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• W2020670611 abstract "A key step in the initiation of apoptosis is the release from the mitochondrial intermembrane space of cytochrome c and other pro-apoptotic proteins such as Smac/DIABLO, Omi/HtrA2, apoptosis-inducing factor (AIF), and endonuclease G (EndoG). Discrepancies have arisen, however, as to whether all these proteins are released in different systems. Our results suggest that failure to observe cytochrome c release may be due to the use of different buffers because after permeabilization by caspase-8 cleaved human Bid (tBid), cytochrome c dissociation from mitochondria was highly dependent on ionic strength and required 50-80 mm KCl, NaCl, or LiCl. In addition, mitochondria isolated from apoptotic cells using low ionic strength buffer bound a greater proportion of endogenous cytochrome c. In contrast to cytochrome c, Smac/DIABLO and Omi/HtrA2 were released independent of ionic strength, and AIF and EndoG behaved as if they are exposed to the intermembrane space but tethered to or within the inner membrane. AIF and EndoG were also not released by active caspases, which suggests their involvement in apoptosis may be limited. In summary, whereas tBid permeabilizes the outer membrane to cytochrome c, Smac/DIABLO, and Omi/HtrA2, the release of cytochrome c during apoptosis will be underestimated unless sufficient ionic strength is maintained to overcome the electrostatic association of cytochrome c with membranes." @default.
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• W2020670611 date "2005-01-01" @default.
• W2020670611 modified "2023-10-12" @default.
• W2020670611 title "Mitochondrial Release of Pro-apoptotic Proteins" @default.
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• W2020670611 doi "https://doi.org/10.1074/jbc.m411106200" @default.
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