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Zambrano P, Manrique-Moreno M, Petit K, Colina JR, Jemiola-Rzeminska M, Suwalsky M, Strzalka K. Differential scanning calorimetry in drug-membrane interactions. Biochem Biophys Res Commun 2024; 709:149806. [PMID: 38579619 DOI: 10.1016/j.bbrc.2024.149806] [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: 09/22/2023] [Revised: 03/04/2024] [Accepted: 03/18/2024] [Indexed: 04/07/2024]
Abstract
Differential Scanning Calorimetry (DSC) is a central technique in investigating drug - membrane interactions, a critical component of pharmaceutical research. DSC measures the heat difference between a sample of interest and a reference as a function of temperature or time, contributing essential knowledge on the thermally induced phase changes in lipid membranes and how these changes are affected by incorporating pharmacological substances. The manuscript discusses the use of phospholipid bilayers, which can form structures like unilamellar and multilamellar vesicles, providing a simplified yet representative membrane model to investigate the complex dynamics of how drugs interact with and penetrate cellular barriers. The manuscript consolidates data from various studies, providing a comprehensive understanding of the mechanisms underlying drug - membrane interactions, the determinants that influence these interactions, and the crucial role of DSC in elucidating these components. It further explores the interactions of specific classes of drugs with phospholipid membranes, including non-steroidal anti-inflammatory drugs, anticancer agents, natural products with antioxidant properties, and Alzheimer's disease therapeutics. The manuscript underscores the critical importance of DSC in this field and the need for continued research to improve our understanding of these interactions, acting as a valuable resource for researchers.
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Affiliation(s)
- Pablo Zambrano
- Department of Bioscience, School of Natural Sciences, Technical University of Munich, Lichtenbergstrasse 4, 85748, Garching, Germany.
| | - Marcela Manrique-Moreno
- Faculty of Natural of Exact Sciences, Chemistry Institute, University of Antioquia, A.A. 1226, Medellin, 050010, Antioquia, Colombia
| | - Karla Petit
- LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, Concepción, Chile
| | - José R Colina
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Lientur 1457, Concepción 4080871, Chile
| | - Malgorzata Jemiola-Rzeminska
- Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland
| | - Mario Suwalsky
- Facultad de Medicina, Universidad Católica de La Santísima Concepción, Concepción, Chile
| | - Kazimierz Strzalka
- Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland.
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Zambrano P, Jemiola-Rzeminska M, Muñoz-Torrero D, Suwalsky M, Strzalka K. A rhein-huprine hybrid protects erythrocyte membrane integrity against Alzheimer's disease related Aβ(1-42) peptide. Biophys Chem 2023; 300:107061. [PMID: 37307659 DOI: 10.1016/j.bpc.2023.107061] [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: 04/18/2023] [Revised: 05/26/2023] [Accepted: 06/02/2023] [Indexed: 06/14/2023]
Abstract
Alzheimer's disease remains largely unknown, and currently there is no complete cure for the disease. New synthetic approaches have been developed to create multi-target agents, such as RHE-HUP, a rhein-huprine hybrid which can modulate several biological targets that are relevant to the development of the disease. While RHE-HUP has shown in vitro and in vivo beneficial effects, the molecular mechanisms by which it exerts its protective effect on cell membranes have not been fully clarified. To better understand RHE-HUP interactions with cell membranes, we used synthetic membrane models and natural models of human membranes. For this purpose, human erythrocytes and molecular model of its membrane built-up of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE) were used. The latter correspond to classes of phospholipids present in the outer and inner monolayers of the human erythrocyte membrane, respectively. X-ray diffraction and differential scanning calorimetry (DSC) results indicated that RHE-HUP was able to interact mainly with DMPC. In addition, scanning electron microscopy (SEM) analysis showed that RHE-HUP modified the normal biconcave shape of erythrocytes inducing the formation of echinocytes. Moreover, the protective effect of RHE-HUP against the disruptive effect of Aβ(1-42) on the studied membrane models was tested. X-ray diffraction experiments showed that RHE-HUP induced a recovery in the ordering of DMPC multilayers after the disruptive effect of Aβ(1-42), confirming the protective role of the hybrid.
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Affiliation(s)
- Pablo Zambrano
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile.
| | - Malgorzata Jemiola-Rzeminska
- Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland
| | - Diego Muñoz-Torrero
- Laboratory of Medicinal Chemistry (CSIC Associated Unit), Faculty of Pharmacy and Food Sciences, University of Barcelona, Barcelona, Spain; Institute of Biomedicine (IBUB), University of Barcelona, Barcelona, Spain
| | - Mario Suwalsky
- Facultad de Medicina, Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Kazimierz Strzalka
- Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland
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Colina JR, Suwalsky M, Petit K, Contreras D, Manrique-Moreno M, Jemiola-Rzeminska M, Strzalka K. In vitro evaluation of the protective effect of crocin on human erythrocytes. Biophys Chem 2021; 281:106738. [PMID: 34920397 DOI: 10.1016/j.bpc.2021.106738] [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: 07/17/2021] [Revised: 12/04/2021] [Accepted: 12/05/2021] [Indexed: 11/02/2022]
Abstract
The interactions and the protective effect of the carotenoid crocin (CRO) on human erythrocytes (RBC) and molecular models of its membrane were investigated. The latter consisted of bilayers of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE), representative of phospholipid classes located in the outer and inner monolayers of the RBC membrane, respectively. X-ray diffraction, differential scanning calorimetry (DSC) and electronic paramagnetic resonance spectroscopy (EPR) showed that CRO produced structural perturbations in DMPC bilayers and in isolated unsealed human erythrocyte membranes. On the other hand, scanning electron microscopy (SEM) showed that CRO induced shape changes in the RBC from their normal discoid form to echinocytes. This result indicates that the CRO molecules were mainly localized in the outer monolayer of the RBC membrane. The assessment of the protective capacity of CRO was revealed by the carotenoid inhibition of the morphological alterations caused by hypochlorous acid (HOCl) to RBC.
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Affiliation(s)
- José R Colina
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile.
| | - Mario Suwalsky
- Facultad de Medicina, Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Karla Petit
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile
| | - David Contreras
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile
| | | | - Malgorzata Jemiola-Rzeminska
- Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Kazimierz Strzalka
- Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
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Zambrano P, Suwalsky M, Jemiola-Rzeminska M, Gallardo-Nelson MJ, Strzalka K, Muñoz-Torrero D. Protective Role of a Donepezil-Huprine Hybrid against the β-Amyloid (1-42) Effect on Human Erythrocytes. Int J Mol Sci 2021; 22:ijms22179563. [PMID: 34502472 PMCID: PMC8431064 DOI: 10.3390/ijms22179563] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 08/27/2021] [Accepted: 08/31/2021] [Indexed: 12/17/2022] Open
Abstract
Aβ(1-42) peptide is a neurotoxic agent strongly associated with the etiology of Alzheimer's disease (AD). Current treatments are still of very low effectiveness, and deaths from AD are increasing worldwide. Huprine-derived molecules have a high affinity towards the enzyme acetylcholinesterase (AChE), act as potent Aβ(1-42) peptide aggregation inhibitors, and improve the behavior of experimental animals. AVCRI104P4 is a multitarget donepezil-huprine hybrid that improves short-term memory in a mouse model of AD and exerts protective effects in transgenic Caenorhabditis elegans that express Aβ(1-42) peptide. At present, there is no information about the effects of this compound on human erythrocytes. Thus, we considered it important to study its effects on the cell membrane and erythrocyte models, and to examine its protective effect against the toxic insult induced by Aβ(1-42) peptide in this cell and models. This research was developed using X-ray diffraction and differential scanning calorimetry (DSC) on molecular models of the human erythrocyte membrane constituted by lipid bilayers built of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE). They correspond to phospholipids representative of those present in the external and internal monolayers, respectively, of most plasma and neuronal membranes. The effect of AVCRI104P4 on human erythrocyte morphology was studied by scanning electron microscopy (SEM). The experimental results showed a protective effect of AVCRI104P4 against the toxicity induced by Aβ(1-42) peptide in human erythrocytes and molecular models.
