1
|
Bloch DN, Sandre M, Ben Zichri S, Masato A, Kolusheva S, Bubacco L, Jelinek R. Scavenging neurotoxic aldehydes using lysine carbon dots. NANOSCALE ADVANCES 2023; 5:1356-1367. [PMID: 36866263 PMCID: PMC9972859 DOI: 10.1039/d2na00804a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
Reactive aldehydes generated in cells and tissues are associated with adverse physiological effects. Dihydroxyphenylacetaldehyde (DOPAL), the biogenic aldehyde enzymatically produced from dopamine, is cytotoxic, generates reactive oxygen species, and triggers aggregation of proteins such as α-synuclein implicated in Parkinson's disease. Here, we demonstrate that carbon dots (C-dots) prepared from lysine as the carbonaceous precursor bind DOPAL molecules through interactions between the aldehyde units and amine residues on the C-dot surface. A set of biophysical and in vitro experiments attests to attenuation of the adverse biological activity of DOPAL. In particular, we show that the lysine-C-dots inhibit DOPAL-induced α-synuclein oligomerization and cytotoxicity. This work underlines the potential of lysine-C-dots as an effective therapeutic vehicle for aldehyde scavenging.
Collapse
Affiliation(s)
- Daniel Nir Bloch
- Department of Chemistry, Ben Gurion University of the Negev Israel
| | - Michele Sandre
- Department of Neuroscience, University of Padova Italy
- Centro Studi per la Neurodegenerazione (CESNE), University of Padova Italy
| | - Shani Ben Zichri
- Department of Chemistry, Ben Gurion University of the Negev Israel
| | - Anna Masato
- Centro Studi per la Neurodegenerazione (CESNE), University of Padova Italy
- Department of Biology, University of Padova Italy
| | - Sofiya Kolusheva
- Ilse Katz Institute for Nanoscale Science and Technology (IKI), Ben Gurion University of the Negev Israel
| | - Luigi Bubacco
- Centro Studi per la Neurodegenerazione (CESNE), University of Padova Italy
- Department of Biology, University of Padova Italy
| | - Raz Jelinek
- Department of Chemistry, Ben Gurion University of the Negev Israel
- Ilse Katz Institute for Nanoscale Science and Technology (IKI), Ben Gurion University of the Negev Israel
| |
Collapse
|
2
|
Martínez-Vieyra V, Rodríguez-Varela M, García-Rubio D, De la Mora-Mojica B, Méndez-Méndez J, Durán-Álvarez C, Cerecedo D. Alterations to plasma membrane lipid contents affect the biophysical properties of erythrocytes from individuals with hypertension. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:182996. [PMID: 31150634 DOI: 10.1016/j.bbamem.2019.05.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 05/15/2019] [Accepted: 05/23/2019] [Indexed: 12/17/2022]
Abstract
Genetic and environmental factors may contribute to high blood pressure, which is termed essential hypertension. Hypertension is a major independent risk factor for cardiovascular disease, stroke and renal failure; thus, elucidation of the etiopathology of hypertension merits further research. We recently reported that the platelets and neutrophils of patients with hypertension exhibit altered biophysical characteristics. In the present study, we assessed whether the major structural elements of erythrocyte plasma membranes are altered in individuals with hypertension. We compared the phospholipid (phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, sphingosine) and cholesterol contents of erythrocytes from individuals with hypertension (HTN) and healthy individuals (HI) using LC/MS-MS. HTN erythrocytes contained higher phosphatidylcholine, phosphatidylethanolamine and phosphatidylserine contents and a lower cholesterol content than HI erythrocytes. Furthermore, atomic force microscopy revealed important morphological changes in HTN erythrocytes, which reflected the increased membrane fragility and fluidity and higher levels of oxidative stress observed in HTN erythrocytes using spectrophotofluorometry, flow cytometry and spectrometry. This study reveals that alterations to the lipid contents of erythrocyte plasma membranes occur in hypertension, and these alterations in lipid composition result in morphological and physiological abnormalities that modify the dynamic properties of erythrocytes and contribute to the pathophysiology of hypertension.
Collapse
Affiliation(s)
- Vette Martínez-Vieyra
- Laboratorio de Hematobiología, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, CDMX, Mexico
| | - Mario Rodríguez-Varela
- Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, CDMX, Mexico
| | - Diana García-Rubio
- Laboratorio de Hematobiología, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, CDMX, Mexico
| | | | | | - Carlos Durán-Álvarez
- Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, CDMX, Mexico
| | - Doris Cerecedo
- Laboratorio de Hematobiología, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, CDMX, Mexico.
| |
Collapse
|
3
|
Reus-Chavarría E, Martínez-Vieyra I, Salinas-Nolasco C, Chávez-Piña AE, Méndez-Méndez JV, López-Villegas EO, Sosa-Peinado A, Cerecedo D. Enhanced expression of the Epithelial Sodium Channel in neutrophils from hypertensive patients. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:387-402. [DOI: 10.1016/j.bbamem.2018.11.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 10/29/2018] [Accepted: 11/08/2018] [Indexed: 12/17/2022]
|
4
|
Derivatives of 2,5-Diaryl-1,3-Oxazole and 2,5-Diaryl-1,3,4-Oxadiazole as Environment-Sensitive Fluorescent Probes for Studies of Biological Membranes. REVIEWS IN FLUORESCENCE 2017 2018. [DOI: 10.1007/978-3-030-01569-5_9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
5
|
Posokhov Y. Fluorescent probes sensitive to changes in the cholesterol-to-phospholipids molar ratio in human platelet membranes during atherosclerosis. Methods Appl Fluoresc 2016; 4:034013. [PMID: 28355159 DOI: 10.1088/2050-6120/4/3/034013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Environment-sensitive fluorescent probes were used for the spectroscopic visualization of pathological changes in human platelet membranes during cerebral atherosclerosis. It has been estimated that the ratiometric probes 2-(2'-hydroxyphenyl)-5-phenyl-1,3,4-oxadiazole and 2-phenyl-phenanthr[9,10]oxazole can detect changes in the cholesterol-to-phospholipids molar ratio in human platelet membranes during the disease.
Collapse
Affiliation(s)
- Yevgen Posokhov
- Institute of Chemistry, V.N. Karazin Kharkiv National University, Kharkiv 61022, Ukraine
| |
Collapse
|
6
|
Balogh G, Maulucci G, Gombos I, Horváth I, Török Z, Péter M, Fodor E, Páli T, Benkő S, Parasassi T, De Spirito M, Harwood JL, Vígh L. Heat stress causes spatially-distinct membrane re-modelling in K562 leukemia cells. PLoS One 2011; 6:e21182. [PMID: 21698159 PMCID: PMC3116874 DOI: 10.1371/journal.pone.0021182] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2011] [Accepted: 05/22/2011] [Indexed: 02/05/2023] Open
Abstract
Cellular membranes respond rapidly to various environmental perturbations. Previously we showed that modulations in membrane fluidity achieved by heat stress (HS) resulted in pronounced membrane organization alterations which could be intimately linked to the expression and cellular distribution of heat shock proteins. Here we examine heat-induced membrane changes using several visualisation methods. With Laurdan two-photon microscopy we demonstrate that, in contrast to the enhanced formation of ordered domains in surface membranes, the molecular disorder is significantly elevated within the internal membranes of cells preexposed to mild HS. These results were compared with those obtained by anisotropy, fluorescence lifetime and electron paramagnetic resonance measurements. All probes detected membrane changes upon HS. However, the structurally different probes revealed substantially distinct alterations in membrane heterogeneity. These data call attention to the careful interpretation of results obtained with only a single label. Subtle changes in membrane microstructure in the decision-making of thermal cell killing could have potential application in cancer therapy.
