.5.1463. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Yodoi J., Teshigawara K., Nikaido T., Fukui K., Noma T., Honjo T., Takigawa M., Sasaki M., Minato N., Tsudo M. TCGF (IL 2)-receptor inducing factor(s). I. Regulation of IL 2 receptor on a natural killer-like cell line (YT cells). J Immunol. 1985 Mar;134(3):1623–1630. [PubMed] [Google Scholar]