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Pan X, Giustarini D, Lang F, Rossi R, Wieder T, Köberle M, Ghashghaeinia M. Desipramine induces eryptosis in human erythrocytes, an effect blunted by nitric oxide donor sodium nitroprusside and N-acetyl-L-cysteine but enhanced by Calcium depletion. Cell Cycle 2023; 22:1827-1853. [PMID: 37522842 PMCID: PMC10599211 DOI: 10.1080/15384101.2023.2234177] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 06/29/2023] [Accepted: 06/30/2023] [Indexed: 08/01/2023] Open
Abstract
Background: Desipramine a representative of tricyclic antidepressants (TCAs) promotes recovery of depressed patients by inhibition of reuptake of neurotransmitters serotonin (SER) and norepinephrine (NE) in the presynaptic membrane by directly blocking their respective transporters SERT and NET.Aims: To study the effect of desipramine on programmed erythrocyte death (eryptosis) and explore the underlying mechanisms.Methods: Phosphatidylserine (PS) exposure on the cell surface as marker of cell death was estimated from annexin-V-binding, cell volume from forward scatter in flow cytometry. Hemolysis was determined photometrically, and intracellular glutathione [GSH]i from high performance liquid chromatography.Results: Desipramine dose-dependently significantly enhanced the percentage of annexin-V-binding cells and didn´t impact glutathione (GSH) synthesis. Desipramine-induced eryptosis was significantly reversed by pre-treatment of erythrocytes with either nitric oxide (NO) donor sodium nitroprusside (SNP) or N-acetyl-L-cysteine (NAC). The highest inhibitory effect was obtained by using both inhibitors together. Calcium (Ca2+) depletion aggravated desipramine-induced eryptosis. Changing the order of treatment, i.e. desipramine first followed by inhibitors, could not influence the inhibitory effect of SNP or NAC.Conclusion: Antidepressants-caused intoxication can be treated by SNP and NAC, respectively. B) Patients with chronic hypocalcemia should not be treated with tricyclic anti-depressants or their dose should be noticeably reduced.
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Affiliation(s)
- Xia Pan
- Physiological Institute, Department of Vegetative and Clinical Physiology, Eberhard Karls University of Tübingen, Tübingen, Germany
| | - Daniela Giustarini
- Department of Biotechnology Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Florian Lang
- Physiological Institute, Department of Vegetative and Clinical Physiology, Eberhard Karls University of Tübingen, Tübingen, Germany
| | - Ranieri Rossi
- Department of Biotechnology Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Thomas Wieder
- Physiological Institute, Department of Vegetative and Clinical Physiology, Eberhard Karls University of Tübingen, Tübingen, Germany
| | - Martin Köberle
- Department of Dermatology and Allergology, School of Medicine, Technical University of Munich, München, Germany
| | - Mehrdad Ghashghaeinia
- Physiological Institute, Department of Vegetative and Clinical Physiology, Eberhard Karls University of Tübingen, Tübingen, Germany
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Vagace JM, Rodriguez MÁ, de la Maya MD, Gervasini G. Ethylenediaminetetraacetic acid-dependent pseudomacrocytosis. J Clin Pathol 2013; 66:811-4. [DOI: 10.1136/jclinpath-2013-201545] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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3
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Hg2+ and Cd2+ interact differently with biomimetic erythrocyte membranes. Biometals 2008; 22:261-74. [DOI: 10.1007/s10534-008-9162-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Accepted: 08/29/2008] [Indexed: 11/25/2022]
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Rivas GA, Usobiaga P, González-Rodriguez J. Calcium and temperature regulation of the stability of the human platelet integrin GPIIb/IIIa in solution: an analytical ultracentrifugation study. EUROPEAN BIOPHYSICS JOURNAL : EBJ 1991; 20:287-92. [PMID: 1782910 DOI: 10.1007/bf00450564] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The human platelet integrin GPIIb/IIIa (228 kDa), a Ca-dependent heterodimer formed by the alpha IIb subunit (GPIIb, 136 kDa) and the beta 3 subunit (GPIIIa, 92 kDa), serves as the fibrinogen receptor at the surface of activated platelets. The degree of dissociation of the GPIIb/IIIa heterodimer (s degrees 20*, 8.9 S) into its constituent glycoproteins (GPIIb, 5.8 S; and GPIIIa, 3.9 S) has been assessed by analytical ultracentrifugation in Triton X100 buffers, and its Ca(2+)- and temperature-dependence correlated with Ca(2+)-binding to GPIIb/IIIa and its temperature dependence. At 21 degrees C half-maximal dissociation of GPIIb/IIIa occurs at 5.5 +/- 2.5 x 10(-8) M Ca2+, very close to the dissociation constant of the high affinity Ca-binding site of GPIIb/IIIa (Kd1 8 +/- 3 x 10(-8) M) (Rivas and González-Rodriguez, 1991) and much lower than the Kd of the 3.4 medium affinity Ca-binding sites (Kd2 4 +/- 1.5 x 10(-5) M), which seems to demonstrate that the stability of the heterodimer in solution at room temperature is regulated by the degree of saturation of the high-affinity Ca-binding site. At 4 degrees C, the stability of the heterodimer is apparently Ca(2+)-independent, while at room and physiological temperatures (15-37 degrees C) the degree of dissociation of the heterodimer is regulated by the degree of dissociation of the high- and medium-affinity Ca-binding sites, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- G A Rivas
- Instituto de Química Física, C.S.I.C., Madrid, Spain
