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Kuleshova LG, Gordienko EA, Kovalenko IF. Permeability of isolated rat hepatocyte plasma membranes for molecules of dimethyl sulfoxide. Biophysics (Nagoya-shi) 2014. [DOI: 10.1134/s0006350914030154] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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2
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Pagès G, Puckeridge M, Liangfeng G, Tan Y, Jacob C, Garland M, Kuchel P. Transmembrane exchange of hyperpolarized 13C-urea in human erythrocytes: subminute timescale kinetic analysis. Biophys J 2013; 105:1956-66. [PMID: 24209840 PMCID: PMC3824547 DOI: 10.1016/j.bpj.2013.09.034] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Revised: 08/28/2013] [Accepted: 09/24/2013] [Indexed: 11/15/2022] Open
Abstract
The rate of exchange of urea across the membranes of human erythrocytes (red blood cells) was quantified on the 1-s to 2-min timescale. (13)C-urea was hyperpolarized and subjected to rapid dissolution and the previously reported (partial) resolution of (13)C NMR resonances from the molecules inside and outside red blood cells in suspensions was observed. This enabled a stopped-flow type of experiment to measure the (initially) zero-trans transport of urea with sequential single-pulse (13)C NMR spectra, every second for up to ~2 min. Data were analyzed using Bayesian reasoning and a Markov chain Monte Carlo method with a set of simultaneous nonlinear differential equations that described nuclear magnetic relaxation combined with transmembrane exchange. Our results contribute to quantitative understanding of urea-exchange kinetics in the whole body; and the methodological approach is likely to be applicable to other cellular systems and tissues in vivo.
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Affiliation(s)
| | - Max Puckeridge
- School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia
| | - Guo Liangfeng
- Institute of Chemical and Engineering Sciences, ASTAR, Singapore
| | - Yee Ling Tan
- Singapore Bioimaging Consortium, ASTAR, Singapore
| | - Chacko Jacob
- Institute of Chemical and Engineering Sciences, ASTAR, Singapore
| | - Marc Garland
- Institute of Chemical and Engineering Sciences, ASTAR, Singapore
| | - Philip W. Kuchel
- Singapore Bioimaging Consortium, ASTAR, Singapore
- School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia
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3
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Yamaguchi T, Iwata Y, Miura S, Maehara Y, Nozawa K. Enhancement of Pressure-Induced Hemolysis by Aquaporin-1 Inhibitors in Human Erythrocytes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2012. [DOI: 10.1246/bcsj.20110285] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takeo Yamaguchi
- Department of Chemistry, Faculty of Science, Fukuoka University
| | - Yohei Iwata
- Department of Chemistry, Faculty of Science, Fukuoka University
| | - Shingo Miura
- Department of Chemistry, Faculty of Science, Fukuoka University
| | - Yukari Maehara
- Department of Chemistry, Faculty of Science, Fukuoka University
| | - Kazuyuki Nozawa
- Department of Chemistry, Faculty of Science, Fukuoka University
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4
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Gordiyenko OI, Linnik TP, Gordiyenko EO. Erythrocyte membrane permeability for a series of diols. Bioelectrochemistry 2004; 62:115-8. [PMID: 15039012 DOI: 10.1016/j.bioelechem.2003.08.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2003] [Revised: 08/16/2003] [Accepted: 08/25/2003] [Indexed: 11/24/2022]
Abstract
Erythrocyte membrane permeability coefficients for a series of diols have been defined by the method developed. The method is based on the physical and mathematical modeling of hypotonic hemolysis process. There have been also determined membrane permeability coefficients for erythrocytes treated with p-chloromercuribenzenesulfonic acid monosodium salt (pCMBS), which is known to block aqueous protein channels. Permeating process is shown to be conditioned both by hydrophilic/hydrophobic properties of the molecules and their geometrical parameters. The obtained results propose that, when exceeding the molecules diameter over a value of 4 A, the permeability coefficient reduces due to decreasing of flow through the aqueous protein pores of a constant size. Permeability coefficients for comparatively hydrophobic molecules are almost directly proportional to the coefficients of partition between hydrophobic and hydrophilic phases, by pointing to a lipid way of permeation of these molecules through erythrocyte membranes.
