Abstract:
:We have recently reported the identification of four novel members of the interleukin-1 (IL-1) family which we designated as IL-1 homologue 1-4 (IL-1H1-4). These proteins exhibit significant sequence homology to other members of the IL-1 family. Of these homologues, only IL-1H4 (renamed IL-1F7b) was predicted to contain a propeptide domain and a caspase cleavage site. We now report that caspase-1 cleaves IL-1F7b at the predicted site to generate mature IL-1F7b. Caspase-4 was also able to process IL-1F7b, albeit inefficiently. Other caspases and Granzyme-B did not cleave IL-1F7b. Furthermore, adenovirus-mediated expression of IL-1F7b in HEK 293 cells led to in situ processing and secretion of mature IL-1F7b. In a screen to identify a potential receptor, both pro and mature IL-1F7b bound to the soluble IL-18 receptor alpha-Fc (IL-18Ralpha-Fc) but not to the soluble IL-1R-Fc or ST2R-Fc fusion proteins. Mature IL-1F7b bound to the IL-18Ralpha-Fc protein with higher affinity than the pro form, although the affinities for both proteins were significantly lower than that observed for IL-18. Consistent with this observation, only IL-18 and not IL-1F7b induced IFN-gamma production by KG1a cells. We also report that pro and mature IL-1F7b form homodimers with association constants of 4 microM and 5 nM, respectively, suggesting biological relevance to IL-1F7b processing. Finally, we have localized the expression of IL-1F7b protein in discrete cell populations including plasma cells and tumor cells. These data suggest that IL-1F7b may be involved in immune response, inflammatory diseases and/or cancer.
journal_name
Cytokinejournal_title
Cytokineauthors
Kumar S,Hanning CR,Brigham-Burke MR,Rieman DJ,Lehr R,Khandekar S,Kirkpatrick RB,Scott GF,Lee JC,Lynch FJ,Gao W,Gambotto A,Lotze MTdoi
10.1006/cyto.2002.0873keywords:
subject
Has Abstractpub_date
2002-04-21 00:00:00pages
61-71issue
2eissn
1043-4666issn
1096-0023pii
10.1006/cyto.2002.0873journal_volume
18pub_type
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