PMID- 16331327 OWN - NLM STAT- MEDLINE DCOM- 20060223 LR - 20191210 IS - 1672-9145 (Print) IS - 1672-9145 (Linking) VI - 37 IP - 12 DP - 2005 Dec TI - Cloning and characterization of a new isoform of mouse interleukin-18. PG - 826-34 AB - Interleukin-18 (IL-18) is a novel proinflammatory cytokine with potent interferon (IFN)-lambda inducing activity that plays an important biological role in the enhancement of the activity of natural killer cells and cytotoxic T lymphocytes. In this study, we have identified a novel short form of IL-18 in mouse, named IL-18s. IL-18s might be an alternative splicing variant of IL-18 and its cDNA contains a 57 bp in-frame deletion. Like IL-18, IL-18s is also widely expressed in mouse tissues. It was suggested that IL-18s might have a caspase-1-dependent mechanism for maturation and secretion similar to that of IL-18: when transfected in COS-7 cells, pro-IL-18s (22 kDa) could be detected, and the mature IL-18s (16 kDa) could also be detected when combined with caspase-1. We observed that recombinant mouse IL-18s did not show any IL-18-like function, and IL-18s could enhance the ability of IL-18 to increase IFN-lambda production by approximately 40% in mouse splenocytes. This effect was observed primarily at relative low concentrations of IL-18, suggesting that IL-18s might regulate the activity of IL-18 in the physiological conditions. FAU - Yang, Yong-Jie AU - Yang YJ AD - Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences; Graduate School of the Chinese Academy of Sciences, Shanghai 200031 China. FAU - Wang, Zhao-Yuan AU - Wang ZY FAU - Chen, Song-Hua AU - Chen SH FAU - Ge, Xi-Rui AU - Ge XR LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - China TA - Acta Biochim Biophys Sin (Shanghai) JT - Acta biochimica et biophysica Sinica JID - 101206716 RN - 0 (Interleukin-18) RN - 0 (Protein Isoforms) RN - 82115-62-6 (Interferon-gamma) SB - IM MH - Animals MH - COS Cells MH - Chlorocebus aethiops MH - Cloning, Molecular MH - Interferon-gamma/metabolism MH - Interleukin-18/*chemistry/*genetics MH - Mice MH - Mice, Inbred BALB C MH - Protein Isoforms/chemistry/*metabolism EDAT- 2005/12/07 09:00 MHDA- 2006/02/24 09:00 CRDT- 2005/12/07 09:00 PHST- 2005/12/07 09:00 [pubmed] PHST- 2006/02/24 09:00 [medline] PHST- 2005/12/07 09:00 [entrez] AID - 10.1111/j.1745-7270.2005.00116.x [doi] PST - ppublish SO - Acta Biochim Biophys Sin (Shanghai). 2005 Dec;37(12):826-34. doi: 10.1111/j.1745-7270.2005.00116.x.