426
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Magyar K, Heindorf J, Kolb J, Richter C. [The male breast tumor in a district city--a social, public health and epidemiological report]. ZEITSCHRIFT FUR DIE GESAMTE HYGIENE UND IHRE GRENZGEBIETE 1982; 28:754-6. [PMID: 6983785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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427
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Stocker R, Winterhalter KH, Richter C. Increased fluorescence polarization of 1,6-diphenyl-1,3,5-hexatriene in the phorbol myristate acetate-stimulated plasma membrane of human neutrophils. FEBS Lett 1982; 144:199-203. [PMID: 7117537 DOI: 10.1016/0014-5793(82)80637-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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428
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Magyar K, Heindorf J, Kolb J, Richter C. [Chronic lymphatic leukemia]. ZEITSCHRIFT FUR DIE GESAMTE HYGIENE UND IHRE GRENZGEBIETE 1982; 28:559-61. [PMID: 7136068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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429
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Kawato S, Gut J, Cherry RJ, Winterhalter KH, Richter C. Rotation of cytochrome P-450. I. Investigations of protein-protein interactions of cytochrome P-450 in phospholipid vesicles and liver microsomes. J Biol Chem 1982; 257:7023-9. [PMID: 7085615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Rotation of cytochrome P-450 was examined in both liver microsomes and reconstituted and phospholipid vesicles. Purified cytochrome P-450 was incorporated into lipid vesicles composed of phosphatidylcholine-phosphatidylethanolamine-Phosphatidylserne. Rotational diffusion was measured by detecting the decay of absorption anisotropy, r(t), after photolysis of the heme. CO complex by a vertically polarized laser flash. No contribution of vesicle tumbling to r(t) was observed over the experimental time range of 0-500 mus for samples in 60% sucrose. Analysis of r(t) was based on a "rotation-about-membrane normal" model. The measurements were used to investigate intermolecular interactions of cytochrome P-450. In vesicles of a high lipid to protein ratio (=30 by weight), the residual time-independent normalized anisotropy, r (infinity)/r (0), reached a limiting low value, implying that all cytochrome P-450 was rotating. The mean rotational relaxation time, phi 1, was about 95 mus. In contrast, about 35% of cytochrome P-450 was immobilized in vesicles of a low lipid to protein ratio (=1), with phi 1 of about 95 mus for the mobile fraction. The immobile fraction is presumably due to self-aggregation of cytochrome P-450. In rat liver microsomes, 0-50% of cytochrome P-450 was mobile with phi 1 of about 120 mus at 20 degrees C, and the rest was immobile. A significant temperature dependence of r(t) was observed in microsomes. All cytochrome P-450 was immobile below 7 degrees C, and about 50% of the enzyme was mobile at 37 degrees C with phi 1 approximately 60 mus. From the limiting value of r(infinity)/r(0) congruent to 0.12, the tilt angle of the heme plane of cytochrome p-450 from the membrane plane was calculated to be about 40 degrees.
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430
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Gut J, Richter C, Cherry RJ, Winterhalter KH, Kawato S. Rotation of cytochrome P-450. II. Specific interactions of cytochrome P-450 with NADPH-cytochrome P-450 reductase in phospholipid vesicles. J Biol Chem 1982; 257:7030-6. [PMID: 6806262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Purified rat liver microsomal cytochrome P-450 and NADPH-cytochrome P-450 reductase were co-reconstituted in phosphatidylcholine-phosphatidylethanolamine-phosphatidylserine vesicles using a cholate dialysis technique. The co-reconstitution of the enzymes was demonstrated in proteoliposomes fractionated by centrifugation in a glycerol gradient. The proteoliposomes catalyzed the N-demethylation of a variety of substrates. Rotational diffusion of cytochrome P-450 was measured by detecting the decay of absorption anisotropy r(t), after photolysis of the heme.CO complex by a vertically polarized laser flash. The rotational mobility of cytochrome P-450, when reconstituted alone, was found to be dependent on the lipid to protein ratio by weight (L/P450) (Kawato, S., Gut, J., Cherry, R. J., Winterhalter, K. H., and Richter, C. (1982) J. Biol. Chem. 257, 7023-7029). About 35% of cytochrome P-450 was immobilized and the rest was rotating with a mean rotational relaxation time phi 1 of about 95 mus in L/P450 = 1 vesicle. In L/P450 = 10 vesicles, about 10% of P-450 was immobile and the rest was rotating with phi 1 congruent to 55 mus. Co-reconstitution of equimolar amounts of NADPH-cytochrome P-450 reductase into the above vesicles results in completely mobile cytochrome P-450 with a phi 1 congruent to 40 mus. Only a small decrease in the immobile fraction of cytochrome P-450 is observed when the molar ratio of cytochrome P-450 to the reductase is 5. The results suggest the formation of a monomolecular 1:1 complex between cytochrome P-450 and NADPH-cytochrome P-450 reductase in the liposomes.
