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A novel splicing variant of mouse interleukin (IL)-24 antagonizes IL-24-induced apoptosis.


ABSTRACT: Alternative splicing of mRNA enables functionally diverse protein isoforms to be expressed from a single gene, allowing transcriptome diversification. Interleukin (IL)-24/MDA-7 is a member of the IL-10 gene family, and FISP (IL-4-induced secreted protein), its murine homologue, is selectively expressed and secreted by T helper 2 lymphocytes. A novel splice variant of mouse IL-24/FISP, designated FISP-sp, lacks 29 nucleotides from the 5'-end of exon 4 of FISP. The level of FISP-sp expression is 10% of the level of total primary FISP transcription. Unlike FISP, FISP-sp does not induce growth inhibition and apoptosis. FISP-sp is exclusively localized in endoplasmic reticulum, and its expression is up-regulated by endoplasmic reticulum stress. Our results suggest that the novel splicing variant FISP-sp dimerizes with FISP and blocks its secretion and inhibits FISP-induced apoptosis in vivo.

SUBMITTER: Sahoo A 

PROVIDER: S-EPMC2662000 | biostudies-literature | 2008 Oct

REPOSITORIES: biostudies-literature

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A novel splicing variant of mouse interleukin (IL)-24 antagonizes IL-24-induced apoptosis.

Sahoo Anupama A   Jung Yun Min YM   Kwon Ho-Keun HK   Yi Hwa-Jung HJ   Lee Suho S   Chang Sunghoe S   Park Zee-Yong ZY   Hwang Ki-Chul KC   Im Sin-Hyeog SH  

The Journal of biological chemistry 20080815 43


Alternative splicing of mRNA enables functionally diverse protein isoforms to be expressed from a single gene, allowing transcriptome diversification. Interleukin (IL)-24/MDA-7 is a member of the IL-10 gene family, and FISP (IL-4-induced secreted protein), its murine homologue, is selectively expressed and secreted by T helper 2 lymphocytes. A novel splice variant of mouse IL-24/FISP, designated FISP-sp, lacks 29 nucleotides from the 5'-end of exon 4 of FISP. The level of FISP-sp expression is 1  ...[more]

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