551
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Mookerjea S, Yung JW. Stimulation of galactosyltransferase in liver microsomes by lysolecithin. Biochem Biophys Res Commun 1974; 57:815-22. [PMID: 4857148 DOI: 10.1016/0006-291x(74)90619-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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552
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553
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Stechschulte DJ, Austen KF. Phosphatidylserine enhancement of antigen-induced mediator release from rat mast cells. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1974; 112:970-8. [PMID: 4130116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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554
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Teng MH, Kaplan A. Purification and properties of rat liver lysosomal lipase. J Biol Chem 1974; 249:1064-70. [PMID: 4814338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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555
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Kimelberg HK, Papahadjopoulos D. Effects of phospholipid acyl chain fluidity, phase transitions, and cholesterol on (Na+ + K+)-stimulated adenosine triphosphatase. J Biol Chem 1974; 249:1071-80. [PMID: 4273517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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556
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Sharp CW, Hunt DG, Clements ST, Wilson WE. The influence of dichlorodiphenyltrichloroethane, polychlorinated biphenyls and anionic amphiphilic compounds on stabilization of sodium- and potassium-activated adenosine triphosphatases by acidic phospholipids. Mol Pharmacol 1974; 10:119-20. [PMID: 4367709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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557
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Garland LG, Mongar JL. Inhibition by cromoglycate of histamine release from rat peritoneal mast cells induced by mixtures of dextran, phosphatidyl serine and calcium ions. Br J Pharmacol 1974; 50:137-43. [PMID: 4132696 PMCID: PMC1776568 DOI: 10.1111/j.1476-5381.1974.tb09601.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
1 Dextran releases histamine from rat peritoneal mast cells in the presence but not in the absence of phosphatidyl serine (PS). With PS (10 mug/ml) present the effect of dextran was concentration-dependent in the range of 0.2-6 mg/ml.2 PS releases little histamine on its own but mixed with dextran (6 mg/ml) produces a graded effect in the range of 0.3-10 mug/ml.3 The combination of dextran and PS releases no histamine in a medium containing less than 0.1 mM calcium. As the calcium concentration is increased, release occurs and a maximum is reached at calcium 1 mM; at higher concentrations release falls off sharply.4 Histamine release by the combination of dextran (6 mg/ml), PS (10 mug/ml) and calcium (1.8 mM) is inhibited by cromoglycate in the same range (1-30 muM) that inhibits anaphylactic histamine release from rat peritoneal cells.5 Inhibition by cromoglycate occurred with all dextran concentrations tested (0.2-15 mg/ml) but high concentrations of PS (30 and 100 mug/ml) overcame the effect of cromoglycate (2 and 10 muM). Calcium concentrations above 1 mM augmented inhibition by cromoglycate 2 and 10 muM.
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558
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Charnock JS, Cook DA, Almeida AF, To R. Activation energy and phospholipid requirements of membrane-bound adenosine triphosphatases. Arch Biochem Biophys 1973; 159:393-9. [PMID: 4274086 DOI: 10.1016/0003-9861(73)90466-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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559
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Chuang TF, Crane FL. Phospholipids in the cytochrome oxidase reaction. JOURNAL OF BIOENERGETICS 1973; 4:563-78. [PMID: 4358876 DOI: 10.1007/bf01516208] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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560
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Zwaal RF, Roelofsen B, Colley CM. Localization of red cell membrane constituents. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 300:159-82. [PMID: 4276919 DOI: 10.1016/0304-4157(73)90003-8] [Citation(s) in RCA: 371] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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561
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Racker E, Kandrach A. Partial resolution of the enzymes catalyzing oxidative phosphorylation. XXXIX. Reconstitution of the third segment of oxidative phosphorylation. J Biol Chem 1973; 248:5841-7. [PMID: 4353278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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562
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Kirschbaum BB, Bosmann HB. Lysolecithin enhancement of glycoprotein: glycosyl transferase activity. FEBS Lett 1973; 34:129-32. [PMID: 4747834 DOI: 10.1016/0014-5793(73)80773-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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563
