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- W2136304861 abstract "Oxidized low density lipoproteins (oxLDL) participate in atherosclerosis plaque formation, rupture, and subsequent thrombosis. Because oxLDL are toxic to cultured cells and Bcl-2 protein prevents apoptosis, the present work aimed to study whether Bcl-2 may counterbalance the toxicity of oxLDL. Two experimental model systems were used in which Bcl-2 levels were modulated: 1) lymphocytes in which the (high) basal level of Bcl-2 was reduced by antisense oligonucleotides; 2) HL60 and HL60/B (transduced by Bcl-2) expressing low and high Bcl-2 levels, respectively. In cells expressing relatively high Bcl-2 levels (lymphocytes and HL60/B), oxLDL induced mainly primary necrosis. In cells expressing low Bcl-2 levels (antisense-treated lymphocytes, HL60 and ECV-304 endothelial cells), the rate of oxLDL-induced apoptosis was higher than that of primary necrosis. OxLDL evoked a sustained calcium rise, which is a common trigger to necrosis and apoptosis since both types of cell death were blocked by the calcium chelator EGTA. Conversely, a sustained calcium influx elicited by the calcium ionophore A23187 induced necrosis in cells expressing high Bcl-2 levels and apoptosis in cells expressing low Bcl-2 levels. This suggests that Bcl-2 acts downstream from the calcium peak and inhibits only the apoptotic pathway, not the necrosis pathway, thus explaining the apparent shift from oxLDL-induced apoptosis toward necrosis when Bcl-2 is overexpressed." @default.
- W2136304861 created "2016-06-24" @default.
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- W2136304861 date "1999-03-01" @default.
- W2136304861 modified "2023-09-27" @default.
- W2136304861 title "Bcl‐2 alters the balance between apoptosis and necrosis, but does not prevent cell death induced by oxidized low density lipoproteins" @default.
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- W2136304861 doi "https://doi.org/10.1096/fasebj.13.3.485" @default.
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