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Affiliation(s)
- Pablo Zambrano
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción 4030000, Chile
- Correspondence: ; Tel.: +49-89-8578-2374
| | - Mario Suwalsky
- Facultad de Medicina, Universidad Católica de la Santísima Concepción, Concepción 4030000, Chile;
| | - Malgorzata Jemiola-Rzeminska
- Malopolska Centre of Biotechnology, Jagiellonian University, 30-387 Kraków, Poland; (M.J.-R.); (K.S.)
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Kraków, Poland
| | | | - Kazimierz Strzalka
- Malopolska Centre of Biotechnology, Jagiellonian University, 30-387 Kraków, Poland; (M.J.-R.); (K.S.)
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Kraków, Poland
| | - Diego Muñoz-Torrero
- Laboratory of Medicinal Chemistry (CSIC Associated Unit), Faculty of Pharmacy and Food, Sciences, University of Barcelona (UB), E-08028 Barcelona, Spain;
- Institute of Biomedicine (IBUB), University of Barcelona (UB), E-08028 Barcelona, Spain
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Manrique-Moreno M, Suwalsky M, Patiño-González E, Fandiño-Devia E, Jemioła-Rzemińska M, Strzałka K. Interaction of the antimicrobial peptide ∆M3 with the Staphylococcus aureus membrane and molecular models. Biochim Biophys Acta Biomembr 2020; 1863:183498. [PMID: 33157098 DOI: 10.1016/j.bbamem.2020.183498] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 09/22/2020] [Accepted: 10/12/2020] [Indexed: 11/18/2022]
Abstract
Staphylococcus aureus is one of the most pathogenic bacteria; infections with it are associated with significant morbidity and mortality in health care facilities. Antimicrobial peptides are a promising next generation antibiotic with great potential against bacterial infections. In this study, evidence is presented of the biological and biophysical properties of the novel synthetic peptide ΔM3. Its antimicrobial activity against the ATCC 25923 and methicillin-resistant S. aureus strains was evaluated. The results showed that ΔM3 has activity in the same μM range as vancomycin. Biophysical studies were performed with palmitoyloleoylphosphatidylglycerol and cardiolipin liposomes loaded with calcein and used to follow the lytic activity of the peptide by fluorescence spectroscopy. On the other hand, ΔM3 was induced to interact with molecular models of the erythrocyte membrane buil-up of dimiristoylphosphatidylcholine and dimyristoylphosphatidylethanolamine, representative lipids of the outer and inner monolayers of the human erythrocyte membrane, respectively. The capacity of ΔM3 to interact with the bacteria and erythrocyte model membranes was also evaluated by X-ray diffraction and differential scanning calorimetry. The morphological changes induced by the peptide to human erythrocytes were observed by scanning electron microscopy. Results with these techniques indicated that ΔM3 interacted with the inner monolayer of the erythrocyte membrane, which is rich in anionic lipids. Additionally, the cytotoxic effects of ΔM3 on red blood cells were evaluated by monitoring the hemoglobin release from erythrocytes. The results obtained from these different approaches showed ΔM3 to be a non-cytotoxic peptide with antibacterial activity.
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Affiliation(s)
| | - Mario Suwalsky
- Facultad de Medicina, Universidad Católica de la Santísima Concepción, Concepción, Chile
| | | | | | - Małgorzata Jemioła-Rzemińska
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland; Malopolska Centre of Biotechnology, JagiellonianUniversity, Krakow, Poland
| | - Kazimierz Strzałka
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland; Malopolska Centre of Biotechnology, JagiellonianUniversity, Krakow, Poland
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Aguiñiga-Sánchez I, Soto-Hernández M, Cadena-Iñiguez J, Suwalsky M, Colina JR, Castillo I, Rosado-Pérez J, Mendoza-Núñez VM, Santiago-Osorio E. Phytochemical Analysis and Antioxidant and Anti-Inflammatory Capacity of the Extracts of Fruits of the Sechium Hybrid. Molecules 2020; 25:molecules25204637. [PMID: 33053734 PMCID: PMC7587193 DOI: 10.3390/molecules25204637] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 09/16/2020] [Accepted: 10/02/2020] [Indexed: 11/16/2022] Open
Abstract
In addition to their own antioxidants, human cells feed on external antioxidants, such as the phenolic compounds of fruits and vegetables, which work together to keep oxidative stress in check. Sechium edule, an edible species of chayote, has phenolic compounds with antioxidant activity and antineoplastic activity. A Sechium hybrid shows one thousand times greater antineoplastic activity than edible species, but its antioxidant and anti-inflammatory activities and the content of phenolic compounds are unknown. The aim of this study was to determine the antioxidant and anti-inflammatory capacity of the extract of fruits of the Sechium hybrid in vitro and in vivo. Phytochemical analysis using HPLC showed that the extract of the Sechium hybrid has at least 16 phenolic compounds; galangin, naringenin, phloretin and chlorogenic acid are the most abundant. In an in vitro assay, this extract inhibited 2,2-diphenyl-L-picrylhydrazyl (DPPH) activity and protected the dimyristoylphosphatidylethanolamine (DMPE) phospholipid model cell membrane from oxidation mediated by hypochlorous acid (HClO). In vivo, it was identified that the most abundant metabolites in the extract enter the bloodstream of the treated mice. On the other hand, the extract reduces the levels of tumor necrosis factor alpha (TNFα), interferon gamma (IFNγ), and interleukin-6 (IL-6) but increases interleukin-10 (IL-10) and glutathione peroxidase levels. Our findings indicate that intake of the fruits of the Sechium hybrid leads to antioxidant and anti-inflammatory effects in a mouse model. Therefore, these results support the possibility of exploring the clinical effect of this hybrid in humans.
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Affiliation(s)
- Itzen Aguiñiga-Sánchez
- Hematopoiesis and Leukemia Laboratory, Research Unit on Cell Differentiation and Cancer, FES Zaragoza, National Autonomous University of Mexico, 09230 Mexico City, Mexico;
- Interdisciplinary Research Group of Sechium edule in Mexico (GISeM), Texcoco, Agustín Melgar 10 Street, 56153 Texcoco, Mexico; (M.S.-H.); (J.C.-I.)
| | - Marcos Soto-Hernández
- Interdisciplinary Research Group of Sechium edule in Mexico (GISeM), Texcoco, Agustín Melgar 10 Street, 56153 Texcoco, Mexico; (M.S.-H.); (J.C.-I.)
