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Alvero-Gonzalez LM, Aurora Perini D, Queralt-Martín M, Perálvarez-Marín A, Viñas C, Alcaraz A. Probing electrophysiological activity of amphiphilic Dynorphin A in planar neutral membranes reveals both ion channel-like activity and neuropeptide translocation. Bioelectrochemistry 2023; 154:108527. [PMID: 37531663 DOI: 10.1016/j.bioelechem.2023.108527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 07/10/2023] [Accepted: 07/26/2023] [Indexed: 08/04/2023]
Abstract
Dynorphin A (DynA) is an endogenous neuropeptide that besides acting as a ligand of the κ-opioid receptor, presents some non-opioid pathophysiological properties associated to its ability to induce cell permeability similarly to cell-penetrating peptides (CPPs). Here, we use electrophysiology experiments to show that amphiphilic DynA generates aqueous pores in neutral membranes similar to those reported previously in charged membranes, but we also find other events thermodynamically incompatible with voltage-driven ion channel activity (i.e. non-zero currents with no applied voltage in symmetric salt conditions, reversal potentials that exceed the theoretical limit for a given salt concentration gradient). By comparison with current traces generated by other amphiphilic molecule known to spontaneously cross membranes, we hypothesize that DynA could directly translocate across neutral bilayers, a feature never observed in charged membranes following the same electrophysiological protocol. Our findings suggest that DynA interaction with the cellular membrane is modulated by the lipid charge distribution, enabling either passive ionic transport via membrane remodeling and pore formation or by peptide direct internalization independent of cellular transduction pathways.
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Affiliation(s)
- Laidy M Alvero-Gonzalez
- Laboratory of Molecular Biophysics, Department of Physics, University Jaume I, 12071 Castellón, Spain
| | - D Aurora Perini
- Laboratory of Molecular Biophysics, Department of Physics, University Jaume I, 12071 Castellón, Spain
| | - María Queralt-Martín
- Laboratory of Molecular Biophysics, Department of Physics, University Jaume I, 12071 Castellón, Spain
| | - Alex Perálvarez-Marín
- Biophysics Unit, Department of Biochemistry and Molecular Biology, School of Medicine, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Institute of Neuroscience, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain.
| | - Clara Viñas
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Antonio Alcaraz
- Laboratory of Molecular Biophysics, Department of Physics, University Jaume I, 12071 Castellón, Spain.
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2
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Stefanowska A, Koprowski P, Bednarczyk P, Szewczyk A, Krysinski P. Electrochemical studies of the mitochondrial ROMK2 potassium channel activity reconstituted into the free-standing and tethered bilayer lipid membranes. Bioelectrochemistry 2023; 151:108372. [PMID: 36680942 DOI: 10.1016/j.bioelechem.2023.108372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 01/11/2023] [Accepted: 01/12/2023] [Indexed: 01/18/2023]
Abstract
The renal-outer-medullary‑potassium (ROMK2) channel modulates potassium transport in the kidney. It has been postulated that the ROMK2 is the pore-forming subunit of the mitochondrial ATP-sensitive potassium channel as a mediator of cardioprotection. In this study, cell-free synthesis of the ROMK2 was performed in presence of membrane scaffold protein (MSP1D1) nanodiscs. Activity measurements were achieved after channel reconstitution into the planar lipid bilayer and tethered bilayer lipid membranes. Both methods allowed for monitoring of channel function, verified with channel blocking and activation/re-activation experiments. The primary function of the mitochondrial potassium channels is to regulate the potential of the mitochondrial membrane, which allows them to play an important role in cytoprotection. This work focuses on obtaining the ROMK2 using a cell-free expression system, followed by the incorporation of the channel protein into the lipid bilayer and studying the influence of voltage changes and molecular modulators on channel activity. Channel activity was measured after its reconstitution into two models of lipid bilayers - BLM (Bilayer Lipid Membrane) and tBLM (Tethered Bilayer Lipid Membrane) deposited on a solid gold electrode. These two model membranes and electrochemical measurements made it possible to measure the flux of K+ ions in the presence of channel modulators.
