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    Down-regulation of XIAP by AEG35156 in paediatric tumour cells induces apoptosis and sensitises cells to cytotoxic agents.

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    Authors
    Holt, Sarah V
    Brookes, Karen E
    Dive, Caroline
    Makin, Guy W J
    Affiliation
    Clinical and Experimental Pharmacology, Paterson Institute for Cancer Research, Manchester Cancer Research Centre, The University of Manchester, Wilmslow Road, Manchester M20 4BX, UK.
    Issue Date
    2011-04
    
    Metadata
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    Abstract
    Resistance to conventional chemotherapy is a major problem in several paediatric tumours. One explanation for this is that tumour cells are unable to engage apoptosis after cytotoxic drug-induced damage. Inhibitor of apoptosis proteins (IAPs) function by inhibiting both effector (9) and initiator (3 and 7) caspases. Repression of the widely expressed X-linked IAP (XIAP) by RNAi sensitises adult tumour cells to cytotoxics in vitro. Antisense oligonucleotide (ASO)-induced down-regulation of XIAP is effective at inducing cell death and delaying the growth of adult tumour cells as xenografts and these agents are currently in phase II clinical trials. The importance of XIAP in paediatric tumours has not been characterised but high expression correlates with poor survival in childhood AML. We have used the novel XIAP ASO (AEG35156) to evaluate the effects of down-regulation of XIAP in paediatric tumour cells. Here, we show that AEG35156 can down-regulate XIAP in a number of paediatric cell lines including models of osteosarcoma, rhabdomyosarcoma and Ewing's sarcoma. Cell death assays demonstrated a higher proportion of dead cells after XIAP down-regulation by ASO and these cells displayed increased levels of cleaved caspase-3 and cleaved PARP, showing cell death was due to apoptosis. In long-term clonogenic assays, XIAP ASO sensitised 791T osteosarcoma cells to doxorubicin, etoposide and vincristine. The work presented here suggests that AEG35156, as a monotherapy or in combination with cytotoxic agents, may be of benefit in the treatment of paediatric tumours.
    Citation
    Down-regulation of XIAP by AEG35156 in paediatric tumour cells induces apoptosis and sensitises cells to cytotoxic agents. 2011, 25 (4):1177-81 Oncol. Rep.
    Journal
    Oncology Reports
    URI
    http://hdl.handle.net/10541/200911
    DOI
    10.3892/or.2011.1167
    PubMed ID
    21286665
    Type
    Article
    Language
    en
    ISSN
    1791-2431
    ae974a485f413a2113503eed53cd6c53
    10.3892/or.2011.1167
    Scopus Count
    Collections
    All Christie Publications
    All Paterson Institute for Cancer Research

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