Nuclear extrusion precedes discharge of genomic DNA fibers during tunicamycin-induced neutrophil extracellular trap-osis (NETosis)-like cell death in cultured human leukemia cells

2016 ◽  
Vol 40 (5) ◽  
pp. 597-602 ◽  
Author(s):  
Tomofumi Nakayama ◽  
Noriko Saitoh ◽  
Keiko Morotomi-Yano ◽  
Ken-ichi Yano ◽  
Mitsuyoshi Nakao ◽  
...  
2016 ◽  
Vol 61 (3) ◽  
pp. 381-395 ◽  
Author(s):  
Carlos Quintana ◽  
Javier Cabrera ◽  
Juan Perdomo ◽  
Francisco Estévez ◽  
Juan F. Loro ◽  
...  

Toxins ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 527 ◽  
Author(s):  
Jing-Ting Chiou ◽  
Yi-Jun Shi ◽  
Liang-Jun Wang ◽  
Chia-Hui Huang ◽  
Yuan-Chin Lee ◽  
...  

Cardiotoxins (CTXs) are suggested to exert their cytotoxicity through cell membrane damage. Other studies show that penetration of CTXs into cells elicits mitochondrial fragmentation or lysosome disruption, leading to cell death. Considering the role of AMPK-activated protein kinase (AMPK) in mitochondrial biogenesis and lysosomal biogenesis, we aimed to investigate whether the AMPK-mediated pathway modulated Naja atra (Taiwan cobra) CTX3 cytotoxicity in U937 human leukemia cells. Our results showed that CTX3 induced autophagy and apoptosis in U937 cells, whereas autophagic inhibitors suppressed CTX3-induced apoptosis. CTX3 treatment elicited Ca2+-dependent degradation of the protein phosphatase 2A (PP2A) catalytic subunit (PP2Acα) and phosphorylation of AMPKα. Overexpression of PP2Acα mitigated the CTX3-induced AMPKα phosphorylation. CTX3-induced autophagy was via AMPK-mediated suppression of the Akt/mTOR pathway. Removal of Ca2+ or suppression of AMPKα phosphorylation inhibited the CTX3-induced cell death. CTX3 was unable to induce autophagy and apoptosis in U937 cells expressing constitutively active Akt. Met-modified CTX3 retained its membrane-perturbing activity, however, it did not induce AMPK activation and death of U937 cells. These results conclusively indicate that CTX3 induces autophagy and apoptosis in U937 cells via the Ca2+/PP2A/AMPK axis, and suggest that the membrane-perturbing activity of CTX3 is not crucial for the cell death signaling pathway induction.


2012 ◽  
Vol 322 (1) ◽  
pp. 107-112 ◽  
Author(s):  
Yukihiro Furusawa ◽  
Yoshisada Fujiwara ◽  
Mariame Ali Hassan ◽  
Yoshiaki Tabuchi ◽  
Akinori Morita ◽  
...  

2012 ◽  
Vol 428 (1) ◽  
pp. 116-120 ◽  
Author(s):  
María Teresa Marrero ◽  
Sara Estévez ◽  
Gledy Negrín ◽  
José Quintana ◽  
Mariana López ◽  
...  

2012 ◽  
Vol 22 (11) ◽  
pp. 3665-3670 ◽  
Author(s):  
María Teresa Marrero ◽  
Sara Tejera ◽  
Sara Estévez ◽  
José Quintana ◽  
Carlos Mayato ◽  
...  

2008 ◽  
Vol 108 (3) ◽  
pp. 824-832 ◽  
Author(s):  
Susanne U. Mertens-Talcott ◽  
Susan S. Percival ◽  
Stephen T. Talcott

2006 ◽  
Vol 312 (1) ◽  
pp. 27-39 ◽  
Author(s):  
A OCONNELL ◽  
C HOLOHAN ◽  
A TORRIGLIA ◽  
B LEE ◽  
C STENSONCOX

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