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431
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Eichenberger K, Böhni P, Winterhalter KH, Kawato S, Richter C. Microsomal lipid peroxidation causes an increase in the order of the membrane lipid domain. FEBS Lett 1982; 142:59-62. [PMID: 7106287 DOI: 10.1016/0014-5793(82)80219-6] [Citation(s) in RCA: 120] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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432
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Schulze K, Richter F, Richter C, Mai W, Mrozek E. Eine neue synthese 2-substituierter 6H-1,3-thiazine. Tetrahedron Lett 1982. [DOI: 10.1016/s0040-4039(00)85885-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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433
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Schneider HG, Friedländer B, Richter C, Unger E, Ziesenitz S, Bendrien S. [Experience with plaque-disclosing agents]. STOMATOLOGIE DER DDR 1981; 31:904-9. [PMID: 6950583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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434
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Hofstetter W, Mühlebach T, Lötscher HR, Winterhalter KH, Richter C. ATP prevents both hydroperoxide-induced hydrolysis of pyridine nucleotides and release of calcium in rat liver mitochondria. EUROPEAN JOURNAL OF BIOCHEMISTRY 1981; 117:361-7. [PMID: 6268408 DOI: 10.1111/j.1432-1033.1981.tb06346.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The mechanism of the hydroperoxide-induced release of calcium from rat liver mitochondria was investigated. In calcium-loaded mitochondria both the hydroperoxide-induced hydrolysis of pyridine nucleotides and the release of calcium is inhibited by intramitochondrial ATP. In submitochondrial particles, in the absence of ATP a hydrolytic product of NAD+, probably ADP-ribose, binds covalently to a protein of the inner mitochondrial membrane. It is proposed that a compound deriving from NAD(P)+ is an important factor in the calcium release mechanism in rat liver mitochondria.
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435
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Lötscher HR, Winterhalter KH, Carafoli E, Richter C. Hydroperoxide-induced loss of pyridine nucleotides and release of calcium from rat liver mitochondria. J Biol Chem 1980; 255:9325-30. [PMID: 6773965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
It has been previously reported (Lötscher, H. R., Winterhalter, K. H., Carafoli, E., and Richter, C. (1979) Proc. Natl. Acad. Sci. U. S. A. 76, 4340-4344) that in Ca2+-loaded mitochondria hydroperoxides induce a release of Ca2+ from mitochondria and an irreversible oxidation of mitochondrial pyridine nucleotides. Here we show that in the presence of Ca2+ oxidized mitochondrial pyridine nucleotides are hydrolyzed inside mitochondria and that nicotinamide is released from mitochondria. The extent of the hydrolysis of NAD(P)+ is dependent on the amount of both hydroperoxide and Ca2+. The hydrolysis is reversible in the presence of added nicotinamide. The release of Ca2+ from mitochondria is electroneutral, and is directly or indirectly dependent on oxidized mitochondrial pyridine nucleotides. By contrast, the uptake of Ca2+ most probably does not require the present of reduced pyridine nucleotides. Control experiments show that even under the most drastic conditions employed in this study (100 nmol of Ca2+ and 85 nmol of t-butylhydroperoxide/mg of protein) mitochondria retain a considerable degree of functional integrity.
