From mitochondrial dynamics to arrhythmias.
From mitochondrial dynamics to arrhythmias.
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DOI:
10.1016/j.biocel.2009.02.016
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发表时间:
2009-10
影响因子:
4
通讯作者:
O'Rourke, B.
中科院分区:
文献类型:
--
作者:
Aon, M. A.;Cortassa, S.;Akar, F. G.;Brown, D. A.;Zhou, L.;O'Rourke, B.
关键词:
The ROS-dependent mitochondrial oscillator described in cardiac cells exhibits at least two modes of function under physiological conditions or in response to metabolic and oxidative stress. Both modes depend upon network behavior of mitochondria. Under physiological conditions cardiac mitochondria behave as a network of coupled oscillators with a broad range of frequencies. ROS weakly couples mitochondria under normal conditions but becomes a strong coupling messenger when, under oxidative stress, the mitochondrial network attains criticality. Mitochondrial criticality is achieved when a threshold of ROS is overcome and a certain density of mitochondria forms a cluster that spans the whole cell. Under these conditions, the slightest perturbation triggers a cell wide collapse of the mitochondrial membrane potential, ΔΨm, visualized as a depolarization wave throughout the cell which is followed by whole cell synchronized oscillations in ΔΨm, NADH, ROS, and GSH. This dynamic behavior scales from the mitochondrion to the cell by driving cellular excitability and the whole heart into catastrophic arrhythmias. A network collapse of ΔΨm under criticality leads to: i) energetic failure, ii) temporal and regional alterations in action potential (AP), iii) development of zones of impaired conduction in the myocardium, and, ultimately, iv) a fatal ventricular arrhythmia.
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DOI:
10.1042/bss0660167
发表时间:
1999-01-01
期刊:
MITOCHONDRIA AND CELL DEATH
影响因子:
--
作者:
Crompton, M;Virji, S;Ward, JM
通讯作者:
Ward, JM
DOI:
10.1073/pnas.0307156101
发表时间:
2004-03-30
影响因子:
11.1
作者:
Aon, MA;Cortassa, S;O'Rourke, B
通讯作者:
O'Rourke, B
DOI:
10.1073/pnas.95.2.510
发表时间:
1998-01-20
影响因子:
11.1
作者:
Lucas, DT;Szweda, LI
通讯作者:
Szweda, LI
影响因子:
4.8
作者:
Aon, Miguel A.;Cortassa, Sonia;O'Rourke, Brian
通讯作者:
O'Rourke, Brian
影响因子:
3.4
作者:
Brady, NR;Elmore, SP;Westerhoff, HV
通讯作者:
Westerhoff, HV