期刊
CELL DEATH AND DIFFERENTIATION
卷 8, 期 6, 页码 649-657出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.cdd.4400881
关键词
caspase-1; inflammation; NF-kappa B; protein interaction; cloning
资金
- NIA NIH HHS [AG14357] Funding Source: Medline
We report here the identification and functional characterization of two new human caspase recruitment domain (CARD) molecules, termed Pseudo-interleukin-1 beta converting enzyme (ICE) and ICEBERG. Both proteins share a high degree of homology, reaching 92% and 53% identity, respectively, to the prodomain of caspase-1/ICE. Interestingly, both Pseudo-ICE and ICEBERG are mapped to chromosome 11q22 that bears caspases-1, -4- and -5 genes, all involved in cytokine production rather than in apoptosis, We demonstrate that Pseudo-ICE and ICEBERG interact physically with caspase-1 and block, in a monocytic cell line, the interferon-ii and lipopolysaccharide induced secretion of interleukin-1 beta which is a well-known consequence of caspase-1 activation. Moreover, Pseudo-ICE, but not ICEBERG, interacts with the CARD-containing kinase RICK/RIP2/CARDIAK and activates NF-kappaB. Our data suggest that Pseudo-ICE and ICEBERG are intracellular regulators of caspase-1 activation and could play a role in the regulation of IL-1 beta secretion and NF-kappaB activation du ring the pro-inflammatory cytokine response.
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