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436
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Lötscher H, Winterhalter K, Carafoli E, Richter C. Hydroperoxide-induced loss of pyridine nucleotides and release of calcium from rat liver mitochondria. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(19)70565-1] [Citation(s) in RCA: 131] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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437
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Lötscher HR, Winterhalter KH, Carafoli E, Richter C. The energy-state of mitochondria during the transport of Ca2+. EUROPEAN JOURNAL OF BIOCHEMISTRY 1980; 110:211-6. [PMID: 7439160 DOI: 10.1111/j.1432-1033.1980.tb04857.x] [Citation(s) in RCA: 102] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The fluctuations of the membrane potential during mitochondrial Ca2+ transport have been monitored with an electrode sensitive to tetraphenylphosphonium. The following conclusions have been reached. 1. The membrane becomes depolarized during the influx of Ca2+. When the bulk of the Ca2+ pulse has been taken up, it repolarizes, but not completely. 2. If all of the accumulated Ca2+ is released from mitochondria and cycling is inhibited, the membrane repolarizes completely. 3. The accumulation of Ca2+ alone does not induce mitochondrial damage. In the presence of inorganic phosphate, the uptake of Ca2+ may lead to complete and irreversible depolarization, depending on the amount of Ca2+ and phosphate accumulated. The irreversible damage observed in the presence of phosphate is prevented by Mg2+.
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438
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Magyar K, Heindorf J, Richter C. [Polycythemia vera, a report on 24 cases]. ZEITSCHRIFT FUR DIE GESAMTE HYGIENE UND IHRE GRENZGEBIETE 1980; 26:271-3. [PMID: 7445588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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439
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Richter C, Pripfl T, Winterhalter KH. Tyrosine . copper(II) inhibits lipid peroxidation in rat liver microsomes. FEBS Lett 1980; 111:95-8. [PMID: 6766880 DOI: 10.1016/0014-5793(80)80769-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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440
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Magyar K, Heindorf J, Richter C. [Mycosis fungoides--epidemiological note]. ZEITSCHRIFT FUR DIE GESAMTE HYGIENE UND IHRE GRENZGEBIETE 1980; 26:124-125. [PMID: 7395281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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441
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Lötscher HR, Winterhalter KH, Carafoli E, Richter C. Hydroperoxides can modulate the redox state of pyridine nucleotides and the calcium balance in rat liver mitochondria. Proc Natl Acad Sci U S A 1979; 76:4340-4. [PMID: 41241 PMCID: PMC411570 DOI: 10.1073/pnas.76.9.4340] [Citation(s) in RCA: 142] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
When rats are fed a selenium-deficient diet, the glutathione peroxidase activity in liver mitochondria decreases within 5 weeks to 0-6% of that of control animals fed on a diet supplemented with 0.5 ppm of selenium as sodium selenite. Analysis of the temperature dependence of energy-linked Ca(2+) uptake by means of Arrhenius plots reveals two breaks (at around 11 degrees C and 24 degrees C) in mitochondria isolated from selenium-supplemented animals, whereas in selenium-deficient rats the break at 11 degrees C is absent. Ca(2+)-loaded mitochondria of selenium-supplemented rats-i.e., with active glutathione peroxidase in the matrix-lose Ca(2+) rapidly, with a concomitant oxidation of endogenous NAD(P)H, when exposed to t-butyl hydroperoxide or H(2)O(2). In contrast, in selenium deficiency, t-butyl hydroperoxide and H(2)O(2) induce neither a release of Ca(2+) nor an oxidation of NAD(P)H. The peroxide-induced oxidation of NAD(P)H is reversible in the presence of succinate when no Ca(2+) has been taken up. When Ca(2+) has previously been accumulated, however, the oxidation of NAD(P)H is irreversible. Enzymatic analysis of mitochondrial pyridine nucleotides reveals that the peroxide-induced oxidation of NAD(P)H in Ca(2+)-loaded mitochondria leads to a loss of NAD(+) and NADP(+). It is proposed that the redox state of mitochondrial pyridine nucleotides can be or is in part controlled by glutathione peroxidase and glutathione reductase and is a factor in the balance of Ca(2+) between mitochondria and medium.