Collapse
Affiliation(s)
- Gábor Balogh
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | | | - Imre Gombos
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Ibolya Horváth
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Zsolt Török
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Mária Péter
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Elfrieda Fodor
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Tibor Páli
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Sándor Benkő
- First Department of Internal Medicine, Albert Szent-Györgyi Clinical Center, University of Szeged, Szeged, Hungary
| | | | - Marco De Spirito
- Istituto di Fisica, Universitá Cattolica Sacro Cuore, Rome, Italy
| | - John L. Harwood
- School of Biosciences, Cardiff University, Cardiff, Wales, United Kingdom
- * E-mail: (LV); (JLH)
| | - László Vígh
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
- * E-mail: (LV); (JLH)
| |
Collapse
|
7
|
Buffone MG, Doncel GF, Calamera JC, Verstraeten SV. Capacitation-associated changes in membrane fluidity in asthenozoospermic human spermatozoa. ACTA ACUST UNITED AC 2009; 32:360-75. [DOI: 10.1111/j.1365-2605.2008.00874.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
8
|
Cao‐Hoang L, Marechal P, Lê‐Thanh M, Gervais P, Waché Y. Fluorescent probes to evaluate the physiological state and activity of microbial biocatalysts: A guide for prokaryotic and eukaryotic investigation. Biotechnol J 2008; 3:890-903. [DOI: 10.1002/biot.200700206] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
9
|
Berquand A, Fa N, Dufrêne YF, Mingeot-Leclercq MP. Interaction of the Macrolide Antibiotic Azithromycin with Lipid Bilayers: Effect on Membrane Organization, Fluidity, and Permeability. Pharm Res 2005; 22:465-75. [PMID: 15835753 DOI: 10.1007/s11095-004-1885-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
PURPOSE To investigate the effect of a macrolide antibiotic, azithromycin, on the molecular organization of DPPC:DOPC, DPPE:DOPC, SM:DOPC, and SM:Chol:DOPC lipid vesicles as well as the effect of azithromycin on membrane fluidity and permeability. METHODS The molecular organization of model membranes was characterized by atomic force microscopy (AFM), and the amount of azithromycin bound to lipid membranes was determined by equilibrium dialysis. The membrane fluidity and permeability were analyzed using fluorescence polarization studies and release of calcein-entrapped liposomes, respectively. RESULTS In situ AFM images revealed that azithromycin leads to the erosion and disappearance of DPPC and DPPE gel domains, whereas no effect was noted on SM and SM:cholesterol domains. Although azithromycin did not alter the permeability of DPPC:DOPC, DPPE:DOPC, SM:DOPC, and SM:Chol:DOPC lipid vesicles, it increased the fluidity at the hydrophilic/hydrophobic interface in DPPC:DOPC and DPPE:DOPC models. This effect may be responsible for the ability of azithromycin to erode the DPPC and DPPE gel domains, as observed by AFM. CONCLUSIONS This study shows the interest of both AFM and biophysical methods to characterize the drug-membrane interactions.
Collapse
Affiliation(s)
- A Berquand
- Unité de Chimie des Interfaces, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | | | | | | |
Collapse
|
10
|
Tyteca D, Schanck A, Dufrêne YF, Deleu M, Courtoy PJ, Tulkens PM, Mingeot-Leclercq MP. The macrolide antibiotic azithromycin interacts with lipids and affects membrane organization and fluidity: studies on Langmuir-Blodgett monolayers, liposomes and J774 macrophages. J Membr Biol 2003; 192:203-15. [PMID: 12820665 DOI: 10.1007/s00232-002-1076-7] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The macrolide antibiotic azithromycin was shown to markedly inhibit endocytosis. Here we investigate the interaction of azithromycin with biomembranes and its effects on membrane biophysics in relation to endocytosis. Equilibrium dialysis and 31P NMR revealed that azithromycin binds to lipidic model membranes and decreases the mobility of phospholipid phosphate heads. In contrast, azithromycin had no effect deeper in the bilayer, based on fluorescence polarization of TMA-DPH and DPH, compounds that, respectively, explore the interfacial and hydrophobic domains of bilayers, and it did not induce membrane fusion, a key event of vesicular trafficking. Atomic force microscopy showed that azithromycin perturbed lateral phase separation in Langmuir-Blodgett monolayers, indicating a perturbation of membrane organization in lateral domains. The consequence of azithromycin/ phospholipid interaction on membrane endocytosis was next evaluated in J774 macrophages by using three tracers with different insertion preferences inside the biological membranes and intracellular trafficking: C6-NBD-SM, TMA-DPH and N-Rh-PE. Azithromycin differentially altered their insertion into the plasma membrane, slowed down membrane trafficking towards lysosomes, as evaluated by the rate of N-Rh-PE self-quenching relief, but did not affect bulk membrane internalization of C6-NBD-SM and TMA-DPH. Azithromycin also decreased plasma membrane fluidity, as shown by TMA-DPH fluorescence polarization and confocal microscopy after labeling by fluorescent concanavalin A. We conclude that azithromycin directly interacts with phospholipids, modifies biophysical properties of membrane and affects membrane dynamics in living cells. This antibiotic may therefore help to elucidate the physico-chemical properties underlying endocytosis.
Collapse
Affiliation(s)
- D Tyteca
- Unité de Pharmacologie Cellulaire et Moléculaire, Université Catholique de Louvain, Brussels, Belgium
| | | | | | | | | | | | | |
Collapse
|
11
|
Kitagawa S, Tachikawa E, Kashimoto T. Transbilayer transport of a propyltrimethylammonium derivative of diphenylhexatriene (TMAP-DPH) in bovine blood platelets and adrenal chromaffin cells. J Pharm Pharmacol 2002; 54:1631-6. [PMID: 12542892 DOI: 10.1211/002235702351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
The membrane fluorescent probe N-((4-(6-phenyl-1,3,5-hexatrienyl)phenyl)propyl)trimethylammonium (TMAP-DPH) has an additional three-carbon spacer between the fluorophore and the trimethylammonium substituent of 1-(4-trimethylammoniumphenyl)-6-phenyl-1,3,5-hexatriene (TMA-DPH). As a basic study to clarify the transport mechanism of amphiphilic quaternary ammoniums, we observed the characteristics of the transbilayer transport of TMAP-DPH in bovine blood platelets and bovine adrenal chromaffin cells using the albumin extraction method. We compared these inward transport rates with those of TMA-DPH. TMAP-DPH crossed into the cytoplasmic layers of the membranes more slowly than TMA-DPH after rapid binding to the outer halves of the plasma membranes. The transport rate markedly depended on temperature. Time to reach the half-maximal incorporated amount of TMAP-DPH increased threefold accompanied by an increase in the concentration from 0.2 to 1.5 microM. The transport was stimulated significantly by various types of membrane perturbations such as modification of sulfhydryl-groups by N-ethylmaleimide and benzyl alcohol-induced increase in the fluidity of the lipid bilayer. The saturation phenomenon suggested the presence of the regulatory process in the transbilayer transport of TMAP-DPH.
Collapse
Affiliation(s)
- Shuji Kitagawa
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Niigata University of Pharmacy and Applied Life Sciences, Kamishin'ei-cho 5-13-2, Niigata 950-2081, Japan.
| | | | | |
Collapse
|
12
|
Mingeot-Leclercq MP, Lins L, Bensliman M, Van Bambeke F, Van Der Smissen P, Peuvot J, Schanck A, Brasseur R. Membrane destabilization induced by beta-amyloid peptide 29-42: importance of the amino-terminus. Chem Phys Lipids 2002; 120:57-74. [PMID: 12426076 DOI: 10.1016/s0009-3084(02)00108-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Increasing evidence implicates interactions between Abeta-peptides and membrane lipids in Alzheimer's disease. To gain insight into the potential role of the free amino group of the N-terminus of Abeta29-42 fragment in these processes, we have investigated the ability of Abeta29-42 unprotected and Abeta29-42 N-protected to interact with negatively-charged liposomes and have calculated the interaction with membrane lipids by conformational analysis. Using vesicles mimicking the composition of neuronal membranes, we show that both peptides have a similar capacity to induce membrane fusion and permeabilization. The fusogenic effect is related to the appearance of non-bilayer structures where isotropic motions occur as shown by 31P and 2H NMR studies. The molecular modeling calculations confirm the experimental observations and suggest that lipid destabilization could be due to the ability of both peptides to adopt metastable positions in the presence of lipids. In conclusion, the presence of a free or protected (acetylated) amino group in the N-terminus of Abeta29-42 is therefore probably not crucial for destabilizing properties of the C-terminal fragment of Abeta peptides.
Collapse
Affiliation(s)
- Marie Paule Mingeot-Leclercq
- Unité de Pharmacologie Cellulaire et Moléculaire, Université Catholique de Louvain, Avenue E. Mounier 73, Bt 7370, B-1200, Brussels, Belgium.
