title: Production of high levels of interleukin 1-like activity by the SPI-802 human leukemia cell line with E receptors.
abstract: The SPI-802 human leukemia cell line, which possesses E receptors and used to have natural killer activity, has been demonstrated to produce high levels of interleukin 1 (IL-1)-like activity. SPI-802 supernatants prepared in 1% serum-containing cultures with lipopolysaccharide stimulation, like similarly prepared adherent-cell-derived IL-1, enhanced phytohemagglutinin-induced mouse thymocyte proliferation. When adherent-cell IL-1 gave 50% maximum activity at a reciprocal dilution of 20, SPI-802 supernatant gave it at 200, indicating the production of high levels of IL-1-like activity by the cell line. SPI-802 supernatant promoted the production of interleukin 2 (IL-2) by the Jurkat-F1884 T-cell line: Levels of IL-2 activity obtained with 15% SPI-802 supernatant were almost equivalent to those obtained with 50% adherent-cell IL-1 as estimated by the maximum proliferation of IL-2-dependent cytotoxic T cells. SPI-802 supernatant by itself exhibited no IL-2 activity. Major IL-1-like activity of SPI-802 supernatant was present in fractions from AcA54 columns corresponding to Mr 12,000-20,000 and 60,000-70,000 and resolved on isoelectrofocusing into two distinct species with pI values of 5.0 and 7.0, being consistent with the results of adherent-cell IL-1. The SPI-802 cell line having E receptors is an ideal source of a soluble factor with the biological and biochemical characteristics of human IL-1.
mesh_terms: D002460:Cell Line; D004912:Erythrocytes / Q000276:immunology; D006801:Humans; D007375:Interleukin-1 / Q000096:biosynthesis*; D007694:Killer Cells, Natural / Q000276:immunology; D007938:Leukemia / Q000276:immunology* / Q000473:pathology; D011971:Receptors, Immunologic / Q000032:analysis
chemical_list: D007375:Interleukin-1; D011971:Receptors, Immunologic