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Rivas GA, González-Rodríguez J. Calcium binding to human platelet integrin GPIIb/IIIa and to its constituent glycoproteins. Effects of lipids and temperature. Biochem J 1991; 276 ( Pt 1):35-40. [PMID: 2039481 PMCID: PMC1151139 DOI: 10.1042/bj2760035] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Platelet plasma membrane glycoproteins IIb (GPIIb) and IIIa (GPIIIa) form a Ca(2+)-dependent heterodimer. GPIIb/IIIa, which serves as the receptor for fibrinogen and other adhesive proteins at the surface of activated platelets. Using equilibrium dialysis measurements, it was established that both GPIIb and GPIIIa in solution have low-affinity Ca(2-)-binding sites (Kd0.2-0.3 mM), five in GPIIb and two in GPIIIa, and it was confirmed that only the alpha-chain of GPIIb (GPIIb alpha) binds Ca2+. Furthermore, Ca2+ binding was found with two CNBr fragments of GPIIb, GPIIb alpha-(1-285) and GPIIb alpha-(314-489), which carry three out of the four putative Ca(2+)-binding sites. GPIIb/IIIa in solution has a single high-affinity Ca(2+)-binding site (Kd1 80 +/- 30 nM at 21 degrees C), whose degree of saturation regulates the state of association of GPIIb and GPIIIa in the GPIIb/IIIa heterodimer at room temperature, and 3-4 medium-affinity Ca(2+)-binding sites (Kd2 40 +/- 15 microM at 21 degrees C). When GPIIb/IIIa was incorporated into liposomes, Kd1 decreased by an order of magnitude (9 +/- 3 nM at 21 degrees C) and reached the dissociation constant estimated for the high-affinity Ca(2+)-binding sites at the platelet surface [Brass & Shattil (1982) J. Biol. Chem. 257, 1400-1405], whereas Kd2 remained unchanged. The high-affinity Ca(2+)-binding site of GPIIb/IIIa in solution at 4 degrees C has almost the same affinity (Kd1 65 +/- 20 nM) as at 21 degrees C; however, at 37 degrees C, either its affinity decreases enough so as to become experimentally indistinguishable from the medium-affinity Ca(2+)-binding sites determined at this temperature (number of binding sites 3.9 +/- 1.2 mol of Ca2+/mol of GP, Kd 25 +/- 11 microM), or vanishes altogether. Studies on Ca(2+)-dependent dissociation of GPIIIb/IIIa at 37 degrees C in solution seem to support the former interpretation. Further work will be necessary to decide whether the dissociation of GPIIb/IIIa in the platelet membrane at 37 degrees C is regulated by the degree of saturation of the high-affinity Ca(2+)-binding site, as occurs in solution. It is suggested that the high-affinity Ca(2+)-binding site could be related to the putative GPIIIa-binding region in GPIIb (residues 558-747 of the alpha chain).
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Affiliation(s)
- G A Rivas
- Instituto de Química Física, C.S.I.C., Serrano, Madrid, Spain
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6
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Tatulian SA. Binding of alkaline-earth metal cations and some anions to phosphatidylcholine liposomes. EUROPEAN JOURNAL OF BIOCHEMISTRY 1987; 170:413-20. [PMID: 3691530 DOI: 10.1111/j.1432-1033.1987.tb13715.x] [Citation(s) in RCA: 135] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The dependence of electrophoretic mobility of multilamellar liposomes composed of egg phosphatidylcholine (PtdCho), dimyristoyl-glycerophosphocholine (Myr2Gro-P-Cho) and dipalmitoyl-glycerophosphocholine (Pam2-Gro-P-Cho) on the concentration of several cations and anions has been measured. Values of surface densities of binding sites and intrinsic binding constants of ions to liposome membranes were determined by processing the results in the framework of Gouy-Stern theory. Sharp reductions in the positive surface potential of Myr2Gro-P-Cho and Pam2Gro-P-Cho liposomes have been detected at the thermotropic transition of the lipids from the gel to liquid-crystalline phase. Similar alterations of liposome surface potential were revealed at the temperature of pretransition, as well as at about 50 degrees C, in the case of Pam2Gro-P-Cho. A model is suggested for ion binding to PtdCho membranes, according to which the ion-binding sites are considered as point defects (vacancies) in the structure of lipid head-groups arranged over a trigonal lattice.
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Affiliation(s)
- S A Tatulian
- Institute of Cytology of the Academy of Sciences of the USSR, Leningrad
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Brockerhoff H, Brockerhoff S, Box LL. Mechanism of anesthesia: the potency of four derivatives of octane corresponds to their hydrogen bonding capacity. Lipids 1986; 21:405-8. [PMID: 3736350 DOI: 10.1007/bf02534936] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The anesthetic potency of four derivatives of n-octane was measured by tadpole righting reflex and expressed as effective millimolar concentration of drug in membrane, EDM50. Potency diminished (ED50 increased) in this order: 1-octanol, EDM50 = 5.5; 1-(2-methoxyethoxy)octane, EDM50 = 28; 1-methoxyoctane, EDM50 = 61; and 1-chlorooctane, EDM50 greater than 100. Since the aliphatic chain length was kept constant it is concluded that the differences in anesthetic potency are a consequence of the differences in head group structure. This result is predicted by a theory (Lipids 17, 1001-1003 [1982]) which holds that anesthesia is the result of a drug-induced restructuring of the hydrogen belts, those strata of the membrane that contain the hydrogen bond receiving and donating CO and OH groups of the membrane lipids and the adjoining proteins. The Meyer-Overton rule for anesthetics should be modified: chemicals induce anesthesia at equimolar in-membrane concentration provided their hydrogen-bonding parts are identical.