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Kunimoto T, Umezawa H. Kinetic studies on the inhibition of (Na+++K+)-ATPase by diketocoriolin B. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 318:78-90. [PMID: 4270539 DOI: 10.1016/0005-2736(73)90338-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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564
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Chakravarty N, Goth A, Sen P. Potentiation of dextran-induced histamine release from rat mast cells by phosphatidyl serine. ACTA PHYSIOLOGICA SCANDINAVICA 1973; 88:469-80. [PMID: 4128878 DOI: 10.1111/j.1748-1716.1973.tb05476.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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565
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Saito M, Kanfer J. Solubilization and properties of a membrane-bound enzyme from rat brain catalyzing a base-exchange reaction. Biochem Biophys Res Commun 1973; 53:391-8. [PMID: 4736814 DOI: 10.1016/0006-291x(73)90674-8] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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566
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Swanljung P, Frigeri L, Ohlson K, Ernster L. Studies on the activation of purified mitochondrial ATPase by phospholipids. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 305:519-33. [PMID: 4354789 DOI: 10.1016/0005-2728(73)90073-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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567
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Rahman YE, Wright BJ, Cerny EA. Studies on the mechanism of erythrocyte aging and destruction. II. Membrane fragmentation in rat erythrocytes after in vitro treatment with lysophosphatides: scanning electron microscope studies. Mech Ageing Dev 1973; 2:151-62. [PMID: 4738367 DOI: 10.1016/0047-6374(73)90013-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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568
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Yamashita K, Field JB. The role of phospholipids in TSH stimulation of adenylate cyclase in thyroid plasma membranes. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 304:686-92. [PMID: 4353696 DOI: 10.1016/0304-4165(73)90213-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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569
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Hanahoe TH, Tanner T, West GB. Resistance of rats to the potentiating action of phosphatidyl serine on dextran responses. J Pharm Pharmacol 1973; 25:429-31. [PMID: 4124330 DOI: 10.1111/j.2042-7158.1973.tb10046.x] [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: 01/09/2023]
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570
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571
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Taniguchi K, Iida S. The role of phospholipids in the binding of ouabain to sodium- and potassium-dependent adenosine triphosphatase. Mol Pharmacol 1973; 9:350-9. [PMID: 4267958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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572
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Păusescu E, Chirvasie R. Biochemical changes in the platelet energy transferring system during concomitant action of cephalin and serotonin. Br J Haematol 1973; 24:605-12. [PMID: 4145888 DOI: 10.1111/j.1365-2141.1973.tb01686.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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573
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574
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Karibian D. Dihydro-orotate dehydrogenase of Escherichia coli K12: effects of triton X-100 and phospholipids. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 302:205-15. [PMID: 4572995 DOI: 10.1016/0005-2744(73)90149-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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575
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Chipperfield AR, Whittam R. Reconstitution of the sodium pump from protein and phosphatidylserine: features of ouabain binding. J Physiol 1973; 230:467-76. [PMID: 4267760 PMCID: PMC1350373 DOI: 10.1113/jphysiol.1973.sp010198] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
1. A study has been made of ATP splitting and ouabain binding to the sodium pump reconstituted from protein and phosphatidylserine.2. Ouabain was bound to protein alone, but when phosphatidylserine was added, binding was increased threefold. The stimulation resembled the course of activation of sodium-dependent ATPase activity.3. EGTA partly simulated the activation of ATPase by phosphatidylserine but did not enhance binding.4. The dissociation constant for the enzyme-ouabain complex was 3.5 x 10(-8)M. The turnover number (2,000 molecules of ATP per minute) and the number of receptor sites (3.8 x 10(13) per mg protein) were calculated.5. The results provide further evidence of the involvement of phosphatidylserine in the action of the sodium pump.