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Affiliation(s)
- O I Gordiyenko
- Department of Low Temperature Preservation, Institute for Problems of Cryobiology and Cryomedicine of the National Academy of Sciences of the Ukraine, 23, Pereyaslivska str., Kharkiv 61015, Ukraine.
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5
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Blank ME, Ehmke H. Aquaporin-1 and HCO3(-)-Cl- transporter-mediated transport of CO2 across the human erythrocyte membrane. J Physiol 2003; 550:419-29. [PMID: 12754312 PMCID: PMC2343058 DOI: 10.1113/jphysiol.2003.040113] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Recent studies have suggested that aquaporin-1 (AQP1) as well as the HCO3(-)-Cl- transporter may be involved in CO2 transport across biological membranes, but the physiological importance of this route of gas transport remained unknown. We studied CO2 transport in human red blood cell ghosts at physiological temperatures (37 degrees C). Replacement of inert with CO2-containing gas above a stirred cell suspension caused an outside-to-inside directed CO2 gradient and generated a rapid biphasic intracellular acidification. The gradient of the acidifying gas was kept small to favour high affinity entry of CO2 passing the membrane. All rates of acidification except that of the approach to physicochemical equilibrium of the uncatalysed reaction were restricted to the intracellular environment. Inhibition of carbonic anhydrase (CA) demonstrated that CO2-induced acidification required the catalytic activity of CA. Blockade of the function of either AQP1 (by HgCl2 at 65 microM) or the HCO3(-)-Cl- transporter (by DIDS at 15 microM) completely prevented fast acidification. These data indicate that, at low chemical gradients for CO2, nearly the entire CO2 transport across the red cell membrane is mediated by AQP1 and the HCO3--Cl- transporter. Therefore, these proteins may function as high affinity sites for CO2 transport across the erythrocyte membrane.
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Affiliation(s)
- Michael E Blank
- Institut für Vegetative Physiologie und Pathophysiologie, Universität Hamburg, Martinistrasse 52, D-20246 Hamburg, Germany
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6
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Xia J, Browning JD, O'Dell BL. Decreased plasma membrane thiol concentration is associated with increased osmotic fragility of erythrocytes in zinc-deficient rats. J Nutr 1999; 129:814-9. [PMID: 10203555 DOI: 10.1093/jn/129.4.814] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Zinc deficiency leads to pathological signs that are related to impaired function of plasma membrane proteins. The purpose of this study was to assess the effect of dietary zinc status on the sulfhydryl (SH) content of erythrocyte plasma membranes and erythrocyte function. Three experiments were performed. In the first, immature male rats were fed for 21 d either a low-zinc (<1.0 mg/kg) diet free choice (-ZnAL), an adequate-zinc (100 mg/kg) diet free choice (+ZnAL), or the adequate-zinc diet limited to the intake of -ZnAL pair-mates (+ZnPF). Tail blood was sampled to measure osmotic fragility and SH concentration of erythrocyte membrane proteins. The zinc-deficient rats were then repleted for 2 d and erythrocytes assayed for fragility and SH content. In the second experiment blood was sampled at 3-d intervals to determine the time course of change in fragility and SH concentration. In the third experiment the SH concentration of erythrocyte band 3 protein and the binding of zinc to isolated plasma membranes were measured. SH concentration decreased from approximately 75 nmol/mg protein to 68 nmol/mg protein during 21 d of depletion and returned to control level within 2 d of repletion. There was an inverse relationship between osmotic fragility and SH concentration of erythrocyte membrane proteins. Maximal decrease in SH occurred within 6 d of consuming the low-zinc diet. The SH content of band 3 protein isolated from deficient rats was also significantly lower than that of pair-fed controls (45 vs. 51 nmol/mg protein). The zinc-binding affinity of plasma membrane proteins tended to be decreased by zinc deficiency. In summary, low-zinc status lowers the plasma membrane SH concentration, and the decreased reducing potential is inversely related to osmotic fragility, and presumably, with impaired volume recovery of erythrocytes.