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Martínez-Salgado C, Eleno N, Tavares P, Rodríguez-Barbero A, García-Criado J, Bolaños JP, López-Novoa JM. Involvement of reactive oxygen species on gentamicin-induced mesangial cell activation. Kidney Int 2002; 62:1682-92. [PMID: 12371968 DOI: 10.1046/j.1523-1755.2002.00635.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Reactive oxygen species (ROS) have been shown to be involved in the reduction of glomerular filtration rate observed after gentamicin (Genta) treatment in vivo, a phenomenon directly related with mesangial cell (MC) contraction. Our previous study reported that Genta induces concentration-dependent MC contraction and proliferation in vitro. METHODS To study the possible mediation of ROS in the effect of Genta, ROS production was measured in primary cultures of rat MC stimulated with Genta (10-5 mol/L). In addition, the MC response to Genta in the presence of the ROS scavengers superoxide dismutase (SOD) and catalase (CAT) was studied. MC activation and O2- production were studied in the presence of an inhibitor of the NADP(H) oxidase, diphenylene iodinium (DPI), and in the presence of L-NAME, an inhibitor of nitric oxide synthases (NOS). Finally, the effects of Genta on SOD activity and mRNA expression were examined. RESULTS Genta (10-5 mol/L) induced an increase in O2- production and SOD activity that was neither accompanied by an elevation in cytosolic Cu/Zn-SOD mRNA expression nor by H2O2 accumulation. Genta induced MC contraction and proliferation that were inhibited by SOD plus CAT. Both the extracellular and intracellular ROS donor systems, xantine+xantine oxidase (X+XO) and dimethoxinaphtoquinone (DMNQ), respectively, also stimulated MC contraction and proliferation. Genta-induced MC activation and O2- production were inhibited by DPI. Genta-induced O2- production was inhibited by L-NAME. Furthermore, Genta did not induce detectable changes in membrane fluidity and lipid peroxidation. CONCLUSIONS These results strongly suggest that an oxidative-mediated pathway exists in Genta-induced MC activation. A portion of the production of O2- may be due to NADP(H) oxidase and NOS activation. The amount of ROS produced, rather than having a toxic effect, might play a role as a mediator of Genta-induced MC activation
Collapse
Affiliation(s)
- Carlos Martínez-Salgado
- Departamento de Fisiología y Farmacología and Instituto Reina Sofía de Investigación Nefrológica, Universidad de Salamanca, Salamanca, Spain
| | | | | | | | | | | | | |
Collapse
|
14
|
Mingeot-Leclercq MP, Gallet X, Flore C, Van Bambeke F, Peuvot J, Brasseur R. Experimental and conformational analyses of interactions between butenafine and lipids. Antimicrob Agents Chemother 2001; 45:3347-54. [PMID: 11709307 PMCID: PMC90836 DOI: 10.1128/aac.45.12.3347-3354.2001] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Butenafine (N-4-tert-butylbenzyl-N-methyl-1-naphtalenemethylamine hydrochloride) is an antifungal agent of the benzylamine class that has excellent therapeutic efficacy and a remarkably long duration of action when applied topically to treat various mycoses. Given the lipophilic nature of the molecule, efficacy may be related to an interaction with cell membrane phospholipids and permeabilization of the fungal cell wall. Similarly, high lipophilicity could account for the long duration of action, since fixation to lipids in cutaneous tissues might allow them to act as local depots for slow release of the drug. We have therefore used computer-assisted conformational analysis to investigate the interaction of butenafine with lipids and extended these observations with experimental studies in vitro using liposomes. Conformational analysis of mixed monolayers of phospholipids with the neutral and protonated forms of butenafine highlighted a possible interaction with both the hydrophilic and hydrophobic domains of membrane phospholipids. Studies using liposomes demonstrated that butenafine increases membrane fluidity [assessed by fluorescence polarization of 1-(4-trimethylammonium-phenyl)-6-phenyl-1,3,5-hexatriene and 1,6-diphenylhexatriene] and membrane permeability (studied by release of calcein from liposomes). The results show, therefore, that butenafine readily interacts with lipids and is incorporated into membrane phospholipids. These findings may help explain the excellent antifungal efficacy and long duration of action of this drug when it is used as a topical antifungal agent in humans.
Collapse
Affiliation(s)
- M P Mingeot-Leclercq
- Unité de Pharmacologie Cellulaire et Moléculaire, Université Catholique de Louvain, B-1200 Brussels, Belgium
| | | | | | | | | | | |
Collapse
|
15
|
Tachikawa E, Kudo K, Nunokawa M, Kashimoto T, Takahashi E, Kitagawa S. Characterization of ginseng saponin ginsenoside-Rg(3) inhibition of catecholamine secretion in bovine adrenal chromaffin cells. Biochem Pharmacol 2001; 62:943-51. [PMID: 11543730 DOI: 10.1016/s0006-2952(01)00743-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Since ginsenoside-Rg(3), one of the panaxadiol saponins isolated from the ginseng root, significantly inhibited the secretion of catecholamines from bovine adrenal chromaffin cells stimulated by acetylcholine (ACh), the properties of ginsenoside-Rg(3) inhibition were investigated. Although ginsenoside-Rg(3) inhibited the secretion evoked by ACh in a concentration-dependent manner, it affected the secretion stimulated by high K(+) or veratridine, an activator of the voltage-sensitive Ca(2+) or Na(+) channels, only slightly. The ACh-induced Na(+) and Ca(2+) influxes into the cells were also reduced by ginsenoside-Rg(3). The inhibitory effect of this saponin on the secretion of catecholamines was not altered by increasing the external concentration of ACh or Ca(2+). The ACh-evoked secretion of catecholamines was completely restored in cells that were preincubated with 10 microM ginsenoside-Rg(3) and then incubated without the saponin, whereas secretion was not completely restored in cells that were preincubated with 30 microM of this compound. Above 30 microM ginsenoside-Rg(3) increased the fluorescence anisotropy of diphenylhexatriene in the cells. Furthermore, the inhibitory effect of ginsenoside-Rg(3) at 30 microM on the ACh-evoked secretion of catecholamines was dependent upon the preincubation time, but this was not the case at 10 microM. These results strongly suggest that ginsenoside-Rg(3) blocks the nicotinic ACh receptor-operated cation channels, inhibits Na(+) influx through the channels, and consequently reduces both Ca(2+) influx and catecholamine secretion in bovine adrenal chromaffin cells. In addition to this action, the ginsenoside at higher concentrations modulates the fluidity of the plasma membrane, which probably contributes to the observed reduction in the secretion of catecholamines.
Collapse
Affiliation(s)
- E Tachikawa
- Department of Pharmacology, School of Medicine, Iwate Medical University, Uchimaru 19-1, 020-8505, Morioka, Japan.
| | | | | | | | | | | |
Collapse
|
16
|
Arakawa K, Eguchi T, Kakinuma K. 36-Membered Macrocyclic Diether Lipid is Advantageous for Archaea to Thrive under the Extreme Thermal Environments. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2001. [DOI: 10.1246/bcsj.74.347] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
17
|
Koga K, Ohyashiki T, Murakami M, Kawashima S. Modification of ceftibuten transport by the addition of non-ionic surfactants. Eur J Pharm Biopharm 2000; 49:17-25. [PMID: 10613923 DOI: 10.1016/s0939-6411(99)00059-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The effects of non-ionic surfactants on the carrier-mediated transport of ceftibuten by rat intestinal brush-border membrane vesicles (BBMVs) were investigated. Ceftibuten uptake by BBMVs was measured by a rapid filtration technique. The concentration of surfactants for the uptake experiments was determined by a decrease in the turbidity of BBMV suspension and by the release of an impermeable probe, 2',7'-bis(carboxyethyl)-4(5)-carboxyfluorescein, from the vesicle inside. In fact, the surfactant concentration of 0. 03% (w/v) was selected to maintain the stability of BBMVs. The extent of ceftibuten uptake by BBMVs with various surfactants was correlated with their physicochemical properties, i.e. hydrophile-lipophile balance (HLB), critical micelle concentration (c.m.c.), average diameter of micelle colloid, and polydispersity determined by particle size distribution. The surfactants used were divided into two groups on the basis of polydispersity index (d(w)/d(n)), i.e. low polydispersity (d(w)/d(n) congruent with1) and high polydispersity d(w)/d(n)2). The ceftibuten uptake due to the addition of surfactants with low polydispersity increased with a decrease in the HLB number. These results indicate that the ceftibuten transport is modulated by the size distribution and hydrophobicity of surfactants. In addition, the effects of surfactants on the membrane lipid fluidity monitored by diphenylhexatriene (DPH) and trimethylammonium diphenylhexatriene (TMA-DPH) were investigated. There was significant correlation between ceftibuten uptake and the fluorescence anisotropy of TMA-DPH-labeled membranes due to the addition of surfactants with low polydispersity (r=-0.81, P<0.0001). These results suggest that surfactants with low polydispersity, in part, increase or decrease the outer membrane leaflet, thereby enhancing or suppressing the ceftibuten transport by BBMVs, and that ceftibuten transport caused by surfactants with low polydispersity may be strongly dependent on the hydrophobic interaction.
