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  • Biochemistry and Biotechnology  (4)
  • Nuclear reactions  (4)
  • Furosemide  (2)
  • 1
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1440
    Keywords: Low-renin essential hypertension ; Furosemide ; Plasma renin activity ; Aldosterone ; 18-Hydroxycorticosterone ; Low-renin Hypertonie ; Furosemid ; Plasmareninaktivität ; Aldosteron ; 18-Hydroxycorticosteron
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Verhalten der Plasmareninaktivität (PRA), des Plasmaaldosterons, des 18-Hydroxycorticosterons (18-OH-B), des 18-Hydroxydeoxycorticosterons (18-OH-DOC) und des Corticosterons wurde nach Furosemid an 20 Normalpersonen, 16 Patienten mit normal-renin Hypertonie (NREH) und 12 Patienten mit low-renin Hypertonie (LREH) untersucht. Die Blutentnahmen erfolgten unmittelbar vor der Gabe von 40 mg Furosemid i.v. sowie 15 min (im Liegen) und 120 min (aktive Orthostase) danach. Die Normalpersonen zeigten 15 min nach Furosemid einen Anstieg der PRA von 0,8±0,4 ng AI/ml·min (SD) auf 3,4±1,4 (P〈0,01), des Plasmaaldosterons von 109±28 pg/ml auf 139±40 (P〈0,01) und des 18-OH-B von 199±90 pg/ml auf 279±85 (P〈0,01). Bei Patienten mit NREH stieg die PRA signifikant geringer an (P〈0,01). Dementsprechend wurde kein signifikanter Anstieg des Plasmaaldosterons und des 18-OH-B gefunden. Bei Patienten mit LREH blieb die PRA (basal 0,2±0,1) 15 min nach Furosemid praktisch unverändert. Das Plasmaaldosteron jedoch stieg von 111±37 auf 160±66 (P〈0,05) und das 18-OH-B von 162±101 auf 261±71 an (P〈0,01). Der relative Anstieg des 18-OH-B bei Patienten mit LREH war im Vergleich zu Patienten mit NREH signifikant höher. 120 min nach Furosemid lagen die Plasmaspiegel des Aldosterons und des 18-OH-B bei Normalpersonen signifikant höher als in den beiden Patientengruppen (P〈0,01). Die Corticosteron und 18-OH-DOC Plasmaspiegel zeigten zwischen den untersuchten Gruppen kein differentes Verhalten, und es fand sich nur 120 min nach Furosemid in Kombination mit aktiver Orthostase ein signifikanter Anstieg. Die Ergebnisse zeigen, daß die Sekretion der Mineralcorticoide bei Patienten mit LREH unmittelbar nach Furosemid gesteigert ist, obwohl die PRA unverändert bleibt. 18-OH-B ist anscheinend für dieses Phänomen ein empfindlicherer Index als Aldosteron.
