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Ali Akbari Ghavimi S, Faulkner TJ, Tata RR, Hemmerla AJ, Huddleston SE, Rezaei F, Lungren ES, Zhang R, Bumann EE, Ulery BD. Hydrogen Sulfide Delivery to Enhance Bone Tissue Engineering Cell Survival. Pharmaceuticals (Basel) 2024; 17:585. [PMID: 38794155 PMCID: PMC11124412 DOI: 10.3390/ph17050585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 03/29/2024] [Accepted: 04/10/2024] [Indexed: 05/26/2024] Open
Abstract
Though crucial for natural bone healing, local calcium ion (Ca2+) and phosphate ion (Pi) concentrations can exceed the cytotoxic limit leading to mitochondrial overload, oxidative stress, and cell death. For bone tissue engineering applications, H2S can be employed as a cytoprotective molecule to enhance mesenchymal stem cell (MSC) tolerance to cytotoxic Ca2+/Pi concentrations. Varied concentrations of sodium hydrogen sulfide (NaSH), a fast-releasing H2S donor, were applied to assess the influence of H2S on MSC proliferation. The results suggested a toxicity limit of 4 mM for NaSH and that 1 mM of NaSH could improve cell proliferation and differentiation in the presence of cytotoxic levels of Ca2+ (32 mM) and/or Pi (16 mM). To controllably deliver H2S over time, a novel donor molecule (thioglutamic acid-GluSH) was synthesized and evaluated for its H2S release profile. Excitingly, GluSH successfully maintained cytoprotective level of H2S over 7 days. Furthermore, MSCs exposed to cytotoxic Ca2+/Pi concentrations in the presence of GluSH were able to thrive and differentiate into osteoblasts. These findings suggest that the incorporation of a sustained H2S donor such as GluSH into CaP-based bone graft substitutes can facilitate considerable cytoprotection, making it an attractive option for complex bone regenerative engineering applications.
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Affiliation(s)
- Soheila Ali Akbari Ghavimi
- Department of Chemical and Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA; (S.A.A.G.); (R.R.T.); (S.E.H.)
| | - Trent J. Faulkner
- Department of Chemical and Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA; (S.A.A.G.); (R.R.T.); (S.E.H.)
| | - Rama Rao Tata
- Department of Chemical and Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA; (S.A.A.G.); (R.R.T.); (S.E.H.)
| | - August J. Hemmerla
- Department of Chemical and Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA; (S.A.A.G.); (R.R.T.); (S.E.H.)
| | - Samantha E. Huddleston
- Department of Chemical and Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA; (S.A.A.G.); (R.R.T.); (S.E.H.)
| | - Farnoushsadat Rezaei
- Department of Chemical and Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA; (S.A.A.G.); (R.R.T.); (S.E.H.)
| | - Ethan S. Lungren
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA
| | - Rui Zhang
- Department of Chemical and Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA; (S.A.A.G.); (R.R.T.); (S.E.H.)
| | - Erin E. Bumann
- Department of Oral and Craniofacial Sciences, University of Missouri, Kansas City, MO 64110, USA;
| | - Bret D. Ulery
- Department of Chemical and Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA; (S.A.A.G.); (R.R.T.); (S.E.H.)
- NextGen Precision Health Institute, University of Missouri, Columbia, MO 65211, USA
- Materials Science & Engineering Institute, University of Missouri, Columbia, MO 65211, USA
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Ghavimi SAA, Lungren ES, Stromsdorfer JL, Darkow BT, Nguyen JA, Sun Y, Pfieffer FM, Goldstein CL, Wan C, Ulery BD. Effect of Dibasic Calcium Phosphate Incorporation on Cellulose Nanocrystal/Chitosan Hydrogel Properties for the Treatment of Vertebral Compression Fractures. AAPS JOURNAL 2019; 21:41. [DOI: 10.1208/s12248-019-0311-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 02/17/2019] [Indexed: 12/16/2022]
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Ali Akbari Ghavimi S, Allen BN, Stromsdorfer JL, Kramer JS, Li X, Ulery BD. Calcium and phosphate ions as simple signaling molecules with versatile osteoinductivity. ACTA ACUST UNITED AC 2018; 13:055005. [PMID: 29794341 DOI: 10.1088/1748-605x/aac7a5] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Due to the continually increasing clinical need to heal large bone defects, synthetic bone graft substitutes have become ever more necessary with calcium phosphates (CaP) widely used due to their similarity to the mineral component of bone. In this research, different concentrations of calcium ions (Ca2+), phosphate ions (Pi), or their combination were provided to mesenchymal stem cells (MSCs) to evaluate their influence on proliferation and differentiation. The results suggest that 1-16 mM Ca2+ and 1-8 mM Pi is osteoinductive, but not cytotoxic. Furthermore, three distinct calcium phosphates (i.e. monobasic, dibasic, and hydroxyapatite) with different dissolution rates were investigated for their Ca2+ and Pi release. These biomaterials were then adjusted to release ion concentrations within the established therapeutics window for which MSC bioactivity was assessed. These findings suggest that CaP-based biomaterials can be leveraged to achieve Ca2+ and Pi dose-dependent osteoinduction for bone regenerative engineering applications.