Collapse
Affiliation(s)
- K Koga
- Division of Pharmaceutical Information, Faculty of Pharmaceutical Sciences, Hokuriku University, Kanazawa, Japan.
| | | | | | | |
Collapse
|
18
|
Affiliation(s)
- L Liscum
- Department of Physiology, Tufts University School of Medicine, 136 Harrison Avenue, Boston, MA 02111, USA.
| | | |
Collapse
|
19
|
Antollini SS, Barrantes FJ. Disclosure of discrete sites for phospholipid and sterols at the protein-lipid interface in native acetylcholine receptor-rich membrane. Biochemistry 1998; 37:16653-62. [PMID: 9843433 DOI: 10.1021/bi9808215] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
There is an increasing body of evidence to support the notion that the function of the nicotinic acetylcholine receptor (AChR) is influenced by its lipid microenvironment [see Barrantes, F. J. (1993) FASEB J. 7, 1460-1467]. We have recently made use of the so-called generalized polarization (GP) of the fluorescent probe Laurdan (6-dodecanoyl-2-(dimethylamino)naphthalene) to learn about the physical state of the lipids in Torpedo marmorata AChR native membrane [Antollini, S. S., Soto, M. A., Bonini de Romanelli, I., Gutiérrez Merino, C., Sotomayor, P., and Barrantes, F. J. (1996) Biophys. J. 70, 1275-1284] and cells expressing endogenous or heterologous AChR [Zanello, L. P., Aztiria, E., Antollini, S., and Barrantes, F. J. (1996) Biophys. J. 70, 2155-2164]. In the present work, Laurdan GP was measured in T. marmorata native AChR membrane by direct excitation or under energy transfer conditions in the presence of exogenous lipids. GP was found to diminish in these two regions upon addition of oleic acid and dioleoylphosphatidylcholine and not to vary significantly upon addition of cholesterol hemisuccinate, indicating an increase in the polarity of the single, ordered-liquid lipid phase in the two former cases. Complementary information about the bulk lipid order was obtained from measurements of fluorescence anisotropy of DPH and two of its derivatives. The membrane order diminished in the presence of oleic acid and dioleoylphosphatidylcholine. The location of Laurdan was determined using the parallax method. Laurdan lies at approximately 10 A from the center of the bilayer, i.e., at depth of approximately 5 A from the lipid-water interface. Exogenous lipids modified the energy transfer efficiency from the intrinsic fluorescence to Laurdan. This strategy is introduced as a new analytic tool that discloses for the first time the occurrence of discrete and independent sites for phospholipids and sterols, respectively, both accessible to fatty acids, and presumably located at a shallow depth close to the phospholipid polar head region in the native AChR membrane.
Collapse
Affiliation(s)
- S S Antollini
- Instituto de Investigaciones Bioquímicas de Bahía Blanca, Argentina
| | | |
Collapse
|
20
|
Kitagawa S, Tachikawa E, Kashimoto T, Nagaoka Y, Iida A, Fujita T. Asymmetrical membrane fluidity of bovine adrenal chromaffin cells and granules and effect of trichosporin-B-VIa. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1375:93-100. [PMID: 9767133 DOI: 10.1016/s0005-2736(98)00143-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We examined membrane fluidity of bovine adrenal chromaffin cells and chromaffin granules using cationic trimethylammonium derivative of diphenylhexatriene (TMA-DPH) as a fluorescence probe. After adding TMA-DPH to the suspension of chromaffin cells and that of granules, it first bound to the outer layer of the plasma membrane of the cells and that of the granule membrane, then gradually penetrated the inner layer of each membrane and distributed to both leaflets of the respective membranes. Accompanying increases in the ratio of incorporated probe on the cytoplasmic side of the chromaffin cell membrane, its fluorescence anisotropy gradually decreased. However, in chromaffin granules, the fluorescence anisotropy gradually increased with increases in the ratio of incorporated probe. These findings suggest that the inner layer of the plasma membrane and outer layer of the granular membrane are more fluid than the corresponding side of each membrane, which is suitable for the fusion between both membranes. We also examined the effect of trichosporin-B-VIa, a fungal ion channel forming alpha-aminoisobutyric acid-containing peptide, on the fluidity of chromaffin cells using TMA-DPH. The peptide decreased the fluorescence anisotropy and increased the fluorescence intensity in the concentration range that induced Ca2+ dependent catecholamine secretion, suggesting that a change in lipid dynamics of the lipid bilayer of the plasma membrane was induced by this peptide.
Collapse
Affiliation(s)
- S Kitagawa
- Niigata College of Pharmacy, Kamishin'ei-cho 5-13-2, Niigata 950-2081, Japan.
| | | | | | | | | | | |
Collapse
|
21
|
Berlin E, Bhathena SJ, McClure D, Peters RC. Dietary menhaden and corn oils and the red blood cell membrane lipid composition and fluidity in hyper- and normocholesterolemic miniature swine. J Nutr 1998; 128:1421-8. [PMID: 9732300 DOI: 10.1093/jn/128.9.1421] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Fatty acids in the diet are readily incorporated into lipids in various tissues. However, it is not clear whether all tissues have the same level of incorporation. Second, (n-6) unsaturated fatty acids increase the fluidity of membranes, but this has not been shown for (n-3) fatty acids. In this study, we measured the incorporation of (n-6) and (n-3) fatty acids into erythrocyte membrane lipids and studied their effects on the fluidity of erythrocyte membranes. One group of female miniature swine was made hypercholesterolemic by feeding the swine cholesterol and lard for 2 mo; the other group served as controls and was fed a stock diet. Both groups were then fed either corn oil or menhaden oil or a mixture of the two for 23 additional weeks. Blood was collected at 0, 2, 4, 12 and 23 wk after initialization of the experimental diets, and fatty acid composition of phospholipids was assessed. Membrane phospholipids of pigs fed menhaden oil had elevated (n-3) fatty acids (20:5 and 22:6), and lower 18:2 than those fed corn oil. There was no difference in 20:4 content. The fatty acid changes occurred as early as 2 wk after consumption of the corn oil or menhaden oil in pigs previously fed a stock diet, but it took longer in pigs previously fed lard + cholesterol, indicating residual effects of pretreatment. Menhaden oil increased anisotropy (indicating decreased fluidity) more than corn oil for the nonpolar probe diphenylhexatriene (DPH) at earlier time points, but not at 23 wk. Erythrocyte membrane fluidity was significantly related to membrane polyunsaturate content, with (n-6) fatty acids having a greater influence than (n-3) fatty acids. A comparison of the present red blood cell fatty acid compositions with brain synaptosome fatty acid compositions for the same animals showed poor correlations for some of the fatty acids. There was no significant direct relationship between docosahexaenoate (DHA) concentrations in erythrocyte membranes with DHA concentrations in brain synaptosomes from cerebellum, forebrain and caudate nucleus.
Collapse
Affiliation(s)
- E Berlin
- Metabolism and Nutrient Interactions, Beltsville Human Nutrition Research Center, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 20705, USA
| | | | | | | |
Collapse
|
22
|
Denisova NA, Erat SA, Kelly JF, Roth GS. Differential effect of aging on cholesterol modulation of carbachol-stimulated low-K(m) GTPase in striatal synaptosomes. Exp Gerontol 1998; 33:249-65. [PMID: 9615923 DOI: 10.1016/s0531-5565(97)00096-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Previous research has suggested that age-related decline in physiological functions may be the result of substantial alterations in membrane molecular structure. The purpose of the present experiments was to elucidate the role of cholesterol domains in the age-related decline in receptor-G-protein interactions in striatal synaptosomes. We observed a significant age-related deficit in muscarinic cholinergic stimulated Low-Km GTPase activity and its age-related susceptibility to cholesterol treatment in range of 10(-10)-10(-5) M. Treatment of synaptosomes from old rats with cholesterol in range of 10(-8)-10(-6) M restored the Low-Km GTPase activity up to the level seen in young animals and reached a maximum at 10(-7) M. In synaptosomes from young rats, however, cholesterol treatment did not have any effect on striatal Low-Km GTPase activity. We observed significant alterations in the membrane lipid composition of striatal synaptosomes as a function of age. Our results suggested a significant interaction of age and cholesterol treatment on physical properties of striatal synaptosomes. Thus, the present results of experiments in vitro support our previous results of experiments in vivo and suggested an interaction of cholesterol domains with muscarinic-cholinergic receptor G-protein alpha subunit coupling/uncoupling through regulation of physical properties of striatal synaptosomes.
