Abstract:
:The role of the inhibitor of apoptosis (IAP) family members in tumor necrosis factor-α (TNF-α)-induced apoptosis of human gastric cancer MKN28 cells was explored. TNF-α induced up-regulation of cIAP2, whereas cycloheximide (CHX) induced down-regulation of XIAP and survivin. Degradation of cIAP1 and XIAP, but not survivin, was accelerated by co-treatment of cells with TNF-α and CHX, and TNF-α-induced up-regulation of cIAP2 was inhibited by BMS-345541 (NF-κB inhibitor). Treatment of MKN28 cells with TNF-α plus CHX induced degradation of survivin and activation of caspase-8 and -3, followed by degradation of cIAP1 and XIAP and apoptosis. Proteasome inhibitors (MG132 and epoxomicin) suppressed TNF-α plus CHX-induced degradation of survivin, cIAP1, and XIAP as well as apoptosis. A caspase inhibitor (z-VAD-fmk) suppressed TNF-α plus CHX-induced apoptosis, but allowed degradation of survivin, cIAP1 and XIAP. TNF-α receptor 1 and 2 were expressed on MKN28 cells. The magnitude of apoptosis induced by TNF-α plus BMS-345541 was much less than that induced by TNF-α plus CHX. These findings suggest that TNF-α plus CHX-induced apoptosis of gastric cancer MKN28 cells may be caused by accelerated degradation of the IAP family members (survivin, cIAP1, and XIAP), in addition to inhibition of NF-κB-dependent synthesis of anti-apoptotic molecules.
journal_name
Arch Biochem Biophysjournal_title
Archives of biochemistry and biophysicsauthors
Kitagawa M,Shiozaki A,Ichikawa D,Nakashima S,Kosuga T,Konishi H,Komatsu S,Fujiwara H,Okamoto K,Otsuji Edoi
10.1016/j.abb.2014.12.003subject
Has Abstractpub_date
2015-01-15 00:00:00pages
43-8eissn
0003-9861issn
1096-0384pii
S0003-9861(14)00405-6journal_volume
566pub_type
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