1
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Pavón N, Buelna-Chontal M, Correa F, Yoval-Sánchez B, Belmont J, Hernández-Esquivel L, Rodríguez-Zavala JS, Chávez E. Tamoxifen inhibits mitochondrial membrane damage caused by disulfiram. Biochem Cell Biol 2017; 95:556-562. [DOI: 10.1139/bcb-2017-0027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In this work, we studied the protective effects of tamoxifen (TAM) on disulfiram (Dis)-induced mitochondrial membrane insult. The results indicate that TAM circumvents the inner membrane leakiness manifested as Ca2+ release, mitochondrial swelling, and collapse of the transmembrane electric gradient. Furthermore, it was found that TAM prevents inactivation of the mitochondrial enzyme aconitase and detachment of cytochrome c from the inner membrane. Interestingly, TAM also inhibited Dis-promoted generation of hydrogen peroxide. Given that TAM is an antioxidant molecule, it is plausible that its protection may be due to the inhibition of Dis-induced oxidative stress.
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Affiliation(s)
- Natalia Pavón
- Departamento de Farmacología, Instituto Nacional de Cardiología “Ignacio Chávez”, México D.F
| | - Mabel Buelna-Chontal
- Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiología “Ignacio Chávez”, México D.F
| | - Francisco Correa
- Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiología “Ignacio Chávez”, México D.F
| | - Belem Yoval-Sánchez
- Departamento de Bioquímica, Instituto Nacional de Cardiología “Ignacio Chávez”, México D.F
| | - Javier Belmont
- Departamento de Bioquímica, Instituto Nacional de Cardiología “Ignacio Chávez”, México D.F
| | - Luz Hernández-Esquivel
- Departamento de Bioquímica, Instituto Nacional de Cardiología “Ignacio Chávez”, México D.F
| | | | - Edmundo Chávez
- Departamento de Bioquímica, Instituto Nacional de Cardiología “Ignacio Chávez”, México D.F
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2
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Buelna-Chontal M, Franco M, Hernández-Esquivel L, Pavón N, Rodríguez-Zavala JS, Correa F, Jasso R, Pichardo-Ramos G, Santamaría J, González-Pacheco H, Soto V, Díaz-Ruíz JL, Chávez E. CDP-choline circumvents mercury-induced mitochondrial damage and renal dysfunction. Cell Biol Int 2017; 41:1356-1366. [PMID: 28884894 DOI: 10.1002/cbin.10871] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 09/02/2017] [Indexed: 11/06/2022]
Abstract
Heavy metal ions are known to produce harmful alterations on kidney function. Specifically, the accumulation of Hg2+ in kidney tissue may induce renal failure. In this work, the protective effect of CDP-choline against the deleterious effects induced by Hg2+ on renal function was studied. CDP-choline administered ip at a dose of 125 mg/kg body weight prevented the damage induced by Hg2+ administration at a dose of 3 mg/kg body weight. The findings indicate that CDP-choline guards mitochondria against Hg2+ -toxicity by preserving their ability to retain matrix content, such as accumulated Ca2+ . This nucleotide also protected mitochondria from Hg2+ -induced loss of the transmembrane electric gradient and from the generation of hydrogen peroxide and membrane TBARS. In addition, CDP-choline avoided the oxidative damage of mtDNA and inhibited the release of the interleukins IL-1 and IL6, recognized as markers of acute inflammatory reaction. After the administration of Hg2+ and CDP, CDP-choline maintained nearly normal levels of renal function and creatinine clearance, as well as blood urea nitrogen (BUN) and serum creatinine.