Collapse
Affiliation(s)
- N A Denisova
- Molecular Physiology and Genetics Section, National Institute on Aging, Johns Hopkins Bayview Medical Center, Baltimore, Maryland 21224, USA.
| | | | | | | |
Collapse
|
23
|
Hollán S, Magócsi M, Fodor E, Horányi M, Harsányi V, Farkas T. Search for the pathogenesis of the differing phenotype in two compound heterozygote Hungarian brothers with the same genotypic triosephosphate isomerase deficiency. Proc Natl Acad Sci U S A 1997; 94:10362-6. [PMID: 9294216 PMCID: PMC23368 DOI: 10.1073/pnas.94.19.10362] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
In a Hungarian family with triosephosphate isomerase (TPI) deficiency, two compound heterozygote brothers were found with the same severe decrease in TPI activity, but only one of them had the classical symptoms. In search for the pathogenesis of the differing phenotype of the same genotypic TPI deficiency, an increase in red cell membrane fluidity was found. There were roughly 100% and 30% more 16:0/20:4 and 18:0/20:4 diacyl-phosphatidylcholine species in erythrocytes from the two TPI-deficient brothers than in the probes from healthy controls. The activities of acethylcholinesterase and calmodulin induced Ca2+ ATPase were significantly enhanced in erythrocytes from the propositus as compared with those of the neurologically symptom-free brother and other members of the TPI-deficient family as well as to those from healthy controls. Both enzymes are crucially involved in the function of nerve cells. The observed differences in membrane fluidity and enzyme activities between the erythrocytes from the phenotypically differing TPI-deficient brothers underline the importance of investigations into the effect of biophysical changes in the lipid environment of the membrane proteins on the development of disseminated focal neurological disorders of unknown pathogenic origin.
Collapse
Affiliation(s)
- S Hollán
- National Institute of Hematology and Immunology, H-1113 Budapest, Hungary
| | | | | | | | | | | |
Collapse
|
24
|
Abstract
Nuclear membrane fluidity is measured in rat liver by use of the fluorescence anisotropy of two probes: diphenylhexatriene and its cationic derivative trimethylammonium-diphenylhexatriene. It has been shown that, in 2-month-old rat liver cells, the bilayer surface is less fluid than the hydrophobic core. The fluidity was higher in 6-day-old rat liver nuclei, in which both the amount of cholesterol and the cholesterol/phospholipid ratio decreased. The influence of the single phospholipids, and in particular of phosphatidylcholine, has been studied by increasing the phosphatidylcholine with a choline base exchange reaction in isolated nuclear membranes. After this reaction, the fluorescence anisotropy of the bilayer surface increased, whereas at the hydrophobic core it decreased. Analysis of fatty acid composition shows an increase of phosphatidylcholine unsaturated fatty acids. The results show that the fluidity of nuclear membranes changes in relation to the lipid content and to the fatty acid composition. The role of nuclear membrane fluidity in cell function is discussed.
Collapse
Affiliation(s)
- E Albi
- Institute of General Pathology, University of Perugia, Italy
| | | | | |
Collapse
|
25
|
Török Z, Horváth I, Goloubinoff P, Kovács E, Glatz A, Balogh G, Vígh L. Evidence for a lipochaperonin: association of active protein-folding GroESL oligomers with lipids can stabilize membranes under heat shock conditions. Proc Natl Acad Sci U S A 1997; 94:2192-7. [PMID: 9122170 PMCID: PMC20063 DOI: 10.1073/pnas.94.6.2192] [Citation(s) in RCA: 175] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
During heat shock, structural changes in proteins and membranes may lead to cell death. While GroE and other chaperone proteins are involved in the prevention of stress-induced protein aggregation and in the recovery of protein structures, a mechanism for short-term membrane stabilization during stress remains to be established. We found that GroEL chaperonin can associate with model lipid membranes. Binding was apparently governed by the composition and the physical state of the host bilayer. Limited proteolysis of GroEL oligomers by proteinase K, which removes selectively the conserved glycine- and methionine-rich C terminus, leaving the chaperonin oligomer intact, prevented chaperonin association with lipid membranes. GroEL increased the lipid order in the liquid crystalline state, yet remained functional as a protein-folding chaperonin. This suggests that, during stress, chaperonins can assume the functions of assisting the folding of both soluble and membrane-associated proteins while concomitantly stabilizing lipid membranes.
Collapse
Affiliation(s)
- Z Török
- Institute of Biochemistry, Biological Research Centre, Szeged, Hungary
| | | | | | | | | | | | | |
Collapse
|
26
|
Richman JE, Chang YC, Kambourakis S, Draths KM, Almy E, Snell KD, Strasburg GM, Frost JW. Reaction of 3-Dehydroshikimic Acid with Molecular Oxygen and Hydrogen Peroxide: Products, Mechanism, and Associated Antioxidant Activity. J Am Chem Soc 1996. [DOI: 10.1021/ja952317i] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jack E. Richman
- Contribution from the Departments of Chemistry and Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824
| | - Yu-Chen Chang
- Contribution from the Departments of Chemistry and Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824
| | - Spiros Kambourakis
- Contribution from the Departments of Chemistry and Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824
| | - K. M. Draths
- Contribution from the Departments of Chemistry and Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824
| | - Erick Almy
- Contribution from the Departments of Chemistry and Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824
| | - Kristi D. Snell
- Contribution from the Departments of Chemistry and Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824
| | - Gale M. Strasburg
- Contribution from the Departments of Chemistry and Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824
| | - J. W. Frost
- Contribution from the Departments of Chemistry and Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824
| |
Collapse
|
27
|
Montenez JP, Van Bambeke F, Piret J, Schanck A, Brasseur R, Tulkens PM, Mingeot-Leclercq MP. Interaction of the macrolide azithromycin with phospholipids. II. Biophysical and computer-aided conformational studies. Eur J Pharmacol 1996; 314:215-27. [PMID: 8957239 DOI: 10.1016/s0014-2999(96)00553-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In a comparison paper, we show the azithromycin causes a lysosomal phospholipidosis in cultured cells, binds in vitro to negatively charged bilayers without causing aggregation or fusion, and inhibits lysosomal phospholipase A1. In this paper, we show that azithromycin decreases the mobility of the phospholipids in negatively charged liposomes (using 31P nuclear magnetic resonance) and that it increases the fluidity of the acyl chains close to the hydrophilic/hydrophobic interface, but not deeper into the hydrophobic domain (assessed by measuring the fluorescence polarization of trimethylammonium-diphenylhexatriene and diphenyhexatriene, respectively). Computer-aided conformational analysis of mixed monolayers of azithromycin and phosphatidylinositol shows that the drug can be positioned largely in the hydrophobic domain, but close to the interface, with the macrocycle facing the C1 of the fatty acids (allowing the N9a endocyclic tertiary amine to interact with the phospho-groups), the cladinose located on the hydrophobic side of the lipid/water interface and the desosamine projected into the hydrophobic domain. This position is consistent with the experimental data. Analysis of virtual molecules shows that this unanticipated behavior to the shielding of the ionizable N3' amino-group in the desosamine by methyl-groups, and to the wide dispersion of hydrophobic domains all over the molecule. The interaction of azithromycin with phospholipids may account for some of its unusual pharmacokinetic properties and for its potential to cause lysosomal phospholipidosis.