- Postgraduate College, Campus Montecillo, Km 36.5 Mexico-Texcoco Highway, 56230 Texcoco, Mexico
| | - Jorge Cadena-Iñiguez
- Interdisciplinary Research Group of Sechium edule in Mexico (GISeM), Texcoco, Agustín Melgar 10 Street, 56153 Texcoco, Mexico; (M.S.-H.); (J.C.-I.)
- Postgraduate College, Campus San Luis Potosí, Iturbide No. 73 Street, Salinas de Hidalgo, 78600 San Luis Potosí, Mexico
| | - Mario Suwalsky
- Facultad de Medicina, Universidad Católica de la Santísima Concepción, 4090541 Concepción, Chile;
| | - José R. Colina
- Facultad de Ciencias Químicas, Universidad de Concepción, 4070386 Concepción, Chile;
| | - Ivan Castillo
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, 04510 Mexico City, Mexico;
| | - Juana Rosado-Pérez
- Research Unit on Gerontology, FES Zaragoza, National Autonomous University of Mexico, 09230 Mexico City, Mexico;
| | - Víctor M. Mendoza-Núñez
- Research Unit on Gerontology, FES Zaragoza, National Autonomous University of Mexico, 09230 Mexico City, Mexico;
- Correspondence: (V.M.M.-N.); (E.S.-O.)
| | - Edelmiro Santiago-Osorio
- Hematopoiesis and Leukemia Laboratory, Research Unit on Cell Differentiation and Cancer, FES Zaragoza, National Autonomous University of Mexico, 09230 Mexico City, Mexico;
- Interdisciplinary Research Group of Sechium edule in Mexico (GISeM), Texcoco, Agustín Melgar 10 Street, 56153 Texcoco, Mexico; (M.S.-H.); (J.C.-I.)
- Correspondence: (V.M.M.-N.); (E.S.-O.)
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Petit K, Suwalsky M, Colina JR, Contreras D, Aguilar LF, Jemiola-Rzeminska M, Strzalka K. Toxic effects of the anticancer drug epirubicin in vitro assayed in human erythrocytes. Toxicol In Vitro 2020; 68:104964. [PMID: 32800948 DOI: 10.1016/j.tiv.2020.104964] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 05/28/2020] [Revised: 07/13/2020] [Accepted: 08/06/2020] [Indexed: 12/16/2022]
Abstract
Epirubicin is a cytotoxic drug used in the treatment of different types of cancer and increasing evidence suggests that its target is cell membranes. In order to gain insight on its toxic effects, intact red blood cells (RBC), human erythrocyte membranes and molecular models were used. The latter consisted in bilayers of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE), phospholipid classes found mainly in the outer and inner monolayers of the human erythrocyte membrane, respectively. The results obtained by X-ray diffraction displayed that epirubicin induced structural perturbations in multilayers of DMPC. Differential scanning calorimetry (DSC) showed that epirubicin disturbed the thermotropic behavior of both DMPC and DMPE vesicles, whereas fluorescence spectroscopy demonstrated alterations in the fluidity of DMPC vesicles and the erythrocyte membrane. Scanning electron microscopy (SEM) revealed that epirubicin changed the normal discoid form of RBC to echinocytes and stomatocytes. Electron paramagnetic resonance (EPR) disclosed that this drug induced conformational changes in the erythrocyte membrane proteins. These findings demonstrate that epirubicin interacts with lipids and proteins of the human erythrocyte membrane, effects that might compromise the integrity and function of cell membranes. This is the first time that its toxic effects on the human erythrocyte membrane have been described.
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Affiliation(s)
- Karla Petit
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile
| | - Mario Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile.
| | - José R Colina
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile
| | - David Contreras
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile; Center of Biotecnology, University of Concepción, Concepción, Chile
| | - Luis F Aguilar
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Malgorzata Jemiola-Rzeminska
- Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Kazimierz Strzalka
- Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
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Zambrano P, Suwalsky M, Jemiola-Rzeminska M, Strzalka K, Aguilar LF. An in vitro study on the interaction of the anti-Alzheimer drug rivastigmine with human erythrocytes. Chem Biol Interact 2020; 319:109019. [PMID: 32092302 DOI: 10.1016/j.cbi.2020.109019] [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: 12/22/2019] [Revised: 02/13/2020] [Accepted: 02/18/2020] [Indexed: 10/25/2022]
Abstract
The inhibition of the enzyme acetylcholinesterase (AChE) is a frequently used therapeutic option to treat Alzheimer's disease (AD). By decreasing the levels of acetylcholine degradation in the synaptic space, some cognitive functions of patients suffering from this disease are significantly improved. Rivastigmine is one of the most widely used AChE inhibitors. The objective of this work was to determine the effects of this drug on human erythrocytes, which have a type of AChE in the cell membrane. To that end, human erythrocytes and molecular models of its membrane constituted by dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE) were used. They correspond to classes of phospholipids present in the outer and inner monolayers of the human erythrocyte membrane, respectively. The experimental results obtained by X-ray diffraction and differential scanning calorimetry (DSC) indicated that rivastigmine molecules were able to interact with both phospholipids. Fluorescence spectroscopy results showed that rivastigmine produce a slight change in the acyl chain packing order and a weak displacement of the water molecules of the hydrophobic-hydrophilic membrane interface. On the other hand, observations by scanning electron microscopy (SEM) showed that the drug changed the normal biconcave shape of erythrocytes in stomatocytes (cup-shaped cells) and echinocytes (speculated shaped).
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Affiliation(s)
- Pablo Zambrano
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile.
| | - Mario Suwalsky
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile
| | - Malgorzata Jemiola-Rzeminska
- Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland
| | - Kazimierz Strzalka
- Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland
| | - Luis F Aguilar
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
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9
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Zambrano P, Suwalsky M, Jemiola-Rzeminska M, Strzalka K, Sepúlveda B, Gallardo MJ, Aguilar LF. The acetylcholinesterase (AChE) inhibitor and anti-Alzheimer drug donepezil interacts with human erythrocytes. Biochim Biophys Acta Biomembr 2019; 1861:1078-1085. [PMID: 30904408 DOI: 10.1016/j.bbamem.2019.03.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Revised: 03/06/2019] [Accepted: 03/18/2019] [Indexed: 12/19/2022]
Abstract
Donepezil is used to treat symptomatically the Alzheimer's disease (AD). This drug is a specific inhibitor of the enzyme acetylcholinesterase (AChE), whose main physiological function is to hydrolyze the neurotransmitter acetylcholine. The main objective of this work was to study the effect of donepezil on human erythrocytes as AChE is present in its membrane. For this purpose, human erythrocytes and molecular model of its membrane built-up of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE) were used. The latter correspond to classes of phospholipids present in the outer and inner monolayers of the human erythrocyte membrane, respectively. Our experimental evidences obtained from X-ray diffraction and differential scanning calorimetry (DSC) analysis indicated that donepezil was capable of interacting with both phospholipids. Fluorescence spectroscopy results showed a moderate increase in the fluidity of the hydrophobic tails of DMPC and isolated unsealed human erythrocyte membranes (IUM). On the other hand, results by scanning electron microscopy (SEM) and optical defocusing microscopy (DM) showed that the drug changed the normal biconcave shape of the erythrocytes inducing the formation of stomatocytes (cup-shaped cells). This effect was explained by the incorporation of donepezil molecules into the erythrocyte membrane and interactions with AChE.
