alexa Identification and characterization of Ich-3, a member of the interleukin-1beta converting enzyme (ICE) Ced-3 family and an upstream regulator of ICE.
Biochemistry

Biochemistry

Biochemistry & Physiology: Open Access

Author(s): Wang S, Miura M, Jung Yk, Zhu H, Gagliardini V,

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Abstract We report here the isolation and characterization of a new member of the ice/ced-3 family of cell death genes, named ich-3. The predicted amino acid sequence of Ich-3 protein shares 54\% identity with murine interleukin-1beta converting enzyme (ICE). Overexpression of ich-3 in Rat-1 and HeLa cells induces apoptosis, which can be inhibited by CrmA and Bcl-2. The mRNA and proteins of ich-3 are dramatically induced in vivo upon stimulation with lipopolysaccharide, an inducer of septic shock. The ich-3 gene product can be cleaved by cytotoxic T cells granule serine protease granzyme B, suggesting that Ich-3 may mediate apoptosis induced by granzyme B. Ich-3 does not process proIL-1beta directly but does promote proIL-1beta processing by ICE. These results suggest that Ich-3 may play a very important role in apoptosis and inflammatory responses and may be an upstream regulator of ICE.
This article was published in J Biol Chem and referenced in Biochemistry & Physiology: Open Access

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