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Affiliation(s)
| | - Piotr Koprowski
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology PAS, Pasteur str. 3, Warsaw 02-093, Poland
| | - Piotr Bednarczyk
- Department of Physics and Biophysics, Warsaw University of Life Sciences (SGGW), Warsaw 02-78, Poland
| | - Adam Szewczyk
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology PAS, Pasteur str. 3, Warsaw 02-093, Poland
| | - Pawel Krysinski
- Faculty of Chemistry, University of Warsaw, 1 Pasteur Street, 02-093 Warsaw, Poland.
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3
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Kirsanov RS, Khailova LS, Rokitskaya TI, Iaubasarova IR, Nazarov PA, Panteleeva AA, Lyamzaev KG, Popova LB, Korshunova GA, Kotova EA, Antonenko YN. Ester-stabilized phosphorus ylides as protonophores on bilayer lipid membranes, mitochondria and chloroplasts. Bioelectrochemistry 2023; 150:108369. [PMID: 36638678 DOI: 10.1016/j.bioelechem.2023.108369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 12/19/2022] [Accepted: 01/03/2023] [Indexed: 01/06/2023]
Abstract
Triphenylphosphonium ylides are commonly used as key intermediates in the Wittig reaction. Based on the known acidities of stabilized ylide precursors, we proposed that a methylene group adjacent to phosphorus in these compounds can ensure proton shuttling across lipid membranes. Here, we synthesized (decyloxycarbonylmethyl)triphenylphosphonium bromide (CMTPP-C10) by reaction of triphenylphosphine with decyl bromoacetate. This phosphonium salt precursor of the ester-stabilized phosphorus ylide along with its octyl (CMTPP-C8) and dodecyl (CMTPP-C12) analogues was found to be a carrier of protons in mitochondrial, chloroplast and artificial lipid membranes, suggesting that it can reversibly release hydrogen ions and diffuse through the membranes in both zwitterionic (ylide) and cationic forms. The CMTPP-C10-mediated electrical current across planar bilayer lipid membranes exhibited pronounced proton selectivity. Similar to conventional protonophores, known to uncouple electron transport and ATP synthesis, CMTPP-Cn (n = 8, 10, 12) stimulated mitochondrial respiration, while decreasing membrane potential, at micromolar concentrations, thereby showing the classical uncoupling activity in mitochondria. CMTPP-C12 also caused dissipation of transmembrane pH gradient on chloroplast membranes. Importantly, CMTPP-C10 exhibited substantially lower toxicity in cell culture, than C12TPP. Thus, we report the finding of a new class of ylide-type protonophores, which is of substantial interest due to promising therapeutic properties of uncouplers.
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Affiliation(s)
- Roman S Kirsanov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Ljudmila S Khailova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Tatyana I Rokitskaya
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Iliuza R Iaubasarova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia; Faculty of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119991, Russia
| | - Pavel A Nazarov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Alisa A Panteleeva
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Konstantin G Lyamzaev
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia; The "Russian Clinical Research Center for Gerontology" of the Ministry of Healthcare of the Russian Federation, Pirogov Russian National Research Medical University, Moscow, Russia
| | - Lyudmila B Popova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Galina A Korshunova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Elena A Kotova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Yuri N Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia.
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Divya KP, Keerthana S, Viswanathan C, Ponpandian N. MXene supported biomimetic bilayer lipid membrane biosensor for zeptomole detection of BRCA1 gene. Mikrochim Acta 2023; 190:116. [PMID: 36877256 DOI: 10.1007/s00604-023-05694-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 02/08/2023] [Indexed: 03/07/2023]
Abstract
A biomimetic bilayer lipid membrane supported MXene based biosensor is reported for electrochemical hybridization detection of the most prevalent and potential BC biomarker BRCA1. 2D MXene nanosheet-anchored gold nanoparticle-decorated biomimetic bilayer lipid membrane (AuNP@BLM) biosensor is used for the attachment of thiolated single-stranded DNA (HS-ssDNA) targeting hybridization detection. The interaction of biomimetic bilayer lipid membrane with 2D MXene nanosheets is explored in this work for the first time. The synergistic combination of MXene and AuNP@BLM has proven to efficiently improve the detection signal to several folds. The sensor provides hybridization signals only to the complementary DNA (cDNA) sequence with a linearity range 10 zM to 1 µM and LOD of 1 zM without the need of any further amplification. The specificity of the biosensor is validated using non-complementary (ncDNA) and double base mis-match oligonucleotide DNA (dmmDNA) sequences. The sensor successfully distinguishes the signal for different target DNAs with good reproducibility indicated by the RSD value of 4.9%. Hence, we envision that the reported biosensor can be used to construct efficient diagnostic point-of-care tools based on molecular affinity interactions.