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Affiliation(s)
- Mabel Buelna-Chontal
- Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - Martha Franco
- Departamento de Fisopatología Renal, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - Luz Hernández-Esquivel
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - Natalia Pavón
- Departamento de Farmacología, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - José S Rodríguez-Zavala
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - Francisco Correa
- Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - Ricardo Jasso
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - Gregorio Pichardo-Ramos
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - José Santamaría
- Departamento de Fisopatología Renal, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | | | - Virgilia Soto
- Departamento de Patología, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - Jorge L Díaz-Ruíz
- Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
| | - Edmundo Chávez
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, México, D. F. México
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3
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Pavón N, Correa F, Buelna-Chontal M, Hernández-Esquivel L, Chávez E. Ebselen induces mitochondrial permeability transition because of its interaction with adenine nucleotide translocase. Life Sci 2015; 139:108-13. [DOI: 10.1016/j.lfs.2015.08.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 07/30/2015] [Accepted: 08/17/2015] [Indexed: 11/24/2022]
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4
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García-Niño WR, Pedraza-Chaverrí J. Protective effect of curcumin against heavy metals-induced liver damage. Food Chem Toxicol 2014; 69:182-201. [PMID: 24751969 DOI: 10.1016/j.fct.2014.04.016] [Citation(s) in RCA: 222] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 04/05/2014] [Accepted: 04/08/2014] [Indexed: 02/06/2023]
Abstract
Occupational or environmental exposures to heavy metals produce several adverse health effects. The common mechanism determining their toxicity and carcinogenicity is the generation of oxidative stress that leads to hepatic damage. In addition, oxidative stress induced by metal exposure leads to the activation of the nuclear factor (erythroid-derived 2)-like 2/Kelch-like ECH-associated protein 1/antioxidant response elements (Nrf2/Keap1/ARE) pathway. Since antioxidant and chelating agents are generally used for the treatment of heavy metals poisoning, this review is focused on the protective role of curcumin against liver injury induced by heavy metals. Curcumin has shown, in clinical and preclinical studies, numerous biological activities including therapeutic efficacy against various human diseases and anti-hepatotoxic effects against environmental or occupational toxins. Curcumin reduces the hepatotoxicity induced by arsenic, cadmium, chromium, copper, lead and mercury, prevents histological injury, lipid peroxidation and glutathione (GSH) depletion, maintains the liver antioxidant enzyme status and protects against mitochondrial dysfunction. The preventive effect of curcumin on the noxious effects induced by heavy metals has been attributed to its scavenging and chelating properties, and/or to the ability to induce the Nrf2/Keap1/ARE pathway. However, additional research is needed in order to propose curcumin as a potential protective agent against liver damage induced by heavy metals.
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Affiliation(s)
- Wylly Ramsés García-Niño
- Department of Biology, Faculty of Chemistry, National Autonomous University of Mexico (UNAM), University City, 04510 D.F., Mexico
| | - José Pedraza-Chaverrí
- Department of Biology, Faculty of Chemistry, National Autonomous University of Mexico (UNAM), University City, 04510 D.F., Mexico.
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5
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Hernández-Esquivel L, Zazueta C, Buelna-Chontal M, Hernández-Reséndiz S, Pavón N, Chávez E. Protective behavior of tamoxifen against Hg2+-induced toxicity on kidney mitochondria: in vitro and in vivo experiments. J Steroid Biochem Mol Biol 2011; 127:345-50. [PMID: 21821123 DOI: 10.1016/j.jsbmb.2011.07.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 07/12/2011] [Accepted: 07/20/2011] [Indexed: 12/30/2022]
Abstract
Heavy metals are known to induce functional alterations in kidney mitochondria, this damage plays a central role in the mercury-induced acute renal failure. In fact, mercury causes rapid and dramatic changes in the membrane's ionic permeability in such a way that a supra load of mitochondrial Ca(2+) occurs. As a consequence, the phenomenon of permeability transition takes place. In this work we studied in vitro and in vivo the protective effect of the selective estrogen receptor modulator tamoxifen on the deleterious action of mercury-induced nonselective permeability in kidney mitochondria. Added in vitro tamoxifen inhibited membrane nonspecific pore opening, brought about by Hg(2+), as well as the oxidative damage of the enzyme cis-aconitase. In vivo the administration of tamoxifen prevented Hg(2+)-induced poisoning on mitochondrial energy-dependent functions. Permeability transition was analyzed by measuring matrix Ca(2+) retention, mitochondrial swelling, and the build up and maintenance of a transmembrane electric gradient. The pharmacologic action of tamoxifen on mercury poisoning could be ascribed to its cyclosporin-like action.
