N-arachidonylglycine causes ROS production and cytochrome c release in liver mitochondria

2009 ◽  
Vol 47 (5) ◽  
pp. 585-592 ◽  
Author(s):  
Patrizia Zaccagnino ◽  
Maddalena Saltarella ◽  
Susanna D'Oria ◽  
Angela Corcelli ◽  
Matilde Sublimi Saponetti ◽  
...  
Keyword(s):  
Cytochrome C ◽  
Liver Mitochondria ◽  
Ros Production ◽  
Cytochrome C Release

Effect of chronic contractile activity on SS and IMF mitochondrial apoptotic susceptibility in skeletal muscle

2007 ◽  
Vol 292 (3) ◽  
pp. E748-E755 ◽  
Author(s):  
Peter J. Adhihetty ◽  
Vladimir Ljubicic ◽  
David A. Hood
Keyword(s):  
Skeletal Muscle ◽  
Cytochrome C ◽  
Manganese Superoxide Dismutase ◽  
Mitochondrial Permeability Transition ◽  
Contractile Activity ◽  
Permeability Transition Pore ◽  
Permeability Transition ◽  
Ros Production ◽  
Cytochrome C Release ◽  
Apoptosis Inducing Factor

Chronic contractile activity of skeletal muscle induces an increase in mitochondria located in proximity to the sarcolemma [subsarcolemmal (SS)] and in mitochondria interspersed between the myofibrils [intermyofibrillar (IMF)]. These are energetically favorable metabolic adaptations, but because mitochondria are also involved in apoptosis, we investigated the effect of chronic contractile activity on mitochondrially mediated apoptotic signaling in muscle. We hypothesized that chronic contractile activity would provide protection against mitochondrially mediated apoptosis despite an elevation in the expression of proapoptotic proteins. To induce mitochondrial biogenesis, we chronically stimulated (10 Hz; 3 h/day) rat muscle for 7 days. Chronic contractile activity did not alter the Bax/Bcl-2 ratio, an index of apoptotic susceptibility, and did not affect manganese superoxide dismutase levels. However, contractile activity increased antiapoptotic 70-kDa heat shock protein and apoptosis repressor with a caspase recruitment domain by 1.3- and 1.4-fold ( P < 0.05), respectively. Contractile activity elevated SS mitochondrial reactive oxygen species (ROS) production 1.4- and 1.9-fold ( P < 0.05) during states IV and III respiration, respectively, whereas IMF mitochondrial state IV ROS production was suppressed by 28% ( P < 0.05) and was unaffected during state III respiration. Following stimulation, exogenous ROS treatment produced less cytochrome c release (25–40%) from SS and IMF mitochondria, and also reduced apoptosis-inducing factor release (≈30%) from IMF mitochondria, despite higher inherent cytochrome c and apoptosis-inducing factor expression. Chronic contractile activity did not alter mitochondrial permeability transition pore (mtPTP) components in either subfraction. However, SS mitochondria exhibited a significant increase in the time to Vmax of mtPTP opening. Thus, chronic contractile activity induces predominantly antiapoptotic adaptations in both mitochondrial subfractions. Our data suggest the possibility that chronic contractile activity can exert a protective effect on mitochondrially mediated apoptosis in muscle.

Palmitoyl-CoA effect on cytochrome c release, a key process of apoptosis, from liver mitochondria of rat with sucrose diet-induced obesity

2021 ◽  
pp. 112351
Author(s):  
Miguel-Angel Barrios-Maya ◽  
Angélica Ruiz-Ramírez ◽  
Héctor Quezada ◽  
Carlos L. Céspedes Acuña ◽  
Mohammed El-Hafidi
Keyword(s):  
Cytochrome C ◽  
Liver Mitochondria ◽  
Cytochrome C Release ◽  
Diet Induced Obesity ◽  
Sucrose Diet

Cytochrome c release from rat liver mitochondria is compromised by increased saturated cardiolipin species induced by sucrose feeding

2015 ◽  
Vol 309 (9) ◽  
pp. E777-E786 ◽  
Author(s):  
Angélica Ruiz-Ramírez ◽  
Miguel-Angel Barrios-Maya ◽  
Ocarol López-Acosta ◽  
Dora Molina-Ortiz ◽  
Mohammed El-Hafidi
Keyword(s):  
Cytochrome C ◽  
Superoxide Radical ◽  
Lipid Membrane ◽  
Liver Mitochondria ◽  
Membrane Lipid ◽  
Rat Liver Mitochondria ◽  
Ros Generation ◽  
Cytochrome C Release ◽  
Mitochondrial Inner Membrane ◽  
Sucrose Feeding

