Rebamipide inhibits gastric cancer growth by targeting survivin and Aurora-B.
Rebamipide accelerates healing of gastric ulcers and gastritis but its actions on gastric cancer are not known. Survivin, an anti-apoptosis protein, is overexpressed in stem, progenitor, and cancer cells. In gastric cancer, increased and sustained survivin expression provides survival advantage and facilitates tumor progression and resistance to anti-cancer drugs. Aurora-B kinase is essential for chromosome alignment and mitosis progression but surprisingly its role in gastric cancer has not been explored. We examined in human gastric cancer AGS cells: (1) survivin expression, (2) localization of survivin and Aurora-B, (3) cell proliferation, and (4) effects of specific survivin siRNA and/or rebamipide (free radical scavenging drug) on survivin and Aurora-B expression and cell proliferation. Survivin and Aurora-B are strongly expressed in human AGS gastric cancer cells and co-localize during mitosis. Survivin siRNA significantly reduces AGS cell viability. Rebamipide significantly downregulates in AGS cell survivin expression, its association with Aurora-B and cell proliferation. Rebamipide-induced downregulation of survivin is at the transcription level and does not involve ubiquitin-proteasome pathway.
Tarnawski
A
A
Department of Medicine, VA Long Beach Healthcare System, 5901 E. 7th Street, Long Beach, CA 90822, USA. andrzej.tarnawski@med.va.gov
Pai
R
R
Chiou
S-K
SK
Chai
J
J
Chu
E C
EC
D000409:Alanine / Q000008:administration & dosage / Q000031:analogs & derivatives*; D064107:Aurora Kinase B; D064127:Aurora Kinases; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D016503:Drug Delivery Systems / Q000379:methods; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins; D008869:Microtubule-Associated Proteins / Q000378:metabolism*; D009363:Neoplasm Proteins / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D015363:Quinolones / Q000008:administration & dosage*; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000473:pathology*; D000077022:Survivin
C107489:BIRC5 protein, human; D051034:Inhibitor of Apoptosis Proteins; D008869:Microtubule-Associated Proteins; D009363:Neoplasm Proteins; D015363:Quinolones; D000077022:Survivin; C576921:AURKB protein, human; D064107:Aurora Kinase B; D064127:Aurora Kinases; D017346:Protein Serine-Threonine Kinases; C052785:rebamipide; D000409:Alanine