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Affiliation(s)
- Luz Hernández-Esquivel
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, Tlalpan, DF 014080, Mexico
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6
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Pavón N, Franco M, Correa F, García N, Martínez-Abundis E, Cruz D, Hernández-Esquivel L, Santamaría J, Rodríguez JS, Zazueta C, Chávez E. Octylguanidine ameliorates the damaging effect of mercury on renal functions. J Biochem 2010; 149:211-7. [PMID: 21113053 DOI: 10.1093/jb/mvq137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Mercurials are known to induce morphological and functional modifications in kidney. The protective effect of octylguanidine on the injury induced by Hg(2+) on renal functions was studied. Octylguanidine administered at a dose of 10 mg/kg body weight prevented the damage induced by Hg(2+) administration at a dose of 3 mg/kg body weight. The findings indicate that octylguanidine spared mitochondria from Hg(2+)-poisoning by preserving their ability to retain matrix content, such as accumulated Ca(2+) and pyridine nucleotides. The hydrophobic amine also protected mitochondria from the Hg(2+)-induced loss of the transmembrane potential, and from the oxidative injury of mitochondrial DNA. In addition, octylguanidine maintained renal functions, such as normal values of creatinine clearance and blood urea nitrogen (BUN), and serum creatinine after Hg(2+) administration. It is proposed that octylguanidine protects kidney by inhibiting Hg(2+) uptake to kidney tissue, and in consequence its binding to mitochondrial membrane through a screening phenomenon, in addition to its known action as inhibitor of permeability transition.
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Affiliation(s)
- Natalia Pavón
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, Mexico, DF, Mexico
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7
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García N, Martínez-Abundis E, Pavón N, Chávez E. Sodium inhibits permeability transition by decreasing potassium matrix content in rat kidney mitochondria. Comp Biochem Physiol B Biochem Mol Biol 2006; 144:442-50. [PMID: 16762575 DOI: 10.1016/j.cbpb.2006.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2005] [Revised: 04/18/2006] [Accepted: 04/18/2006] [Indexed: 01/19/2023]
Abstract
Inner membrane mitochondria undergo a permeability increase elicited after the opening of a nonspecific pore due to supraphysiological matrix Ca2+ load, and the presence of an inducer. Multiple inducers have been used to promote the transition in permeability; among them are carboxyatractyloside (CAT) and reactive oxygen-derived species. In contrast, inhibitors such as ADP and cyclosporin A have been commonly used. In this work, we show that the opening or closure of the nonspecific pore depends on the cationic composition of the incubation medium. It was found that when mitochondria were incubated in either 125 mM KCl or 125 mM LiCl, ADP was essential to maintain selective membrane permeability. Interestingly, the nucleotide was not required when the medium contained 125 mM NaCl. Furthermore, it was established that CAT promotes membrane leakage in K(+)- or Li(+)-incubated mitochondria, while it failed to do so in Na(+)-incubated mitochondria. Evidence is also presented on the ability of Na+ to induce resistance in mitochondria against membrane damage by oxidative stress. Mitochondrial Ca2+ discharge, swelling, and transmembrane electric gradient were analyzed to establish permeability transition. It is concluded that the protection provided by Na+ was accomplished by inducing matrix K+ depletion, which, in turn, diminished the free fraction of matrix Ca2+.
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Affiliation(s)
- Noemí García
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, Juan Badiano No. 1, Col. Sección XVI, Tlalpan, DF, México, Mexico
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8
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Burlando B, Bonomo M, Fabbri E, Dondero F, Viarengo A. Hg2+ signaling in trout hepatoma (RTH-149) cells: involvement of Ca2+-induced Ca2+ release. Cell Calcium 2003; 34:285-93. [PMID: 12887976 DOI: 10.1016/s0143-4160(03)00123-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Mercury is a non-essential heavy metal affecting intracellular Ca2+ dynamics. We studied the effects of Hg2+ on [Ca2+]i in trout hepatoma cells (RTH-149). Confocal imaging of fluo-3-loaded cells showed that Hg2+ induced dose-dependent, sustained [Ca2+]i transient, triggered intracellular Ca2+ waves, stimulated Ca2+-ATPase activity, and promoted InsP3 production. The effect of Hg2+ was reduced by the Ca2+ channel blocker verapamil and totally abolished by extracellular GSH, but was almost unaffected by cell loading with the heavy metal chelator TPEN or esterified GSH. In a Ca2+-free medium, Hg2+ induced a smaller [Ca2+]i transient, that was unaffected by TPEN, but was abolished by U73122, a PLC inhibitor, and by cell loading with GDP-betaS, a G protein inhibitor, or heparin, a blocker of intracellular Ca2+ release. Data indicate that Hg2+ induces Ca2+ entry through verapamil-sensitive channels, and intracellular Ca2+ release via a G protein-PLC-InsP3 mechanism. However, in cells loaded with heparin and exposed to Hg2+ in the presence of external Ca2+, the [Ca2+]i rise was maximally reduced, indicating that the global effect of Hg2+ is not a mere sum of Ca2+ entry plus Ca2+ release, but involves an amplification of Ca2+ release operated by Ca2+ entry through a CICR mechanism.