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576
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Schulze HU, Gallenkamp H, Staudinger H. [Effect of membrane lipids on the activity of NADH:semidehydroascorbic acid oxidoreductase (EC 1.6.5.4) of rat liver microsomes]. HOPPE-SEYLER'S ZEITSCHRIFT FUR PHYSIOLOGISCHE CHEMIE 1973; 354:391-406. [PMID: 4154271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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577
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Foreman JC, Mongar JL. The interaction of calcium and strontium with phosphatidyl serine in the anaphylactic secretion of histamine. J Physiol 1973; 230:493-507. [PMID: 4122664 PMCID: PMC1350375 DOI: 10.1113/jphysiol.1973.sp010200] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
1. Spontaneous histamine release from isolated mast cells was found to be independent of calcium in the concentration range up to 1 m-mole/l. Phosphatidyl serine did not change the effect of calcium on spontaneous release.2. Spontaneous histamine release was found to vary with the strontium ion concentration. Graded increase in the release occurred as the concentration of strontium was raised from 1 to 10 m-mole/l. Phosphatidyl serine potentiated this action of strontium; the potentiation showed a graded increase as the phosphatidyl serine concentration was raised from 1 to 100 mug/ml.3. The activation of anaphylactic histamine release by calcium was potentiated by phosphatidyl serine; the degree of potentiation showed a graded increase as the calcium concentration was raised from 0.1 to 1.0 m-mole/l.4. The activation of anaphylactic histamine release by strontium showed little, if any, potentiation by phosphatidyl serine.5. The response of the mast cells, in terms of anaphylactic histamine release, to calcium, in the presence of optimal concentrations of phosphatidyl serine, was found to be similar to that observed in the presence of strontium alone.6. These observations are discussed in terms of the concepts of affinity and efficacy of the ions at their receptor sites.
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578
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Garland LG, Mongar JL. Inhibition by cromoglycate of histamine release induced by dextran plus phosphatidyl serine. Br J Pharmacol 1973; 47:627P-628P. [PMID: 4125926 PMCID: PMC1776341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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579
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Marciniak E. Factor-Xa inactivation by antithrombin. 3. Evidence for biological stabilization of factor Xa by factor V-phospholipid complex. Br J Haematol 1973; 24:391-400. [PMID: 4713637 DOI: 10.1111/j.1365-2141.1973.tb01662.x] [Citation(s) in RCA: 94] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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580
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Kariya M, Kaplan A. Effects of acidic phospholipids, nucleotides, and heparin on the activity of lipase from rat liver lysosomes. J Lipid Res 1973; 14:243-9. [PMID: 4698271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Purification and characterization of endogenous lipid factors that stimulate rat liver lysosomal lipase has led to the identification of cardiolipin, phosphatidylserine, and phosphatidic acid as stimulators of this activity. Bovine heart cardiolipin (half-maximal stimulation at 1.5 x 10(-4) m) and bovine brain phosphatidylserine (half-maximal stimulation at 9.5 x 10(-4) m) were the most potent of the phospholipids from other sources tested. The major rate-enhancing effect of phosphatidylserine is expressed as a 35-fold increase in the apparent V(max) of the enzyme. The effect is produced by acid phospholipids specifically, since in no case was there greater than a twofold stimulation by synthetic detergents, zwitterionic phospholipids, taurocholic acid, or gum acacia. The observed degree of stimulation depends upon the detergent used to disperse tripalmitin substrate and the relative concentrations of factor and detergent in reaction mixtures. The concentration of phosphatidylserine to produce half-maximal stimulation is directly dependent upon the Triton X-100 concentration, but the effects of this detergent on cardiolipin stimulation are more complex. Enzyme activity is inhibited 50% by 1 mm nucleoside triphosphate and 2.5 mm ADP, 80% by 1 mm PP(i), 100% by 20 U/ml heparin and 0.25 mg/ml chondroitin sulfate, and 80% by 10 mm sulfate ion. Inhibition is partially prevented by phosphatidylserine.