    Notes: Summary The response of plasma renin activity (PRA), plasma aldosterone, 18-hydroxycorticoster-one (18-OH-B), 18-hydroxydeoxycorticosterone (18-OH-DOC) and corticosterone to furosemide were compared in 20 normal control subjects, 16 patients with normal-renin essential hypertension (NREH) and 12 patients with low-renin essential hypertension (LREH). Analyses were performed before medication, and 15 min (supine) and 120 min (active orthostasis) after IV administration of 40 mg furosemide. In normotensive subjects PRA increased 15 min after administration of furosemide from 0.8±0.4 ng AI/ml·h (SD) to 3.4±1.4 (P〈0.01), plasma aldosterone from 109±28 pg/ml to 139±40 (P〈0.01) and 18-OH-B from 199±90 to 279±85 (P〈0.01). In patients with NREH, PRA increased significantly less (P〈0.01) and no significant increase of plasma aldosterone or 18-OH-B was found. PRA of patients with LREH (0.2±0.1 ng AI/ml·h) remained practically unchanged 15 min after furosemide administration, but in contrast to NREH aldosterone increased from 111±37 to 160±66 (P〈0.05) and 18-OH-B from 162±101 to 261±71 pg/ml (P〈0.01). The relative increase of plasma 18-OH-B was significantly greater in patients with LREH than in patients with NREH. The plasma levels of aldosterone and 18-OH-B 120 min after furosemide administration were significantly higher in normotensive subjects than in either hypertensive group (P〈0.01). Corticosterone and 18-OH-DOC levels were the same in all investigated groups and increased significantly (P〈0.01) only at 120 min after furosemide administration combined with active orthostasis. In summary, our results support the concept that sensitivity of the mineralocorticoid-producing cells is enhanced in patients with LREH. Postfurosemide 18-OH-B seems to be a better marker of this phenomenon than aldosterone.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 62 (1984), S. 777-782 
    ISSN: 1432-1440
    Keywords: Prostaglandins ; Furosemide ; Renin ; Potassium ; Kidney function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We examined the urinary excretion of prostaglandin (PG)E2 and PGF2α before and 15 min after stimulation with the acutely vasodilating agent furosemide in 25 normotensive controls and 81 patients with essential hypertension (EH). After furosemide administration, PGE2 excretion was lower in patients with EH (P〈0.02). Excretion rates of PGF2α and of sodium, and urinary volume in hypertensive patients were not significantly different from the values found in normotensive controls. Patients with low-renin essential hypertension (LREH) had a significantly reduced excretion of both PGE2 and PGF2α before and after administration of furosemide as compared to controls. The difference in PGF2α excretion was also significant when LREH patients were compared to those with normal-renin essential hypertension (NREH). Patients with LREH were older and excreted less potassium than patients with NREH or normotensive controls. We conclude that the reduced PG excretion immediately after furosemide administration in patients with EH reflects a diminished capacity of the hypertensive kidney to generate prostaglandins which exert an overall vasodilating effect. Since renin secretion is under the control of renal PG formation, the decreased responsiveness of plasma renin activity (PRA) observed in patients with EH and predominantly in those with LREH may be the consequence of a decreased renal cortical PG generation. Alternatively, mechanisms that reduce both PRA and PG generation have to be considered.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 18 (1994), S. 107-118 
    ISSN: 0887-3585
    Keywords: protein crystallography ; four helix bundle ; iron ; macromolecular assembly ; regulation ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Ferritin is a 24 subunit protein that controls biomineralization of iron in animals, bacteria, and plants. Rates of mineralization vary among members of the ferritin family, particularly between L and H type subunits of animal ferritins which are differentially expressed in various cell types. To examine ferritin from a highly differentiated cell type and to clarify the relationship between ferritin structure and function, bullfrog red cell L ferritin has been cloned, overexpressed in E. coli, and crystallized under two conditions. Crystals were obtained at high ionic strength in the presence of MnCl2 at a concentration comparable to that of the protein and in the presence of MgCl2 at a concentration much higher than that of the protein. Under both crystallization conditions, the crystals are tetragonal bipyramids in the space group F432 with unit cell dimensions a=b=c= 182 ± 0.5 Å. Crystals obtained in the presence of manganese and ammonium sulfate diffract to 1.9 Å, while those obtained in the presence of magnesium and sodium tartrate diffract to 1.6 Å. Isomorphous crystals have been obtained under similar conditions for a site-directed mutant with a reduced mineralization rate in which Glu-57, -58, -59, and -61 are all replaced by Ala. The structure of wild type L-subunit with magnesium has been solved by molecular replacement using the calcium salt of human liver H subunit (Lawson et al., Nature (London) 349:541-544, 1991) as the model. The crystallographic R factor for the 6-2.2 Å shell is 0.21. The overall fold of human H and bullfrog L ferritins is similar with an rms difference in backbone atomic positions of 0.97 Å. The largest structural differences occur in the D helix and the loop connecting the D and E helices of the four helix bundle. Because red cell L ferritin and liver H ferritin show differences in both rates of mineralization and three-dimensional structure, more detailed comparisons of these structures are likely to shed new light on the relationship between conformation and function. © 1994 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 6 (1989), S. 70-85 