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MESH Headings
- Aniline Compounds/analysis
- Aniline Compounds/pharmacokinetics
- Animals
- Ca(2+) Mg(2+)-ATPase/metabolism
- Calcium/analysis
- Calcium/metabolism
- Calcium Signaling/drug effects
- Calcium Signaling/physiology
- Carcinoma, Hepatocellular/metabolism
- Carcinoma, Hepatocellular/pathology
- Carcinoma, Hepatocellular/physiopathology
- Cell Line, Tumor/drug effects
- Cytosol/chemistry
- Cytosol/drug effects
- Cytosol/metabolism
- Estrenes/pharmacology
- Ethylenediamines/pharmacology
- GTP-Binding Proteins/metabolism
- Glutathione/analogs & derivatives
- Glutathione/pharmacology
- Guanosine Diphosphate/analogs & derivatives
- Guanosine Diphosphate/pharmacology
- Heparin/pharmacology
- Histocytochemistry
- Inositol 1,4,5-Trisphosphate/analysis
- Inositol 1,4,5-Trisphosphate/metabolism
- Kinetics
- Mercury/pharmacology
- Mercury/toxicity
- Microscopy, Confocal
- Microscopy, Fluorescence
- Phospholipases/metabolism
- Pyrrolidinones/pharmacology
- Thionucleotides/pharmacology
- Trout
- Verapamil/pharmacology
- Xanthenes/analysis
- Xanthenes/pharmacokinetics
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Affiliation(s)
- Bruno Burlando
- Dipartimento di Scienze e Tecnologie Avanzate, Università del Piemonte Orientale Amedeo Avogadro, Corso Borsalino 54, 15100 Alessandria, Italy.
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9
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Zazueta C, Sánchez C, García N, Correa F. Possible involvement of the adenine nucleotide translocase in the activation of the permeability transition pore induced by cadmium. Int J Biochem Cell Biol 2000; 32:1093-101. [PMID: 11091142 DOI: 10.1016/s1357-2725(00)00041-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Low levels of cadmium induce a rapid calcium efflux in energized rat kidney mitochondria. This is accompanied by the collapse of the transmembrane gradient in a partial CSA-sensitive fashion. The binding of 109Cd2+ to mitochondria is a saturable function; in the presence of NEM, the binding of 2.5 nmol 109Cd2+/mg of protein suffices to induce the opening of the permeability transition pore. It was found that cadmium bound mainly to proteins of molecular weight between 30 and 50 kDa. In the presence of the monothiol reagent NEM, the label is concentrated in the 30 kDa protein. Following the addition of the reducing agent dithiothreitol, calcium is reaccumulated and the membrane potential restored. This correlates with a significant loss of label in the 30 kDa protein region. The 30 kDa protein was identified as the adenine nucleotide translocase by labelling experiments with eosin 5-maleimide and experiments of reconstitution.
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Affiliation(s)
- C Zazueta
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, Juan Badiano No. 1, Colonia Sección XVI, México, D.F. 014080, Mexico.