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Affiliation(s)
- Karutha Pandian Divya
- Bharathiar Cancer Theranostics Research Centre (BCTRC), RUSA 2.0, Bharathiar University, Coimbatore, 641 046, India.,Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641 046, India
| | | | | | - Nagamony Ponpandian
- Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641 046, India.
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Omatsu T, Hori K, Ishida N, Maeda K, Yoshida Y. Distribution of ion pairs into a bilayer lipid membrane and its effect on the ionic permeability. Biochim Biophys Acta Biomembr 2021; 1863:183724. [PMID: 34364888 DOI: 10.1016/j.bbamem.2021.183724] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 08/02/2021] [Accepted: 08/02/2021] [Indexed: 11/24/2022]
Abstract
This work reports the distribution constant of a target ion and a counter-ion between an aqueous phase and an artificial bilayer lipid membrane (BLM) and its influence to the ionic permeability through a BLM. A theoretical formula for ionic permeability through a BLM based on the distribution of the target ion and the counter-ion is also proposed and validated by analyzing the flux of a fluorescent cation [rhodamine 6G (R6G+)] through the BLM in the presence of counter-ions (X- = Br-, BF4-, and ClO4-). The transmembrane flux was evaluated by simultaneous measurement of the transmembrane current density and the transmembrane fluorescence intensity as a function of the membrane potential. The distribution constant of R6G+ and X- between the aqueous and BLM phases was determined by a liposome-extraction method. The measured ionic permeability exhibited non-linear dependent on the aqueous concentration of R6G+ or X-, but proportional to the concentration of R6G+ and X- inside the BLM evaluated from the distribution constant of R6G+ and X-. The proportionality demonstrates that the distribution of cations and anions between the aqueous and BLM phases dominates the flux of ion transport through the BLM. The proposed formula can express the dependence of the transmembrane current on the membrane potential and the concentrations of R6G+ and X- in the aqueous phase.
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Rokitskaya TI, Kotova EA, Antonenko YN. Anomalous potentials on bilayer lipid membranes in the presence of usnic acid: Markin-Sokolov versus Nernst-Donnan equilibrium. Bioelectrochemistry 2021; 141:107825. [PMID: 34030021 DOI: 10.1016/j.bioelechem.2021.107825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 04/13/2021] [Accepted: 04/16/2021] [Indexed: 11/28/2022]
Abstract
To gain insight into the mechanisms of ionophoric activity of usnic acid (UA), we examined the UA-induced generation of potentials on a planar bilayer lipid membrane (BLM) in the presence of concentration gradients of hydrogen and magnesium or calcium ions under open-circuit conditions. Remarkably, the BLM potential generated by UA at the proton concentration gradient of 1 pH unit was approximately twice the Nernst equilibrium level. With a concentration gradient of magnesium or calcium ions, the BLM potential generated by UA had the opposite sign. The observed anomalies in the membrane potentials were consistent with a theory developed by Markin and Sokolov (Bioelectrochem. Bioenerg. 1990) for the case of ionophore-mediated coupled fluxes of several ions across a membrane.
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Affiliation(s)
- Tatyana I Rokitskaya
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Elena A Kotova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Yuri N Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia.