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Affiliation(s)
- Soheila Ali Akbari Ghavimi
- Department of Chemical Engineering, University of Missouri, Columbia, MO 65211, United States of America
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Diaz-Juarez J, Suarez J, Cividini F, Scott BT, Diemer T, Dai A, Dillmann WH. Expression of the mitochondrial calcium uniporter in cardiac myocytes improves impaired mitochondrial calcium handling and metabolism in simulated hyperglycemia. Am J Physiol Cell Physiol 2016; 311:C1005-C1013. [PMID: 27681178 DOI: 10.1152/ajpcell.00236.2016] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 09/23/2016] [Indexed: 12/21/2022]
Abstract
Diabetic cardiomyopathy is associated with metabolic changes, including decreased glucose oxidation (Gox) and increased fatty acid oxidation (FAox), which result in cardiac energetic deficiency. Diabetic hyperglycemia is a pathophysiological mechanism that triggers multiple maladaptive phenomena. The mitochondrial Ca2+ uniporter (MCU) is the channel responsible for Ca2+ uptake in mitochondria, and free mitochondrial Ca2+ concentration ([Ca2+]m) regulates mitochondrial metabolism. Experiments with cardiac myocytes (CM) exposed to simulated hyperglycemia revealed reduced [Ca2+]m and MCU protein levels. Therefore, we investigated whether returning [Ca2+]m to normal levels in CM by MCU expression could lead to normalization of Gox and FAox with no detrimental effects. Mouse neonatal CM were exposed for 72 h to normal glucose [5.5 mM glucose + 19.5 mM mannitol (NG)], high glucose [25 mM glucose (HG)], or HG + adenoviral MCU expression. Gox and FAox, [Ca2+]m, MCU levels, pyruvate dehydrogenase (PDH) activity, oxidative stress, mitochondrial membrane potential, and apoptosis were assessed. [Ca2+]m and MCU protein levels were reduced after 72 h of HG. Gox was decreased and FAox was increased in HG, PDH activity was decreased, phosphorylated PDH levels were increased, and mitochondrial membrane potential was reduced. MCU expression returned these parameters toward NG levels. Moreover, increased oxidative stress and apoptosis were reduced in HG by MCU expression. We also observed reduced MCU protein levels and [Ca2+]m in hearts from type 1 diabetic mice. Thus we conclude that HG-induced metabolic alterations can be reversed by restoration of MCU levels, resulting in return of [Ca2+]m to normal levels.