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581
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Goldman SS, Albers RW. Sodium-potassium-activated adenosine triphosphatase. IX. The role of phospholipids. J Biol Chem 1973; 248:867-74. [PMID: 4346355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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582
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Foreman JC. The mechanism of spontaneous histamine release from mast cells. J Physiol 1973; 229:8P-9P. [PMID: 4120359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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583
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Specht SC, Robinson JD. Stimulation of the (Na + + K + )-dependent adenosine triphosphatase by amino acids and phosphatidylserine: chelation of trace metal inhibitors. Arch Biochem Biophys 1973; 154:314-23. [PMID: 4347683 DOI: 10.1016/0003-9861(73)90063-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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584
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Rose SP, Fox CF. The beta-glucoside system of Escherichia coli. 3. Properties of a P-HPr: beta-glucoside phosphotransferase extracted from membranes with detergent. JOURNAL OF SUPRAMOLECULAR STRUCTURE 1973; 1:565-87. [PMID: 4592819 DOI: 10.1002/jss.400010610] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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585
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Stechschulte DJ, Austen KF. Control mechanisms of antigen-induced histamine release from rat peritoneal cells. INTERNATIONAL ARCHIVES OF ALLERGY AND APPLIED IMMUNOLOGY 1973; 45:110-9. [PMID: 4125510 DOI: 10.1159/000231012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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586
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Lezius A, Müller-Lornsen B. Effects of phospholipids and dimethylsulfoxide on the activity of RNA polymerase A from mouse myeloma cells. HOPPE-SEYLER'S ZEITSCHRIFT FUR PHYSIOLOGISCHE CHEMIE 1972; 353:1872-6. [PMID: 4675372 DOI: 10.1515/bchm2.1972.353.2.1872] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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587
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Abstract
1. Histamine release by antigen from three sensitized rat tissues is potentiated by phosphatidyl serine (PS). The effect is greatest with isolated peritoneal cells. Phosphatidyl inositol, ethanolamine, choline and phosphatidic acid are inactive.2. PS greatly increases the rate of antigen-induced histamine release and only slightly prolongs the duration of the release process.3. PS shows a concentration-dependent effect over the range 1-10 mug/ml. At 10 mug/ml it is active over a wide range of antigen concentrations.4. Calcium ions are necessary for the potentiation by PS of antigen-induced histamine release from rat peritoneal cells.
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588
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Rethy A, Tomasi V, Trevisani A, Barnabei O. The role of phosphatidylserine in the hormonal control of adenylate cyclase of rat liver plasma membranes. BIOCHIMICA ET BIOPHYSICA ACTA 1972; 290:58-69. [PMID: 4344972 DOI: 10.1016/0005-2736(72)90052-1] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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589
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Gouault-Heilmann M, Varet B, Romano C, Josso F. [In-vitro "thromboplastic" activity of leukocytes and intravascular blood coagulation in leukemias]. PATHOLOGIE-BIOLOGIE 1972:Suppl:56-64. [PMID: 4574606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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590
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Turner DL, Holburn RR, Silver MJ, Baczynski E. Anticoagulant activity of glycol analogs of phosphatidylserine. Lipids 1972; 7:680-2. [PMID: 4635561 DOI: 10.1007/bf02533077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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591
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Kasuya M. Effects of inorganic, aryl, alkyl and other mercury compounds on the outgrowth of cells and fibers from dorsal root ganglia in tissue culture. Toxicol Appl Pharmacol 1972; 23:136-46. [PMID: 5071037 DOI: 10.1016/0041-008x(72)90213-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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592
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Pitotti A, Contessa AR, Dabbeni-Sala F, Bruni A. Activation by phospholipids of particulate mitochondrial ATPase from rat liver. BIOCHIMICA ET BIOPHYSICA ACTA 1972; 274:528-35. [PMID: 4340262 DOI: 10.1016/0005-2736(72)90198-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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593
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594
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Umbreit JN, Strominger JL. Complex lipid requirements for detergent-solubilized phosphoacetylmuramyl-pentapeptide translocase from Micrococcus luteus. Proc Natl Acad Sci U S A 1972; 69:1972-4. [PMID: 4340168 PMCID: PMC426843 DOI: 10.1073/pnas.69.7.1972] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Phospho-MurNAc-pentapeptide translocase activity in the membrane of M. luteus was lost upon addition of the detergent, Triton X-100, but could be restored by addition of lipid fractions to the assay. By assay in the presence of lipid, the activity of the Triton-solubilized enzyme could be measured. The synthesis of C(55)-isoprenyl-P-P-MurNAc-pentapeptide from UDP-MurNAc-pentapeptide required C(55)-isoprenyl-P, and was stimulated by a neutral lipid. The exchange reaction of UDP-MurNAc-pentapeptide with UMP required a polar lipid fraction, but the reaction was not affected by C(55)-isoprenyl-P or the neutral lipid. Thus, measurement of activity of the detergent-solubilized enzyme requires addition of three lipids, the lipid substrate (C(55)-isoprenyl-P), the neutral lipid, and a polar lipid.