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7
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Rokitskaya TI, Kotova EA, Luzhkov VB, Kirsanov RS, Aleksandrova EV, Korshunova GA, Tashlitsky VN, Antonenko YN. Lipophilic ion aromaticity is not important for permeability across lipid membranes. Biochim Biophys Acta Biomembr 2020; 1863:183483. [PMID: 33002452 DOI: 10.1016/j.bbamem.2020.183483] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 08/31/2020] [Accepted: 09/22/2020] [Indexed: 12/23/2022]
Abstract
To clarify the contribution of charge delocalization in a lipophilic ion to the efficacy of its permeation through a lipid membrane, we compared the behavior of alkyl derivatives of triphenylphosphonium, tricyclohexylphosphonium and trihexylphosphonium both in natural and artificial membranes. Exploring accumulation of the lipophilic cations in response to inside-negative membrane potential generation in mitochondria by using an ion-selective electrode revealed similar mitochondrial uptake of butyltricyclohexylphosphonium (C4TCHP) and butyltriphenylphosphonium (C4TPP). Fluorescence correlation spectroscopy also demonstrated similar membrane potential-dependent accumulation of fluorescein derivatives of tricyclohexyldecylphosphonium and decyltriphenylphosphonium in mitochondria. The rate constant of lipophilic cation translocation across the bilayer lipid membrane (BLM), measured by the current relaxation method, moderately increased in the following sequence: trihexyltetradecylphosphonium ([P6,6,6,14]) < triphenyltetradecylphosphonium (C14TPP) < tricyclohexyldodecylphosphonium (C12TCHP). In line with these results, measurements of the BLM stationary conductance indicated that membrane permeability for C4TCHP is 2.5 times higher than that for C4TPP. Values of the difference in the free energy of ion solvation in water and octane calculated using the density functional theory and the polarizable continuum solvent model were similar for methyltriphenylphosphonium, tricyclohexylmethylphosphonium and trihexylmethylphosphonium. Our results prove that both cyclic and aromatic moieties are not necessary for lipophilic ions to effectively permeate through lipid membranes.
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Affiliation(s)
- Tatyana I Rokitskaya
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow 119991, Russia.
| | - Elena A Kotova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Victor B Luzhkov
- Department of Kinetics of Chemical and Biological Processes, Institute of Problems of Chemical Physics, Russian Academy of Sciences, acad. Semenov av. 1, Chernogolovka, Moscow Region 142432, Russia; Department of Fundamental Physical and Chemical Engineering, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Roman S Kirsanov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow 119991, Russia
| | | | - Galina A Korshunova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Vadim N Tashlitsky
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Yuri N Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow 119991, Russia
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8
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Firsov AM, Popova LB, Khailova LS, Nazarov PA, Kotova EA, Antonenko YN. Protonophoric action of BAM15 on planar bilayers, liposomes, mitochondria, bacteria and neurons. Bioelectrochemistry 2020; 137:107673. [PMID: 32971482 DOI: 10.1016/j.bioelechem.2020.107673] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 09/04/2020] [Accepted: 09/07/2020] [Indexed: 12/30/2022]
Abstract
Small molecules capable of uncoupling respiration and ATP synthesis in mitochondria are protective towards various cell malfunctions. Recently (2-fluorophenyl){6-[(2-fluorophenyl)amino](1,2,5-oxadiazolo[3,4-e]pyrazin-5-yl)}amine (BAM15), a new compound of this type, has become popular as a potent mitochondria-selective depolarizing agent producing minimal adverse effects. To validate protonophoric mechanism of BAM15 action, we examined its behavior in bilayer lipid membranes (BLM). BAM15 proved to be a typical anionic protonophore with the activity on planar membranes being suppressed upon decreasing membrane dipole potential. In both planar BLM and liposomes, BAM15 induced proton conductance with the potency close to that of the classical protonophoric uncoupler carbonyl cyanide m-chlorophenyl hydrazone (CCCP). In isolated rat liver mitochondria (RLM), BAM15 caused membrane potential collapse, increased respiration rate and induced Ca2+ efflux at concentrations slightly higher than those for CCCP. Surprisingly, the uncoupling action of BAM15 on isolated RLM, in contrast to that of CCCP, was partially reversed by carboxyatractyloside (CATR), an inhibitor of adenine nucleotide translocase, thereby indicating involvement of this protein in the BAM15-induced uncoupling. BAM15 inhibited growth of Bacillus subtilis at micromolar concentrations. In electrophysiological experiments on molluscan neurons, BAM15 caused plasma membrane depolarization and suppression of electrical activity, but the effect developed more slowly than that of CCCP.