Collapse
Affiliation(s)
- J P Montenez
- Unité de Pharmacologie Cellulaire et Moléculaire, Université Catholique de Louvain, UCL 73.70, Bruxelles, Belgium
| | | | | | | | | | | | | |
Collapse
|
28
|
Radiation damage to lymphocyte membranes. J Radioanal Nucl Chem 1996. [DOI: 10.1007/bf02040468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
29
|
Berlin E, Hannah JS, Yamane K, Peters RC, Howard BV. Fatty acid modification of membrane fluidity in Chinese hamster ovary (TR715-19) cells. Int J Biochem Cell Biol 1996; 28:1131-9. [PMID: 8930137 DOI: 10.1016/1357-2725(96)00063-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Dietary saturated fatty acids, especially lauric (12:0), myristic (14:0) and palmitic (16:0) acids, which are hypercholesterolemic, influence cell membrane fatty acid composition and affect LDL receptor function. When membrane phospholipid fatty acids in Chinese hamster ovary cells, containing the human LDL receptor, were modified (Hannah J. S. et al., 1995 Metabolism 44, 1428-1434), LDL receptor function was affected, but correlations with DPH-determined membrane fluidity were weak. The role of fluidity in various membrane domains with respect to the LDL receptor is examined here. Membrane fluidity was assessed by measuring steady-state fluorescence polarization of diphenylhexatriene (DPH) and its polar propionic acid (DPH-PA) and trimethylammonium (TMA-DPH) derivatives from 38 to 4 degrees C in fatty acid modified Chinese hamster ovary cells. Fatty acid changes modulated mid-bilayer fluidity as determined with DPH, but fluidity in phospholipid headgroup domains, assessed with DPH-PA and TMA-DPH, was independent of fatty acyl composition. The DPH fluidity was related to membrane unsaturation (P < 0.02), oleate contents (P < 0.009) in particular, but inversely related (P < 0.0002) to the longer chain (> or = 20 C atoms) unsaturated fatty acids with from four to six double bonds. The LDL binding was independent of fluidity, but there were weak relations between LDL internalization and DPH-PA anisotropy and between LDL degradation and TMA-DPH anisotropy. It was concluded that LDL binding was not related to mid-bilayer fluidity, but the results with the polar probes suggest a role of fluidity in modulating vertical displacement of the LDL/LDL receptor complex across the plasma membrane.
Collapse
Affiliation(s)
- E Berlin
- Metabolism and Nutrient Interactions Laboratory, Beltsville Human Nutrition Research Center, U.S. Department of Agriculture, MD 20705, USA
| | | | | | | | | |
Collapse
|
30
|
McClean E, McGrath LT, Archbold GP. Comparison of two fluorescent probes for the measurement of erythrocyte membrane fluidity in renal dialysis patients. Ir J Med Sci 1995; 164:289-92. [PMID: 8522433 DOI: 10.1007/bf02967207] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Two fluorescent probes were used for the measurement of membrane fluidity in patients on haemodialysis and continuous ambulatory peritoneal dialysis. 1,6-Diphenyl-1,3,5-hexatriene (DPH) anisotropy gives an indication of lipid order and pyrene measures lateral diffusion through the membrane. Pyrene dimer/monomer ratio was significantly lower than controls in both pre-dialysis and post-dialysis samples but DPH anisotropy was unchanged. Both methods showed an increase in membrane fluidity across a 4 hour haemodialysis session. There was an increase in membrane fluidity in CAPD patient samples which was more marked using DPH than pyrene. These results suggest that the two probes give different but complementary information about changes in membrane fluidity and may be more informative when used together rather than singly.
Collapse
Affiliation(s)
- E McClean
- Department of Clinical Chemistry, Belfast City Hospital, N. Ireland
| | | | | |
Collapse
|
31
|
Yang FY, Huang YG, Tu YP. Transmembrane Ca2+ gradient and function of membrane proteins. Biosci Rep 1995; 15:351-64. [PMID: 8825037 DOI: 10.1007/bf01788367] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
This review will focus on the recent advance in the study of effect of transmembrane Ca2+ gradient on the function of membrane proteins. It consits of two parts: 1. Transmembrane Ca2+ gradient and sarcoplasmic reticulum Ca(2+)-ATPase; 2. Effect of transmembrane Ca2+ gradient on the components and coupling of cAMP signal transduction pathway. The results obtained indicate that a proper transmembrane Ca2+ gradient may play an important role in modulating the conformation and activity of SR Ca(2+)-ATPase and the function of membrane proteins involved in the cAMP signal transduction by mediating the physical state change of the membrane phospholipids.
Collapse
Affiliation(s)
- F Y Yang
- National Laboratory of Biomacromolecules, Institute of Biophysics, Beijing, China
| | | | | |
Collapse
|
32
|
Hollán S, Dey I, Szollár L, Horányi M, Magócsi M, Harsányi V, Farkas T. Erythrocyte lipids in triose-phosphate isomerase deficiency. Proc Natl Acad Sci U S A 1995; 92:268-71. [PMID: 7816830 PMCID: PMC42859 DOI: 10.1073/pnas.92.1.268] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Marked hypoalphalipoproteinemia was found together with relatively low serum cholesterol, triacylglycerol, and LDL levels in a triose-phosphate isomerase (TPI; D-glyceraldehyde-3-phosphate ketol-isomerase, EC 5.3.1.1)-deficient Hungarian family, especially in the two compound-heterozygote brothers. Apart from a slight increase in palmitic and stearic acids together with a slight decrease in oleic and linoleic acids, no other changes were found in the fatty acid composition of the erythrocyte phospholipids. Anisotropy measurements with n-(9-anthroyloxy) stearic and -palmitic acid fluorophores revealed increased motional freedom of the fatty acid chains in the external lipid layers of the intact erythrocytes from all members of the TPI-deficient family as compared with normal age-matched controls. This asymmetric increase in membrane fluidity was found to be significantly higher in the propositus than in his compound-heterozygote brother without any neurological disorders. The change in membrane fluidity may result from as-yet-unresolved aspects of the lipid composition of the plasma membrane. Our findings that the differences between the TPI-deficient individuals and normal controls and the differences between the two compound-heterozygote brothers were all absent in the phospholipid extracts of the same erythrocytes favor the assumption that the increased motional freedom of the fatty acid chains in the external surface of the bilayer is caused by the binding of the mutant TPI molecule to the N-terminal sequence of band 3 protein.
Collapse
Affiliation(s)
- S Hollán
- National Institute of Haematology, Blood Transfusion and Immunology, Budapest, Hungary
| | | | | | | | | | | | | |
Collapse
|
33
|
Berlin E, Bhathena SJ, Judd JT, Clevidence BA, Peters RC. Human erythrocyte membrane fluidity and insulin binding are independent of dietary trans fatty acids. J Nutr Biochem 1994. [DOI: 10.1016/0955-2863(94)90014-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
34
|
Ladha S, Mackie AR, Clark DC. Cheek cell membrane fluidity measured by fluorescence recovery after photobleaching and steady-state fluorescence anisotropy. J Membr Biol 1994; 142:223-8. [PMID: 7884814 DOI: 10.1007/bf00234944] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Membrane fluidity of human cheek cells was determined using fluorescence recovery after photobleaching (FRAP) and steady-state fluorescence anisotropy. The FRAP data showed that the lateral diffusion coefficient (D) and mobile fraction (%R) of lipid in the plasma membrane of control cells were 2.01 x 10(-9) cm2/sec and 54.25%, respectively. Trypsin treatment increased D and %R to 6.4 x 10(-9) cm2/sec and 72.15%. In contrast, the anisotropy (r) for control cells was 0.270 which remained unchanged by trypsin treatment. The results show that diffusion of lipids in the plane of the membrane is restricted by trypsin-sensitive barriers.
Collapse
Affiliation(s)
- S Ladha
- Institute of Food Research, Norwich Laboratory, Colney, England
| | | | | |
Collapse
|
35
|
Berlin E, McClure D, Banks MA, Peters RC. Heart and liver fatty acid composition and vitamin E content in miniature swine fed diets containing corn and menhaden oils. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. PHYSIOLOGY 1994; 109:53-61. [PMID: 8076453 DOI: 10.1016/0300-9629(94)90311-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Female miniature swine, 4-11 yr, were fed 15% fat diets containing n-3 and/or n-6 polyunsaturated fat for 6 months, at 1.95 g fat/kg body weight. Liver lipids from menhaden oil-fed minipigs were elevated in the n-3 fatty acids: 20:5, 22:5 and 22:6, but heart lipids only in 20:5 and 22:6. Liver cell plasma membrane was elevated in 20:5, 22:5 and 22:6 and lowered in the n-6 acids 18:2 and 20:4 in menhaden oil-fed animals, to a greater extent than in the total tissue lipids. Liver alpha-tocopherol tended to decrease upon feeding menhaden oil, but heart alpha-tocopherol concentrations were not affected.
