T-cell-replacing factor (interleukin 5) induces expression of interleukin 2 receptors on murine splenic B cells.
Small, resting B lymphocytes express few, if any, interleukin 2 (IL-2) receptors, but activated B cells may express such receptors. This paper examines the requirements for receptor expression. Normal murine splenocyte populations were enriched for B cells and cultured at relatively low density. IL-2 receptor expression was studied by measuring the binding of the anti-IL-2 receptor monoclonal antibody PC61. Lymphoblasts arising through stimulation by Escherichia coli lipopolysaccharide failed to express IL-2 receptors. B cells cultured with conditioned medium from concanavalin A-stimulated EL4 thymoma cells, with or without LPS, displayed IL-2 receptors. This bioactivity of EL4 conditioned medium could not be replaced by any concentration of B-cell-stimulatory factor 1 (IL-4), IL-1, IL-2, or IL-3 tested. However, the recently cloned lymphokine T-cell-replacing factor (IL-5) was a potent inducer of IL-2 receptor expression, as was the probably identical material known as eosinophil differentiation factor. The receptors so induced appeared to be functional, as receptor-expressing (but not control) lymphoblasts, responded to IL-2 by proliferation, indicative of high-affinity-receptor expression.
D000818:Animals; D001402:B-Lymphocytes / Q000187:drug effects / Q000378:metabolism*; D005434:Flow Cytometry; D005786:Gene Expression Regulation / Q000187:drug effects; D006133:Growth Substances / Q000494:pharmacology; D015847:Interleukin-4; D015848:Interleukin-5; D008222:Lymphokines / Q000494:pharmacology*; D051379:Mice; D008970:Molecular Weight; D011971:Receptors, Immunologic / Q000096:biosynthesis* / Q000235:genetics; D015375:Receptors, Interleukin-2; D013154:Spleen / Q000166:cytology
D006133:Growth Substances; D015848:Interleukin-5; D008222:Lymphokines; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2; D015847:Interleukin-4