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Affiliation(s)
- Pablo Zambrano
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile
| | - Mario Suwalsky
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile.
| | - Malgorzata Jemiola-Rzeminska
- Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland
| | - Kazimierz Strzalka
- Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland
| | | | | | - Luis F Aguilar
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
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Gallardo MJ, Suwalsky M, Ramírez D, Tapia J, Sepulveda B. Antioxidant effect of resveratrol in single red blood cells measured by thermal fluctuation spectroscopy. Arch Biochem Biophys 2019; 665:30-35. [PMID: 30796890 DOI: 10.1016/j.abb.2019.02.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 12/09/2018] [Revised: 02/14/2019] [Accepted: 02/16/2019] [Indexed: 01/29/2023]
Abstract
The human red blood cell (RBC) membrane has significant elastic capabilities which can be described measuring typical membrane edge fluctuations and mechanical properties by optical techniques. The RBC elastic properties can be affected by changes in the surrounding media. In an attempt to elucidate the molecular mechanisms of the interaction of resveratrol with the red cell membrane and of its antioxidant capacity the changes in mechanical properties of the RBC membrane were analyzed. These studies were carried out through measurements of RBC membrane fluctuations in the presence of the oxidant agent HClO using thermal fluctuation spectroscopy (TFS). The observed results showed that the elastic capabilities of RBC changed with low concentration of hypochlorous acid but without morphological changes. However, in the presence of resveratrol the deformation and decrease of elastic capabilities induced by HClO on RBC decreased. These in vitro results demonstrated the protective effect of RV against the detrimental effects triggered by HClO upon human erythrocytes.
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Affiliation(s)
| | - Mario Suwalsky
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile.
| | - Diego Ramírez
- Centro de Óptica y Fotónica, Universidad de Concepción, Concepción, Chile; Departmento de Física, Universidad de Concepción, Concepción, Chile; Facultad de Ingeniería y Tecnología, Universidad San Sebastián, Concepción, Chile
| | - Jorge Tapia
- Centro de Óptica y Fotónica, Universidad de Concepción, Concepción, Chile; Departmento de Física, Universidad de Concepción, Concepción, Chile
| | - Benjamín Sepulveda
- Centro de Óptica y Fotónica, Universidad de Concepción, Concepción, Chile; Departmento de Física, Universidad de Concepción, Concepción, Chile
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11
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Colina JR, Suwalsky M, Manrique-Moreno M, Petit K, Aguilar LF, Jemiola-Rzeminska M, Strzalka K. An in vitro study of the protective effect of caffeic acid on human erythrocytes. Arch Biochem Biophys 2019; 662:75-82. [DOI: 10.1016/j.abb.2018.12.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 11/26/2018] [Accepted: 12/03/2018] [Indexed: 12/12/2022]
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12
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Colina JR, Suwalsky M, Manrique-Moreno M, Petit K, Aguilar LF, Jemiola-Rzeminska M, Strzalka K. Protective effect of epigallocatechin gallate on human erythrocytes. Colloids Surf B Biointerfaces 2018; 173:742-750. [PMID: 30384271 DOI: 10.1016/j.colsurfb.2018.10.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [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: 05/10/2018] [Revised: 10/12/2018] [Accepted: 10/15/2018] [Indexed: 12/30/2022]
Abstract
The interactions and the protective effect of epigallocatechin gallate (EGCG) on human erythrocytes (RBC) and molecular models of its membrane were investigated. The latter consisted of bilayers built- up of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE), representative of phospholipid classes located in the outer and inner monolayers of the human erythrocyte membrane, respectively. X-ray diffraction and differential scanning calorimetry experiments showed that EGCG induced significant structural and thermotropic perturbations in multilayers and vesicles of DMPC; however, these effects were not observed in DMPE. Fluorescence spectroscopy results revealed that EGCG produced alterations of the molecular dynamics at the level of the hydrophobic-hydrophilic interface in DMPC vesicles, and in isolated unsealed human erythrocyte membranes (IUM). EGCG also induced morphological alterations in RBC from their normal discoid form to echinocytes. These outcomes indicate that EGCG molecules were located in the outer monolayer of the erythrocyte membrane. The assessment of EGCG protective effect demonstrated that it inhibits the morphological alterations and lysis induced by HClO to human erythrocytes. The results obtained from this study suggest that the insertion of EGCG into the outer monolayer of the erythrocyte membrane might prevent the access and deleterious effects of oxidant molecules such as HClO and free radicals into the red cells, protecting them from oxidative damage.
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Affiliation(s)
- José R Colina
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile
| | - Mario Suwalsky
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile.
| | | | - Karla Petit
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile
| | - Luis F Aguilar
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Malgorzata Jemiola-Rzeminska
- Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Kazimierz Strzalka
- Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland; Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
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13
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Zambrano P, Suwalsky M, Jemiola-Rzeminska M, Strzalka K. α1-and β-adrenergic antagonist labetalol induces morphological changes in human erythrocytes. Biochem Biophys Res Commun 2018; 503:209-214. [DOI: 10.1016/j.bbrc.2018.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 06/01/2018] [Indexed: 11/27/2022]
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14
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Zambrano P, Suwalsky M, Jemiola-Rzeminska M, Strzalka K. Studies on the interaction of NMDA receptor antagonist memantine with cell membranes: A mini-review. Chem Biol Interact 2018; 283:47-50. [DOI: 10.1016/j.cbi.2018.01.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 01/15/2018] [Accepted: 01/26/2018] [Indexed: 01/08/2023]
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15
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Suwalsky M, Castillo I, Sánchez-Eguía BN, Gallardo MJ, Dukes N, Santiago-Osorio E, Aguiñiga I, Rivera-Martínez AR. In vitro effects of benzimidazole/thioether-copper complexes with antitumor activity on human erythrocytes. J Inorg Biochem 2017; 178:87-93. [PMID: 29121535 DOI: 10.1016/j.jinorgbio.2017.10.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 07/11/2017] [Revised: 10/11/2017] [Accepted: 10/25/2017] [Indexed: 02/02/2023]
Abstract
Two cytotoxic copper(II) complexes with N-H and N-methylated benzimidazole-derived ligands (Cu-L1 and Cu-L1Me; L1=bis(2-methylbenzimidazolyl)(2-methylthioethyl)amine, L1Me=bis(1-methyl-2-methylbenzimidazolyl)(2-methylthioethyl)amine) were synthesized and exposed to human erythrocytes and molecular models of its membrane. The latter were bilayers built-up of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE), classes of lipids present in the external and internal moieties of the human red cell membrane, respectively. Scanning electron microscopy (SEM) of erythrocytes incubated with solutions of both Cu(II) complexes showed that they induced morphological changes to the normal cells to echinocytes, and hemolysis at higher concentrations. Real-time observation of the dose-dependent effects of the complexes on live erythrocytes by defocusing microscopy (DM) confirmed SEM results. The formation of echinocytes implied that complex molecules inserted into the outer moiety of the red cell membrane. X-ray diffraction studies on DMPC and DMPE showed that none of these complexes interacted with DMPE and only Cu-L1 interacted with DMPC. This difference was explained by the fact that Cu-L1Me complex is more voluminous than Cu-L1 because it has two additional methyl groups; on the other hand, DMPC molecule has three methyl groups in its bulky terminal amino end. Thus, by steric hindrance Cu-L1Me molecules cannot intercalate into DMPC bilayer, which besides is present in the gel phase. These results, together with the increased antiproliferative capacity of the N-methylated complex Cu-L1Me over that of Cu-L1 are rationalized mainly based on its higher lipophilicity.
