期刊
CELL DEATH AND DIFFERENTIATION
卷 17, 期 2, 页码 278-290出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/cdd.2009.123
关键词
Bax; cellular automaton; FRET; mitochondrial outer membrane permeabilisation; systems biology
资金
- Science Foundation Ireland [03/RP1/B344, 08/IN1/1949]
- Irish Health Research Board [RP/2006/258]
- National Biophotonics and Imaging Platform Ireland
- European Union
- Siemens Ireland
- Science Foundation Ireland (SFI) [03/RP1/B344] Funding Source: Science Foundation Ireland (SFI)
Mitochondrial outer membrane permeabilisation (MOMP) during apoptosis is triggered by the activation and oligomerisation of Bax and Bak, but a quantification of these processes in individual cells has not yet been performed. Single-cell imaging of Bax translocation and oligomerisation in Bax-deficient DU-145 cells expressing CFP-Bax and YFP-Bax revealed that both processes started only minutes before or concomitantly with MOMP, with the majority of Bax translocation and oligomerisation occurring downstream of MOMP. Quantification of YFP-Bax concentrations at mitochondria revealed an increase of only 1.8 +/- 1.5% at MOMP onset. This was increased to 11.2 +/- 3.6% in bak-silenced cells. These data suggested that Bax activation exceeded by far the quantities required for MOMP induction, and that minimal Bax or Bak activation may be sufficient to trigger rapid pore formation. In a cellular automaton modelling approach that incorporated the quantities and movement probabilities of Bax and its inhibitors, activators and enablers in the mitochondrial membrane, we could re-model rapid pore formation kinetics at submaximal Bax activation. Cell Death and Differentiation (2010) 17, 278-290; doi:10.1038/cdd.2009.123; published online 11 September 2009
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