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BIRC5/Survivin enhances aerobic glycolysis and drug resistance by altered regulation of the mitochondrial fusion/fission machinery.
MedLine Citation:
PMID:  23146905     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Gain of chromosome 17q correlates with high-stage disease, an adverse clinical outcome and leads to the overexpression of the antiapoptotic protein BIRC5/Survivin in neuroblastoma (NB). We have shown before that Survivin defines a threshold for the sensitivity of NB cells to DNA-damaging chemotherapeutic agents that require FOXO3 activation for apoptosis induction. To investigate the molecular basis of apoptosis inhibition we analyzed the function of Survivin at mitochondria and uncovered that Survivin induces mitochondrial fragmentation, reduces mitochondrial respiration and represses BCL2L11/Bim. Mitochondrial fission depends on Survivin-induced recruitment of the fission regulator DNM1L/Drp1 to mitochondria. In parallel, Survivin expression inhibits the respiratory complex-I, thereby preventing reactive oxygen species accumulation and, as a consequence, FOXO3-induced apoptosis. The loss of energy production via oxidative phosphorylation is compensated by increased glycolysis in Survivin-overexpressing NB tumor cells. Glycolysis inhibitors neutralize the antiapoptotic effect of Survivin and sensitize high-stage NB to DNA-damaging drugs. This suggests that glycolysis inhibitors target an 'archilles heel' of Survivin-overexpressing NB and may be highly useful as chemosensitizers in the treatment of high-stage NB.Oncogene advance online publication, 12 November 2012; doi:10.1038/onc.2012.500.
Authors:
J Hagenbuchner; A V Kuznetsov; P Obexer; M J Ausserlechner
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-12
Journal Detail:
Title:  Oncogene     Volume:  -     ISSN:  1476-5594     ISO Abbreviation:  Oncogene     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8711562     Medline TA:  Oncogene     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1] Department of Pediatrics II, Medical University Innsbruck, Innsbruck, Austria [2] Tyrolean Cancer Research Institute, Innsbruck, Austria.
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