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Affiliation(s)
- Mario Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Chile.
| | - Ivan Castillo
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, CU, 04510, Mexico
| | - Brenda N Sánchez-Eguía
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, CU, 04510, Mexico
| | | | - Nathan Dukes
- Faculty of Medicine, Pontifical Catholic University of Chile, Santiago, Chile
| | - Edelmiro Santiago-Osorio
- Facultad de Estudios Superiores-Zaragoza, Universidad Nacional Autónoma de México, Batalla del 5 de Mayo y Fuerte de Loreto, Ciudad de México 09230, Mexico
| | - Itzen Aguiñiga
- Facultad de Estudios Superiores-Zaragoza, Universidad Nacional Autónoma de México, Batalla del 5 de Mayo y Fuerte de Loreto, Ciudad de México 09230, Mexico
| | - Ana R Rivera-Martínez
- Facultad de Estudios Superiores-Zaragoza, Universidad Nacional Autónoma de México, Batalla del 5 de Mayo y Fuerte de Loreto, Ciudad de México 09230, Mexico
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Manrique-Moreno M, Heinbockel L, Suwalsky M, Garidel P, Brandenburg K. Biophysical study of the non-steroidal anti-inflammatory drugs (NSAID) ibuprofen, naproxen and diclofenac with phosphatidylserine bilayer membranes. Biochimica et Biophysica Acta (BBA) - Biomembranes 2016; 1858:2123-2131. [DOI: 10.1016/j.bbamem.2016.06.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 05/19/2016] [Accepted: 06/10/2016] [Indexed: 11/27/2022]
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17
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Castillo I, Suwalsky M, Gallardo MJ, Troncoso V, Sánchez-Eguía BN, Santiago-Osorio E, Aguiñiga I, González-Ugarte AK. Structural and functional effects of benzimidazole/thioether–copper complexes with antitumor activity on cell membranes and molecular models. J Inorg Biochem 2016; 156:98-104. [DOI: 10.1016/j.jinorgbio.2015.12.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 11/24/2015] [Accepted: 12/28/2015] [Indexed: 12/11/2022]
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18
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Suwalsky M, Ramírez P, Avello M, Villena F, Gallardo MJ, Barriga A, Manrique-Moreno M. Morphological Effects and Antioxidant Capacity of Solanum crispum (Natre) In Vitro Assayed on Human Erythrocytes. J Membr Biol 2016; 249:349-61. [PMID: 26809653 DOI: 10.1007/s00232-016-9873-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 12/03/2015] [Accepted: 01/08/2016] [Indexed: 11/26/2022]
Abstract
In order to gain insight into the molecular mechanism of the antioxidant properties of Solanum crispum, aqueous extracts of its leaves were assayed on human erythrocytes and molecular models of its membrane. Phenolics and alkaloids were detected by HPLC-MS. Scanning electron and defocusing microscopy showed that S. crispum changed erythrocytes from the normal shape to echinocytes. These results imply that molecules present in the aqueous extracts were located in the outer monolayer of the erythrocyte membrane. Dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE) were chosen as representative of phospholipid classes located in the outer and inner monolayers of the erythrocyte membrane, respectively. X-ray diffraction showed that S. crispum preferentially interacted with DMPC bilayers. Experiments regarding its antioxidant properties showed that S. crispum neutralized the oxidative capacity of HClO on DMPE bilayers; defocusing microscopy and hemolysis assays demonstrated the protective effect of S. crispum against the oxidant effects of HClO on human erythrocytes.
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Affiliation(s)
- Mario Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile.
| | - Patricia Ramírez
- Faculty of Pharmacy, University of Concepción, Concepción, Chile
| | - Marcia Avello
- Faculty of Pharmacy, University of Concepción, Concepción, Chile
| | - Fernando Villena
- Faculty of Biological Sciences, University of Concepción, Concepción, Chile
| | - María José Gallardo
- Center for Optics and Photonics, University of Concepción, Concepción, Chile
| | - Andrés Barriga
- Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
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19
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Suwalsky M. Phospholipid Bilayers. Encyclopedia of Biomedical Polymers and Polymeric Biomaterials 2015:5965-5970. [DOI: 10.1081/e-ebpp-120051908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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20
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Suwalsky M, Jemiola-Rzeminska M, Astudillo C, Gallardo MJ, Staforelli JP, Villena F, Strzalka K. An in vitro study on the antioxidant capacity of usnic acid on human erythrocytes and molecular models of its membrane. Biochim Biophys Acta 2015; 1848:2829-38. [PMID: 26299817 DOI: 10.1016/j.bbamem.2015.08.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 08/17/2015] [Accepted: 08/19/2015] [Indexed: 11/17/2022]
Abstract
Usnic acid (UA) has been associated with chronic diseases through its antioxidant action. Its main target is the cell membrane; however, its effect on that of human erythrocytes has been scarcely investigated. To gain insight into the molecular mechanisms of the interaction between UA and cell membranes human erythrocytes and molecular models of its membrane have been utilized. Dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE) were chosen as representative of phospholipid classes located in the outer and inner monolayers of the erythrocyte membrane, respectively. Results by X-ray diffraction showed that UA produced structural perturbations on DMPC and DMPE bilayers. DSC studies have indicated that thermotropic behavior of DMPE was most strongly distorted by UA than DMPC, whereas the latter is mainly affected on the pretransition. Scanning electron (SEM) and defocusing microscopy (DM) showed that UA induced alterations to erythrocytes from the normal discoid shape to echinocytes. These results imply that UA molecules were located in the outer monolayer of the erythrocyte membrane. Results of its antioxidant properties showed that UA neutralized the oxidative capacity of HClO on DMPC and DMPE bilayers; SEM, DM and hemolysis assays demonstrated the protective effect of UA against the deleterious oxidant effects of HClO upon human erythrocytes.
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Affiliation(s)
- M Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile.