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Affiliation(s)
- J Xia
- Department of Biochemistry, University of Missouri, Columbia, MO 65211, USA
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7
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van Os CH, Deen PM, Dempster JA. Aquaporins: water selective channels in biological membranes. Molecular structure and tissue distribution. BIOCHIMICA ET BIOPHYSICA ACTA 1994; 1197:291-309. [PMID: 7529562 DOI: 10.1016/0304-4157(94)90011-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- C H van Os
- Department of Cell Physiology, University of Nijmegen, The Netherlands
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8
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van Os CH, Deen PM, Dempster JA. Aquaporins: Water selective channels in biological membranes. Molecular structure and tissue distribution. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0167-4781(94)00010-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Effect of thiol modification on the thermal stability of erythrocyte membranes. J Therm Biol 1994. [DOI: 10.1016/0306-4565(94)90062-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Martial S, Neau P, Degeilh F, Lamotte H, Rousseau B, Ripoche P. Urea derivatives as tools for studying the urea-facilitated transport system. Pflugers Arch 1993; 423:51-8. [PMID: 8488092 DOI: 10.1007/bf00374960] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The effects of urea structural analogues on the urea-facilitated diffusion system were examined in human red cell membranes (pink ghosts) and in antidiuretic hormone(ADH)-stimulated frog urinary bladder epithelia. In both tissues, urea permeability (P(urea)) was dramatically but reversibly inhibited by a number of urea analogues, such as 1-(3,4-dichlorophenyl)-2-thiourea (DCPTU). This urea derivative reduced the urea flux in a dose-dependent manner (90% inhibition of P(urea) at 0.5 mM concentration of DCPTU). With the aim of obtaining irreversible markers of red cell and urinary bladder urea transport systems, urea derivatives were modified by addition of an azido residue (N3) and preliminary experiments of photoaffinity labelling were carried out. Two synthetic urea derivatives: 1-(3-azido-4-chlorophenyl)-2-thiourea (ACPTU) and 1-(3-azido-4-chlorophenyl)-3-methyl-2-thiourea (Me-ACPTU) were shown to be very potent inhibitors of P(urea) when used in the absence of light, with IC50 values 60.3 microM and 31.6 microM respectively, as measured in frog urinary bladder. Both these molecules appeared to bind covalently to the urea carrier in both frog urinary bladder and human pink red cell ghosts, when illuminated in the presence of the tissue: the urea flux, which fell to 30-70% of the value obtained in the presence of ADH after inhibitor addition, remained low after the preparation had been illuminated for 30 min and the inhibitor removed. These results provide an interesting approach to the urea carrier analysis, particularly to the urea or urea analogue binding site on the transport protein.
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Affiliation(s)
- S Martial
- Département de Biologie Cellulaire et Moléculaire, Centre d'Etudes de Saclay, Gif-sur-Yvette, France
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11
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Harris HW, Hosselet C, Guay-Woodford L, Zeidel M. Purification and partial characterization of candidate antidiuretic hormone water channel proteins of M(r) 55,000 and 53,000 from toad urinary bladder. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(18)41643-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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12
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Zhang ZH, Solomon AK. Effect of pCMBS on anion transport in human red cell membranes. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1106:31-9. [PMID: 1316163 DOI: 10.1016/0005-2736(92)90218-b] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The kinetics of binding of the mercurial sulfhydryl reagent, pCMBS (p-chloromercuribenzene sulfonate), to the extracellular site(s) at which pCMBS inhibits water and urea transport across the human red cell membrane, have previously been characterized. To determine whether pCMBS binding alters Cl- transport, we measured Cl-/NO3- exchange by fluorescence enhancement, using the dye SPQ (6-methoxy-N-(3-sulfopropyl)quinolinium). An essentially instantaneous extracellular phase of pCMBS inhibition is followed by a much slower intracellular phase, correlated with pCMBS permeation. We attribute the instantaneous phase to competitive inhibition of Cl- binding to band 3 by the pCMBS anion. The ID50 of 2.0 +/- 0.1 mM agrees with other organic sulfonates, but is very much greater than that of pCMBS inhibition of urea and water transport, showing that pCMBS reaction with water and urea transport inhibition sites has no effect on anion exchange. The intracellular inhibition by 1 mM pCMBS (1 h) is apparently non-competitive with Ki = 5.5 +/- 6.3 mM, presumably an allosteric effect of pCMBS binding to an intracellular band 3-related sulfhydryl group. After N-ethylmaleimide (NEM) treatment to block these band 3 sulfhydryl groups, there is apparent non-competitive inhibition with Ki = 2.1 +/- 1.2 mM, which suggests that pCMBS reacts with one of the NEM-insensitive sulfhydryl groups on a protein that links band 3 to the cytoskeleton, perhaps ankyrin or bands 4.1 and 4.2.
