Human Gene Set: WAGNER_APO2_SENSITIVITY


Standard name WAGNER_APO2_SENSITIVITY
Systematic name M13240
Brief description Genes whose expression most significantly correlated with cancer cell line sensitivity to the proapoptotic ligand APO2 [GeneID=8797].
Full description or abstract Apo2L/TRAIL stimulates cancer cell death through the proapoptotic receptors DR4 and DR5, but the determinants of tumor susceptibility to this ligand are not fully defined. mRNA expression of the peptidyl O-glycosyltransferase GALNT14 correlated with Apo2L/TRAIL sensitivity in pancreatic carcinoma, non-small-cell lung carcinoma and melanoma cell lines, and up to 30% of samples from various human malignancies showed GALNT14 overexpression. RNA interference of GALNT14 reduced cellular Apo2L/TRAIL sensitivity, whereas overexpression increased responsiveness. Biochemical analysis of DR5 identified several ectodomain O-(N-acetyl galactosamine-galactose-sialic acid) structures. Sequence comparison predicted conserved extracellular DR4 and DR5 O-glycosylation sites; progressive mutation of the DR5 sites attenuated apoptotic signaling. O-glycosylation promoted ligand-stimulated clustering of DR4 and DR5, which mediated recruitment and activation of the apoptosis-initiating protease caspase-8. These results uncover a new link between death-receptor O-glycosylation and apoptotic signaling, providing potential predictive biomarkers for Apo2L/TRAIL-based cancer therapy.
Collection C2: Curated
      CGP: Chemical and Genetic Perturbations
Source publication Pubmed 17767167   Authors: Wagner KW,Punnoose EA,Januario T,Lawrence DA,Pitti RM,Lancaster K,Lee D,von Goetz M,Yee SF,Totpal K,Huw L,Katta V,Cavet G,Hymowitz SG,Amler L,Ashkenazi A
Exact source Table 1aS, 1bS
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Source species Homo sapiens
Contributed by Jessica Robertson (MSigDB Team)
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identifier namespace		 AFFY_HG_U133
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Version history 3.0: First introduced

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