Collapse
Affiliation(s)
- E Berlin
- Lipid Nutrition Laboratory, Beltsville Human Nutrition Research Center, MD 20705
| | | | | | | |
Collapse
|
36
|
Buda C, Dey I, Balogh N, Horvath LI, Maderspach K, Juhasz M, Yeo YK, Farkas T. Structural order of membranes and composition of phospholipids in fish brain cells during thermal acclimatization. Proc Natl Acad Sci U S A 1994; 91:8234-8. [PMID: 8058786 PMCID: PMC44580 DOI: 10.1073/pnas.91.17.8234] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
A comparison of the structural orders of membranes of a mixed brain-cell population isolated from Cyprinus carpio L. acclimated to either summer (23-25 degrees C) or winter (5 degrees C) revealed a high degree of compensation (80%) for temperature, as assayed by electron spin resonance spectroscopy. The cells rapidly forget their thermal history and adjust the physical properties of the membranes when shifted to the other extreme of temperature either in vivo or in vitro. Phospholipids separated from both types of animals exhibit only around 10% compensation. Arachidonic and docosahexaenoic acids are the major polyunsaturated fatty acids in the brains, but the fatty acid composition of the brain total phospholipids does not vary with adaptation to temperature. Separation of phosphatidylcholines and phosphatidylethanolamines into molecular species revealed a 2- to 3-fold accumulation of 18:1/22:6, 18:1/20:4, and 18:1/18:1 species in the latter; 18:0/22:6 showed an opposite tendency. Molecular species composition of phosphatidylcholines did not vary with the temperature. The same trends of changes were seen with brains of freshwater fish from subtropical (Catla catla L.) or boreal (Acerina cernua) regions. It is concluded that the gross amount of docosahexaenoic acid (22:6) plays only a minor role in adjusting the membrane physical properties to temperature. Factors other than lipids might be involved in the adaptation processes. Due to their specific molecular architecture, molecules such as 18:1/22:6, 18:1/20:4, or 18:1/18:1 phosphatidylethanolamine might prevent the contraction of membranes in the cold and may provide an environment for some other components involved in the temperature regulation of physical properties of nerve cell membranes.
Collapse
Affiliation(s)
- C Buda
- Institute of Biochemistry, Hungarian Academy of Sciences, Szeged
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Schootemeijer A, van Beekhuizen AE, Gorter G, Tertoolen LG, de Laat SW, Akkerman JW. Rapid alterations in lateral mobility of lipids in the plasma membrane of activated human megakaryocytes. EUROPEAN JOURNAL OF BIOCHEMISTRY 1994; 221:353-62. [PMID: 8168523 DOI: 10.1111/j.1432-1033.1994.tb18747.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In the present study we measured membrane fluidity as the lateral mobility of the lipid probe 1,1'-ditetradecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate by fluorescence recovery after photobleaching in the plasma membrane of a single megakaryocyte, the progenitor cell of platelets. Megakaryocytes after 13 days in culture (maturation stage III) had a lateral diffusion coefficient (D) of (4.56 +/- 0.10) x 10(-9) cm2/s and a mobile fraction of 65 +/- 2% (means +/- SEM, n = 140). Megakaryocytes isolated from rib had a similar D and mobile fraction. Stimulation with alpha-thrombin (1-10 U/ml) induced a dose-dependent decrease in D to (3.40 +/- 0.22) x 10(-9) cm2/s between 1-5 min after stimulation (P < 0.001). The mobile fraction did not change. A similar decrease in D was found following stimulation with ADP (20 microM) and ionomycin (100 nM). Modulation of calpain I activity with calpain I inhibitor or tetracain had no effect. Pretreatment with cytochalasin B or colchicine decreased D to (3.64 +/- 0.29) x 10(-9) cm2/s (P < 0.003) and (3.96 +/- 0.18) x 10(-9) cm2/s (P < 0.013) respectively. After stimulation D decreased further in cytochalasin-treated cells (3.37 +/- 0.16) x 10(-9) cm2/s (P < 0.020) but remained at the same level in colchicine-treated cells. Both treatments increased the mobile fraction to 73-75% in stimulated megakaryocytes (P < 0.03). These data indicate that the diffusion velocity of lipids in megakaryocytes is low and decreases further after stimulation. These changes are independent of calpain I. Treatments that decrease the cytoskeletal mass and thereby increase the mobility of proteins in the plasma membrane increase the number of lipids that participate in this process.
Collapse
Affiliation(s)
- A Schootemeijer
- Department of Haematology, University Hospital Utrecht, The Netherlands
| | | | | | | | | | | |
Collapse
|
38
|
Kálmán J, Dey I, Ilona SV, Matkovics B, Brown D, Janka Z, Farkas T, Joó F. Platelet membrane fluidity and plasma malondialdehyde levels in Alzheimer's demented patients with and without family history of dementia. Biol Psychiatry 1994; 35:190-4. [PMID: 8173019 DOI: 10.1016/0006-3223(94)91151-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Platelet membrane fluidity (PMF) was measured with three different fluorescent probes, 1,6-diphenyl-1,3,5-hexatriene (DPH), 1-(4-trimethylammoniumphenyl)-6-phenyl-1,3,5-hexatriene (TMA-DPH), 3-(p-phenyl-1,3,5-hexatrienyl)phenyl-propionic acid (DPH-PA), which labeled different parts of the bilayer (the hydrophobic core and the positively and negatively charged regions, respectively) in Alzheimer's disease (AD) patients with and without a family history of dementia, and in a control group. In support of earlier findings in the literature, significantly increased PMF was found by the application of DPH in both groups with AD. The use of the fluorescence probe TMA-DPH, however, revealed no differences between the groups. In contrast, significant rigidification was observed with DPH-PA, but only in the AD group with a positive family history of dementia. The plasma malondialdehyde levels appeared to be similar in each group. Our findings are discussed in light of the controversies regarding the value of PMF measurements in AD.
Collapse
Affiliation(s)
- J Kálmán
- Department of Neurology and Psychiatry, Albert Szent-Györgyi Medical University, Szeged, Hungary
| | | | | | | | | | | | | | | |
Collapse
|
39
|
Kitagawa S, Orinaka M, Hirata H. Depth-dependent change in membrane fluidity by phenolic compounds in bovine platelets and its relationship with their effects on aggregation and adenylate cyclase activity. BIOCHIMICA ET BIOPHYSICA ACTA 1993; 1179:277-82. [PMID: 8218372 DOI: 10.1016/0167-4889(93)90083-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The effects of phenolic compounds on membrane fluidity of bovine blood platelets were investigated by studies on the fluorescence anisotropies of diphenylhexatriene (DPH) and its ionic derivatives to clarify the relationship of these effects with the inhibitory effects of the compounds on aggregation. Among the phenolic compounds tested, monohydric phenols (phenol and two monosubstituted derivatives) decreased the fluorescence anisotropy of DPH, which is thought to be located within the hydrophobic core of the membrane, in concentration ranges in which they inhibited platelet aggregation. On the other hand, they had little or no effects on the fluorescence anisotropies of the ionic derivatives of DPH, which are thought to be located in the interfacial region of the lipid bilayer. Consistent with their effects on the fluorescence anisotropy of DPH, these monohydric phenols increased the intracellular cAMP concentration. Thus, these monohydric phenols may inhibit platelet function by stimulation of adenylate cyclase mediated by perturbation of the central region of the membrane lipid bilayer. On the other hand, pyrocatechol and pyrogallol, which have two and three phenolic hydroxyl groups and have much larger electron donor activities than the monohydric phenols tested, inhibited platelet function by a different mechanism, because they did not cause increase in either membrane fluidity or the cAMP concentration of platelets.