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Benga G, Holmes RP. Interactions between components in biological membranes and their implications for membrane function. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 1984; 43:195-257. [PMID: 6087406 DOI: 10.1016/0079-6107(84)90014-2] [Citation(s) in RCA: 122] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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9
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Seemann D, Fürstenberger G, Marks F. Effects of the skin mitogens tumor-promotor 12-O-tetradecanoylphorbol 13-acetate and divalent-cation-ionophore A23187 on ion fluxes and membrane potential in a murine epidermal cell line (HEL30) and in 3T3 fibroblasts. EUROPEAN JOURNAL OF BIOCHEMISTRY 1983; 137:485-94. [PMID: 6420151 DOI: 10.1111/j.1432-1033.1983.tb07852.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The transmembrane potential of HEL30 keratinocytes and 3T3 fibroblasts has been determined by measuring the distribution of labelled triphenylmethylphosphonium bromide. The tumor-promotor 12-O-tetradecanoylphorbol 13-acetate (1-5 microM) induces hyperpolarization in 3T3 cells but does not exert any effect on the membrane potential of keratinocytes, whereas the divalent cation ionophore A23187 (0.5 - 1 microM) hyperpolarizes keratinocytes and probably also 3T3 cells. Studies on Na+ and Rb+ fluxes, as well as with different inhibitors, indicate that the hyperpolarizing effect is the consequence of an increased Na+ influx which in turn stimulates the Na+/K+-dependent ATPase. No causal relationship seems to exist between the change of the membrane potential and arachidonic acid release (and subsequent prostaglandin synthesis) which is induced by both drugs in both cell lines. Since the induction of the arachidonic cascade (by both agents) as well as the stimulation of Na+ influx (by A23187) are found to be critically dependent on extracellular Ca2+ and are inhibited by 'Ca2+-blockers', it is concluded that both reactions are triggered by the same event (Ca2+ translocation) but proceed independently of each other. The release of arachidonic acid is already stimulated under conditions where a measurable influx of Ca2+ is not yet observed. This indicates a local mobilization of Ca2+, perhaps across the plasma membrane. It is concluded that monovalent cation fluxes and changes of the membrane potential are not critically involved in the stimulation of the arachidonic acid cascade and cellular proliferation by agents which induce epidermal hyperplasia in vivo.
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Burt JM, Langer GA. Ca2+ displacement by Polymyxin B from sarcolemma isolated by 'gas dissection' from cultured neonatal rat myocardial cells. BIOCHIMICA ET BIOPHYSICA ACTA 1983; 729:44-52. [PMID: 6299348 DOI: 10.1016/0005-2736(83)90454-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Amphiphilic, cationic Polymyxin B is shown to displace Ca2+ from 'gas dissected' cardiac sarcolemma in a dose-dependent, saturable fashion. The Ca2+ displacement is only partially reversible, 57% and 63%, in the presence of 1 mM or 10 mM Ca2+, respectively. Total Ca2+ displaced by a non-specific cationic probe, lanthanum (La3+), at maximal displacing concentration (1 mM) was 0.172 +/- 0.02 nmol/microgram membrane protein. At 0.1 mM, Polymyxin B displaced 42% of the total La3+-displaceable Ca2+ or 0.072 +/- 0.01 nmol/microgram protein. 5 mM Polymyxin displaced Ca2+ in amounts equal to those displaced by 1 mM La3+. Pretreatment of the membranes with neuraminidase (removal of sialic acid) and protease leads to a decrease in La3+-displaceable Ca2+ but to an increase in the fraction displaced by 0.1 mM Polymyxin from 42% to 54%. Phospholipase D (cabbage) treatment significantly increased the La3+-displaceable Ca2+ to 0.227 +/- 0.02 nmol/microgram protein (P less than 0.05), a gain of 0.055 nmol. All of this phospholipid specific increment in bound Ca2+ was displaced by 0.1 mM Polymyxin B. The results suggest that Polymyxin B will be useful as a probe for phospholipid Ca2+-binding sites in natural membranes.
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Abstract
A wide range of abnormalities of membrane sodium and potassium transport can be demonstrated in patients with essential hypertension, and in rats with genetic hypertension and with some forms of experimental hypertension. In the human red cell increased permeability to sodium and potassium, increased ouabain-sensitive sodium pumping, lithium-sodium counter-transport, and frusemide-sensitive co-transport have been described; by contrast, in the human leucocyte sodium pumping is reduced. In the spontaneously hypertensive rat and the rat with mineralocorticoid-induced hypertension, increased permeability to sodium and potassium, with increased ouabain-sensitive pumping, is shared by the red cell and the arterial smooth muscle. This abnormality is associated with decreased cell-membrane affinity for calcium and increased cell-membrane viscosity. It is proposed that in essential hypertension the decreased membrane affinity for calcium is a primary pathogenetic change giving rise to secondary changes in sodium and potassium transport.
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12
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Adam G. Lattice theory of Ca2+-binding to laterally mobile negatively charged surface sites with application to biological membranes. Colloid Polym Sci 1982. [DOI: 10.1007/bf01465431] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Moore RB, Manery JF. Resealing to small solutes of white erythrocyte membranes after incubation with EDTA, Ca2+, salt, sucrose, phospholipase C. Arch Biochem Biophys 1981; 211:179-91. [PMID: 6795994 DOI: 10.1016/0003-9861(81)90443-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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14
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Abstract
The calcium flux of erythrocytes from patients with Duchenne muscular dystrophy (DMD) was measured. Passive influx was determined using erythrocytes incubated with lanthanum chloride as a specific inhibitor to calcium transport. There was no significant difference in calcium influx into cytosol and into membrane fractions between DMD and control age-matched boys. Influx of calcium was also determined using ATP-depleted erythrocytes incubated without the inhibitor. Again there was no significant difference between DMD and control values. Efflux of calcium was measured using erythrocytes loaded with calcium ionophore A23187. Calcium efflux speed was related to intracellular calcium concentration and the efflux reached a plateau at about 1 mM. There was no significant difference in calcium efflux rate as a function of intracellular calcium concentration between DMD and control.
