A Role for Voltage-Dependent Anion Channel Vdac1 in Polyglutamine-Mediated Neuronal Cell Death

The mitochondrial antiviral signaling protein MAVS (IPS-1, VISA, or Cardif) plays an important role in the host defense against viral infection by inducing type I interferon. Recent reports have shown that MAVS is also critical for virus-induced apoptosis. However, the mechanism of MAVS-mediated apoptosis induction remains unclear. Here, we show that MAVS binds to voltage-dependent anion channel 1 (VDAC1) and induces apoptosis by caspase-3 activation, which is independent of its role in innate immunity. MAVS modulates VDAC1 protein stability by decreasing its degradative K48-linked ubiquitination. In addition, MAVS knockout mouse embryonic fibroblasts (MEFs) display reduced VDAC1 expression with a consequent reduction of the vesicular stomatitis virus (VSV)-induced apoptosis response. Notably, the upregulation of VDAC1 triggered by VSV infection is completely abolished in MAVS knockout MEFs. We thus identify VDAC1 as a target of MAVS and describe a novel mechanism of MAVS control of virus-induced apoptotic cell death.

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Anion channel blockers attenuate delayed neuronal cell death induced by transient forebrain ischemia

Journal of Neuroscience Research ◽

10.1002/jnr.21279 ◽

2007 ◽

Vol 85 (7) ◽

pp. 1427-1435 ◽

Cited By ~ 33

Author(s):

Hana Inoue ◽

Hirokazu Ohtaki ◽

Tomoya Nakamachi ◽

Seiji Shioda ◽

Yasunobu Okada

Keyword(s):

Cell Death ◽

Neuronal Cell Death ◽

Neuronal Cell ◽

Anion Channel ◽

Channel Blockers ◽

Forebrain Ischemia ◽

Transient Forebrain Ischemia ◽

Delayed Neuronal Cell Death

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In self-defence: hexokinase promotes voltage-dependent anion channel closure and prevents mitochondria-mediated apoptotic cell death

Biochemical Journal ◽

10.1042/bj20031465 ◽

2004 ◽

Vol 377 (2) ◽

pp. 347-355 ◽

Cited By ~ 259

Author(s):

Heftsi AZOULAY-ZOHAR ◽

Adrian ISRAELSON ◽

Salah ABU-HAMAD ◽

Varda SHOSHAN-BARMATZ

Keyword(s):

Cell Death ◽

Cell Survival ◽

Molecular Mechanisms ◽

Apoptotic Cell ◽

Direct Interaction ◽

Anion Channel ◽

Mitochondrial Outer Membrane ◽

Voltage Dependent Anion Channel ◽

Metabolic Intermediate ◽

Voltage Dependent

In tumour cells, elevated levels of mitochondria-bound isoforms of hexokinase (HK-I and HK-II) result in the evasion of apoptosis, thereby allowing the cells to continue proliferating. The molecular mechanisms by which bound HK promotes cell survival are not yet fully understood. Our studies relying on the purified mitochondrial outer membrane protein VDAC (voltage-dependent anion channel), isolated mitochondria or cells in culture suggested that the anti-apoptotic activity of HK-I occurs via modulation of the mitochondrial phase of apoptosis. In the present paper, a direct interaction of HK-I with bilayer-reconstituted purified VDAC, inducing channel closure, is demonstrated for the first time. Moreover, HK-I prevented the Ca2+-dependent opening of the mitochondrial PTP (permeability transition pore) and release of the pro-apoptotic protein cytochrome c. The effects of HK-I on VDAC activity and PTP opening were prevented by the HK reaction product glucose 6-phosphate, a metabolic intermediate in most biosynthetic pathways. Furthermore, glucose 6-phosphate re-opened both the VDAC and the PTP closed by HK-I. The HK-I-mediated effects on VDAC and PTP were not observed using either yeast HK or HK-I lacking the N-terminal hydrophobic peptide responsible for binding to mitochondria, or in the presence of an antibody specific for the N-terminus of HK-I. Finally, HK-I overexpression in leukaemia-derived U-937 or vascular smooth muscle cells protected against staurosporine-induced apoptosis, with a decrease of up to 70% in cell death. These results offer insight into the mechanisms by which bound HK promotes tumour cell survival, and suggests that its overexpression not only ensures supplies of energy and phosphometabolites, but also reflects an anti-apoptotic defence mechanism.