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595
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Tai HH, Bloch K. Squalene epoxidase of rat liver. J Biol Chem 1972; 247:3767-73. [PMID: 5033388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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596
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Levey GS, Klein I. Solubilized myocardial adenylate cyclase. Restoration of histamine responsiveness by phosphatidylserine. J Clin Invest 1972; 51:1578-82. [PMID: 4336944 PMCID: PMC292296 DOI: 10.1172/jci106955] [Citation(s) in RCA: 47] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
We have recently described the preparation of a solubilized cat myocardial adenylate cyclase which is unresponsive to histamine, norepinephrine, glucagon, and thyroxine, the hormones which activate the particulate enzyme. Since hormone receptors may consist of proteins and phospholipids, we determined the effect of several phospholipids on restoring the responsiveness of the solubilized adenylate cyclase to histamine. The addition of phosphatidylserine completely restored the histamine-mediated activation of the solubilized enzyme in contrast to phosphatidylethanolamine and phosphatidylinositol which were without effect. The concentration of histamine producing half-maximal activation of adenylate cyclase, 2 x 10(-5) M, was virtually identical with that observed in the particulate preparation. The antihistamine, diphenhydramine, 8 x 10(-5) M, abolished activation of adenylate cyclase by histamine in both the solubilized and particulate preparations. Phosphatidylserine also restored glucagon responsiveness, but did not restore norepinephrine responsiveness. It would appear that phosphatidylserine produced the necessary molecular configuration of the adenylate cyclase for histamine binding and activation of the enzyme.
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597
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Sahagian BM, Spraragen SC. Divalent cation uptakes by rabbit aorta--interaction with phospholipids. J Nutr 1972; 102:673-9. [PMID: 5022201 DOI: 10.1093/jn/102.5.673] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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598
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Gilbert B, Da Rosa MN, Borojević R, Pellegrino J. Schistosoma mansoni: in vitro transformation of cercariae into schistosomula. Parasitology 1972; 64:333-9. [PMID: 4336210 DOI: 10.1017/s0031182000029760] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The transformation of cercariae ofSchistosoma mansoniinto schistosomula has previously been achieved by passage through membranes of biological origin. This transformation has now been effected in the absence of a membrane. Chemical stimulus for transformation results from contact with human or rat skin lipid and fractionation of the latter led to localization of the active component in a fraction containing phospholipids. The series of processes involved in transformation was subsequently found to be set in motion by the action of egg lecithin-water mixtures on an aqueous suspension of cercariae and yields of 90% of live schistosomula may be obtained reproducibly with crude egg lecithin-water in the ratio 1:50. The juvenile worms were found, by accepted criteria, to be identical to those produced by the normal penetration procedure. Purified lecithin does not produce the same stimulus and the effect of the physical state and of possible impurities present in crude egg lecithin is discussed.This work was supported by the Conselho Nacional de Pesquisas (Brazil), the Banco Nacional de Desenvolvimento Econâmico FUNTEC contracts nos. 99 and 110 (Brazil), U.S. Army Grants nos. DAHC-19-70-G-0017 (to B.G.) and DAHC-19-70-G-0070 (to J.P.) and by the FORGE Foundation. Contribution no. 18 from the Schistosomiasis Research Unit, Institute of Biological Sciences, Federal University of Minas Gerais, Brazil.
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599
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