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Affiliation(s)
- Alexander M Firsov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Lyudmila B Popova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Ljudmila S Khailova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Pavel A Nazarov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Elena A Kotova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Yuri N Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia.
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9
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Shchelkonogov VA, Alyaseva SO, Lotosh NY, Baranova OA, Chekanov AV, Solov'eva EY, Kamyshinskii RA, Vasilov RG, Shastina NS, Korepanova EA, Anosov AA, Selishcheva AA. Lipoic acid nanoforms based on phosphatidylcholine: production and characteristics. Eur Biophys J 2019; 49:95-103. [PMID: 31865397 DOI: 10.1007/s00249-019-01415-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 10/16/2019] [Accepted: 12/11/2019] [Indexed: 11/30/2022]
Abstract
We describe the dynamics of lipoic acid (LA) alone, incorporated in liposomes and as a part of nanoemulsions. Mass spectrometry shows that LA in water forms aggregates of two or three molecules in the form of a negatively charged ion and a neutral molecule. Phosphatidylcholine (PC)-based nanoforms of LA as liposomes and nanoemulsions with a particle size equal to 145 nm are characterized by a high degree of incorporation of LA into the nanoparticles and long-term stability during storage at room temperature. Dynamic light scattering (DLS) gives the polydispersity index of the nanoforms (> 0.3), characterizing the homogeneity of the obtained nanodispersions. We found that such emulsions can significantly (5 ×) increase the concentration of LA in the aqueous phase (5-7 mg/mL) when compared with an aqueous solution of LA (1 mg/mL) and by 40% when compared with PC liposomes (4 mg/mL). Moreover, the inclusion of LA in liposomes and nanoemulsions from PC did not change the neutral ζ-potential characteristic of PC nanoforms. CryoTEM established that the structural organization of the liposomes practically did not differ from nanoemulsions and both nanoforms contained both multilayer and single-layer vesicles. When studying the release kinetics of LA from phosphatidylcholine nanoforms, we found that at 22 h, 45-55% of LA was released from nanoparticles, but that at the initial stage of the process LA was slowly released from the nanoemulsions and rapidly from the liposomes. Conductance measurements indicate that LA delivered in all the three forms increase membrane permeability, though this result is most marked with the LA in PC liposomes.
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Affiliation(s)
- V A Shchelkonogov
- MIREA-Russian Technological University, Moscow, 119571, Russia.,Pirogov Russian National Research Medical University, Russian Ministry of Public Health, Moscow, 117997, Russia
| | - S O Alyaseva
- MIREA-Russian Technological University, Moscow, 119571, Russia
| | - N Yu Lotosh
- National Research Center Kurchatov Institute, Moscow, 123182, Russia
| | - O A Baranova
- Pirogov Russian National Research Medical University, Russian Ministry of Public Health, Moscow, 117997, Russia
| | - A V Chekanov
- Pirogov Russian National Research Medical University, Russian Ministry of Public Health, Moscow, 117997, Russia.
| | - E Yu Solov'eva
- Pirogov Russian National Research Medical University, Russian Ministry of Public Health, Moscow, 117997, Russia
| | - R A Kamyshinskii
- National Research Center Kurchatov Institute, Moscow, 123182, Russia
| | - R G Vasilov
- National Research Center Kurchatov Institute, Moscow, 123182, Russia
| | - N S Shastina
- MIREA-Russian Technological University, Moscow, 119571, Russia
| | - E A Korepanova
- Pirogov Russian National Research Medical University, Russian Ministry of Public Health, Moscow, 117997, Russia.,Sechenov First Moscow State Medical University (Sechenov University), Moscow, 119991, Russia
| | - A A Anosov
- Sechenov First Moscow State Medical University (Sechenov University), Moscow, 119991, Russia
| | - A A Selishcheva
- National Research Center Kurchatov Institute, Moscow, 123182, Russia.,Department of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia.,Pirogov Russian National Research Medical University, Russian Ministry of Public Health, Moscow, 117997, Russia
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Abstract
Liquid crystals have certain physical properties that promote chemical reactions which cannot occur in bulk phase media. These properties are displayed, among other molecules, by amphiphilic compounds which assemble into membrane structures then concentrate and organize biologically relevant monomers within their confined spaces. When mixtures of lipids and nucleotides are cycled multiple times between hydrated and anhydrous conditions, the monomers polymerize in the dry phase into oligonucleotides. Upon rehydration, mixtures of the polymers are encapsulated in lipid-bounded compartments called protocells. Reactions in liquid crystalline organizing matrices represent a promising approach for future research on how primitive cells could emerge on the early Earth and other habitable planets.