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Functions of BCL-XLat the Interface between Cell Death and Metabolism

International Journal of Cell Biology ◽

10.1155/2013/705294 ◽

2013 ◽

Vol 2013 ◽

pp. 1-10 ◽

Cited By ~ 51

Author(s):

Judith Michels ◽

Oliver Kepp ◽

Laura Senovilla ◽

Delphine Lissa ◽

Maria Castedo ◽

...

Keyword(s):

Cell Death ◽

Mitochondrial Permeability Transition ◽

Atp Synthesis ◽

Anion Channel ◽

Permeability Transition ◽

Short Review ◽

Mitochondrial Outer Membrane ◽

Voltage Dependent Anion Channel ◽

Regulated Necrosis ◽

Voltage Dependent

The BCL-2 homolog BCL-XL, one of the two protein products ofBCL2L1, has originally been characterized for its prominent prosurvival functions. Similar to BCL-2, BCL-XLbinds to its multidomain proapoptotic counterparts BAX and BAK, hence preventing the formation of lethal pores in the mitochondrial outer membrane, as well as to multiple BH3-only proteins, thus interrupting apical proapoptotic signals. In addition, BCL-XLhas been suggested to exert cytoprotective functions by sequestering a cytosolic pool of the pro-apoptotic transcription factor p53 and by binding to the voltage-dependent anion channel 1 (VDAC1), thereby inhibiting the so-called mitochondrial permeability transition (MPT). Thus, BCL-XLappears to play a prominent role in the regulation of multiple distinct types of cell death, including apoptosis and regulated necrosis. More recently, great attention has been given to the cell death-unrelated functions of BCL-2-like proteins. In particular, BCL-XLhas been shown to modulate a number of pathophysiological processes, including—but not limited to—mitochondrial ATP synthesis, protein acetylation, autophagy and mitosis. In this short review article, we will discuss the functions of BCL-XLat the interface between cell death and metabolism.

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The voltage-dependent anion channel-1 modulates apoptotic cell death

Cell Death and Differentiation ◽

10.1038/sj.cdd.4401599 ◽

2005 ◽

Vol 12 (7) ◽

pp. 751-760 ◽

Cited By ~ 204

Author(s):

H Zaid ◽

S Abu-Hamad ◽

A Israelson ◽

I Nathan ◽

V Shoshan-Barmatz

Keyword(s):

Cell Death ◽

Apoptotic Cell ◽

Anion Channel ◽

Apoptotic Cell Death ◽

Voltage Dependent Anion Channel ◽

Voltage Dependent

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Direct modulation of the outer mitochondrial membrane channel, voltage-dependent anion channel 1 (VDAC1) by cannabidiol: a novel mechanism for cannabinoid-induced cell death

Cell Death and Disease ◽

10.1038/cddis.2013.471 ◽

2013 ◽

Vol 4 (12) ◽

pp. e949-e949 ◽

Cited By ~ 62

Author(s):

N Rimmerman ◽

D Ben-Hail ◽

Z Porat ◽

A Juknat ◽

E Kozela ◽

...

Keyword(s):

Cell Death ◽

Mitochondrial Membrane ◽

Anion Channel ◽

Outer Mitochondrial Membrane ◽

Voltage Dependent Anion Channel ◽

Membrane Channel ◽

Direct Modulation ◽

Voltage Dependent

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Voltage-dependent anion channels mediated apoptosis in refractory epilepsy

Open Medicine ◽

10.1515/med-2020-0113 ◽

2020 ◽

Vol 15 (1) ◽

pp. 745-753

Author(s):

Yan Zhao ◽

Wen-Jing Jiang ◽

Lin Ma ◽

Yan Lin ◽

Xing-Bang Wang

Keyword(s):

Cell Death ◽

Essential Role ◽

Refractory Epilepsy ◽

Apoptotic Cell ◽

Anion Channel ◽

Anion Channels ◽

Voltage Dependent Anion Channel ◽

Caspase 9 ◽

Voltage Dependent

AbstractThe purpose of this study was to investigate the role of voltage-dependent anion channel (VDAC) in mitochondria-mediated apoptosis of neurons in refractory epilepsy. Western blot analyses were carried out to detect the changes in cytochrome C, caspase 9, Bax, and Bcl-2. TUNEL assays were also carried out to investigate cell apoptosis under the upregulation and downregulation of VDAC1 with or without Bax or Bcl-2. VDAC1 induced Bax, Bcl-2, and caspase 9, increasing the release of cytochrome C. VDAC1 played an essential role in the apoptotic cell death of refractory epilepsy. It is concluded that VDAC1 plays an important role in refractory epilepsy and could be a possible therapeutic target of anti-epileptic drugs. The current study provides a new understanding of the possible mechanisms of refractory epilepsy.

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