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Affiliation(s)
- Julieta Diaz-Juarez
- Department of Medicine, University of California, San Diego, La Jolla, California; and.,Department of Pharmacology, Instituto Nacional de Cardiología Ignacio Chávez, Tlalpan, México, Mexico
| | - Jorge Suarez
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Federico Cividini
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Brian T Scott
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Tanja Diemer
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Anzhi Dai
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Wolfgang H Dillmann
- Department of Medicine, University of California, San Diego, La Jolla, California; and
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Penquerc’h M, Picot D, Vigneau C. Le magnésium : un super cation méconnu ? Revue générale et enquête auprès des généralistes d’Ille-et-Vilaine. Nephrol Ther 2014; 10:25-34. [DOI: 10.1016/j.nephro.2013.09.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 08/22/2013] [Accepted: 09/10/2013] [Indexed: 10/25/2022]
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Brown AM, Kristal BS, Effron MS, Shestopalov AI, Ullucci PA, Sheu KF, Blass JP, Cooper AJ. Zn2+ inhibits alpha-ketoglutarate-stimulated mitochondrial respiration and the isolated alpha-ketoglutarate dehydrogenase complex. J Biol Chem 2000; 275:13441-7. [PMID: 10788456 DOI: 10.1074/jbc.275.18.13441] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Intracellular free Zn(2+) is elevated in a variety of pathological conditions, including ischemia-reperfusion injury and Alzheimer's disease. Impairment of mitochondrial respiration is also associated with these pathological conditions. To test whether elevated Zn(2+) and impaired respiration might be linked, respiration of isolated rat liver mitochondria was measured after addition of Zn(2+). Zn(2+) inhibition (K(i)(app) = approximately 1 micrometer) was observed for respiration stimulated by alpha-ketoglutarate at concentrations well within the range of intracellular Zn(2+) reported for cultured hepatocytes. The bc(1) complex is inhibited by Zn(2+) (Link, T. A., and von Jagow, G. (1995) J. Biol. Chem. 270, 25001-25006). However, respiration stimulated by succinate (K(i)(app) = approximately 6 micrometer) was less sensitive to Zn(2+), indicating the existence of a mitochondrial target for Zn(2+) upstream from bc(1) complex. Purified pig heart alpha-ketoglutarate dehydrogenase complex was strongly inhibited by Zn(2+) (K(i)(app) = 0.37 +/- 0.05 micrometer). Glutamate dehydrogenase was more resistant (K(i)(app) = 6 micrometer), malate dehydrogenase was unaffected, and succinate dehydrogenase was stimulated by Zn(2+). Zn(2+) inhibition of alpha-ketoglutarate dehydrogenase complex required enzyme cycling and was reversed by EDTA. Reversibility was inversely related to the duration of exposure and the concentration of Zn(2+). Physiological free Zn(2+) may modulate hepatic mitochondrial respiration by reversible inhibition of the alpha-ketoglutarate dehydrogenase complex. In contrast, extreme or chronic elevation of intracellular Zn(2+) could contribute to persistent reductions in mitochondrial respiration that have been observed in Zn(2+)-rich diseased tissues.
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Affiliation(s)
- A M Brown
- Burke Medical Research Institute, White Plains, New York 10605, USA.
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Haas RH, Thompson G, Morris B, Conright K, Andrews T. Pyruvate dehydrogenase activity in osmotically shocked rat brain mitochondria: stimulation by oxaloacetate. J Neurochem 1988; 50:673-80. [PMID: 3339345 DOI: 10.1111/j.1471-4159.1988.tb02966.x] [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: 01/05/2023]
Abstract
Pyruvate dehydrogenase complex activity (PDHC) measured by CO2 release isotopic assay has generally been much lower than activity measured by the spectrophotometric arylamine acetyltransferase assay (ArAT). Decarboxylation of [1-14C]pyruvate was measured in osmotically shocked rat brain cortical mitochondria. Activity is dependent on the concentration of the substrate pyruvate. Activity of 74.6 units +/- 12.3 SD (n = 22) was observed at 4 mM pyruvate (1 unit = 1 nmol pyruvate decarboxylated/min/mg protein). Activity was dependent on added NAD, CoA, and thiamine pyrophosphate, implying increased mitochondrial permeability after osmotic shock. Freeze/thaw with sonication of the mitochondrial preparation reduced PDHC activity to 11.5 units +/- 3.0 SD (n = 4). Oxaloacetate produced a marked stimulation of activity. The optimal assay contained 3 mM oxaloacetate, and without oxaloacetate activity fell to 15.4 units +/- 9.9 SD (n = 8). These studies highlight the importance of optimal substrate concentrations in the CO2 release isotopic PDHC method. Higher PDHC activity is found with intact mitochondria and thus activity values should be interpreted in the light of the presence or absence of intact mitochondria in individual preparations.