    ISSN: 0887-3585
    Keywords: Protein electrostatics ; protein kinases ; effector protein ; calciumbinding protein ; α-helix ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Calmodulin's calculated electrostatic potential surface is asymmetrically distributed about the molecule. Concentrations of uncompensated negative charge are localized near certain α-helices and calcium-binding loops. Further calculations suggest that these charge features of calmodulin can be selectively perturbed by changing clusters of phylogenetically conserved acidic amino acids in helices to lysines. When these cluster charge reversals are actually produced by using cassette-based site-specific mutagenesis of residues 82-84 or 118-120, the resulting proteins differ in their interaction with two distinct calmodulin-dependent protein kinases, myosin light chain kinase and calmodulin-ldependent protein kinase II. Each calmodulin mutant can be purified to apparent chemical homogeneity by an identical purification protocol that is based on conservation of its overall properties, including calcium binding. Although cluster charge reversals result in localized perturbations of the computed negative surface, single amino acid changes would not be expected to alter significantly the distribution of the negative surface because of the relatively high density of uncompensated negative charges in the region around residues 82-84 and 118-120. However, this does not preclude the possibility of single amino acid charge perturbations having a functional effect on the more intimate, catalytically active complex. The electrostatic surface of calmodulin described in this report may be a feature that would be altered only by cluster charge reversal mutations. Overall, the results suggest that the charge properties that are important for the efficient assembly of calmodulin-protein kinase signal transduction complexes in eukaryotic cells.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 13 (1995), S. 273-277 
    ISSN: 0263-6484
    Keywords: adhesion ; HMG-CoA reductase ; HUVEC ; mevalonate ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The proliferation of human monocytic Mono Mac 6 cells was significantly retarded by treatment with lovastatin (LOV, 10 μM) for 72 h. Treatment of Mono Mac 6 cells with LOV increased surface protein expression of monocyte-associated CD14 and the integrin-chain CD11b towards levels found in isolated human blood monocytes. These effects were dose-dependent and completely reversed by the isoprenoid precursor mevalonate (MVA). LOV failed to induce growth retardation and upregulation of CD11b or CD14 in the less mature premonocytic U937 cell line. While CD11b expression was comparable in Mono Mac 6 cells treated with LOV (10 μM), TNF (100 U ml-1) or LPS (10 ng ml-1), upregulation of CD14 by LOV was less pronounced. Basal CD23 expression was unaffected by LOV but markedly reduced by treatment with TNF or LPS. Moreover, LOV enhanced Mono Mac 6 adhesiveness to human umbilical vein endothelial cells to levels found in isolated human blood monocytes, probably due to the increased CD11b and CD14 expression. In conclusion, LOV can induce differentiation of monocytic cells which is reflected by the retardation of growth, expression of CD14 and CD11b, and enhanced adhesiveness.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 13 (1995), S. 211-216 
    ISSN: 0263-6484
    Keywords: n-3 polyunsaturated fatty acids ; CD36 ; monocytic cells ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: CD36, a multifunctional adhesion receptor e.g. for thrombospondin and collagen, as well as a scavenger receptor for oxidized low density lipoprotein, is expressed e.g. on platelets and monocytes. By this dual role it might be involved in early steps of atherosclerosis like the recruitment of monocytes and formation of foam cells. We therefore studied the effects of n-3 fatty acids on CD36 expression in human monocytic cells. Incorporation of eicosapentaenoic acid (EPA, C20:5n-3) and docosahexaenoic acid (DHA, C22:6n-3) into cellular phospholipids resulted in a significant reduction of CD36 expression at the mRNA and protein level, whereas arachidonic acid (AA, C20: 4n-6) and linoleic acid (LA, C18:2n-6) tended to increase CD36 expression compared to the control. This specific down-regulation of CD36 by n-3 fatty acids in cells involved in the initiation and progression of atherogenesis and inflammation, represents a further mechanism that may contribute to the beneficial effects of n-3 polyunsaturated fatty acids (PUFA) in these disorders.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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