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Affiliation(s)
- Z H Zhang
- Biophysical Laboratory, Harvard Medical School, Boston, MA
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13
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Zhang R, Alper SL, Thorens B, Verkman AS. Evidence from oocyte expression that the erythrocyte water channel is distinct from band 3 and the glucose transporter. J Clin Invest 1991; 88:1553-8. [PMID: 1939644 PMCID: PMC295670 DOI: 10.1172/jci115466] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
It has been proposed that the mercurial-sensitive water transporter in mammalian erythrocytes is the anion exchanger band 3 (AE1) and/or the glucose transporter, band 4.5 (GLUT1). Using a functional assay for water channel expression in Xenopus oocytes (Zhang, R., K. A. Logee, and A. S. Verkman. 1990. J. Biol. Chem. 265:15375-15378), we compared osmotic water permeability (Pf) of oocytes injected with water, reticulocyte mRNA, AE1 mRNA, and GLUT1 mRNA. Injection of oocytes with 5-50 ng of in vitro-transcribed AE1 mRNA had no effect on Pf, but increased trans-stimulated 36Cl uptake greater than fourfold in a dinitro-disulfonic stilbene (DNDS)-inhibitable manner. Injection with 1-50 ng of in vitro-transcribed GLUT1 mRNA increased 3H-methylglucose uptake greater than 15-fold in a cytochalasin B-sensitive manner and increased Pf from (3.7 +/- 0.4) x 10(-4) cm/s (SE, n = 16, 10 degrees C) in water-injected oocytes up to (13 +/- 1) x 10(-4) cm/s (n = 18). Both the increments in sugar and water transport were inhibited by cytochalasin B (25 microM) and phloretin (0.2 mM); neither was inhibited by 0.3 mM HgCl2. In oocytes injected with 50 ng of rabbit reticulocyte mRNA, the Pf of (18 +/- 2) x 10(-4) cm/s (n = 18) was reduced to (4.0 +/- 0.6) x 10(-4) cm/s (n = 10) by HgCl2, but was not inhibited by DNDS (0.4 mM), cytochalasin B or phloretin. Coinjection of reticulocyte mRNA with antisense oligodeoxyribonucleotides against AE1 or GLUT1 did not affect Pf, but inhibited completely the incremental uptake of 36Cl or 3H-methylglucose, respectively. Expression of size-fractionated mRNA from reticulocyte gave a 2-2.5-kb size for water channel mRNA, less than the 4-4.5-kb size for the Cl transporter. These results provide evidence that facilitated water transport in erythrocytes is mediated not by bands 3 or 4.5, but by distinct water transport protein(s).
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Affiliation(s)
- R Zhang
- Department of Medicine, University of California, San Francisco 94143-0532
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14
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van Hoek AN, de Jong MD, van Os CH. Effects of dimethylsulfoxide and mercurial sulfhydryl reagents on water and solute permeability of rat kidney brush border membranes. BIOCHIMICA ET BIOPHYSICA ACTA 1990; 1030:203-10. [PMID: 2175653 DOI: 10.1016/0005-2736(90)90296-z] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The effects of dimethylsulfoxide, DMSO, and mercurial sulfhydryl reagents have been studied on water and small solute permeability of rat renal brush border membrane vesicles. Water and solute permeability was measured by mixing membrane vesicles with hypertonic solutions in a stopped-flow apparatus and following osmotically-induced changes in vesicular volume via changes in scattered light intensity. The rate constant of the fast osmotic shrinkage is proportional to the osmotic water permeability, while the rate constant of the slow reswelling phase is proportional to the solute permeability. Using mannitol as the osmotic agent, the osmotic shrinkage of rat renal brush border membrane vesicles followed a biphasic time course. 80% of the vesicles shrunk with a rate constant of approx. 50 s-1 and 20% with a rate constant of approx. 2 s-1. DMSO decreased dose-dependently the amplitude of the fast osmotic shrinkage, without affecting its rate constant. In contrast to DMSO, HgCl2 decreased the rate constant but not the amplitude of the fast osmotic shrinkage of renal brush border vesicles. Between 40-50 microM HgCl2, the inhibition of the fast osmotic shrinkage was completed. DMSO and HgCl2 increase the activation energy of water permeation in renal membranes from 3 to 12-15 kcal/mol. DMSO and HgCl2 did not affect the rate constant of the slow osmotic shrinkage of renal membrane vesicles and were also without effect on osmotic shrinkage of small intestinal brush border and pure phospholipid vesicles. In renal brush border membranes, HgCl2 at low concentrations (less than 10 microM) increased by 15-fold the permeability to NaCl and urea but not to mannitol, an effect which precedes the inhibition of water permeability at higher HgCl2 concentrations. The increase in small solute permeability was irreversible while the inhibition of water permeability could be reversed with cysteine and dithiothreitol. We conclude that water and small solute pathways in rat renal brush border membranes are completely separate entities, which are effected differently by DMSO and HgCl2. These pathways for water and solutes must be membrane proteins since neither DMSO nor HgCl2 affect the permeability properties of pure phospholipid vesicles.
