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排序方式: 共有209条查询结果,搜索用时 15 毫秒
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J J Lemasters K E Fleishman 《Biochemical and biophysical research communications》1987,142(1):176-182
Free energy changes for ATP synthesis (delta GP) and 2e(-)-transfer across Site 3 (delta GR) were determined during oxidative phosphorylation by rat liver mitochondria. At static head, -delta GR/delta GP ranged narrowly between 1.55 and 1.59 with five different respiratory substrates. Thus, an ATP/2e- of 1 1/2 at Site 3 is thermodynamically possible with regards to overall reactants and products. Using nonequilibrium thermodynamics, phenomenological stoichiometries were close to 1 1/2 for all substrates suggesting that ATP/2e- at Site 3 is, in fact, 1 1/2. An ATP/2e- of 1 1/2 can only be possible if H+/O is 4 for cytochrome oxidase. 相似文献
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D Taruscio C Morciano P Laricchiuta P Mincarone F Palazzo CG Leo S Sabina R Guarino J Auld T Sejersen D Gavhed K Ritchie M Hilton-Boon J Manson PG Kanavos D Tordrup V Tzouma Y Le Cam J Senecat G Filippini S Minozzi C Del Giovane H Schünemann JJ Meerpohl B Prediger L Schell R Stefanov G Iskrov T Miteva-Katrandzhieva P Serrano-Aguilar L Perestelo-Perez MM Trujillo-Martín J Pérez-Ramos A Rivero-Santana A Brand H van Kranen K Bushby A Atalaia J Ramet L Siderius M Posada I Abaitua-Borda V Alonso Ferreira M Hens-Pérez FJ Manzanares 《Orphanet journal of rare diseases》2014,9(Z1):O14
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The Mitochondrial Permeability Transition Is Required for Tumor Necrosis Factor Alpha-Mediated Apoptosis and Cytochrome c Release 总被引:21,自引:0,他引:21 下载免费PDF全文
Cynthia A. Bradham Ting Qian Konrad Streetz Christian Trautwein David A. Brenner John J. Lemasters 《Molecular and cellular biology》1998,18(11):6353-6364
This study assesses the controversial role of the mitochondrial permeability transition (MPT) in apoptosis. In primary rat hepatocytes expressing an IκB superrepressor, tumor necrosis factor alpha (TNFα) induced apoptosis as shown by nuclear morphology, DNA ladder formation, and caspase 3 activation. Confocal microscopy showed that TNFα induced onset of the MPT and mitochondrial depolarization beginning 9 h after TNFα treatment. Initially, depolarization and the MPT occurred in only a subset of mitochondria; however, by 12 h after TNFα treatment, virtually all mitochondria were affected. Cyclosporin A (CsA), an inhibitor of the MPT, blocked TNFα-mediated apoptosis and cytochrome c release. Caspase 3 activation, cytochrome c release, and apoptotic nuclear morphological changes were induced after onset of the MPT and were prevented by CsA. Depolarization and onset of the MPT were blocked in hepatocytes expressing ΔFADD, a dominant negative mutant of Fas-associated protein with death domain (FADD), or crmA, a natural serpin inhibitor of caspases. In contrast, Asp-Glu-Val-Asp-cho, an inhibitor of caspase 3, did not block depolarization or onset of the MPT induced by TNFα, although it inhibited cell death completely. In conclusion, the MPT is an essential component in the signaling pathway for TNFα-induced apoptosis in hepatocytes which is required for both cytochrome c release and cell death and functions downstream of FADD and crmA but upstream of caspase 3. 相似文献
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C Crone J Frokjaer-Jensen JJ Friedman O Christensen 《The Journal of general physiology》1978,71(2):195-220
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