| | - M Jemiola-Rzeminska
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland; Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland
| | - C Astudillo
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile
| | - M J Gallardo
- Center for Optics and Photonics, University of Concepción, Concepción, Chile
| | - J P Staforelli
- Center for Optics and Photonics, University of Concepción, Concepción, Chile
| | - F Villena
- Faculty of Biological Sciences, University of Concepción, Concepción, Chile
| | - K Strzalka
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland; Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland
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21
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Suwalsky M, Zambrano P, Villena F, Manrique-Moreno M, Gallardo MJ, Jemiola-Rzeminska M, Strzalka K, Edwards AM, Mennickent S, Dukes N. Morphological Effects Induced In Vitro by Propranolol on Human Erythrocytes. J Membr Biol 2015; 248:683-93. [DOI: 10.1007/s00232-015-9780-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 01/29/2015] [Indexed: 11/28/2022]
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22
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Suwalsky M, F.Villena, Gallardo M. In vitro protective effects of resveratrol against oxidative damage in human erythrocytes. Biochimica et Biophysica Acta (BBA) - Biomembranes 2015; 1848:76-82. [DOI: 10.1016/j.bbamem.2014.09.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 09/12/2014] [Accepted: 09/20/2014] [Indexed: 01/30/2023]
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23
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Suwalsky M, Avello M. Antioxidant capacity of Ugni molinae fruit extract on human erythrocytes: an in vitro study. J Membr Biol 2014; 247:703-12. [PMID: 24928227 DOI: 10.1007/s00232-014-9692-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 05/22/2014] [Indexed: 11/28/2022]
Abstract
Ugni molinae is an important source of molecules with strong antioxidant activity widely used as a medicinal plant in Southern Chile-Argentina. Total phenol concentration from its fruit extract was 10.64 ± 0.04 mM gallic acid equivalents. Analysis by means of HPLC/MS indicated the presence of the anthocyanins cyanidin and peonidin, and the flavonol quercitin, all in glycosylated forms. Its antioxidant properties were assessed in human erythrocytes in vitro exposed to HClO oxidative stress. Scanning electron microscopy showed that HClO induced an alteration in erythrocytes from a normal shape to echinocytes; however, this change was highly attenuated in samples containing U. molinae extracts. It also had a tendency in order to reduce the hemolytic effect of HClO. In addition, X-ray diffraction experiments were performed in dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine bilayers, classes of lipids preferentially located in the outer and inner monolayers, respectively, of the human erythrocyte membrane. It was observed that U. molinae only interacted with DMPC. Results by fluorescence spectroscopy on DMPC large unilamellar vesicles and isolated unsealed human erythrocyte membranes also showed that it interacted with the erythrocyte membrane and DMPC. It is possible that the location of U. molinae components into the membrane outer monolayer might hinder the diffusion of HClO and of free radicals into cell membranes and the consequent decrease of the kinetics of free radical reactions.
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Affiliation(s)
- Mario Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile,
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24
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Abstract
Abstract
A structural study of the synthetic phospholipid, L-a-dimyristoyl lecithin (DM L), has been m ade by X-ray fiber diffraction methods. Three different types of oriented specimens were prepared. They were X-ray photographed under the same conditions, including tem perature and relative humidity. T hree different types of diffraction patterns, corresponding to different confor mations and/or packing arrangements, were found. They are characterized by their unit cell dimensions, space groups, molecular conformations, and packing arrangements.
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Affiliation(s)
| | - J. Tapia
- Departamento de Quimica, Universidad de Concepción, Chile
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25
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Suwalsky M, Seguel C, Neira F. X-Ray Studies on Phospholipid Bilayers, in. Structure and Morphology of L-α-Dilaurylphosphatidylethanolamine (DLPE). ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znc-1984-1-223] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Phospholipid, Bilayer, X-Ray Diffraction, Morphology, Dilaurylphosphatidylethanolam ine, Membrane Powder samples and oriented films of the synthetic phospholipid L-α-dilaurylphosphatidyl-ethanolamine (DLPE) were studied by X-ray diffraction over a wide range of hydration. Only small differences were found between the unit cell dimensions of DLPE powder and oriented-film specimens. These dimensions did not vary appreciably with hydration. In the multilayer DLPE structure, the molecules pack with polar groups parallel to the bilayer plane and hydro carbon chains perpendicular to it. Examination of oriented films by scanning electron microscopy gave information on the surface morphology. Complementary data on the lamellar packing of the molecules and the average thickness of the bilayers was provided by thin-section and shadow-cast preparations studied by transmission electron microscopy.
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Affiliation(s)
- M. Suwalsky
- Departamento de Quimica, Universidad de Concepciön, Casilla 3-C, Concepcion, Chile
| | - C.G. Seguel
- Departamento de Quimica, Universidad de Concepciön, Casilla 3-C, Concepcion, Chile
| | - F. Neira
- Departamento de Quimica, Universidad de Concepciön, Casilla 3-C, Concepcion, Chile
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Abstract
Abstract
Cytarabine, an analog of deoxycytidine, is an important agent in the treatment of ovarian carcinoma, acute myeloid and lymphoblastic leukemia. Its mechanism of action has been attributed to an interference with DNA replication. The plasma membrane has received increasing attention as a possible target of antitumor drugs, where the drugs may act as growth factor antagonists and receptor blockers, interfere with mitogenic signal transduction or exert direct cytotoxic effects. Furthermore, it has been reported that drugs that exert their antiproliferative effect by interacting with DNA generally cause structural and functional membrane alterations which may be essential for growth inhibition by these agents. This paper describes the studies undertaken to determine the structural effects induced by cytarabine to cell membranes. The results showed that cytarabine, at a concentration about one thousand times higher than that found in plasma when it is therapeutically administered, did not induce significant structural perturbation in any of these systems. Therefore, it can be unambiguously concluded that this widely used anticancer drug does not interact at all with erythrocyte membranes.
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Affiliation(s)
- Mario Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Casilla 160-C, Concepción, Chile.
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27
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Suwalsky M, Belmar J, Villena F, Gallardo MJ, Jemiola-Rzeminska M, Strzalka K. Acetylsalicylic acid (aspirin) and salicylic acid interaction with the human erythrocyte membrane bilayer induce in vitro changes in the morphology of erythrocytes. Arch Biochem Biophys 2013; 539:9-19. [PMID: 24055635 DOI: 10.1016/j.abb.2013.09.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [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: 08/07/2013] [Revised: 09/06/2013] [Accepted: 09/10/2013] [Indexed: 10/26/2022]
Abstract
Despite the well-documented information, there are insufficient reports concerning the effects of salicylate compounds on the structure and functions of cell membranes, particularly those of human erythrocytes. With the aim to better understand the molecular mechanisms of the interaction of acetylsalicylic acid (ASA) and salicylic acid (SA) with cell membranes, human erythrocyte membranes and molecular models were utilized. These consisted of bilayers of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE), representative of phospholipid classes located in the outer and inner monolayers of the human erythrocyte membrane, respectively. The capacity of ASA and SA to perturb the multibilayer structures of DMPC and DMPE was evaluated by X-ray diffraction while DMPC unilamellar vesicles (LUV) were studied by fluorescence spectroscopy. Moreover, we took advantage of the capability of differential scanning calorimetry (DSC) to detect the changes in the thermotropic phase behavior of lipid bilayers resulting from ASA and SA interaction with PC and PE molecules. In an attempt to further elucidate their effects on cell membranes, the present work also examined their influence on the morphology of intact human erythrocytes by means of defocusing and scanning electron microscopy, while isolated unsealed human erythrocyte membranes (IUM) were studied by fluorescence spectroscopy. Results indicated that both salicylates interact with human erythrocytes and their molecular models in a concentration-dependent manner perturbing their bilayer structures.
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Affiliation(s)
- Mario Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile.
