Bcl2L12 inhibits post-mitochondrial apoptosis signaling in glioblastoma

Stegh, A. H., Kim, H., Bachoo, R. M., Forloney, K. L., Zhang, J., Schulze, H., Park, K., Hannon, G. J., Yuan, J. Y., Louis, D. N., DePinho, R. A., Chin, L. (January 2007) Bcl2L12 inhibits post-mitochondrial apoptosis signaling in glioblastoma. Genes Dev, 21 (1). pp. 98-111. ISSN 0890-9369

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URL: https://www.ncbi.nlm.nih.gov/pubmed/17210792
DOI: 10.1101/gad.1480007

Abstract

Glioblastoma (GBM) is an astrocytic brain tumor characterized by an aggressive clinical course and intense resistance to all therapeutic modalities. Here, we report the identification and functional characterization of Bcl2L12 (Bcl2-like-12) that is robustly expressed in nearly all human primary GBMs examined. Enforced Bcl2L12 expression confers marked apoptosis resistance in primary cortical astrocytes, and, conversely, its RNA interference (RNAi)-mediated knockdown sensitizes human glioma cell lines toward apoptosis in vitro and impairs tumor growth with increased intratumoral apoptosis in vivo. Mechanistically, Bcl2L12 expression does not affect cytochrome c release or apoptosome-driven caspase-9 activation, but instead inhibits post-mitochondrial apoptosis signaling at the level of effector caspase activation. One of Bcl2L12's mechanisms of action stems from its ability to interact with and neutralize caspase-7. Notably, while enforced Bcl2L12 expression inhibits apoptosis, it also engenders a pronecrotic state, which mirrors the cellular phenotype elicited by genetic or pharmacologic inhibition of post-mitochondrial apoptosis molecules. Thus, Bcl2L12 contributes to the classical tumor biological features of GBM such as intense apoptosis resistance and florid necrosis, and may provide a target for enhanced therapeutic responsiveness of this lethal cancer.

Item Type: Paper
Subjects: organs, tissues, organelles, cell types and functions > cell types and functions > cell functions > apoptosis
organs, tissues, organelles, cell types and functions > organelles, types and functions > mitochondria
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > enzymes > kinase > tyrosine kinase
CSHL Authors:
Communities: CSHL labs > Hannon lab
Depositing User: CSHL Librarian
Date: January 2007
Date Deposited: 03 Nov 2011 13:44
Last Modified: 01 Dec 2016 17:24
PMCID: PMC1759904
Related URLs:
URI: http://repository.cshl.edu/id/eprint/23149

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