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11
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Rokitskaya TI, Khailova LS, Makarenkov AV, Shunaev AV, Tatarskiy VV, Shtil AA, Ol'shevskaya VA, Antonenko YN. Carborane derivatives of 1,2,3-triazole depolarize mitochondria by transferring protons through the lipid part of membranes. Biochim Biophys Acta Biomembr 2018; 1861:573-583. [PMID: 30562498 DOI: 10.1016/j.bbamem.2018.12.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 12/10/2018] [Accepted: 12/13/2018] [Indexed: 10/27/2022]
Abstract
Boron containing polyhedra (carboranes) are three-dimensional delocalized aromatic systems. These structures have been shown to transport protons through lipid membranes and mitochondria. Conjugation of carboranes to various organic moieties is aimed at obtaining biologically active compounds with novel properties. Taking advantage of 1,2,3-triazoles as the scaffolds valuable in medicinal chemistry, we synthesized 1-(o-carboranylmethyl)-4-pentyl-1,2,3-triazole (c-triazole) and 1-(o-carboranylmethyl)-4-pentyl-1,2,3-triazolium iodide (c-triazolium). Both compounds interacted with model lipid membranes and exhibited a proton carrying activity in planar bilayers and liposomes in a concentration- and pH-dependent manner. Importantly, mechanisms of the protonophoric activity differed; namely, protonation-deprotonation reactions of the triazole and the o-carborane moieties were involved in the transport cycles of c-triazole and c-triazolium, respectively. At micromolar concentrations, c-triazole and c-triazolium stimulated respiration of isolated rat liver mitochondria and depolarized their membrane potential, with c-triazole being more potent. In living K562 (human chronic myelogenous leukemia) cells, both c-triazolium and c-triazole altered the mitochondrial membrane potential as determined by a decreased intracellular accumulation of the potential-dependent dye tetramethylrhodamine ethyl ester. Finally, cell viability testing demonstrated a cytotoxic potency of c-triazolium and, to a lesser extent, of c-triazole against K562 cells, whereas non-malignant fibroblasts were much less sensitive. In all tests, the reference boron-free benzyl-4-pentyl-1,2,3-triazole showed little-to-no effects. These results demonstrated that carboranyltriazoles carry protons across biological membranes, a property potentially important in anticancer drug design.
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Affiliation(s)
- Tatyana I Rokitskaya
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation.
| | - Ljudmila S Khailova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Anton V Makarenkov
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russian Federation
| | - Alexei V Shunaev
- Blokhin National Medical Research Center of Oncology, Moscow, Russian Federation
| | - Victor V Tatarskiy
- Blokhin National Medical Research Center of Oncology, Moscow, Russian Federation; National University of Science and Technology "MISiS", 4 Leninskiy Prospekt, Moscow 119049, Russian Federation
| | - Alexander A Shtil
- Blokhin National Medical Research Center of Oncology, Moscow, Russian Federation
| | - Valentina A Ol'shevskaya
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russian Federation
| | - Yuri N Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation.