Cytochrome c release from mitochondria has been described to be related to reactive oxygen species (ROS) generation. With ROS generation being increased in fatty liver from sucrose-fed (SF) rats, we hypothesized that cytochrome c release might be positively associated with H2O2 generation from SF mitochondria. Surprisingly, cytochrome c release from mitochondria of SF liver was found to be significantly lower compared with control (C) mitochondria oxidizing pyruvate/malate or succinate. Exposure of mitochondria to exogenous superoxide radical generated by the xanthine/xanthine oxidase system elicits a dose-response cytochrome c release in both control and SF mitochondria, but cytochrome c release remains lower in SF mitochondria compared with C mitochondria. Furthermore, the addition of ebselen, PEG-catalase, or catalase, a H2O2 scavenger, significantly reduces cytochrome c release from C and SF mitochondria. Our results suggest that both intra- and extramitochondrial H2O2 are involved in cytochrome c release, but the persisting difference between C and SF levels can be attributed to the differences in cardiolipin compositions. Indeed, the ratio of palmitic acid-rich cardiolipin species was found to be increased in lipid membrane from SF mitochondria compared with C mitochondria, whereas that of linoleic acid-rich cardiolipin species was found decreased. In addition, the content of tafazzin, a protein responsible for cardiolipin remodeling, was decreased in SF mitochondria. Therefore, we conclude that the changes observed in the composition of cardiolipin molecular species in SF mitochondria may be involved in cytochrome c interaction with mitochondrial inner membrane lipid and in its reduced release from SF mitochondria.

The endocannabinoid 2-arachidonoylglicerol decreases calcium induced cytochrome c release from liver mitochondria

2012 ◽  
Vol 44 (2) ◽  
pp. 273-280 ◽  
Author(s):  
Patrizia Zaccagnino ◽  
Susanna D’Oria ◽  
Luigi Luciano Romano ◽  
Almerinda Di Venere ◽  
Anna Maria Sardanelli ◽  
...  
Keyword(s):  
Cytochrome C ◽  
Liver Mitochondria ◽  
Cytochrome C Release

Palladacycles catalyse the oxidation of critical thiols of the mitochondrial membrane proteins and lead to mitochondrial permeabilization and cytochrome c release associated with apoptosis

2008 ◽  
Vol 417 (1) ◽  
pp. 247-256 ◽  
Author(s):  
Débora P. Santana ◽  
Priscila A. Faria ◽  
Edgar J. Paredes-Gamero ◽  
Antonio C. F. Caires ◽  
Iseli L. Nantes ◽  
...  
Keyword(s):  
Membrane Proteins ◽  
Cytochrome C ◽  
Disulfide Bonds ◽  
Mitochondrial Membrane ◽  
Apoptotic Cell ◽  
Liver Mitochondria ◽  
Rat Liver Mitochondria ◽  
Cytochrome C Release ◽  
Mitochondrial Permeabilization

Permeabilization of the mitochondrial membrane has been extensively associated with necrotic and apoptotic cell death. Similarly to what had been previously observed for B16F10-Nex2 murine melanoma cells, PdC (palladacycle compounds) obtained from the reaction of dmpa (N,N-dimethyl-1-phenethylamine) with the dppe [1,2-ethanebis(diphenylphosphine)] were able to induce apoptosis in HTC (hepatoma, tissue culture) cells, presenting anticancer activity in vitro. To elucidate cell site-specific actions of dmpa:dppe that could respond to the induction of apoptosis in cancer cells in the present study, we investigated the effects of PdC on isolated RLM (rat liver mitochondria). Our results showed that these palladacycles are able to induce a Ca2+-independent mitochondrial swelling that was not inhibited by ADP, Mg2+ and antioxidants. However, the PdC-induced mitochondrial permeabilization was partially prevented by pre-incubation with CsA (cyclosporin A), NEM (N-ethylmaleimide) and bongkreic acid and totally prevented by DTT (dithiothreitol). A decrease in the content of reduced thiol groups of the mitochondrial membrane proteins was also observed, as well as the presence of membrane protein aggregates in SDS/PAGE without lipid and GSH oxidation. FTIR (Fourier-transform IR) analysis of PdC-treated RLM demonstrated the formation of disulfide bonds between critical thiols in mitochondrial membrane proteins. Associated with the mitochondrial permeabilization, PdC also induced the release of cytochrome c, which is sensitive to inhibition by DTT. Besides the contribution to clarify the pro-apoptotic mechanism of PdC, this study shows that the catalysis of specific protein thiol cross-linkage is enough to induce mitochondrial permeabilization and cytochrome c release.

