title: Glycogen synthase kinase-3 and Omi/HtrA2 induce annexin A2 cleavage followed by cell cycle inhibition and apoptosis.
abstract: Annexin A2 is involved in multiple cellular processes, including cell survival, growth, division, and differentiation. A lack of annexin A2 makes cells more sensitive to apoptotic stimuli. Here, we demonstrate a potential mechanism for apoptotic stimuli-induced annexin A2 cleavage, which contributes to cell cycle inhibition and apoptosis. Annexin A2 was persistently expressed around the proliferative but not the necrotic region in BALB/c nude mice with human lung epithelial carcinoma cell A549-derived tumors. Knockdown expression of annexin A2 made cells susceptible to either serum withdrawal-induced cell cycle inhibition or cisplatin-induced apoptosis. Under apoptotic stimuli, annexin A2 was time-dependently cleaved. Mechanistic studies have shown that protein phosphatase 2A (PP2A)-activated glycogen synthase kinase (GSK)-3 is essential for this process. Therefore, inhibiting GSK-3 reversed serum withdrawal-induced cell cycle inhibition and cisplatin-induced apoptosis. Furthermore, inhibiting serine proteases blocked apoptotic stimuli-induced annexin A2 cleavage. Bax activation and Mcl-1 destabilization, which is regulated by PP2A and GSK-3, caused annexin A2 cleavage via an Omi/HtrA2-dependent pathway. Taking these results together, we conclude that GSK-3 and Omi/HtrA2 synergistically cause annexin A2 cleavage and then cell cycle inhibition or apoptosis.
authors: Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan.
authors: Chi-Yun
authors: CY
authors: Wang
authors: Yee-Shin
authors: YS
authors: Lin
authors: Wu-Chou
authors: WC
authors: Su
authors: Chia-Ling
authors: CL
authors: Chen
authors: Chiou-Feng
authors: CF
authors: Lin
mesh_terms: D000818:Animals; D017306:Annexin A2 / Q000235:genetics / Q000378:metabolism*; D000970:Antineoplastic Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D015153:Blotting, Western; D002453:Cell Cycle / Q000187:drug effects / Q000502:physiology*; D045744:Cell Line, Tumor; D002945:Cisplatin / Q000494:pharmacology; D016895:Culture Media, Serum-Free / Q000494:pharmacology; D038362:Glycogen Synthase Kinase 3 / Q000235:genetics / Q000378:metabolism*; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D000074923:High-Temperature Requirement A Serine Peptidase 2; D006801:Humans; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D024101:Mitochondrial Proteins / Q000235:genetics / Q000378:metabolism*; D009154:Mutation; D009374:Neoplasms, Experimental / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D054648:Protein Phosphatase 2 / Q000378:metabolism; D034622:RNA Interference; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012697:Serine Endopeptidases / Q000235:genetics / Q000378:metabolism*; D014183:Transplantation, Heterologous; D051028:bcl-2-Associated X Protein / Q000378:metabolism
chemical_list: D017306:Annexin A2; D000970:Antineoplastic Agents; D016895:Culture Media, Serum-Free; D024101:Mitochondrial Proteins; D051028:bcl-2-Associated X Protein; D049452:Green Fluorescent Proteins; D038362:Glycogen Synthase Kinase 3; D054648:Protein Phosphatase 2; D012697:Serine Endopeptidases; C000615914:HTRA2 protein, human; D000074923:High-Temperature Requirement A Serine Peptidase 2; C000615915:Htra2 protein, mouse; D002945:Cisplatin