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10
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Zazueta C, Reyes-Vivas H, Zafra G, Sánchez CA, Vera G, Chávez E. Mitochondrial permeability transition as induced by cross-linking of the adenine nucleotide translocase. Int J Biochem Cell Biol 1998; 30:517-27. [PMID: 9675885 DOI: 10.1016/s1357-2725(97)00157-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Mitochondrial permeability transition is caused by the opening of a transmembrane pore whose chemical nature has not been well established yet. The present work was aimed to further contribute to the knowledge of the membrane entity comprised in the formation of the non-specific channel. The increased permeability was established by analyzing the inability of rat kidney mitochondria to take up and accumulate Ca2+, as well as their failure to build up a transmembrane potential, after the cross-linking of membrane proteins by copper plus ortho-phenanthroline. To identify the cross-linked proteins, polyacrylamide gel electrophoresis was performed. The results are representative of at least three separate experiments. It is indicated that 30 microM Cu2+ induced the release of 4.3 nmol Ca2+ per mg protein. However, in the presence of 100 microM ortho-phenanthroline only 2 microM Cu2+ was required to attain the total release of the accumulated Ca2+; it should be noted that such a reaction is not inhibited by cyclosporin. The increased permeability corresponds to cross-linking of membrane proteins in which approximately 4 nmol thiol groups per mg protein appear to be involved. Such a linking process is inhibited by carboxyatractyloside. By using the fluorescent probe eosin-5-maleimide the label was found in a cross-linking 60 kDa dimer of two 30 kDa monomers. From the data presented it is concluded that copper-o-phenanthroline induces the intermolecular cross-linking of the adenine nucleotide translocase which in turn is converted to non-specific pore.
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Affiliation(s)
- C Zazueta
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Mexico, D.F., Mexico
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11
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Chávez E, Moreno-Sánchez R, Zazueta C, Rodríguez JS, Bravo C, Reyes-Vivas H. On the protection by inorganic phosphate of calcium-induced membrane permeability transition. J Bioenerg Biomembr 1997; 29:571-7. [PMID: 9559858 DOI: 10.1023/a:1022483018482] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The role of inorganic phosphate as inhibitor of mitochondrial membrane permeability transition was studied. It is shown that in mitochondria containing a high phosphate concentration, i.e., 68 nmo/mg, Ca2+ did not activate the pore opening. Conversely, at lower levels of matrix phosphate, i.e., 38 nmol/mg, Ca2+ was able to induce subsequent pore opening. The inhibitory effect of phosphate was apparent in sucrose-based media, but it was not achieved in KCI media. The matrix free Ca2+ concentration and matrix pH were lowered by phosphate, but they were always higher in K+-media. In the absence of ADP, phosphate strengthened the inhibitory effect of cyclosporin A on carboxyatractyloside-induced Ca2+ efflux. Acetate was unable to replace phosphate in the induction of the aforementioned effects. It is concluded that phosphate preserves selective membrane permeability by diminishing the matrix free Ca2+ concentration.
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Affiliation(s)
- E Chávez
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, México, DF, México
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12
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Bravo C, Chávez E, Rodríguez JS, Moreno-Sánchez R. The mitochondrial membrane permeability transition induced by inorganic phosphate or inorganic arsenate. A comparative study. Comp Biochem Physiol B Biochem Mol Biol 1997; 117:93-9. [PMID: 9180017 DOI: 10.1016/s0305-0491(96)00257-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The membrane permeability transition (MPT) induced by Ca2+ and Pi or Asi was studied in rat kidney mitochondria. Membrane potential, Ca2+ transport and swelling were used to monitor the MPT. Asi promoted a faster and more extensive collapse of membrane potential, Ca2+ release and swelling than Pi. The MPT induced by Pi was fully blocked by Mg(2+)+ADP, spermine+ADP, Mg(2+)+ cyclosporin A (CSA), and ADP+CSA. In contrast, the MPT induced by Asi was only prevented, although not completely, by CSA+Mg2+ or ADP+CSA. Asi, but not Pi, was able to cause collapse of membrane potential in the presence of Sr2+. Carboxyatractyloside (CAT) produced collapse of membrane potential at a lower concentration in the presence of Asi+Ca(2+)+ADP than with Pi+Ca(2+)+ADP. The addition of Pi+Ca2+ to [14C]-ADP loaded mitochondria brought about a greater ADP release than Asi+Ca2+. The ADP release was CAT-sensitive with Pi but it was only partially blocked by Asi. The diminution of external pH did not inhibit the MPT induced by Pi or Asi. The results of this study suggest that the adenine nucleotide translocase does not have an essential role in the MPT induced by Asi+Ca2+.
