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- W1583283620 abstract "Abstract Human interleukin 4 (IL-4) specifically induces the low affinity receptor for IgE (Fc epsilon R2/CD23) on the surface of the Burkitt lymphoma cell line Jijoye. At 4 degrees C 125I-IL-4 specifically binds to high affinity receptors (Kd = 4-10 x 10(-11) M; Bmax, 600-1,200 sites/cell). Following a rapid temperature shift from 4 to 37 degrees C, 80% of the receptor-bound 125I-IL-4 disappeared from the cell surface within 20 min (t1/2 = 8.9 min). For every two internalized molecules of IL-4 (t1/2 = 13 min), one molecule of IL-4 dissociated from the cell surface (t1/2 = 25 min). More than 90% of the internalized IL-4 was released in a degraded form into the medium following first order kinetics (t1/2 = 68 min). Internalization was inhibited by cytoskeletal disrupting and lysosomotropic agents. Incubating cells with 1 nM IL-4 resulted in a rapid down-regulation of IL-4 receptors (75% loss after 2 h); a reexpression of receptor to control level occurred after 20 h in spite of the presence of a large excess of IL-4. Reexpression was delayed by chloroquine and blocked by cycloheximide and actinomycin D. By using the cross-linking agent bis(sulfosuccinimidyl)suberate, three polypeptides of Mr 130,000, 80,000, and 70,000 were specifically labeled with 125I-IL-4. These three polypeptides coordinately disappeared and reappeared with the 125I-IL-4 binding sites. The induction of Fc epsilon R2/CD23 required prolonged incubation (greater than 8 h) with IL-4 and thus may be dependent on the reexpression of IL-4 receptor." @default.
- W1583283620 created "2016-06-24" @default.
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- W1583283620 date "1989-04-01" @default.
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- W1583283620 title "Internalization of Human Interleukin 4 and Transient Down-regulation of Its Receptor in the CD23-inducible Jijoye Cells" @default.
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- W1583283620 doi "https://doi.org/10.1016/s0021-9258(18)83528-1" @default.
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