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Ong CN, Lee WR. Interaction of calcium and lead in human erythrocytes. BRITISH JOURNAL OF INDUSTRIAL MEDICINE 1980; 37:70-7. [PMID: 7370195 PMCID: PMC1008647 DOI: 10.1136/oem.37.1.70] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The interactions of calcium and lead on the human erythrocytes have been studied in vitro using 45Ca and 203Pb as tracers. The chemical groups binding calcium and lead on the erythrocytes were also investigated. Calcium ions in the plasma were shown to be capable of replacing the 203Pb on the red cells. More than 85% of the 203Pb in the erythrocyte was associated with the cytoplasmic components, and the rest was bound to the stromal membrane. About 90% of 45Ca was attached to erythrocyte membrane. Extraction of 45Ca and 203Pb-labelled erythrocyte membranes with chloroform/methanol mixture showed that the distribution patterns of these two nuclides are similar, with over 88% protein bound, less than 10% lipid bound, and traces in the aqueous phase. Chemical modification of erythrocyte membrane proteins with carbodi-imide, p-chloromercuribenzoate (PCMB), and maleic anhydride suggested that the carboxyl groups are responsible for binding lead and calcium to the red cell membrane. The SH groups may have a minor role in the binding for both cations. Amino groups did not appear to affect the binding of these cations. Gel chromatography of 45Ca-labelled erythrocyte membrane indicated that Ca++ bound to the same fraction of membrane proteins as 203Pb, corresponding to a molecular weight of about 130 000 to 230 000. A possible implication of these findings is that lead and calcium may compete for the same binding site(s) on the erythrocyte.
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Impraim CC, Micklem KJ, Pasternak CA. Calcium, cells and virus--alterations caused by paramyxoviruses. Biochem Pharmacol 1979; 28:1963-9. [PMID: 222290 DOI: 10.1016/0006-2952(79)90652-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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17
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Akhtar RA, Perry MC. Insulin action in isolated fat cells. I. Effects of divalent cations on the stimulation by insulin of glucose uptake. Biochim Biophys Acta Gen Subj 1979; 585:107-16. [PMID: 109129 DOI: 10.1016/0304-4165(79)90330-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The effects of divalent cations, in particular Ca2+ and Mg2+, on glucose uptake by rat isolated fat cells in the presence and absence of insulin have been studied. EDTA (disodium salt) was used to deplete the bovine serum albumin present in the incubation medium of endogenous divalent cations prior to incubation with the cells, but was not present in the incubation medium during the incubation of the cells. The removal of Ca2+ and Mg2+ from the incubation medium did not affect the basal glucose uptake, but abolished the ability of insulin to stimulate glucose uptake by the cells. Addition of 25 microM MgCl2 or CaCl2 to the incubation medium restored a significant insulin stimulation, and this stimulation was maximal when 0.1 mM MgCl2 or CaCl2 had been added. SrCl2 and BaCl2 were also effective in restoring the insulin stimulation, but did not substitute fully for Ca2+ and Mg2+ in the incubation medium. Possible explanation for these observations are discussed.
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Low PS, Lloyd DH, Stein TM, Rogers JA. Calcium displacement by local anesthetics. Dependence on pH and anesthetic charge. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(18)50705-5] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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19
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Postnov YV, Orlov SN, Pokudin NI. Decrease of calcium binding by the red blood cell membrane in spontaneously hypertensive rats and in essential hypertension. Pflugers Arch 1979; 379:191-5. [PMID: 571115 DOI: 10.1007/bf00586947] [Citation(s) in RCA: 108] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Ca binding in the red blood cell (RBC) membrane of spontaneously hypertensive rats (SHR) and of patients with essential hypertension was studied. Under conditions of physiological concentration of free Ca in the incubation medium of RBC the outer part of the membrane binds 393 +/- 32 and 435 +/- 30 nmole of Ca per ml of RBC in rats and humans, respectively, without essential differences in the amount of Ca in hypertensive individuals as compared to the normotensive controls. The membrane of red blood cell ghosts (RBCgh) at concentrations of free Ca corresponding to its intracellular concentration binds 4.28 +/- 0.39 and 3.53 +/- 0.15 nmole of Ca per mg of protein of RBCgh in rats and humans, respectively. This part of membrane-bound Ca pool (most probably related to the inner part of the red blood cell membrane) is reduced by 48% in SHR and by 28% in patients with essential hypertension as compared to normotensive controls. It is suggested that the decrease of Ca binding ability of the RBC membrane in both types of hypertension studied may be a pattern of a more widespread cell membrane defect.
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Low PS. Specific cation modulation of anion transport across the human erythrocyte membrane. BIOCHIMICA ET BIOPHYSICA ACTA 1978; 514:264-73. [PMID: 32903 DOI: 10.1016/0005-2736(78)90297-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Steinberg MH, Eaton JW, Berger E, Coleman MB, Oelshlegel FJ. Erythrocyte calcium abnormalities and the clinical severity of sickling disorders. Br J Haematol 1978; 40:533-39. [PMID: 728370 DOI: 10.1111/j.1365-2141.1978.tb05829.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We studied erythrocyte calcium levels and uptake in a group of patients with sickle haemoglobinopathies of different clinical severity in an attempt to relate these measurements to the production of irreversibly sickled cells and disease severity. Erythrocyte calcium levels were measured by atomic absorption spectroscopy and calcium uptake by isotopic means. In sickle cell anaemia, erythrocyte calcium content was elevated and the uptake of isotopic calcium increased under both oxygenated and deoxygenated conditions. There was a direct correlation between the numbers of irreversibly sickled cells and calcium uptake and an inverse relationship between calcium uptake and red cell potassium level. The clinical course of disease was milder in patients with high fetal haemoglobin levels, but there was no relationship between clinical course and calcium levels, calcium flux or irreversibly sickled cells. Our observations suggest that calcium accumulation and irreversibly sickled cell formation are related processes. The absence of good correlation between various biochemical and clinical parameters emphasizes the complexity of factors which modify the clinical course of this disorder.