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Affiliation(s)
- C Bravo
- Departamento de Bioquímica, Instituto Nacional de Cardiología, México D.F., Mexico
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13
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Reyes-Vivas H, Lopez-Moreno F, Chávez E. Protective effect of diethyldithiocarbamate on mercury-induced toxicity in kidney mitochondria. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. PART C, PHARMACOLOGY, TOXICOLOGY & ENDOCRINOLOGY 1996; 113:349-52. [PMID: 8697193 DOI: 10.1016/0742-8413(95)02061-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The protective effect of diethyldithiocarbamate on several functions of kidney mitochondria, isolated from rats poisoned with mercury, was analyzed. The drug, administered at a concentration of 10 mg/ kg body weight to rats treated with a sublethal dose of Hg2+, for example, 2 mg/kg body weight, prevented the mercury-induced damage on: a) transmembrane potential, b) ATP synthesis, and c) Ca2+ accumulation. It is demonstrated that such a protective effect of diethyldithiocarbamate is due to its ionophoretic properties on mercury.
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Affiliation(s)
- H Reyes-Vivas
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Ignacio Chávez, México, D.F., México
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14
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Zazueta C, Reyes-Vivas H, Bravo C, Pichardo J, Corona N, Chávez E. Triphenyltin as inductor of mitochondrial membrane permeability transition. J Bioenerg Biomembr 1994; 26:457-62. [PMID: 7844120 DOI: 10.1007/bf00762786] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The effect of triphenyltin on mitochondrial Ca2+ content was studied. It was found that this trialkyltin compound induces an increase in membrane permeability that leads to Ca2+ release, drop of the transmembrane potential, and efflux of matrix proteins. Interestingly, cyclosporin A was unable to inhibit triphenyltin-induced Ca2+ release. Based on these results it is proposed that the hyperpermeable state is produced by modification of 2.25 nmol of membrane thiol groups.
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Affiliation(s)
- C Zazueta
- Departamento de Bioquímica, Instituto Nacional de Cardiologia, Ignacio Chavez, México, D. F., México
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15
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Uribe A, Chávez E, Jiménez M, Zazueta C, Moreno-Sánchez R. Characterization of Ca2+ transport in Euglena gracilis mitochondria. BIOCHIMICA ET BIOPHYSICA ACTA 1994; 1186:107-16. [PMID: 7516710 DOI: 10.1016/0005-2728(94)90141-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The present study was designed to establish the characteristics of the Ca2+ fluxes in isolated mitochondria of the protist Euglena gracilis. Uptake of Ca2+ and Sr2+ was supported by succinate and lactate oxidation. Ca2+ influx was slightly inhibited by 5 microM Ruthenium red and completely blocked by La3+ with a half-maximal inhibition attained at 50 microM. The addition of inorganic phosphate induced a 3-fold stimulation of Ca2+ uptake. Ca2+ uptake was inhibited by Mg2+ only in the absence of phosphate. Ca2+ efflux was induced by Na+, Li+ and K+ through a diltiazem-insensitive reaction. Ca2+ release, collapse of membrane potential and swelling were induced by Hg2+ and Cd2+ but not by carboxyatractyloside; cyclosporin A did not prevent the Ca2+ release induced by the heavy metal ions. Ca2+ uptake was achieved in the presence of 3 microM antimycin or 0.1 mM cyanide; this finding indicates that the alternative respiratory chain present in Euglena mitochondria can support this energy-dependent reaction. The data obtained suggest similar pathways, but different regulatory mechanisms, for Ca2+ transport between protist and mammalian mitochondria.
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Affiliation(s)
- A Uribe
- Departamento de Bioquímica, Instituto Nacional de Cardiología, México D.F., Mexico
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Chávez R, Corona N, García C, Chávez E. The effect of cyclosporin A on Hg(2+)-poisoning mitochondria. In vivo and in vitro studies. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. PHARMACOLOGY, TOXICOLOGY AND ENDOCRINOLOGY 1994; 107:429-34. [PMID: 8061950 DOI: 10.1016/1367-8280(94)90072-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The protective effect of cyclosporin A on the damage induced by Hg2+ in kidney mitochondria was studied. Cyclosporin, added in vitro at a concentration of 0.5 microM, reversed the deleterious effects of Hg2+ on transmembrane potential and Ca2+ accumulation. However, when injected in rats, together with Hg2+, cyclosporin failed to protect against Hg2+ poisoning. Due to the low activity of cyclophilin found in kidney mitchondria, it is proposed that the protection of cyclosporin in vitro must be exerted through an independent mechanism different from its binding to cyclophilin.
