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Título: | Mechanism of mitochondrial glutathione-dependent hepatocellular susceptibility to TNF despite NF-κB Activation |
Autor: | Marí, Montserrat CSIC ORCID ; Colell Riera, Anna CSIC ORCID; Morales, Albert CSIC ORCID; Caballero, Francisco CSIC; Moles, Anna CSIC ORCID; Fernández, Anna; Terrones, Oihana CSIC ORCID; Basáñez, Gorka CSIC ORCID; García-Ruiz, Carmen CSIC ORCID ; Fernández-Checa, José C. CSIC ORCID | Fecha de publicación: | may-2008 | Editor: | Elsevier | Citación: | Gastroenterology 134(5): 1507-1520 (2008) | Resumen: | [Background & Aims]: Nuclear factor κB (NF-κB) is the master regulator of tumor necrosis factor (TNF) susceptibility. Although mitochondrial glutathione (mGSH) depletion was shown to sensitize hepatocytes to TNF despite NF-κB activation, the mechanisms involved, particularly the role of Bax oligomerization and mitochondrial outer membrane (MOM) permeabilization, 2 critical steps in cell death, remained unexplored. [Methods]: TNF signaling at the premitochondrial and mitochondrial levels was analyzed in primary mouse hepatocytes with or without mGSH depletion. [Results]: Unexpectedly, we observed that TNF activates caspase-8 independently of NF-κB inactivation, causing Bid cleavage and mitochondrial Bax oligomerization. However, their predicted consequences on MOM permeabilization, cytochrome c release, caspase-3 activation, and hepatocellular death occurred only on mGSH depletion. These events were preceded by stimulated mitochondrial reactive oxygen species that predominantly oxidized cardiolipin, changes not observed in acidic sphingomyelinase (ASMase)−/− hepatocytes. Oxidized cardiolipin potentiated oligomerized Bax-induced MOM-like liposome permeabilization by restructuring the lipid bilayer, without effect on membrane Bax insertion or oligomerization. ASMase−/− mice with mGSH depletion by cholesterol loading were resistant to TNF-induced liver injury in vivo. [Conclusions]: Thus, MOM-localized oligomeric Bax is not sufficient for TNF-induced MOM permeabilization and cell death requiring mGSH-controlled ASMase-mediated mitochondrial membrane remodeling by oxidized cardiolipin generation. |
Versión del editor: | http://dx.doi.org/10.1053/j.gastro.2008.01.073 | URI: | http://hdl.handle.net/10261/37325 | DOI: | 10.1053/j.gastro.2008.01.073 | ISSN: | 0016-5085 | E-ISSN: | 1528-0012 |
Aparece en las colecciones: | (IIBB) Artículos (IBF) Artículos |
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