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Gradual increase in the electrical excitability of crayfish slow muscle fibers produced by anoxia or uncouplers of oxidative phosphorylation. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 1978. [DOI: 10.1007/bf00656867] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Lin GS, Macey RI. Shape and stability changes in human erythrocyte membranes induced by metal cations. BIOCHIMICA ET BIOPHYSICA ACTA 1978; 512:270-83. [PMID: 708726 DOI: 10.1016/0005-2736(78)90252-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Asymmetric human erythrocyte ghost membranes behave as bilayer couple and exhibit a radius of curvature preference depending on the state of expansion or contraction of each side of the bilayer. The inside-out preference in the absence of added metal cations is gradually reduced as the K+ concentration is raised to 200 mM until a slight right-side-out preference may be exhibited Divalent cations (denoted 72+; Ca2+, Mg2+ and Mn2+) induce inside-out curvature at very low concentrations, right-side-out curvature at intermediate concentrations, and inside-out curvature again at high ones. This "triphasic" response is attributed to changes in the packing of acidic phospholipid (PL-) pairs in the A-face as a function of M2+ : PL- binding stoichiometry: 0 : 1 (PL- electrostatic repulsion and A-face expansion), 1 : 2 (PL2M crossbridging an contraction), and 1 : 1 (PLM+ repulsion and expansion). Generally increasing parent vesicle size is associated with higher cation concentrations. This is distinguished from the internal and external membrane blebbing preferred at different concentrations in accord with sidedness preference. Parent vesicle size was interpreted to be most closely associated with cation stabilisation (resistance to fragmentation) of the membrane, while sidedness and size (radius of curvature) of blebs were most closely correlated with packing of lipid molecules in the bilayer.
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24
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Porzig H, Stoffel D. Equilibrium binding of calcium to fragmented human red cell membranes and its relation to calcium-mediated effects on cation permeability. J Membr Biol 1978; 40:117-42. [PMID: 26806 DOI: 10.1007/bf01871144] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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25
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Brauer E, Kupka KD, Wiese A. Ca-Ionen-Einfluß auf die Erythrozytmembransubstanzen Spektrin und n-Acetyl-Neuraminsäure. Z PHYS CHEM 1978. [DOI: 10.1524/zpch.1978.113.2.151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Szász I, Sarkadi B, Gárdos G. Mechanism of Ca2+-dependent selective rapid K+-transport induced by propranolol in red cells. J Membr Biol 1977; 35:75-93. [PMID: 886606 DOI: 10.1007/bf01869941] [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: 12/24/2022]
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Baker RF, Powars D, Haywood LJ. Restriction of calcium uptake in normal and sickle red cells by procaine hydrochloride and P-aminobenzoic acid. Biochem Biophys Res Commun 1977; 75:381-8. [PMID: 300625 DOI: 10.1016/0006-291x(77)91053-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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28
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Abstract
The implications of a double polar-nonpolar-polar leaflet construction of the plasma membrane are investigated. Experimental data from transmission electron microscopic and enzymologic characterization of plasma membranes are advantageously interpreted in these terms compared to interpretation in terms of lipid bilayer. X-ray diffraction and electron spin resonance studies do not differentiate between the present and previous models for the structure of plasma membranes but electron spin resonance data that fail to indicate a statistical distribution of spin labels also fail to support the fluid mosaic model for cell membranes. Results from experiments involving vectorial digestion and labelling of plasma membranes as well as freeze fracture electron microscopic data are compatible with the present model. The molecular composition of the human erythrocyte membrane is investigated whereby the band III protein and glycophorin are suggested to be the structural proteins of the outer leaflet and the spectrins those of the inner leaflet.
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Affiliation(s)
- E Cervén
- Institute of Medical and Physiological Chemistry, Biomedical Center, University of Uppsala, Uppsala, Sweden
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29
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Behn C, Lübbemeier A, Weskamp P. Chlorotetracycline induces calcium mediated shape changes in human erythrocytes. Is Ca asymmetrically distributed in the red cell membrane? Pflugers Arch 1977; 372:259-68. [PMID: 564049 DOI: 10.1007/bf01063861] [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: 12/23/2022]
Abstract
Calcium was localized in the red cell membrane by light microscopy using chlorotetracycline hydrochloride (CTC) as chelate probe. Treating human erythrocytes with CTC dissolved in saline free of divalent cations, leads to a 530 nm fluorescence emission in the cell border and to characteristic cell shape changes which were evaluated to assess intramembrane calcium distribution. CTC prevented and reverted erythrocyte crenation induced either by washing or superfusing the cells with saline. The ionophore A23187, EGTA and glucose depletion depressed the shape modifying effect of CTC. Thus, CTC appears to act on red cell shape by complex formation with membrane associated calcium. This is further confirmed by the failure of degraded CTC, devoid of metal binding capacity, to modify the crenated shape. The CTC effect can be reverted by superfusing the erythrocytes with CTC-free medium. Thus, calcium binds more tightly to the membrane than to CTC and is not displaced by the antibiotic. If the bilayer couple hypothesis [Sheetz, M.P., Singer, S.J., Proc. Natl. Acad. Sci. USA 71, 4457-4461 (1974)]applies, crenation is reverted by expansion of the inner membrane half relative to the outer membrane half. Expansion of the inner membrane half results from intercalation of CTC which binds to calcium. Thus, calcium in the red cell membrane preferentially occupies the inner leaflet of the bilayer.