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Affiliation(s)
- R Chávez
- Departamento de Bioquímica, Instituto Nacional de Cardiología, México, D.F., México
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17
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Chávez E, Zazueta C, Reyes-Vivas H, Pichardo J, Corona N, Uribe A, Chávez R. Fluorescamine-induced membrane permeability in mitochondria. THE INTERNATIONAL JOURNAL OF BIOCHEMISTRY 1992; 24:1779-84. [PMID: 1451913 DOI: 10.1016/0020-711x(92)90128-n] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
1. Addition of fluorescamine (75 microM) to mitochondria induced an increase in membrane permeability. 2. The leakiness of the inner mitochondrial membrane is characterized by extensive release of accumulated Ca2+, collapse of the transmembrane potential, mitochondrial swelling and efflux of matrix proteins, among them, malate dehydrogenase. 3. These effects were diminished by supplementing the media with 1 mM phosphate, and partially prevented by Mg2+. 4. These results indicate that the primary amino groups of membrane components contribute, partially, to the maintenance of the permeability barrier in mitochondria.
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Affiliation(s)
- E Chávez
- Departamento de Bioquímica, Instituto Nacional de Cardiología, México, D.F
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18
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Chávez E, Moreno-Sánchez R, Zazueta C, Reyes-Vivas H, Arteaga D. Intramitochondrial K+ as activator of carboxyatractyloside-induced Ca2+ release. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1070:461-6. [PMID: 1764458 DOI: 10.1016/0005-2736(91)90087-o] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The role of intramitochondrial K+ content on the increase in membrane permeability to Ca2+, as induced by carboxyatractyloside was studied. In mitochondria containing a high K+ concentration (83 nmol/mg), carboxyatractyloside induced a fast and extensive mitochondrial Ca2+ release, membrane de-energization, and swelling. Conversely, in K(+)-depleted mitochondria (11 nmol/mg), carboxyatractyloside was ineffective. The addition of 40 mM K+ to K(+)-depleted mitochondria restored the capability of atractyloside to induce an increase in membrane permeability to Ca2+ release. The determination of matrix free Ca2+ concentration showed that, at an external free-Ca2+ concentration of 0.8 microM, control mitochondria contained 3.9 microM of free Ca2+ whereas K(+)-depleted mitochondria contained 0.9 microM free Ca2+. It is proposed that intramitochondrial K+ affects the matrix free Ca2+ concentration required to induce a state of high membrane permeability.
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Affiliation(s)
- E Chávez
- Departamento de Bioquímica, Ignacio Chávez, México, D.F
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Muto H, Shinada M, Tokuta K, Takizawa Y. Rapid changes in concentrations of essential elements in organs of rats exposed to methylmercury chloride and mercuric chloride as shown by simultaneous multielemental analysis. BRITISH JOURNAL OF INDUSTRIAL MEDICINE 1991; 48:382-388. [PMID: 2064976 PMCID: PMC1035382 DOI: 10.1136/oem.48.6.382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
An in vivo study of rats given a dominant lethal dose of methylmercury chloride (MMC) or mercuric chloride (HgCl2) was conducted to elucidate the rapid biotransformation of essential elements. The elements were measured by inductively coupled plasma atomic emission spectrometry. For the rat brain Zn concentrations were higher in the MMC group than in the HgCl2 and control groups. The highest Cu concentration was found in HgCl2 dosed rat liver. For the rat kidney the highest Zn concentration was seen in the MMC group. From principal component analysis on the time dependent behaviour of each element in rat organs, characteristics specific to Cu in the liver and kidney and Mn in the brain were found after exposure to HgCl2 and Ca and Zn in the brain after exposure to MMC.
