LY294002 potentiates the anti-cancer effect of oxaliplatin for gastric cancer via death receptor pathway.

Abstract:

AIM:To examine the effects of combined treatment of oxaliplatin and phosphatidylinositol 3'-kinase inhibitor, 2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one (LY294002) for gastric cancer. METHODS:Cell viability was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Apoptotic cells were detected by flow cytometric analysis and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling assay. Western blotting and immuno-precipitation were used to examine protein expression and recruitment, respectively. Nuclear factor κB (NFκB) binding activities were investigated using electrophoretic mobility shift assay. Nude mice were used to investigate tumor growth. RESULTS:Treatment with combined oxaliplatin and LY294002 resulted in increased cell growth inhibition and cell apoptosis in vitro, and increased tumor growth inhibition and cell death in the tumor mass in vivo. In MKN45 and AGS cells, oxaliplatin treatment promoted both protein kinase B (Akt) and NFκB activation, while pretreatment with LY294002 significantly attenuated oxaliplatin-induced Akt activity and NFκB binding. LY294002 promoted oxaliplatin-induced Fas ligand (FasL) expression, Fas-associated death domain protein recruitment, caspase-8, Bid, and caspase-3 activation, and the short form of cellular caspase-8/FLICE-inhibitory protein (c-FLIP(S)) inhibition. In vivo, LY294002 inhibited oxaliplatin-induced activation of Akt and NFκB, and increased oxaliplatin-induced expression of FasL, inhibition of c-FLIP(S), and activation of caspase-8, Bid, and caspase-3. CONCLUSION:Combination of oxaliplatin and LY294002 was therapeutically promising for gastric cancer treatment. The enhanced sensitivity of the combined treatment was associated with the activation of the death receptor pathway.

journal_name

World J Gastroenterol

authors

Liu J,Fu XQ,Zhou W,Yu HG,Yu JP,Luo HS

doi

10.3748/wjg.v17.i2.181

subject

Has Abstract

pub_date

2011-01-14 00:00:00

pages

181-90

issue

2

eissn

1007-9327

issn

2219-2840

journal_volume

17

pub_type

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