Synchronism in mitochondrial ROS flashes, membrane depolarization and calcium sparks in human carcinoma cells.
Synchronism in mitochondrial ROS flashes, membrane depolarization and calcium sparks in human carcinoma cells.
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DOI:
10.1016/j.bbabio.2017.03.001
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发表时间:
2017-06
期刊:
影响因子:
--
通讯作者:
Grimm M
中科院分区:
文献类型:
--
作者:
Kuznetsov AV;Javadov S;Saks V;Margreiter R;Grimm M
Mitochondria are major producers of reactive oxygen species (ROS) in many cells including cancer cells. However, complex interrelationships between mitochondrial ROS (mitoROS), mitochondrial membrane potential (ΔΨm) and Ca2+ are not completely understood. Using human carcinoma cells, we further highlight biphasic ROS dynamics: - gradual mitoROS increase followed by mitoROS flash. Also, we demonstrate heterogeneity in rates of mitoROS generation and flash initiation time. Comparing mitochondrial and near-extra-mitochondrial signals, we show that mechanisms of mitoROS flashes in single mitochondria, linked to mitochondrial permeability transition pore opening (ΔΨm collapse) and calcium sparks, may involve flash triggering by certain levels of external ROS released from the same mitochondria. In addition, mitochondria-mitochondria interactions can produce wave propagations of mitoROS flashes and ΔΨm collapses in cancer cells similar to phenomena of ROS-induced ROS release (RIRR). Our data suggest that in cancer cells RIRR, activation of mitoROS flashes and mitochondrial depolarization may involve participation of extramitochondrial-ROS produced either by individual mitochondria and/or by neighboring mitochondria. This could represent general mechanisms in ROS-ROS signaling with suggested role in both mitochondrial and cellular physiology and signaling.
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影响因子:
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