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• W3188951874 endingPage "2073" @default.
• W3188951874 startingPage "2073" @default.
• W3188951874 abstract "This study aimed to investigate the mechanistic pathway of Naja atra (Taiwan cobra) cardiotoxin 1 (CTX1)-induced death of leukemia cell lines U937 and HL-60. CTX1 increased cytoplasmic Ca2+ and reactive oxygen species (ROS) production, leading to the death of U937 cells. It was found that Ca2+-induced NOX4 upregulation promoted ROS-mediated p38 MAPK phosphorylation, which consequently induced c-Jun and ATF-2 phosphorylation. Using siRNA knockdown, activated c-Jun and ATF-2 were demonstrated to regulate the expression of Fas and FasL, respectively. Suppression of Ca2+-mediated NOX4 expression or ROS-mediated p38 MAPK activation increased the survival of U937 cells exposed to CTX1. FADD depletion abolished CTX1-induced cell death, caspase-8 activation, and t-Bid production, supporting the correlation between the Fas death pathway and CTX1-mediated cytotoxicity. Among the tested N. atra CTX isotoxins, only CTX1 induced Fas and FasL expression. Chemical modification studies revealed that intact Met residues were essential for the activity of CTX1 to upregulate Fas and FasL expression. Taken together, the data in this study indicate that CTX1 induces c-Jun-mediated Fas and ATF-2-mediated FasL transcription by the Ca2+/NOX4/ROS/p38 MAPK axis, thereby activating the Fas death pathway in U937 cells. Furthermore, CTX1 activates Fas/FasL death signaling in the leukemia cell line HL-60." @default.
• W3188951874 created "2021-08-16" @default.
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• W3188951874 date "2021-08-12" @default.
• W3188951874 modified "2023-09-25" @default.
• W3188951874 title "Naja atra Cardiotoxin 1 Induces the FasL/Fas Death Pathway in Human Leukemia Cells" @default.
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• W3188951874 doi "https://doi.org/10.3390/cells10082073" @default.
• W3188951874 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8394927" @default.
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• W3188951874 hasPublicationYear "2021" @default.
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