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Affiliation(s)
- H Muto
- Environmental Research Center, Akita University, Japan
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20
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Moreno-Sánchez R, Bravo C, Gutiérrez J, Newman AH, Chiang PK. Release of Ca2+ from heart and kidney mitochondria by peripheral-type benzodiazepine receptor ligands. THE INTERNATIONAL JOURNAL OF BIOCHEMISTRY 1991; 23:207-13. [PMID: 1847885 DOI: 10.1016/0020-711x(91)90191-o] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
1. The effect of the benzodiazepines Ro5-4864, AHN 086 and clonazepam on the release of Ca2+ from rat heart and kidney mitochondria was studied. 2. The peripheral-type benzodiazepines Ro5-4864 and AHN 086 induced Ca2+ release which was blocked by Mg2+ whereas the central-type benzodiazepine clonazepam was ineffective. 3. An associated collapse of membrane potential and swelling were also induced by AHN 086 in the presence of Ca2+. 4. However, no oxidation of pyridine nucleotides or increased rate or respiration were observed. 5. Release of Sr2+ was induced by AHN 086 in the absence of inorganic phosphate but not in its presence. 6. These data are discussed in the context of the current hypotheses on the mechanism of mitochondrial Ca2+ release.
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Affiliation(s)
- R Moreno-Sánchez
- Departamento de Bioquímica, Instituto Nacional de Cardiología, México, D.F
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21
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Dierks T, Salentin A, Heberger C, Krämer R. The mitochondrial aspartate/glutamate and ADP/ATP carrier switch from obligate counterexchange to unidirectional transport after modification by SH-reagents. BIOCHIMICA ET BIOPHYSICA ACTA 1990; 1028:268-80. [PMID: 1977471 DOI: 10.1016/0005-2736(90)90176-o] [Citation(s) in RCA: 111] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The influence of various SH-reagents on the aspartate/glutamate carrier was investigated in the reconstituted system. When liposomes carrying partially purified carrier protein were treated with 5,5'-dithiobis(2-nitrobenzoic acid) or N-ethylmaleimide, antiport activity was strongly reduced. Several mercury compounds exerted a dual effect. They completely blocked the antiport and, in addition, induced an efflux pathway for internal aspartate. The maximum rate of this unidirectional flux was comparable to the original antiport activity. Induction of efflux always was coupled to inhibition of antiport. Efflux was neither due to unspecific leakage of proteoliposomes nor to a possible contamination by porin, but depended on active carrier protein, as elucidated by the sensitivity to proteinases and protein-modifying reagents. Besides efflux of aspartate, HgCl2 and mersalyl also induced a slow efflux of ATP from liposomes carrying coreconstituted aspartate/glutamate and ADP/ATP carrier. The two efflux activities could be discriminated taking advantage of the differential effectiveness of several inhibitors and proteinases. Although basic carrier properties were changed by the applied mercurials (Dierks, T., Salentin, A. and Krämer, R. (1990) Biochim. Biophys. Acta 1028, 281), aspartate and ATP efflux could clearly be correlated with the aspartate/glutamate and the ADP/ATP carrier, respectively. When purifying these two translocators the respective efflux activity copurified with the antiporter, thus elucidating that the two different transport functions are mediated by the same protein. These results argue for a participation of the aspartate/glutamate and the ADP/ATP carrier in the generally observed increase of mitochondrial permeability after treatment with SH-reagents.
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Affiliation(s)
- T Dierks
- Institut für Biotechnologie, Forschungszentrum Jülich, F.R.G
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Chávez E, Zazueta C, Díaz E. Dicyclohexylcarbodiimide as inducer of mitochondrial Ca2+ release. J Bioenerg Biomembr 1990; 22:679-89. [PMID: 2249979 DOI: 10.1007/bf00809071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The effect of the alkylating reagent dicyclohexylcarbodiimide (DCCD) on mitochondrial Ca2+ content was studied. The results obtained indicate that DCCD at a concentration of 100 microM induces mitochondrial Ca2+ efflux. This reaction is accompanied by an increasing energy drain on the system, stimulation of oxygen consumption, and mitochondrial swelling. These DCCD effects can be partially suppressed by supplementing the incubation medium with 1 mM phosphate. By electrophoretic analysis on polyacrylamide-sodium dodecyl sulfate, it was found that DCCD binds to a membrane component with an Mr of 20 to 29 kDa.
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Affiliation(s)
- E Chávez
- Departamento de Bioquímica, Instituto Nacional de Cardiología, D. F., Mexico
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