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Affiliation(s)
- R H Haas
- Department of Neurosciences, University of California, San Diego, UCSD Medical Center, 92103
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8
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Subcellular calcium and magnesium mobilization in rat liver stimulated in vivo with vasopressin and glucagon. J Biol Chem 1987. [DOI: 10.1016/s0021-9258(18)47773-3] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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9
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The effects of alpha-adrenergic stimulation on the regulation of the pyruvate dehydrogenase complex in the perfused rat liver. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(17)39356-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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10
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Buffington CK, Kitabchi AE. Activation of pyruvate dehydrogenase complex (PDC) of rat heart mitochondria by glyburide. Biochem Biophys Res Commun 1984; 123:202-9. [PMID: 6433915 DOI: 10.1016/0006-291x(84)90399-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The effects of the second generation sulfonylurea, glyburide, on the pyruvate dehydrogenase multienzyme complex (PDC) of rat myocardial tissue were examined using rat ventricular slices and isolated mitochondria. Therapeutic concentrations (10(-7) to 10(-6)M) of glyburide produced a 30% increase in the decarboxylation of [1(-14)C] pyruvate by the PDC of ventricular tissue. Addition of glyburide to intact rat heart mitochondria stimulated activity of the PDC in a time- and concentration-dependent manner. Half-maximal stimulation of the enzyme occurred with 6 X 10(-5)M glyburide and maximal activation of the enzyme was achieved with 1 X 10(-4)M glyburide. At the height of stimulation, PDC activities were 6-fold greater than those observed under control conditions with succinate alone. When mitochondria were disrupted by sonication or freeze-thawing, glyburide produced no stimulation of pyruvate decarboxylation. We conclude that glyburide directly stimulates the decarboxylation of pyruvate by the PDC of the myocardium. Furthermore, the presence of intact mitochondria is necessary for the stimulatory action of glyburide on the PDC.
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Patel TB, DeBuysere MS, Olson MS. The effect of propionate on the regulation of the pyruvate dehydrogenase complex in the rat liver. Arch Biochem Biophys 1983; 220:405-14. [PMID: 6824332 DOI: 10.1016/0003-9861(83)90430-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Propionate inhibited the metabolic flux through the pyruvate dehydrogenase reaction in the perfused rat liver when the perfusate concentration of propionate was below 10 mM and the perfusate pyruvate concentration was held within the physiological range. At higher propionate concentrations (e.g., 20 mM) the inhibition of pyruvate dehydrogenase was alleviated and the activation state of the pyruvate dehydrogenase complex was nearly doubled. In livers perfused with a high pyruvate concentration (e.g., 5 mM), propionate coinfusion at all concentrations inhibited the rate of pyruvate decarboxylation. Additional studies were performed in liver mitochondria maintained in State 3 where the ATP/ADP and the NADH/NAD+ ratios were held constant. Low propionate concentrations (e.g., 0.5 mM) inactivated the mitochondrial pyruvate dehydrogenase complex, whereas propionate levels in excess of 1 mM activated the enzyme complex. CoA distribution analyses of the mitochondrial incubations indicated that the presence of either 0.5 or 10 mM propionate caused a substantial accumulation of propionyl-CoA and methylmalonyl-CoA at the expense of free CoASH. Experiments were performed in which the ratios of various acyl-CoA derivatives to CoASH were varied by sequentially increasing the L-carnitine concentrations in the incubation. An inverse relationship between the propionyl-CoA/CoASH and methylmalonyl-CoA/CoASH ratios and the activity of the pyruvate dehydrogenase complex was observed. Experiments using freeze-thawed liver mitochondrial membranes indicated that propionate protected the pyruvate dehydrogenase complex from ATP-mediated inactivation by the pyruvate dehydrogenase kinase. It is our contention that the inactivation of pyruvate dehydrogenase complex at low propionate levels may be due to an increase in the mitochondrial acyl-CoA/CoASH ratios, whereas the activation of the enzyme complex demonstrated at high propionate levels is due to the inhibition of the pyruvate dehydrogenase kinase in a manner similar to that caused by pyruvate or dichloroacetic acid.