Collapse
|
40
|
Shorte SL, Stafford SJ, Bamford M, Collett VJ, Schofield JG. Thyroliberin-induced changes in the fluorescence of a membrane probe in individual bovine anterior pituitary cells. J Physiol 1993; 470:191-210. [PMID: 8308725 PMCID: PMC1143913 DOI: 10.1113/jphysiol.1993.sp019854] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
1. We have investigated the use of TMA-DPH (1-[4-(trimethylammonio) phenyl]-6-phenylhexa-1,3,5-triene) as an indicator of exocytosis in individual bovine anterior pituitary cells using microfluorimetric imaging. 2. TMA-DPH was photolabile in artificial and cell membranes. In cells incubated in TMA-DPH the distribution of fluorescence depended both on the incubation time and the illumination schedule. If the dye was added while the cells were subjected to repeated cycles of 0.36 s light intermittent with 1-15 s dark, the fluorescence of the peripheral annulus and the central region of individual cells rose in parallel and reached a steady state within 200 s; the annulus was always brighter than the central region. However, using long intervening dark periods (200 s), the central region continued to incorporate dye after the annulus had reached a plateau. 3. When the cells were loaded with TMA-DPH using intermittent light with short dark periods, the dye washed out of the central region and the annulus in parallel when external dye was removed. However, if the cells had been loaded using long dark periods, the dye was washed out of the central region more slowly than from the annulus. 4. When cells were incubated in TMA-DPH in the dark for 1 min and then exposed to constant illumination in the presence of external dye, the fluorescence of the central region and the annulus both decayed in parallel to a new steady state. If the cells were incubated in TMA-DPH in the dark for 240 min the fluorescence from each region fell to a steady state but the falls were larger and were not in parallel. 5. We suggest that TMA-DPH fluorescence was derived from plasma membrane-associated and internalized dye and that the amount of fluorescence from the latter varied because TMA-DPH was photobleached. Thus, when illumination was interrupted by short dark intervals, annular fluorescence was high compared to central fluorescence because bleached dye in the plasma membrane was rapidly replaced by unbleached dye from the medium. However, long dark intervals permitted the dye to be internalized before it was bleached and fluorescence was therefore also present in central regions. 6. The total cell fluorescence, observed using 15 s dark intervals, was increased 5-40% (in single cells) in a dose-dependent fashion by addition of TRH (tripeptide thyrotrophin-releasing hormone; 1-200 nM).(ABSTRACT TRUNCATED AT 400 WORDS)
Collapse
Affiliation(s)
- S L Shorte
- Department of Biochemistry, School of Medical Sciences, University of Bristol
| | | | | | | | | |
Collapse
|
41
|
Dey I, Szegletes T, Buda C, Nemcsok J, Farkas T. Fish erythrocytes as a tool to study temperature-induced responses in plasma membranes. Lipids 1993. [DOI: 10.1007/bf02535997] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
42
|
|
43
|
Dey I, Farkas T. Temperature shifts induce adaptive changes in the physical state of carp (Cyprinus carpio L.) erythrocyte plasma membranes in vitro. FISH PHYSIOLOGY AND BIOCHEMISTRY 1992; 10:347-355. [PMID: 24214332 DOI: 10.1007/bf00004484] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/28/1992] [Indexed: 06/02/2023]
Abstract
Blood, freshly collected from warm- and cold-acclimated carp, Cyprinus carpio L., was cooled to 5°C for 4h or warmed to 25°C for 4h, respectively, and the fluorescence anisotropy of washed red blood cells was recorded using the fluorescent dye 3-(p-(6-phenyl-1,3,5-hexatrienyl) phenyl propionic acid [DPH-PA] (which is restricted to the outer leaflet of the plasma membrane) before and after the temperature shift. Despite individual variation, the plasma membrane of cold-exposed erythrocytes became more fluid while that of warm-exposed cells became more rigid following the temperature shift. This response was rapid and reversible. Cold-exposed cells from warm-acclimated fish became more fluid within 40-60 minutes and reverted to their original fluidity within the same time on warming, at a rate of 1°C/min; erythrocytes, from cold-adapted carp displayed an opposite change in fluidity over a similar time period. Cells from warm-acclimated, temperature down-shifted carp hyperfluidized their plasma membranes in the cold, whereas cells from cold-acclimated fish up-shifted in temperature showed no similar effect. These cells showed a complete adjustment of membrane physical state to the temperature. Total phospholipids obtained from warm-acclimated temperature down-shifted cells became more rigid than they were, when assayed at the acclimation temperature. In contrast, phospholipids obtained from cold-acclimated cells became more rigid when exposed to increasing temperatures. No significant changes occurred to the polar head groups, or to the fatty acid composition of the total phospholipids. It was concluded that the lipids play only a secondary role in the control of the physical state of plasma membrane in carp erythrocytes, and that some non-lipid components of these structures might be involved in these regulatory processes.
Collapse
Affiliation(s)
- I Dey
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, H-6701, Szeged, Hungary
| | | |
Collapse
|
44
|
Kitagawa S, Hirata H. Effects of alcohols on fluorescence anisotropies of diphenylhexatriene and its derivatives in bovine blood platelets: relationships of the depth-dependent change in membrane fluidity by alcohols with their effects on platelet aggregation and adenylate cyclase activity. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1112:14-8. [PMID: 1329963 DOI: 10.1016/0005-2736(92)90247-j] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The effects of three short-chain alkyl alcohols and benzyl alcohol on the membrane fluidity of bovine blood platelets were investigated by studies on the fluorescence anisotropies of diphenylhexatriene (DPH), its cationic trimethylammonium derivative (TMA-DPH) and its anionic propionic acid derivative (DPH-PA). These alcohols decreased the fluorescence anisotropy of DPH, which is thought to be located within the hydrophobic core of the membrane, in concentration ranges that inhibited platelet aggregation. On the other hand, they had little or no effects on the fluorescence anisotropy of DPH-PA which is thought to be located in the interfacial region of the lipid bilayer. Likewise, they had little or no effects on the fluorescence anisotropy of TMA-DPH, which is also thought to be located in the interfacial region of the lipid bilayer, either when the probe was located in the outer layer of the plasma membrane or when the probe was located in the inner membrane compartment. These results suggest that alcohols mainly increase the fluidity in the central region of the lipid bilayer. Consistent with their effects on the fluorescence anisotropy of DPH, these alcohols increased the intracellular cyclic AMP concentration. Thus alcohols may inhibit platelet function due to stimulation of adenylate cyclase, which is mediated by perturbation of the central region of the membrane lipid bilayer.
Collapse
Affiliation(s)
- S Kitagawa
- Niigata College of Pharmacy, Niigata, Japan
| | | |
Collapse
|
45
|
Hazel JR, McKinley SJ, Williams EE. Thermal adaptation in biological membranes: interacting effects of temperature and pH. J Comp Physiol B 1992. [DOI: 10.1007/bf00296639] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
46
|
Christon R, Fernandez Y, Linard A, Périquet A, Deltour P, Mitjavila S. Diet-induced structural and functional modifications in the pig liver endoplasmic reticulum membrane: effect of polyunsaturated fatty acid deficiency. J Nutr Biochem 1992. [DOI: 10.1016/0955-2863(92)90072-q] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
47
|
Kitagawa S, Takegaki M. Transbilayer incorporation of 1-pyrenebutyltrimethylammonium by blood platelets and its application for analyzing changes in physico-chemical properties of the membrane lipid bilayer induced by platelet activation. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1107:231-7. [PMID: 1504067 DOI: 10.1016/0005-2736(92)90409-f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The binding of cationic butyltrimethylammonium derivative of pyrene to bovine platelets was initially rapid and then increased gradually, unlike the bindings of other anionic and neutral derivatives of pyrene tested. The rate of increase in binding of the cationic probe depended on temperature and was due to its incorporation into the cytoplasmic side of the platelet membranes, as shown quantitatively by monitoring decrease in its extractability with albumin. The penetration into the inner membrane compartment did not reach equilibrium even after 4 h at 37 degrees C. Slow penetration of a fluorescent probe such as this is useful in studies on the physico-chemical properties of the outer layer and cytoplasmic side of the platelet membranes and their changes. Initial rapid binding of the cationic probe to platelets, representing the binding of the probe to the outer layer of the plasma membrane, was increased by ionomycin-induced platelet activation. Fluorescence spectra in the presence of a relatively high concentration of the cationic probe showed increase of the excimer of the cationic probe accompanied with the incorporation of the probe to the cytoplasmic side. On ionomycin-induced activation, the excimer-to-monomer intensity ratio of the probe in the cytoplasmic side of the platelet membranes decreased, possibly due to decrease in fluidity of the lipid layer near the probe or change in distribution of the probe.
Collapse
|
48
|
Meddings JB, Hogaboam CM, Tran K, Reynolds JD, Wallace JL. Capsaicin effects on non-neuronal plasma membranes. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1070:43-50. [PMID: 1751537 DOI: 10.1016/0005-2736(91)90144-w] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Capsaicin has been touted as a pharmacological tool specific for sensory afferent neurons and is widely used in neurophysiological studies. However, we have recently demonstrated that in concentrations commonly employed within the gastrointestinal tract, capsaicin inhibits platelet aggregation to at least three different stimuli. Since this was observed in a nerve free system it raised the question of how specific capsaicin is. In this communication we report that capsaicin has profound effects on physical properties of non-neuronal cell plasma membranes. These effects were observed while measuring the effect of capsaicin upon the fluidity of both intact cell membranes and a variety of purified membrane preparations. Membrane fluidity was assessed with the fluorescent probes diphenylhexatriene (DPH) and its trimethylamino derivative TMA-DPH and demonstrated concentration-dependent capsaicin effects. Furthermore, the effects were cell specific and for full expression required both intact cells and a non-lipid extractable component of the plasma membrane. These non-neuronal effects must be carefully considered when contemplating the explanation for capsaicin-induced effects.
Collapse
Affiliation(s)
- J B Meddings
- Faculty of Medicine, University of Calgary, Alberta, Canada
| | | | | | | | | |
Collapse
|