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30
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Solomon AK, Cohen CM. Ca binding to the human red cell membrane: characterization of membrane preparations and binding sites. J Membr Biol 1976; 29:345-72. [PMID: 11349 DOI: 10.1007/bf01868970] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Inside out and right side out vesicles were used to study the sidedness of Ca binding to the human red cell membrane. It was shown that these vesicles exhibited only a limited permeability to Ca, enabling the independent characterization of Ca binding to the extracellular and cytoplasmic membrane surfaces...
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31
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Abstract
The permeability of red cell ghosts to K is determined by the amount of membrane-bound Mg which, in turn, depends on internal Mg. Contrasting with such effect, an increase in cellular Ca raises K permeability. To test whether this action is due to a competitive displacement of membrane Mg, the free Ca content of human red cell ghosts was altered by means of Ca-EGTA buffers. Net Na and K movements as well as Ca and Mg bindings were assessed after incubation in a Na-medium at 37 degrees C. Raising Ca from 3 X 10(-7) to 1 X 10(-2) M caused a large K efflux with very little Na gain. Under similar conditions, Ca binding was increased without affecting membrane-bound Mg. Both Ca binding and K loss were markedly diminished by either adding ATP to the hemolytic medium or increasing internal Mg at a fixed Ca concentration. A Scatchard analysis showed three Ca binding sites, two of them having high affinity. It is concluded that Ca action does not arise from a displacement of membrane-bound Mg but from binding to different sites in the membrane. Presumably, high affinity sites are involved in the control of K permeability.
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32
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Raz A, Goldman R. Effects of local anaesthetics on intracellular fusion processes. Enhancement of concanavalin A-induced macrophage vacuolation. BIOCHIMICA ET BIOPHYSICA ACTA 1976; 455:226-40. [PMID: 990327 DOI: 10.1016/0005-2736(76)90166-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The extensive vacuolation elecited in mouse peritoneal macrophages in response to interaction with concanavalin A is markedly enhanced by a simultaneous exposure to anaesthetics. The potency of enchancing vacuolation increases within the series of normal alcohols with chain length C10 greater than C8 greater than C7 greater than C6. From the four tertiary amine local anaesthetics tested lidocaine and procaine are by far more effective than tetracaine and dibucaine. The latter two induce extensive cell shrinkage at concentrations at which the first two exhibit optimum enhancing capacity. Of the tested compounds chlorpromazine has the highest membrane/buffer partition coefficient and it exhibits its optimum enhancing effect on concanavalin A-induced macrophage vacuolation at the lowest drug concentration. The binding of [3H] concanavalin A as well as its internalization by macrophages incubated with the lectin for 15, 45 and 90 min are not affected significantly in the presence of decanol, procaine or chlorpromazine at concentrations of maximum enhancing effect on vacuolation. Thus enhancement of vacuolation does not stem from an increase in the rate or extent of concanavalin A interiorization. The rate at which vacuoles are generated is however markedly increased in the presence of chlorpromazine and the resulting vacuoles are of a larger diameter. At 2-5 fold the concentration required for inhibition of maximum enhancing effect, the drugs lead to extensive macrophage shrinkage and to depletion of intracellular ATP. Phagocytosis of heat-killed yeast cells is reduced by tertiary amine anaesthetics at concentrations optimal for enhancement of concanavalin A-induced vacuolation. Enhanced intracellular fusion of concanavalin A-bearing pinosomes to form vacuoles is discussed in terms of current ideas on factors vacuoles is discussed in terms of current ideas on factors vacuoles is discussed in terms of current ideas on factors affecting membrane fusion and the effects of anaesthetics on membrane organization of lipids, intramembraneous particles, glycoprotein receptors and the possible control by cytoskeletal elements. The results best fit the hypothesis that enhanced fusion correlates with membrane aggregation of both intramembraneous particles and concanavalin A receptor and the formation of areas relatively deplete of these structures and enriched in phospholipids.
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33
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Abstract
1. Ca buffers may be introduced into human red cells by reversible haemolysis. The resealed ghosts retain Ca and chelating anions in the same ratio as in the haemolysing solution, enabling the intracellular Ca2+ concentration to be calculated simply. 2. The passive permeability of the ghosts to Na and Cl is unaffected by intracellular Ca2+ concentrations in the 10(-8)-10(-4) M range, whereas the K permeability is greatly increased at concentrations above 10(-7) M. 3. These preparations enable Ca-dependent K movements to be studied under stable conditions. When the ghosts contain about 5 X 10(-6) M-Ca2+, over 96% of K transport occurs via the Ca-sensitive route.
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34
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Lassen UV, Pape L, Vestergaard-Bogind B. Effect of calcium on the membrane potential of Amphiuma red cells. J Membr Biol 1976; 26:51-70. [PMID: 3652 DOI: 10.1007/bf01868866] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An increase in extracellular Ca concentration causes the membrane of giant red cells of the salamander, Amphiuma means, to undergo a marked, transient hyperpolarization. This hyperpolarization is caused by an increase in K permeability of the membrane as judged from the K sensitivity of the membrane potential and from the rate of K loss under influence of raised extracellular Ca concentration. At constant external pH, the induction of hyperpolarization by increased extracellular Ca has a relatively well-defined threshold concentration. Furthermore the phenomenon is of an "all or none" type with most of the cells having membrane potential values either in the normal range (about -15 mV) or in the range -40 to -70mV. Shortly after suspension in Ringer's with 15 mm Ca, most if not all of the individual cells are hyperpolarized. Upon continued exposure (5-20 min) to the higher Ca concentration the membrane potential returns to the normal value in a fashion compatible with an "all or none" response. The observed Ca effect is sensitive to the pH of the suspending medium. At pH 6.2 the response is absent whereas the hyperpolarization is markedly stronger at pH 8.2 than at PH 7.2. It is argued that a reliable transport number for K under influence of Ca cannot be estimated from the slope of membrane potential vs. log (extracellular K concentration). This is probably related to the fact that the membrane potentials of the cells in the population do not stay constant in time. The above phenomenon is compared with the Ca-induced K permeability in poisoned human red cells or red cell ghosts. It is important to note that the cells employed in the present study are neither poisoned nor mechanically disrupted. This study emphasizes that the role of Ca in regulating cell membrane permeability to K seems to be a general feature.