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Patel TB, Olson MS. Evidence for the regulation of the branched chain alpha-keto acid dehydrogenase multienzyme complex by a phosphorylation/dephosphorylation mechanism. Biochemistry 1982; 21:4259-65. [PMID: 6812622 DOI: 10.1021/bi00261a012] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The regulation of the branched chain alpha-keto acid dehydrogenase complex by covalent modification was investigated in rat liver mitochondria. Depletion of intramitochondrial calcium and magnesium caused an inactivation of the branched chain alpha-keto acid dehydrogenase complex. Following inactivation of the branched chain complex, addition of calcium or magnesium ions separately to incubations of mitochondria only partially reactivated the enzyme complex. However, simultaneous addition of calcium and magnesium activated the branched chain enzyme complex rapidly and nearly completely. Mitochondrial incubations were performed in the presence of [32P]phosphate under conditions known to activate or to inactivate the branched chain alpha-keto acid dehydrogenase complex. Evidence demonstrating that [32P]-phosphate was incorporated into two major protein bands separated in sodium dodecyl sulfate-polyacrylamide gels of the mitochondrial incubations is presented. Migration of the labeled mitochondrial protein bands in the gel system corresponded exactly to the migration of the alpha subunit of the purified heart-derived pyruvate dehydrogenase (decarboxylase, E1) and the alpha subunit of the purified kidney-derived branched chain alpha-keto acid dehydrogenase (decarboxylase, E1). Furthermore, when the measured activity of the branched chain complex was minimized, the amount of [32P]phosphate incorporated into the alpha chain of the branched chain enzyme was maximal. Conversely, incubation conditions which activated maximally the enzyme complex minimized the [32P]phosphate incorporation into the alpha subunit of the branched chain dehydrogenase.
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Patel TB, Debuysere MS, Scholz R, Olson MS. The regulation of the pyruvate dehydrogenase complex in the perfused rat liver: a role for the mitochondrial monocarboxylate translocator. Arch Biochem Biophys 1982; 213:573-84. [PMID: 6803675 DOI: 10.1016/0003-9861(82)90586-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Andia-Waltenbaugh AM, Tate CA, Friedmann NK. The effect of glucagon on the kinetics of hepatic mitochondrial calcium uptake. Mol Cell Biochem 1981; 36:177-84. [PMID: 7254203 DOI: 10.1007/bf02357035] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Previous work by this and other laboratories has shown that glucagon administration stimulates calcium uptake by subsequently isolated hepatic mitochondria. This stimulation of hepatic mitochondrial Ca2+ uptake by in vivo administration of glucagon was further characterized in the present report. Maximal stimulation of mitochondrial Ca2+ accumulation was achieved between 6-10 min after the intravenous injection of glucagon into intact rats. Under control conditions, Ca2+ uptake was inhibited by the presence of Mg2+ in the incubation medium. Glucagon treatment, however, appeared to obliterate the observed inhibition by Mg2+ of mitochondrial Ca2+ uptake. Kinetic experiments revealed the usual sigmoidicity associated with initial velocity curves for mitochondrial calcium uptake. Glucagon treatment did not alter this sigmoidal relationship. Glucagon treatment significantly increased the V max for Ca2+ uptake from 292 +/- 22 to 377 +/- 34 nmoles Ca2+/min per mg protein (n = 8) but did not affect the K 0.5, (6.5-8.6 microM). Since the major kinetic change in mitochondrial Ca2+ uptake evoked by glucagon is an increase in V max, the enhancement mechanism is likely to be an increase either in the number of active transport sites available to Ca2+ or in the rate of Ca2+ carrier movement across the mitochondrial membranes.