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442
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Magyar K, Heindorf J, Richter C. [Analysis of the plasmacytoma diseases in a large city]. ZEITSCHRIFT FUR DIE GESAMTE HYGIENE UND IHRE GRENZGEBIETE 1979; 25:626-7. [PMID: 506340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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443
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Richter C, Winterhalter KH, Cherry RJ. Rotational diffusion of cytochrome P-450 in rat liver microsomes. FEBS Lett 1979; 102:151-4. [PMID: 456583 DOI: 10.1016/0014-5793(79)80948-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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444
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445
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Magyar K, Heindorf J, Richter C. [Prostatic cancer--a territorial epidemiological contribution]. ZEITSCHRIFT FUR DIE GESAMTE HYGIENE UND IHRE GRENZGEBIETE 1978; 24:946-8. [PMID: 735235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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446
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Magyar K, Heindorf J, Richter C. [A decennial report on prostatic cancer]. ZEITSCHRIFT FUR DIE GESAMTE HYGIENE UND IHRE GRENZGEBIETE 1978; 24:784-5. [PMID: 735213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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447
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Magyar K, Heindorf J, Richter C. [Socio-hygienic and epidemiologic studies on selected tumor diseases]. ZEITSCHRIFT FUR DIE GESAMTE HYGIENE UND IHRE GRENZGEBIETE 1978; 24:561-3. [PMID: 695782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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448
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Weser U, Richter C, Wendel A, Younes M. Reactivity of antiinflammatory and superoxide dismutase active Cu(II)-salicylates. BIOINORGANIC CHEMISTRY 1978; 8:201-13. [PMID: 206291 DOI: 10.1016/s0006-3061(00)80196-9] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The activity of chelated Cu(II) with four different aspirin-like drugs in various superoxide dismutase assays was examined. Prior to these studies the oxidation state of the involved copper was measured by x-ray photoelectron spectrometry and was found to be +II throughout. All copper complexes were able to suppress the xanthine-xanthine oxidase mediated reduction of both cytochrome c and nitroblue tetrazolium as well as the formazan formation by KO2 in a specific manner. The hydroxylation of benzo-[alpha]-pyrene as well as the demethylation of 7-ethoxycoumarin using induced hepatic rat microsomes could be successfully inhibited by the employed Cu(II) chelates. Cu(II)-acetylsalicylate was the most active copper complex. Our findings support the proposal that Cu(II) chelates are the active forms of aspirin-like antiinflammatory agents.
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449
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Richter C, Azzi A, Weser U, Wendel A. Hepatic microsomal dealkylations. Inhibition by a tyrosine-copper (II) complex provided with superoxide dismutase activity. J Biol Chem 1977; 252:5061-6. [PMID: 873930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The effect of a divalent copper-tyrosine complex has been evaluated in rat liver microsome-catalyzed dealkylations. The copper complex, which is provided with superoxide dismutase activity, inhibits at micromolar concentrations aminopyrine, p-nitroanisol, and 7-ethoxycoumarin dealkylations. It has also been found that cumene hydroperoxide-supported p-nitroanisol demethylation, the formation of a 440 nm species, and the formation of superoxide radicals are inhibited by the divalent copper complex. On the other hand, 3-chloroperbenzoic acid has been found to support a copper complex-insensitive 7-ethoxycoumarin dealkylation. Oxygen uptake by rat liver microsomes is also inhibited by the copper complex. The data support the concept that the copper complex acts as a superoxide dismutase at the level of a cytochrome P-450 intermediate species, liganded with superoxide anions.
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450
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Richter C. Inhibition of firefly bioluminescence by scavengers of singlet oxygen, superoxide radicals and hydroxyl radicals. EXPERIENTIA 1977; 33:860-2. [PMID: 196884 DOI: 10.1007/bf01951244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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