Chapter title |
Mitochondrial VDAC, the Na + /Ca 2+ Exchanger, and the Ca 2+ Uniporter in Ca 2+ Dynamics and Signaling
|
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Chapter number | 13 |
Book title |
Membrane Dynamics and Calcium Signaling
|
Published in |
Advances in experimental medicine and biology, January 2017
|
DOI | 10.1007/978-3-319-55858-5_13 |
Pubmed ID | |
Book ISBNs |
978-3-31-955857-8, 978-3-31-955858-5
|
Authors |
Varda Shoshan-Barmatz, Soumasree De, Shoshan-Barmatz, Varda, De, Soumasree |
Abstract |
Mitochondrial Ca2+ uptake and release play pivotal roles in cellular physiology by regulating intracellular Ca2+ signaling, energy metabolism, and cell death. Ca2+ transport across the inner and outer mitochondrial membranes (IMM, OMM, respectively), is mediated by several proteins, including the voltage-dependent anion channel 1 (VDAC1) in the OMM, and the mitochondrial Ca2+ uniporter (MCU) and Na+-dependent mitochondrial Ca2+ efflux transporter, (the NCLX), both in the IMM. By transporting Ca2+ across the OMM to the mitochondrial inner-membrane space (IMS), VDAC1 allows Ca2+ access to the MCU, facilitating transport of Ca2+ to the matrix, and also from the IMS to the cytosol. Intra-mitochondrial Ca2+ controls energy production and metabolism by modulating critical enzymes in the tricarboxylic acid (TCA) cycle and fatty acid oxidation. Thus, by transporting Ca2+, VDAC1 plays a fundamental role in regulating mitochondrial Ca2+ homeostasis, oxidative phosphorylation, and Ca2+ crosstalk among mitochondria, cytoplasm, and the endoplasmic reticulum (ER). VDAC1 has also been recognized as a key protein in mitochondria-mediated apoptosis, and apoptosis stimuli induce overexpression of the protein in a Ca2+-dependent manner. The overexpressed VDAC1 undergoes oligomerization leading to the formation of a channel, through which apoptogenic agents can be released. Here, we review the roles of VDAC1 in mitochondrial Ca2+ homeostasis, in apoptosis, and in diseases associated with mitochondria dysfunction. |
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Researcher | 3 | 8% |
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