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• W2091256286 abstract "Targeting to mitochondria is emerging as a common strategy that bacteria utilize to interact with these central executioners of apoptosis. Several lines of evidence have in fact indicated mitochondria as specific targets for bacterial protein toxins, regarded as the principal virulence factors of pathogenic bacteria. This work shows, for the first time, the ability of the Clostridium difficile toxin B (TcdB), a glucosyltransferase that inhibits the Rho GTPases, to impact mitochondria. In living cells, TcdB provokes an early hyperpolarization of mitochondria that follows a calcium-associated signaling pathway and precedes the final execution step of apoptosis (i.e. mitochondria depolarization). Importantly, in isolated mitochondria, the toxin can induce a calcium-dependent mitochondrial swelling, accompanied by the release of the proapoptogenic factor cytochrome c. This is consistent with a mitochondrial targeting that does not require the Rho-inhibiting activity of the toxin. Of interest, the mitochondrial ATP-sensitive potassium channels are also involved in the apoptotic response to TcdB and appear to be crucial for the cell death execution phase, as demonstrated by using specific modulators of these channels. To our knowledge, the involvement of these mitochondrial channels in the ability of a bacterial toxin to control cell fate is a hitherto unreported finding." @default.
• W2091256286 created "2016-06-24" @default.
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• W2091256286 date "2007-03-01" @default.
• W2091256286 modified "2023-10-18" @default.
• W2091256286 title "Clostridium difficile Toxin B Causes Apoptosis in Epithelial Cells by Thrilling Mitochondria" @default.
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• W2091256286 doi "https://doi.org/10.1074/jbc.m607614200" @default.
• W2091256286 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17220295" @default.
• W2091256286 hasPublicationYear "2007" @default.
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