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Schulze Greiving VC, de Boer HL, Bomer JG, van den Berg A, Le Gac S. Integrated microfluidic biosensing platform for simultaneous confocal microscopy and electrophysiological measurements on bilayer lipid membranes and ion channels. Electrophoresis 2017; 39:496-503. [PMID: 29193178 DOI: 10.1002/elps.201700346] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 11/04/2017] [Accepted: 11/05/2017] [Indexed: 01/19/2023]
Abstract
Combining high-resolution imaging and electrophysiological recordings is key for various types of experimentation on lipid bilayers and ion channels. Here, we propose an integrated biosensing platform consisting of a microfluidic cartridge and a dedicated chip-holder to conduct such dual measurements on suspended lipid bilayers, in a user-friendly manner. To illustrate the potential of the integrated platform, we characterize lipid bilayers in terms of thickness and fluidity while simultaneously monitoring single ion channel currents. For that purpose, POPC lipid bilayers are supplemented with a fluorescently-tagged phospholipid (NBD-PE, 1% mol) for Fluorescence Recovery After Photobleaching (FRAP) measurements and a model ion channel (gramicidin, 1 nM). These combined measurements reveal that NBD-PE has no effect on the lipid bilayer thickness while gramicidin induces thinning of the membrane. Furthermore, the presence of gramicidin does not alter the lipid bilayer fluidity. Surprisingly, in lipid bilayers supplemented with both probes, a reduction in gramicidin open probability and lifetime is observed compared to lipid bilayers with gramicidin only, suggesting an influence of NBD-PE on the gramicidin ion function. Altogether, our proposed microfluidic biosensing platform in combination with the herein presented multi-parametric measurement scheme paves the way to explore the interdependent relationship between lipid bilayer properties and ion channel function.
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Affiliation(s)
- Verena C Schulze Greiving
- BIOS, Lab on a chip Group, MESA+ Institute for Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Enschede, The Netherlands
| | - Hans L de Boer
- BIOS, Lab on a chip Group, MESA+ Institute for Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Enschede, The Netherlands
| | - Johan G Bomer
- BIOS, Lab on a chip Group, MESA+ Institute for Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Enschede, The Netherlands
| | - Albert van den Berg
- BIOS, Lab on a chip Group, MESA+ Institute for Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Enschede, The Netherlands
| | - Séverine Le Gac
- BIOS, Lab on a chip Group, MESA+ Institute for Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Enschede, The Netherlands
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Rokitskaya TI, Antonenko YN. Fullerenol C60(OH)24 increases ion permeability of lipid membranes in a pH-dependent manner. Biochim Biophys Acta 2016; 1858:1165-74. [PMID: 26874205 DOI: 10.1016/j.bbamem.2016.02.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 01/07/2016] [Accepted: 02/09/2016] [Indexed: 02/07/2023]
Abstract
Fullerenols are water-soluble analogs of fullerene exhibiting both antioxidant and prooxidant activities in vitro and in vivo. Here we report, for the first time, that fullerenol C60(OH)24 can induce ion permeability of a planar lipid bilayer membrane via the formation of ion pores or conductive defects with a preference for cations over anions. The fullerenol-mediated electrical current displayed non-linear concentration dependence and was reversibly enhanced by alkalinization. Calcium and magnesium ions decreased the fullerenol-induced potassium ion permeability. Voltage dependence of the current was sensitive to membrane composition, with the conductance being well pronounced in fully saturated diphytanoylphosphatidylcholine. Fullerenol did not induce carboxyfluorescein leakage from liposomes, suggesting a small size of fullerenol-induced pores. In contrast to ion permeability, the binding of C60(OH)24 to liposomes increased at acidic pH, as measured by fluorescence quenching of pyrene-labeled lipid. In line with this, the photodynamic action of fullerenol on the peptide gramicidin A also increased at low pH. It is hypothesized that aggregates of fullerenol may stabilize transient conductive lipid defects or pores formed under a variety of stress conditions.
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Affiliation(s)
- Tatyana I Rokitskaya
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
| | - Yuri N Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
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Ghasemi M, Khodaei N, Salari S, Eliassi A, Saghiri R. Gating behavior of endoplasmic reticulum potassium channels of rat hepatocytes in diabetes. Iran Biomed J 2015; 18:165-72. [PMID: 24842143 PMCID: PMC4048481 DOI: 10.6091/ibj.1308.2014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Defects in endoplasmic reticulum homeostasis are common occurrences in different diseases, such as diabetes, in which the function of endoplasmic reticulum is disrupted. It is now well established that ion channels of endoplasmic reticulum membrane have a critical role in endoplasmic reticulum luminal homeostasis. Our previous studies showed the presence of an ATP-sensitive cationic channel in endoplasmic reticulum. Therefore, in this study, we examined and compared the activities of this channel in control and diabetic rats using single-channel recording techniques. METHOD Male Wistar rats were made diabetic for 2 weeks with a single dose injection of streptozotocin (45 mg/kg). Ion channel incorporation of rough endoplasmic reticulum of diabetic hepatocytes into the bilayer lipid membrane allowed the characterization of K+ channel. RESULTS Ion channel incorporation of rough endoplasmic reticulum vesicles into the bilayer lipid revealed that the channel current-voltage (I-V) relation with a mean slope conductance of 520 ± 19 pS was unaffected in diabetes. Interestingly, the channel Po-voltage relation was significantly lower in diabetic rats at voltages above +30 mV. CONCLUSION We concluded that the endoplasmic reticulum cationic channel is involved in diabetes. Also, this finding could be considered as a goal for further therapeutic plans.