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Affiliation(s)
- A N van Hoek
- Department of Physiology, University of Nijmegen, The Netherlands
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15
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Chao LN, Butterfield DA. The effects of the extracellular manganese concentration and variation of the interpulse delay time in the CPMG sequence on water exchange time across erythrocyte membranes. BIOCHIMICA ET BIOPHYSICA ACTA 1990; 1028:245-50. [PMID: 2223798 DOI: 10.1016/0005-2736(90)90173-l] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
There has been broad disagreement in the literature regarding the dependence of water exchange times (Te) across erythrocyte membranes studied by the 1H-NMR Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence on extracellular Mn2+ concentration. While some workers saw no change in Te with Mn2+, others reported a 35-50% decrease in Te with this extracellular paramagnetic relaxation agent. We present 1H-NMR evidence that a 30-50% change in Te can be produced by interdependence of the interpulse delay time of the CPMG pulse sequence and the external Mn2+ concentration. Such a large dependency is interpreted in terms of the diffusional effect as a major source. However, it is shown experimentally that if a large number of refocusing pi pulses are used, the observed transverse relaxation times are unaffected by Mn2+. Under these conditions excellent agreement of Te obtained in our study (13.0 +/- 0.64 ms (N = 36) at 21 degrees C) and that of 12.8 +/- 3.6 ms at 20-23 degrees C reported by the radiotracer method was found. Our findings suggest new and important implications for evaluating the previous reports of the 1H-NMR CPMG method concerning the [Mn2+] effect in the decrease of Te, and provide conditions where studies of water transport across erythrocyte membranes using this magnetic resonance method can be used with confidence.
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Affiliation(s)
- L N Chao
- Department of Chemistry, University of Kentucky, Lexington 40506-0055
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16
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Kleinzeller A, Booz GW, Mills JW, Ziyadeh FN. pCMBS-induced swelling of dogfish (Squalus acanthias) rectal gland cells: role of the Na+,K(+)-ATPase and the cytoskeleton. BIOCHIMICA ET BIOPHYSICA ACTA 1990; 1025:21-31. [PMID: 2164417 DOI: 10.1016/0005-2736(90)90186-r] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
(1) 0.1-1.0 mM p-chloromercuribenzene sulfonate (pCMBS) and some other organic mercurials produce a swelling of slices of dogfish shark (Squalus acanthias) rectal glands, with an uptake of cell Na+ and a loss of K+. In contrast, 1 mM N-ethylmaleimide (NEM) does not swell rectal gland cells (RGC), while affecting cell cations. (2) The slow entry of [203Hg]pCMBS is linearly related to its external concentration (10 microM-1 mM) and a small accumulation of pCMBS (apparent gradient about 3) in the cells occurs in 2 h. Cell 203Hg rapidly washes out of the cells (fast rate constant 0.153.min-1; slow rate constant 0.0067.min-1), and this efflux is accelerated by 1mM dithiothreitol. Thus, a major portion of pCMBS inter-acts rather loosely with cell components. (3) pCMBS and NEM share: (a) a negligible effect on the efflux of 86Rb+ and of [14C]urea; (b) a gradual inhibition of the cell Na+,K(+)-ATPase activity. (4) NEM as well as agents lowering cell glutathione accelerate and increase the pCMBS-induced cell swelling. Conditions inhibiting the Na+,K(+)-ATPase (ouabain, absence of Na+) have the same effect. (5) pCMBS, but not NEM produce a disappearance of the F-actin-phalloidin fluorescence independent of cell volume changes, particularly at the basolateral RGC membrane. (6) The data are consistent with the following set of events: (a) pCMBS (but not NEM) affects the cell membrane by increasing the efflux of the cell osmolyte taurine (Ziyadeh et al. (1988) Biochim. Biophys. Acta 943, 43-52 and unpublished data); (b) on entry into the cells, pCMBS and NEM interact with cell -SH, including those of the Na+,K(+)-ATPase; this action produces the observed changes in cell cations. Also, pCMBS, but not NEM, decrease F-actin at the membrane; (c) the inhibition of the Na+,K(+)-ATPase activity together with the decreased resistance of the cell membrane to stretch (absence of F-actin) produces the observed pCMBS-induced cell swelling by osmotic forces (intracellular non-diffusible anions).