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Waymack P, DeBuysere M, Olson M. Studies on the activation and inactivation of the branched chain alpha-keto acid dehydrogenase in the perfused rat heart. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(18)43460-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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16
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Studies of the effects of beta-adrenergic agonists on the regulation of pyruvate dehydrogenase in the perfused rat heart. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(19)43871-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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17
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Buffington C, DeBuysere M, Olson M. Studies on the regulation of the branched chain alpha-keto acid dehydrogenase in the perfused rat heart. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(19)86730-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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18
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Dennis S, Padmas A, DeBuysere M, Olson M. Studies on the regulation of pyruvate dehydrogenase in the isolated perfused rat heart. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(17)34195-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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19
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Luthra R, Olson MS. The effects of chlorotetracycline on calcium movements in isolated rat liver mitochondria. Arch Biochem Biophys 1978; 191:494-502. [PMID: 742885 DOI: 10.1016/0003-9861(78)90388-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Scholz R, Olson MS, Schwab AJ, Schwabe U, Noell C, Braun W. The effect of fatty acids on the regulation of pyruvate dehydrogenase in perfused rat liver. EUROPEAN JOURNAL OF BIOCHEMISTRY 1978; 86:519-30. [PMID: 658055 DOI: 10.1111/j.1432-1033.1978.tb12335.x] [Citation(s) in RCA: 83] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The effect of fatty acids on the rate of pyruvate decarboxylation was studied in perfused livers from fed rats. The production of 14CO2 from infused [1-14C]pyruvate was employed as a monitor of the flux through the pyruvate dehydrogenase reaction. A correction for other decarboxylation reactions was made using kinetic analyses. Fatty acid (octanoate or oleate) infusion caused a stimulation of pyruvate decarboxylation at pyruvate concentrations in the perfusate below 1 mM (up to 3-fold at 0.05 mM pyruvate) but decreased the rate to one-third of control rates at pyruvate concentrations near 5 mM. These effects were half-maximal at fatty acid concentrations below 0.1 mM. Infusion of 3-hydroxybutyrate also caused a marked stimulation of pyruvate decarboxylation at low pyruvate concentrations. The data suggest that the mechanism by which fatty acids stimulate the flux through the pyruvate dehydrogenase reaction in perfused liver at low (limiting) pyruvate concentrations involves an acceleration of pyruvate transport into the mitochondrial compartment due to an exchange with acetoacetate. Furthermore, it is proposed that a relationship exists between ketogenesis and the regulation of pyruvate oxidation at pyruvate concentrations approximating conditions in vivo.
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Olson MS, Dennis SC, Routh CA, Debuysere MS. The regulation of pyruvate dehydrogenase by fatty acids in isolated rabbit heart mitochondria. Arch Biochem Biophys 1978; 187:121-31. [PMID: 207223 DOI: 10.1016/0003-9861(78)90014-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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22
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Leiter A, Weinberg M, Isohashi F, Utter M. Relationshiop between phosphorylation and activity of pyruvate dehydrogenase in rat liver mitochondria and the absence of such a relationship for pyruvate carboxylase. J Biol Chem 1978. [DOI: 10.1016/s0021-9258(17)40879-9] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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23
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Dennis S, DeBuysere M, Scholz R, Olson M. Studies on the relationship between ketogenesis and pyruvate oxidation in isolated rat liver mitochondria. J Biol Chem 1978. [DOI: 10.1016/s0021-9258(17)38063-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Cate R, Roche T. A unifying mechanism for stimulation of mammalian pyruvate dehydrogenase(a) kinase by reduced nicotinamide adenine dinucleotide, dihydrolipoamide, acetyl coenzyme A, or pyruvate. J Biol Chem 1978. [DOI: 10.1016/s0021-9258(17)38237-6] [Citation(s) in RCA: 73] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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25
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Regulation by calcium ions of pyruvate carboxylation, pyruvate transport, and adenine nucleotide transport in isolated rat liver mitochondria. J Biol Chem 1977. [DOI: 10.1016/s0021-9258(19)63358-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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26
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Blair PV. Induction of mitochondrial contraction and concomitant inhibition of succinate oxidation by magnesium ions. Arch Biochem Biophys 1977; 181:550-68. [PMID: 409347 DOI: 10.1016/0003-9861(77)90262-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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27
