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Biochim Biophys Acta. 2007 Nov;1770(11):1528-37. Epub 2007 Aug 8.

Cloning and characterization of a novel caspase-10 isoform that activates NF-kappa B activity.

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Department of Life Science and Biotechnology, Shanghai Jiaotong University, 1954 Huashan Road, Shanghai, 200030, China.


Caspase-10 (also known as Mch4 and FLICE2) is an initiator caspase in the death receptor (DR)-dependent apoptotic pathway. So far six splice variants (caspase-10a-f) have been identified. Here we describe a novel isoform of the caspase-10 family named caspase-10g that is widely expressed in normal human tissues and various cell lines. Caspase-10g consists of 247 amino acids and does not contain the large or small subunit. A caspase-10g-specific exon is present between exon 5 and exon 6, which results in a protein product truncated shortly after the death-effector domain (DED)-containing prodomain. We further show that overexpression of caspase-10g dramatically enhances NF-kappaB activity in a dose- and time-dependent manner. Moreover, caspase-10g, unlike the protease-active caspase-10a, only promotes slight apoptosis when overexpressed in mammalian cells and it has no effect on caspase-10a-mediated apoptosis. Taken together, these results suggest that caspase-10g, as a novel prodomain-only isoform of caspase-10, may play a regulatory role preferentially in the NF-kappaB pathways.

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