PMID- 10865972 OWN - NLM STAT- MEDLINE DCOM- 20000710 LR - 20190915 IS - 0887-6924 (Print) IS - 0887-6924 (Linking) VI - 14 IP - 6 DP - 2000 Jun TI - Expression and responsiveness of human interleukin-18 receptor (IL-18R) on hematopoietic cell lines. PG - 1052-9 AB - Interleukin-18 (IL-18) is a new inflammatory cytokine sharing biological functions with IL-12. The human IL-18 receptor (IL-18R) was recently identified and was found to be expressed on normal peripheral blood lymphocytes. To further characterize IL-18R, we analyzed IL-18R expression using a series of human hematopoietic cell lines selected from various cell lineages. We found the IL-18R expression on cells of T and B lineages as expected from analysis on normal cells. The IL-18R expression, however, was found not to be restricted to any specific maturation stages of T and B cells. In addition, we detected IL-18R expression in myeloid, monocytoid, erythroid and megakaryocytic cell lines, indicating that normal counterparts of these cell lineages could express IL-18R and participate in in vivo reactions caused by IL-18. Biochemical studies showed that IL-18R proteins exist as heterogeneous molecules ranging from 60 to 110 kDa. Deglycosylation experiments indicated that the heterogeneity could not be explained only by a difference in glycosylation. We also found that tumor necrosis factor-alpha (TNF-alpha) modulated the IL-18R expression, which implies an important in vivo effect of TNF-alpha on IL-18-induced reaction. Analyzing the responsiveness of IL-18R, we found that only KG-1 responded to IL-18 stimulation. This suggests that certain inhibitory mechanisms of IL-18 responsive genes are involved in the all IL-18R-positive cell lines except KG-1. FAU - Nakamura, S AU - Nakamura S AD - Fujisaki Cell Center, Hayashibara Biochemical Laboratories, Inc., Okayama, Japan. FAU - Otani, T AU - Otani T FAU - Okura, R AU - Okura R FAU - Ijiri, Y AU - Ijiri Y FAU - Motoda, R AU - Motoda R FAU - Kurimoto, M AU - Kurimoto M FAU - Orita, K AU - Orita K LA - eng PT - Journal Article PL - England TA - Leukemia JT - Leukemia JID - 8704895 RN - 0 (IL18R1 protein, human) RN - 0 (Interleukin-18) RN - 0 (Interleukin-18 Receptor alpha Subunit) RN - 0 (Receptors, Interleukin) RN - 0 (Receptors, Interleukin-18) RN - 0 (Tumor Necrosis Factor-alpha) RN - 187348-17-0 (Interleukin-12) SB - IM MH - B-Lymphocytes/immunology MH - Blotting, Western MH - Bone Marrow Cells/immunology/*metabolism MH - Cell Line, Transformed MH - Enzyme-Linked Immunosorbent Assay MH - Flow Cytometry MH - Glycosylation MH - Humans MH - Interleukin-12/pharmacology MH - Interleukin-18/metabolism MH - Interleukin-18 Receptor alpha Subunit MH - Receptors, Interleukin/*genetics/metabolism MH - Receptors, Interleukin-18 MH - T-Lymphocytes/immunology MH - Tumor Necrosis Factor-alpha/pharmacology MH - Up-Regulation EDAT- 2000/06/24 11:00 MHDA- 2000/07/15 11:00 CRDT- 2000/06/24 11:00 PHST- 2000/06/24 11:00 [pubmed] PHST- 2000/07/15 11:00 [medline] PHST- 2000/06/24 11:00 [entrez] AID - 10.1038/sj.leu.2401789 [doi] PST - ppublish SO - Leukemia. 2000 Jun;14(6):1052-9. doi: 10.1038/sj.leu.2401789.