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Affiliation(s)
- A Kleinzeller
- Department of Physiology, University of Pennsylvania, Philadelphia 19104-6085
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17
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Beavis AD. The mitochondrial inner-membrane anion channel possesses two mercurial-reactive regulatory sites. EUROPEAN JOURNAL OF BIOCHEMISTRY 1989; 185:511-9. [PMID: 2480237 DOI: 10.1111/j.1432-1033.1989.tb15143.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The mitochondrial inner membrane anion channel catalyzes the electrophoretic transport of a wide variety of anions and is inhibited by matrix divalent cations and protons. In this paper, evidence is provided that mersalyl and p-chloromercuribenzene-sulfonate each interact with this uniporter at two distinct sites. Binding to site 1 causes a shift in the pH dependence of transport, characterized by a decrease in the pIC50 for protons from about 7.8 to about 7.3, and leads to substantial stimulation of transport in the physiological pH range. This effect is not reversed by addition of thiols such as thioglycolate. Binding of mersalyl and p-chloromercuribenzenesulfonate to site 2 inhibits the transport of most anions including Pi, citrate, malonate, sulfate and ferrocyanide. The transport of Cl- is inhibited about 60% by mersalyl, but is not inhibited by p-chloromercuribenzenesulfonate. These data suggest that inhibition is a steric effect dependent on the size of the anion and the size of the R group of the mercurial. This inhibition is reversed by thioglycolate. Dose/response curves indicate that mersalyl binds to site 1 as the dose increased from 7 to 13 nmol/mg, whereas it binds to site 2 as the dose is increased from 10 to 18 nmol/mg. Thus, at certain pH values both stimulatory and inhibitory phases can be seen in the same dose/response curve. It is suggested that these sites may contain thiol groups and that physiological regulators may exist which can effect changes in activity of the inner membrane anion uniporter similar to those exerted by mercurials.
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Affiliation(s)
- A D Beavis
- Department of Pharmacology, Medical College of Ohio, Toledo 43699-0008
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18
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Werner PK, Lieberman DM, Reithmeier RA. Accessibility of the N-ethylmaleimide-unreactive sulfhydryl of human erythrocyte Band 3. BIOCHIMICA ET BIOPHYSICA ACTA 1989; 982:309-15. [PMID: 2752032 DOI: 10.1016/0005-2736(89)90071-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The human erythrocyte anion exchange protein, Band 3, was reacted with N-ethylmaleimide (NEM) in cells to a stoichiometry of 5.3 mol NEM per mol Band 3, indicating that all NEM-reactive cysteines in Band 3 were labeled. Quantitatively NEM-blocked Band 3 was still able to bind to and be eluted by reducing agents from a mercurial affinity resin, [p-(chloromercuribenzamido)ethylene]amino-Sepharose. Reaction of NEM-blocked Band 3 with p-chloromercuribenzoate (pCMB) did not prevent binding to the resin due to exchange of pCMB for the immobilized mercurial. pCMB has been reported to inhibit water and urea permeation across the red cell membrane, and this has been attributed to reaction with a NEM-reactive sulfhydryl in Band 3. The interaction of Band 3 with the immobilized ligand directly demonstrates the reaction of NEM-blocked Band 3 with a mercurial and indicates that the NEM-unreactive, pCMB-reactive sulfhydryl residue is accessible to within approximately equal to 12 A (the distance from the solid support to the Hg) of the surface of the solubilized Band 3 protein.