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35
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Geyer G, Linss W. Inverse localization of Ca2+ and La3+ high affinity binding sites of the red cell membrane. EXPERIMENTELLE PATHOLOGIE 1976; 12:214-7. [PMID: 991969 DOI: 10.1016/s0014-4908(76)80045-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Glutaraldehyde fixation in the presence of both 90 mM La3+ resulted in opaque deposits were also seen in specimens fixed in a glutaraldehyde-CaCl2 medium devoid of La3+. In that case only small amounts of a moderately opaque substance had accumulated or remained at the external surface of the erythrocyte membrane. Specimens previously fixed with Ca2+, La3+ supplemented glutaraldehyde lost their internal deposits completely during postifixation with OsO4. The findings provide evidence of Ca2+ high affinity binding sites at the internal surface of the erythrocyte membrane presumably identical with the filamentous matrix. Glycocalyx constituents are considered external Ca2+ low affinity binding sites, however, capable of accumulating high amounts of La3+ during glutaraldehyde fixation.
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36
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Abstract
Calcium binding sites of human red blood cells were localized by means of a method according to OSCHMAN and WALL (1972). The procedure resulted in multiple opaque deposits at the inner surface of the erythrocyte membrane.
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37
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Keeler JD, Sharma RP. Rabbit erythrocyte membrane interaction with promazine and calcium. Biochem Pharmacol 1975; 24:2207-11. [PMID: 2177 DOI: 10.1016/0006-2952(75)90053-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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38
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Clemente F, Meldolesi J. Calcium and pancreatic secretion-dynamics of subcellur calcium pools in resting and stimulated acinar cells. Br J Pharmacol 1975; 55:369-79. [PMID: 1203623 PMCID: PMC1666690 DOI: 10.1111/j.1476-5381.1975.tb06940.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
1 Pulse-chase experiments were carried out on pancreatic tissue lobules incubated in vitro, with 45Ca as the tracer, in order to shed some light on the functional significance of the calcium pools associated with the various cell organelles of the acinar cell, especially in relation to stimulus-secretion coupling. 2 The kinetics of tracer uptake and release which were observed in the intact lobules suggest the existence of a number of intracellular pools, whose rate of exchange is slower than that across teh plasmalemma. 3 The various subcellular fractions accumulate the tracer in different amounts: some (rough microsomes and postmicrosomal supernatant) showed little radioactivity and some (smooth microsomes and zymogen granule membranes) were heavily labelled; mitochondria and zymogen granules showed intermediate values. 4 The fractions are heterogeneous also in relation to the time course of uptake and release of the tracer: in rough and smooth microsomes and, especially, in the postmicrosomal supernatant both rates were fast; zymogen granules and zymogen granule membranes showed slow rates of uptake and little release during chase; intermediate rates were found in mitochondria. 5 In agreement with previous findings we observed that in 45Ca preloaded lobules, stimulation of secretion (brought about by the secretagogue polypeptide caerulein) results in an increase of the tracer release which seems to be due primarily to the rise of the intracellular concentration of free Ca2+ and to the consequent increase of the transmembrane Ca2+ efflux. Among the cell fractions isolated from stimulated lobules only the mitochondria exhibited a significantly lower 45Ca level relative to the unstimulated controls. 6 It is concluded that, of the organelle-bound calcium pools, that associated with the mitochondria might be involved in the regulation of the calcium-dependent functions, including stimulus-secretion coupling; the calcium associated with the zymogen granule content probably has a role in the architecture of the organelle and in the functionality of the pancreatic juice, while the calcium bound to the membrane of the granules might be concerned with the regulation of its permeability properties.
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39
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Clausen T, Elbrink J, Dahl-Hansen AB. The relationship between the transport of glucose and cations across cell membranes in isolated tissues. IX. The role of cellular calcium in the activation of the glucose transport system in rat soleus muscle. BIOCHIMICA ET BIOPHYSICA ACTA 1975; 375:292-308. [PMID: 1125213 DOI: 10.1016/0005-2736(75)90197-2] [Citation(s) in RCA: 82] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
1. The role of cellular Ca2+ in the transport of glucose has been investigated by determining the time-course of tension development and the release of 45Ca and 3-0-[14C]methylglucose from preloaded rat soleus muscles. 2. Electrical stimulation, 2,4-dinitrophenol (0.05 mM) and hyperosmolarity (200 mM mannitol) were all found to induce a rapid rise in tension and the rate coefficient of 45Ca release, which coincided with an acceleration of 3-0-[14C]methylglucose efflux. 3. Caffeine (10 mM) or exposure to K+ -substituted buffer induced a rapid increase in tension and the release of 45Ca, but a much later stimulation of 3-0-methylglucose efflux. This delayed response may be related to the fact that both factors induce a pronounced suppression of the effect of various agents known to stimulate sugar transport.4. Following a washout period of 120 min at 0 degreesC, the return to 30 degrees C elicited a prompt transient rise in the rate coefficient for the release of 45Ca and 3-0-[14C]meth ylglucose to levels, respectively, 2.8 and 14.6 times the control levels measured at 30 degrees C. The magnitude of these peaks appeared to be a function of the duration of the exposure to 0 degrees C. Cooling also led to a stimulation of the uptake of 3-0-[14C]methylglucose, and phlorizin suppressed the rise. 5. It was not possible to detect any significant effect of insulin on basal tension or on the influx or efflux of 45Ca. However, in a hyperosmolar environment, insulin (10-100 munits/ml) induced a marked further rise in tension, indicating that the hormone can elicit a redistribution of cellular Ca2+. 6. It is concluded that a rise in the cytoplasmic concentration of free Ca2+ constitutes a part of the mechanism by which the glucose transport system is activated by a variety of stimuli, perhaps also insulin.
