Erschienen in:
01.07.2009 | Original Article
Stable XIAP knockdown clones of HCT116 colon cancer cells are more sensitive to TRAIL, taxanes and irradiation in vitro
verfasst von:
Kate Connolly, Richard Mitter, Morwenna Muir, Duncan Jodrell, Sylvie Guichard
Erschienen in:
Cancer Chemotherapy and Pharmacology
|
Ausgabe 2/2009
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Abstract
Purpose
To develop a model of X-linked inhibitor of apoptosis (XIAP) down regulation in colorectal cancer cell lines. This may be used to determine whether combination strategies have clinical potential.
Methods
A series of clones were developed using short hairpin RNA (shRNA) against XIAP stably expressed in HCT116 cells. XIAP mRNA and protein levels were established by RT-PCR and Immunoblot, respectively. GeneChip microarrays confirmed XIAP knockdown and absence of compensation by other IAP members.
Results
Four XIAP knockdown cell lines show 82–93% reduction in XIAP mRNA and 67–89% reduction in protein when compared to four luciferase control cell lines. XIAP knockdown sensitises cells to rhTRAIL by a factor of 3, to paclitaxel and docetaxel by a factor of >2 and, to a lesser extent, radiotherapy (20% enhancement).
Conclusions
Clinical trials with XIAP antisense continue, and these data suggest combination studies with agents such as rhTRAIL and taxanes should be undertaken.