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Affiliation(s)
- Maedeh Ghasemi
- Neurophysiology Research Center, Shahid Beheshti University of Medical Sciences, Evin, Tehran 19857, Iran
| | - Naser Khodaei
- Dept. of Physiology, Shahid Beheshti University of Medical Sciences, Evin, Tehran 19857, Iran
| | - Sajjad Salari
- Dept. of Physiology, Ilam University of Medical Sciences, Ilam, Iran
| | - Afsaneh Eliassi
- Neurophysiology Research Center, Shahid Beheshti University of Medical Sciences, Evin, Tehran 19857, Iran.,Dept. of Physiology, Shahid Beheshti University of Medical Sciences, Evin, Tehran 19857, Iran.,Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Evin, Tehran 19857, Iran
| | - Reza Saghiri
- Dept. of Biochemistry, Pasteur Institute of Iran, Tehran, Iran
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Rokitskaya TI, Kotova EA, Agapov II, Moisenovich MM, Antonenko YN. Unsaturated lipids protect the integral membrane peptide gramicidin A from singlet oxygen. FEBS Lett 2014; 588:1590-5. [PMID: 24613917 DOI: 10.1016/j.febslet.2014.02.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 02/10/2014] [Accepted: 02/17/2014] [Indexed: 10/25/2022]
Abstract
In contrast to expectations that unsaturated fatty acids contribute to oxidative stress by providing a source of lipid peroxides, we demonstrated the protective effect of double bonds in lipids on oxidative damage to membrane proteins. Photodynamic inactivation of gramicidin channels was decreased in unsaturated lipid compared to saturated lipid bilayers. By estimating photosensitizer (boronated chlorine e6 amide) binding to the membrane with the current relaxation technique, the decrease in gramicidin photoinactivation was attributed to singlet oxygen scavenging by double bonds in lipids rather than to the reduction in photosensitizer binding. Gramicidin protection by unsaturated lipids was also observed upon induction of oxidative stress with tert-butyl hydroperoxide.
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Affiliation(s)
- Tatyana I Rokitskaya
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation.
| | - Elena A Kotova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Igor I Agapov
- Biological Department, Lomonosov Moscow State University, Moscow, Russian Federation; Academician V.I.Shumakov Federal Research Center of Transplantology and Artificial Organs, Moscow, Russian Federation
| | - Mikhail M Moisenovich
- Biological Department, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Yuri N Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation
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Naumowicz M, Petelska AD, Figaszewski ZA. Electrochemical impedance spectroscopy as a method for electrical characterization of the bilayers formed from lipid-amino acid systems. Chem Phys Lipids 2013; 175-176:116-22. [PMID: 24055996 DOI: 10.1016/j.chemphyslip.2013.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 07/29/2013] [Accepted: 09/04/2013] [Indexed: 10/26/2022]
Abstract
Bilayer lipid membranes composed of phosphatidylcholine and isoleucine or phosphatidylcholine and tyrosine were investigated using electrochemical impedance spectroscopy. Interaction between membrane components causes significant deviations from the additivity rule which can be explained by formation of the domain structures. The surface area of domains was calculated based on derived equations. We suggest that the stoichiometry of phosphatidylcholine-isoleucine domain is equal 3:1. In the case of tyrosine-modified phosphatidylcholine membranes, domain with stoichiometry 7:1 should be taken into consideration.
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Affiliation(s)
- Monika Naumowicz
- Institute of Chemistry, University of Bialystok, Al. J. Pilsudskiego 11/4, 15-443 Bialystok, Poland.
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