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40
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Interaction of Ions with Monolayers. ACTA ACUST UNITED AC 1975. [DOI: 10.1016/b978-0-12-571809-7.50009-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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41
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Active Calcium Transport and Ca2+-Activated ATPase in Human Red Cells. CURRENT TOPICS IN MEMBRANES AND TRANSPORT 1975. [DOI: 10.1016/s0070-2161(08)60103-3] [Citation(s) in RCA: 93] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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42
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Steiner M, Tateishi T. Distribution and transport of calcium in human platelets. BIOCHIMICA ET BIOPHYSICA ACTA 1974; 367:232-46. [PMID: 4425666 DOI: 10.1016/0005-2736(74)90046-7] [Citation(s) in RCA: 28] [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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43
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Moroff G, Poster J, Oster G. Enhancement of the copper-induced hemolysis by progesterone. JOURNAL OF STEROID BIOCHEMISTRY 1974; 5:601-6. [PMID: 4427458 DOI: 10.1016/0022-4731(74)90112-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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44
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Chambaut AM, Leray-Pecker F, Feldmann G, Hanoune J. Calcium-binding properties and ATPase activities of rat liver plasma membranes. J Gen Physiol 1974; 64:104-26. [PMID: 4276192 PMCID: PMC2226148 DOI: 10.1085/jgp.64.1.104] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Plasma membranes from rat liver purified according to the procedure of Neville bind calcium ions by a concentration-dependent, saturable process with at least two classes of binding sites. The higher affinity sites bind 45 nmol calcium/mg membrane protein with a K(D) of 3 microM. Adrenalectomy increases the number of the higher affinity sites and the corresponding K(D). Plasma membranes exhibit a (Na(+)-K(+))-independent-Mg(2+)-ATPase activity which is not activated by calcium between 0.1 microM and 10 mM CaCl(2). Calcium can, with less efficiency, substitute for magnesium as a cofactor for the (Na(+)-K(+))-independent ATPase. Both Mg(2+)- and Ca(2+)-ATPase activities are identical with respect to pH dependence, nucleotide specificity and sensitivity to inhibitors. But when calcium is substituted for magnesium, there is no detectable membrane phosphorylation from [gamma-(32)P] ATP as it is found in the presence of magnesium. The existence of high affinity binding sites for calcium in liver plasma membranes is compatible with a regulatory role of this ion in membrane enzymic mechanisms or in hormone actions. Plasma membranes obtained by the procedure of Neville are devoid of any Ca(2+)-activated-Mg(2+)-ATPase activity indicating the absence of the classical energy-dependent calcium ion transport. These results would suggest that the overall calcium-extruding activity of the liver cell is mediated by a mechanism involving no direct ATP hydrolysis at the membrane level.
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45
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Ter-Minassiansaraga L, Abitboul S. Spread monolayer of a hydrophobic polyacid. I. Surface pressure and calcium binding by ion exchange. J Colloid Interface Sci 1974. [DOI: 10.1016/0021-9797(74)90326-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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46
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Olson EJ, Cazort RJ. Investigation of the accompaniment of calcium during active calcium transport from human erythrocyte ghosts. J Gen Physiol 1974; 63:590-600. [PMID: 4363379 PMCID: PMC2203563 DOI: 10.1085/jgp.63.5.590] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
To determine whether a cell metabolite was involved in active calcium transport, the cell contents of human erythrocytes were subjected to high dilutions and the resultant ghosts were checked for their ability to actively transport calcium. It was found that the diluted erythrocyte ghosts did retain their capacity to actively transport calcium and that the characteristics of this transport process appeared to be unaltered by the high dilutions. Calcium analysis of the cell membrane and cell supernatant indicated that almost all of the calcium was lost from the cell solution rather than the cell membrane as active calcium transport proceeded. Therefore it appeared that calcium was able to cross the cell membrane without the aid of a cell metabolite. Investigations with layered erythrocytes indicated that the active transport of calcium was not assisted by centrifugation. Neither inorganic phosphate, pyrophosphate, nor an adenine nucleotide appeared to accompany calcium across the membrane as indicated by total phosphate and inorganic phosphate analysis and 260-nm readings of the deproteinized supernatant.
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47
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48
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Duffy MJ, Schwarz V. Calcium binding by the erythrocyte membrane. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 330:294-301. [PMID: 4772285 DOI: 10.1016/0005-2736(73)90234-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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49
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Toury R. [Study of low-affinity Ca2+ binding by rat liver inner and outer mitochondrial membrane and rough and smooth endoplasmic reticulum]. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 307:607-12. [PMID: 4718808 DOI: 10.1016/0005-2736(73)90305-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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50
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Horvath C, Sovak M. Membrane coarctation by calcium as a regulator for bound enzymes. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 298:850-60. [PMID: 4729819 DOI: 10.1016/0005-2736(73)90389-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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