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Studies on inactivation of pyruvate dehydrogenase by palmitoylcarnitine oxidation in isolated rat heart mitochondria. J Biol Chem 1977. [DOI: 10.1016/s0021-9258(17)40585-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Schaffer WT, Olson MS. Chlorotetracycline-associated fluorescence changes during calcium uptake and release by rat brain synaptosomes. J Neurochem 1976; 27:1319-25. [PMID: 1003206 DOI: 10.1111/j.1471-4159.1976.tb02610.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Luthra R, Olson MS. Studies of mitochondrial calcium movements using chlorotetracycline. BIOCHIMICA ET BIOPHYSICA ACTA 1976; 440:744-58. [PMID: 822874 DOI: 10.1016/0005-2728(76)90056-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
1. The association of calcium with isolated rat liver mitochondrial membranes under various metabolic conditions was monitored using the fluorescent chelate probe, chlorotetracycline. Chlorotetracycline fluorescence increased markedly during energized calcium uptake in the absence of a permeant anion. Uncoupler and a respiratory chain inhibitor caused a rapid decrease in chlorotetracycline fluorescence when added either before or after calcium. During calcium uptake experiments concentrations of calcium exceeding 100 muM caused a transient fluorescence increase followed by an extensive decrease in fluorescence. 2. Changes in the chlorotetracycline-associated fluorescence of the mitochondrial suspensions were correlated with the uptake of exogenous 45Ca. A positive correlation was observed between fluorescence and energized 45Ca uptake in the absence of permeant anions. Addition of the permeant anion, phosphate, caused an extensive decrease in chloretetracycline fluorescence but an enhanced uptake of exogenous 45Ca. 3. The interaction of endogenous mitochondrial calcium with the fluorescent chelate probe was studied under a number of experimental conditions using mitochondria labeled during preparation with 45Ca. Endogenous 45Ca was lost rapidly from the mitochondria upon treatment with uncoupler, antimycin A, and A23187. Potassium phosphate and EGTA had no effect on the endogenous calcium as measured by either the 45Ca content of the mitochondria or the fluorescence of the probe. 4. Mitochondria treated with antimycin A lost most of their endogenous 45Ca within 3 min; subsequent energization of the mitochondria resulted in a partial uptake of the released 45Ca but caused nearly a complete return of the chlorotetracycline fluorescence to the original level. Addition of phosphate did not change the fluorescence level but resulted in an almost complete accumulation of the 45Ca previously released. 5. Following this energized uptake of 45Ca, EGTA, p-trifluoromethoxyphenyl hydrazone of carbonyl cyanide, A23187 and calcium chloride all caused a nearly complete loss of the 45Ca from the mitochondria and, with the exception of calcium chloride, caused an extensive decrease in the fluorescence level. Hence, the apparent location and/or properties of the endogenous calcium in this rat liver mitochondrial system were altered significantly by manipulation of the energetic state of the mitochondrial membrane.
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Batenburg JJ, Olson MS. Regulation of pyruvate dehydrogenase by fatty acid in isolated rat liver mitochondria. J Biol Chem 1976. [DOI: 10.1016/s0021-9258(17)33748-1] [Citation(s) in RCA: 95] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Brierley GP. The uptake and extrusion of monovalent cations by isolated heart mitochondria. Mol Cell Biochem 1976; 10:41-63. [PMID: 2858 DOI: 10.1007/bf01731680] [Citation(s) in RCA: 117] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The factors involved in the movement of monovalent cations across the inner membrane of the isolate heart mitochondrion are reviewed. The evidence suggests that the energy-dependent uptake of K+ and Na+ which results in swelling of the matrix is an electrophoretic response to a negative internal potential. There are no clear cut indications that this electrophoretic cation movement is carrier-mediated and possible modes of entry which do not require a carrier are examined. The evidence also suggests that the monovalent cation for proton exchanger (Na+ greater than K+) present in the membrane may participate in the energy-dependent extrusion of accumulated ions. The two processes, electrophoreti c cation uptake (swelling) and exchange-dependent cation extrusion (contraction) may represent a means of controlling the volume of the mitochondrion within the functioning cell. A number of indications point to the possibility that the volume control process may be mediated by the divalent cations Ca+2 and Mg+2. Studies with mercurial reagents also implicate certain membrane thiol groups in the postulated volume control process.
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Schuster SM, Olson MS, Routh CA. Studies on the regulation of pyruvate dehydrogenase in isolated beef heart mitochondria. Arch Biochem Biophys 1975; 171:745-52. [PMID: 1200648 DOI: 10.1016/0003-9861(75)90088-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Binet A, Volfin P. Regulation by Mg2+ and Ca2+ of mitochondrial membrane integrity: study of the effects of a cytosolic molecule and Ca2+ antagonists. Arch Biochem Biophys 1975; 170:576-86. [PMID: 1190780 DOI: 10.1016/0003-9861(75)90153-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Batenburg JJ, Olson MS. The inactivation of pyruvate dehydrogenase by fatty acid in isolated rat liver mitochondria. Biochem Biophys Res Commun 1975; 66:533-40. [PMID: 170922 DOI: 10.1016/0006-291x(75)90543-4] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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