Ceramide induces cytochrome c release from isolated mitochondria

1999 ◽  
Vol 66 ◽  
pp. 27-31 ◽  
Author(s):  
Christoph Richter ◽  
Pedram Ghafourifar
Keyword(s):  
Cytochrome C ◽  
Membrane Integrity ◽  
Liver Mitochondria ◽  
Rat Liver Mitochondria ◽  
Cytochrome C Release ◽  
Mitochondrial Oxygen Consumption ◽  
Mitochondrial Functions ◽  
Cyt C ◽  
C6 Ceramide

This chapter addresses the role of mitochondria in apoptosis. Emphasis is put on the recently observed influence of ceramides on mitochondrial functions. We report here that N-acetylsphingosine (C2-ceramide), N-hexanoylsphingosine (C6-ceramide) and, to a much lesser extent, C2-dihydroceramide, induce cytochrome c (cyt c) release from isolated rat liver mitochondria. Ceramide-induced cyt c release is prevented by a low concentration of Bcl-2. The release takes place when cyt c is oxidized, but not when it is reduced. Upon cyt c release mitochondrial oxygen consumption, mitochondrial transmembrane potential (ΔΨm) and Ca2+ retention are diminished. Bcl-2 prevents, and addition of cyt c reverses, the alteration of these mitochondrial functions. In ATP-energized mitochondria ceramides do not alter ΔΨm, neither when cyt c is oxidized nor when it is reduced. This rules out a non-specific disturbance by ceramides of mitochondrial-membrane integrity. It is concluded that some of the apoptogenic properties of ceramides are mediated via their interaction with mitochondrial cyt c followed by its release.

Potassium channel openers protect cardiac mitochondria by attenuating oxidant stress at reoxygenation

2002 ◽  
Vol 282 (2) ◽  
pp. H531-H539 ◽  
Author(s):  
Cevher Ozcan ◽  
Martin Bienengraeber ◽  
Petras P. Dzeja ◽  
Andre Terzic
Keyword(s):  
Cytochrome C ◽  
Structural Integrity ◽  
Oxidant Stress ◽  
Fatty Acid Derivative ◽  
Membrane Integrity ◽  
Radical Scavenger ◽  
Maximal Effect ◽  
Ros Production ◽  
Cytochrome C Release ◽  
Channel Opener

K+ channel openers have been recently recognized for their ability to protect mitochondria from anoxic injury. Yet the mechanism responsible for mitochondrial preservation under oxidative stress is not fully understood. Here, mitochondria were isolated from rat hearts and subjected to 20-min anoxia, followed by reoxygenation. At reoxygenation, increased generation of reactive oxygen species (ROS) was associated with reduced ADP-stimulated oxygen consumption, blunted ATP production, and disrupted mitochondrial structural integrity coupled with cytochrome c release. The prototype K+ channel opener diazoxide markedly reduced mitochondrial ROS production at reoxygenation with a half-maximal effect of 29 μM. Diazoxide also preserved oxidative phosphorylation and mitochondrial membrane integrity, as indicated by electron microscopy and reduced cytochrome c release. The protective effect of diazoxide was reproduced by the structurally distinct K+ channel opener nicorandil and antagonized by 5-hydroxydecanoic acid, a short-chain fatty acid derivative and presumed blocker of mitochondrial ATP-sensitive K+ channels. Opener-mediated mitochondrial protection was simulated by the free radical scavenger system composed of superoxide dismutase and catalase. However, the effect of openers on ROS production was maintained in nominally K+-free medium in the presence or absence of the K+ ionophore valinomycin and was mimicked by malonate, a modulator of the mitochondrial redox state. This suggests the existence of a K+ conductance-independent pathway for mitochondrial protection targeted by K+ channel openers. Thus the cardioprotecive mechanism of K+ channel openers includes direct attenuation of mitochondrial oxidant stress at reoxygenation.

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