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Affiliation(s)
- P K Werner
- Department of Biochemistry, University of Alberta, Edmonton, Canada
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19
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Passamonti S, Sottocasa GL. The role of sulfhydryl groups in sulfobromophthalein transport in rat liver plasma membrane vesicles. BIOCHIMICA ET BIOPHYSICA ACTA 1989; 979:294-8. [PMID: 2923884 DOI: 10.1016/0005-2736(89)90247-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Sulfobromophthalein (BSP) electrogenic transport activity in a plasma membrane vesicle preparation from rat liver is shown to depend on free sulfhydryl groups. These are organized in two classes, one of which does not react with the sulfhydryl group reagent 5,5'-dithiobis(2-nitrobenzoate). The two classes appear to be involved in BSP transport independently. However, reactivity of one class can be shown to be affected by alkylation of the other. Hence, it is concluded that both classes are located on the same carrier system, which previous research has established to be the integral sinusoidal membrane protein bilitranslocase.
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Affiliation(s)
- S Passamonti
- Dipartimento di Biochimica Biofisica e Chimica delle Macromolecole, Università degli Studi di Trieste, Italy
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20
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Deuticke B. Monocarboxylate transport in red blood cells: kinetics and chemical modification. Methods Enzymol 1989; 173:300-29. [PMID: 2674614 DOI: 10.1016/s0076-6879(89)73020-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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21
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Salhany JM, Sloan RL. Partial covalent labeling with pyridoxal 5'-phosphate induces bis(sulfosuccinimidyl)suberate crosslinking of band 3 protein tetramers in intact human red blood cells. Biochem Biophys Res Commun 1988; 156:1215-22. [PMID: 3190700 DOI: 10.1016/s0006-291x(88)80762-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Partial covalent labeling of band 3 protein lysines with pyridoxal 5'-phosphate (a substrate and affinity probe) changes the bis(sulfosuccinimidyl)suberate crosslinking pattern of band 3 in intact red cells from a mixture of dimers and tetramers to all tetramers as the exclusive crosslinked product. This is the first demonstration of band 3 crosslinkage to the tetrameric level within membranes of intact red cells. The possible implications of the ligand-induced change in the band 3 crosslinking pattern are discussed.
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Affiliation(s)
- J M Salhany
- Veterans Administration Medical Center, Omaha, Nebraska
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22
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Ojcius DM, Toon MR, Solomon AK. Is an intact cytoskeleton required for red cell urea and water transport? BIOCHIMICA ET BIOPHYSICA ACTA 1988; 944:19-28. [PMID: 2843234 DOI: 10.1016/0005-2736(88)90312-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In order to determine the membrane protein(s) responsible for urea and water transport across the human red cell membrane, we planned to reconstitute purified membrane proteins into phosphatidylcholine vesicles. In preparatory experiments, we reconstituted a mixture of all of the red cell integral membrane proteins into phosphatidylcholine vesicles, but found that p-chloromercuribenzenesulfonate (pCMBS), which normally inhibits osmotic water permeability by approximately 90%, has no effect on this preparation. The preparation was also unable to transport urea at the high rates found in red cells, though glucose transport was normal. White ghosts, washed free of hemoglobin and resealed, also did not preserve normal urea and pCMBS-inhibitable water transport. One-step ghosts, prepared in Hepes buffer in a single-step procedure, without washing, retained normal urea and pCMBS-inhibitable water transport. Perturbations of the cytoskeleton in one-step ghosts, by removal of tropomyosin, or by severing the ankyrin link which binds band 3 to spectrin, caused the loss of urea and pCMBS-inhibitable water transport. These experiments suggest that an unperturbed cytoskeleton may be required for normal urea and pCMBS-inhibitable water transport. They also show that the pCMBS inhibition of water transport is dissociable from the water transport process and suggest a linkage between the pCMBS water transport inhibition site and the urea transport protein.
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Affiliation(s)
- D M Ojcius
- Department of Physiology and Biophysics, Harvard Medical School, Boston, MA 02115
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