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28
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Manrique-Moreno M, Londoño-Londoño J, Jemioła-Rzemińska M, Strzałka K, Villena F, Avello M, Suwalsky M. Structural effects of the Solanum steroids solasodine, diosgenin and solanine on human erythrocytes and molecular models of eukaryotic membranes. Biochim Biophys Acta 2013; 1838:266-77. [PMID: 23954587 DOI: 10.1016/j.bbamem.2013.08.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 07/30/2013] [Accepted: 08/06/2013] [Indexed: 10/26/2022]
Abstract
This report presents evidence that the following Solanum steroids: solasodine, diosgenin and solanine interact with human erythrocytes and molecular models of their membranes as follows: a) X-ray diffraction studies showed that the compounds at low molar ratios (0.1-10.0mol%) induced increasing structural perturbation to dimyristoylphosphatidylcholine bilayers and to a considerable lower extent to those of dimyristoylphosphatidylethanolamine; b) differential scanning calorimetry data showed that the compounds were able to alter the cooperativity of dimyristoylphosphatidylcholine, dimyristoylphosphatidylethanolamine and dimyristoylphosphatidylserine phase transitions in a concentration-dependent manner; c) in the presence of steroids, the fluorescence of Merocyanine 540 incorporated to the membranes decreased suggesting a fluidization of the lipid system; d) scanning electron microscopy observations showed that all steroids altered the normal shape of human erythrocytes inducing mainly echinocytosis, characterized by the formation of blebs in their surfaces, an indication that their molecules are located into the outer monolayer of the erythrocyte membrane.
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Affiliation(s)
- Marcela Manrique-Moreno
- Faculty of Exact and Natural Sciences, University of Antioquia, A.A. 1226, Medellin, Colombia
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Suwalsky M, Fierro P, Villena F, Gallardo MJ, Jemiola-Rzeminska M, Strzalka K, Gul-Hinc S, Ronowska A, Zysk M, Szutowicz A. Effects of sodium metavanadate on in vitro neuroblastoma and red blood cells. Arch Biochem Biophys 2013; 535:248-56. [PMID: 23608074 DOI: 10.1016/j.abb.2013.04.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 04/08/2013] [Accepted: 04/10/2013] [Indexed: 10/26/2022]
Abstract
Toxicity of vanadium on cells is one of the less studied effects. This prompted us to study the structural effects induced on neuroblastoma and erythrocytes by vanadium (V) sodium metavanadate. This salt was incubated with mice cholinergic neuroblastoma cells and intact human erythrocytes. To learn whether metavanadate interacts with membrane lipid bilayers it was incubated with bilayers built-up of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE). These are phospholipid classes located in the outer and inner monolayers of the human erythrocyte membrane, respectively. Exposure of neuroblastoma cells to metavanadate showed significant decreases in cell viability as well as in cell number correlating with inhibition of aconitase activity. In scanning electron microscopy (SEM) and defocusing microscopy (DM) it was observed that induced on erythrocytes the formation of echinocytes. However, no effects were obtained when metavanadate was made to interact with DMPC and DMPE multibilayers and liposomes, assays performed by X-ray diffraction and differential scanning calorimetry (DSC), respectively. These results imply that the effects of metavanadate on erythrocytes are through interactions with proteins located in the membrane outer moiety, and could still involve other minor lipid components as well. Also, partly unsaturated lipids could interact differently the fully saturated chains in the model systems.
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Affiliation(s)
- Mario Suwalsky
- Faculty of Chemical Sciences, University of Concepción, P.O. Box 160-C, Concepción, Chile.
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Etcheverry S, Gallardo MJ, Solano P, Suwalsky M, Mesquita ON, Saavedra C. Real-time study of shape and thermal fluctuations in the echinocyte transformation of human erythrocytes using defocusing microscopy. J Biomed Opt 2012; 17:106013. [PMID: 23224012 DOI: 10.1117/1.jbo.17.10.106013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present a real-time method to measure the amplitude of thermal fluctuations in biological membranes by means of a new treatment of the defocusing microscopy (DM) optical technique. This approach was also applied to study the deformation of human erythrocytes to its echinocyte structure. This was carried out by making three-dimensional shape reconstructions of the cell and measuring the thermal fluctuations of its membrane, as the cell is exposed to the anti-inflammatory drug naproxen and as it recovers its original shape, when it is subsequently cleansed of the drug. The results showed biomechanical changes in the membrane even at low naproxen concentration (0.2 mM). Also, we found that when the cell recovered its original shape, the membrane properties were different compared to the nondrugged initial erythrocyte, indicating that the drug administration-recovery process is not completely reversible.
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Suwalsky M, Fierro P, Villena F, Aguilar LF, Sotomayor CP, Jemiola-Rzeminska M, Strzalka K, Gul-Hinc S, Ronowska A, Szutowicz A. Human erythrocytes and neuroblastoma cells are in vitro affected by sodium orthovanadate. Biochim Biophys Acta 2012; 1818:2260-70. [PMID: 22546530 DOI: 10.1016/j.bbamem.2012.04.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Revised: 03/29/2012] [Accepted: 04/16/2012] [Indexed: 11/25/2022]
Abstract
Research on biological influence of vanadium has gained major importance because it exerts potent toxic, mutagenic, and genotoxic effects on a wide variety of biological systems. However, hematological toxicity is one of the less studied effects. The lack of information on this issue prompted us to study the structural effects induced on the human erythrocyte membrane by vanadium (V). Sodium orthovanadate was incubated with intact erythrocytes, isolated unsealed human erythrocyte membranes (IUM) and molecular models of the erythrocyte membrane. The latter consisted of bilayers of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE), phospholipid classes located in the outer and inner monolayers of the human erythrocyte membrane, respectively. This report presents evidence in order that orthovanadate interacted with red cell membranes as follows: a) in scanning electron microscopy (SEM) studies it was observed that morphological changes on human erythrocytes were induced; b) fluorescence spectroscopy experiments in isolated unsealed human erythrocyte membranes (IUM) showed that an increase in the molecular dynamics and/or water content at the shallow depth of the lipids glycerol backbone at concentrations as low as 50μM was produced; c) X-ray diffraction studies showed that orthovanadate 0.25-1mM range induced increasing structural perturbation to DMPE; d) somewhat similar effects were observed by differential scanning calorimetry (DSC) with the exception of the fact that DMPC pretransition was shown to be affected; and e) fluorescence spectroscopy experiments performed in DMPC large unilamellar vesicles (LUV) showed that at very low concentrations induced changes in DPH fluorescence anisotropy at 18°C. Additional experiments were performed in mice cholinergic neuroblastoma SN56 cells; a statistically significant decrease of cell viability was observed on orthovanadate in low or moderate concentrations.
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Affiliation(s)
- M Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile.
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Rojas-Aguirre Y, Hernández-Luis F, Mendoza-Martínez C, Sotomayor CP, Aguilar LF, Villena F, Castillo I, Hernández DJ, Suwalsky M. Effects of an antimalarial quinazoline derivative on human erythrocytes and on cell membrane molecular models. Biochim Biophys Acta 2011; 1818:738-46. [PMID: 22155684 DOI: 10.1016/j.bbamem.2011.11.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 11/21/2011] [Accepted: 11/22/2011] [Indexed: 11/16/2022]
Abstract
Plasmodium, the parasite which causes malaria in humans multiplies in the liver and then infects circulating erythrocytes. Thus, the role of the erythrocyte cell membrane in antimalarial drug activity and resistance has key importance. The effects of the antiplasmodial N(6)-(4-methoxybenzyl)quinazoline-2,4,6-triamine (M4), and its inclusion complex (M4/HPβCD) with 2-hydroxypropyl-β-cyclodextrin (HPβCD) on human erythrocytes and on cell membrane molecular models are herein reported. This work evidences that M4/HPβCD interacts with red cells as follows: a) in scanning electron microscopy (SEM) studies on human erythrocytes induced shape changes at a 10μM concentration; b) in isolated unsealed human erythrocyte membranes (IUM) a concentration as low as 1μM induced sharp DPH fluorescence anisotropy decrease whereas increasing concentrations produced a monotonically decrease of DPH fluorescence lifetime at 37°C; c) X-ray diffraction studies showed that 200μM induced a complete structural perturbation of dimyristoylphosphatidylcholine (DMPC) bilayers whereas no significant effects were detected in dimyristoylphosphatidylethanolamine (DMPE) bilayers, classes of lipids present in the outer and inner monolayers of the human erythrocyte membrane, respectively; d) fluorescence spectroscopy data showed that increasing concentrations of the complex interacted with the deep hydrophobic core of DMPC large unilamellar vesicles (LUV) at 18°C. All these experiments are consistent with the insertion of M4/HPβCD in the outer monolayer of the human erythrocyte membrane; thus, it can be considered a promising and novel antimalarial agent.
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Suwalsky M, Manrique-Moreno M, Howe J, Brandenburg K, Villena F. Molecular interactions of mefenamic acid with lipid bilayers and red blood cells. J BRAZIL CHEM SOC 2011. [DOI: 10.1590/s0103-50532011001200002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Manrique-Moreno M, Villena F, Sotomayor CP, Edwards AM, Muñoz MA, Garidel P, Suwalsky M. Human cells and cell membrane molecular models are affected in vitro by the nonsteroidal anti-inflammatory drug ibuprofen. Biochimica et Biophysica Acta (BBA) - Biomembranes 2011; 1808:2656-64. [DOI: 10.1016/j.bbamem.2011.07.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2011] [Revised: 06/10/2011] [Accepted: 07/07/2011] [Indexed: 12/17/2022]
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Suwalsky M, Bolognin S, Zatta P. Interaction of Alzheimer β-amyloid and metal complexes with lipid bilayers. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311094529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Granzotto A, Suwalsky M, Zatta P. Physiological cholesterol concentration is a neuroprotective factor against β-amyloid and β-amyloid-metal complexes toxicity. J Inorg Biochem 2011; 105:1066-72. [PMID: 21726769 DOI: 10.1016/j.jinorgbio.2011.05.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Revised: 05/09/2011] [Accepted: 05/18/2011] [Indexed: 10/18/2022]
Abstract
Alzheimer's disease is one of the most common forms of dementia in the elderly. One of its hallmarks is the abnormal aggregation and deposition of β-amyloid (Aβ). Endogenous and exogenous metal ions seem to influence β-amyloid folding process, aggregation and deposition. Besides these variables other elements appear to affect β-amyloid behavior, such as cholesterol. The physiological concentration of cholesterol in the cerebrospinal fluid (CSF) was used in order to determine the extent in which Aβ and Aβ-metal complexes in vitro aggregation and their toxicity on human neuroblastoma cell cultures is affected. Cholesterol did not appear to influence Aβ and Aβ-metal complexes aggregation, but it was effective in protecting neuroblastoma cells against Aβ complexes' toxicity. The Aβ-Al complex seemed to be the most effective in disrupting and damaging membrane external layer, and simultaneously it appears to increase its toxicity on cell cultures; both of these effects are preventable by cholesterol. The presence in physiological concentrations of cholesterol seemed to compensate membrane damage that occurred to neuroblastoma cells. These findings appear to contradict some data reported in literature. We believe that our results might shed some light on the role played by cholesterol at physiological concentrations in both cellular balance and membrane protection.
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Affiliation(s)
- A Granzotto
- CNR-Institute for Biomedical Technologies, Padua Metalloproteins Unit, Department of Biology, University of Padua, Viale G. Colombo 3-35121 Padua, Italy
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Suwalsky M, Tapia J, Knight E, Duk L, Seguel CG, Neira F. X-ray studies on phospholipid bilayers. VI. Comparative hydration effects on oriented films. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19860020112] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Suwalsky M, González R, Villena F, Aguilar LF, Sotomayor CP, Bolognin S, Zatta P. Human erythrocytes and neuroblastoma cells are affected in vitro by Au(III) ions. Biochem Biophys Res Commun 2010; 397:226-31. [DOI: 10.1016/j.bbrc.2010.05.089] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2010] [Accepted: 05/17/2010] [Indexed: 11/25/2022]
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Manrique-Moreno M, Suwalsky M, Villena F, Garidel P. Effects of the nonsteroidal anti-inflammatory drug naproxen on human erythrocytes and on cell membrane molecular models. Biophys Chem 2010; 147:53-8. [PMID: 20083338 DOI: 10.1016/j.bpc.2009.12.010] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2009] [Revised: 12/21/2009] [Accepted: 12/23/2009] [Indexed: 12/20/2022]
Abstract
Naproxen, a nonsteroidal anti-inflammatory drug (NSAID), has been widely investigated in terms of its pharmacological action, but less is known about its effects on cell membranes and particularly those of human erythrocytes. In the present work, the structural effects on the human erythrocyte membrane and molecular models have been investigated. The latter consisted in bilayers built-up of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE), classes of lipids found in the outer and inner moieties of the erythrocyte and most cell membranes, respectively. This report presents evidence that naproxen interacts with red cell membranes as follows: a) in scanning electron microscopy (SEM) studies on human erythrocytes it has been observed that the drug induced shape changes, forming echinocytes at a concentration as low as 10microM; b) X-ray diffraction showed that naproxen strongly interacted with DMPC multilayers; in contrast, no perturbing effects on DMPE multilayers were detected; c) differential scanning calorimetry (DSC) data showed a decrease in the melting temperature (T(m)) of DMPC liposomes, which was attributed to a destabilization of the gel phase, effect that was less pronounced for DMPE. These experimental results were observed at concentrations lower than those reported for plasma after therapeutic administration. This is the first time in which the structural effects of naproxen on the human erythrocyte membrane have been described.
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Manrique-Moreno M, Howe J, Suwalsky M, Garidel P, Brandenburg K. Physicochemical Interaction Study of Non-Steroidal Anti-Inflammatory Drugs with Dimyristoylphosphatidylethanolamine Liposomes. LETT DRUG DES DISCOV 2010. [DOI: 10.2174/157018010789869280] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Suwalsky M, Villena F, Sotomayor C. Mn2+ exerts stronger structural effects than the Mn–citrate complex on the human erythrocyte membrane and molecular models. J Inorg Biochem 2010; 104:55-61. [DOI: 10.1016/j.jinorgbio.2009.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Revised: 09/25/2009] [Accepted: 10/05/2009] [Indexed: 10/20/2022]
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Abstract
A number of observations indicate that the primary target of amyloid-beta (Abeta) peptide is the cellular membrane of neurons. In the context of these observations we investigated, using X-ray diffraction techniques, whether Abeta-metal complexes were able to affect lipid bilayers as a model of cell membranes. The binding of Al to Abeta gave particular conformational properties to the peptide that led to a marked alteration of the lipid bilayer representing phospholipids located in the outer monolayer of cell membranes. This effect was peculiar, since in our experimental conditions Abeta alone did not affect the lipid architecture, whereas the Al salt did, but only at concentrations several orders of magnitude higher than those of the Abeta-Al complex. In accordance with the effects observed with lipid bilayers, studies with human neuroblastoma cells demonstrated an impairment of cell functioning only in the presence of Abeta-Al complex. Our findings imply that Al, compared to the other Abeta-metal complexes tested, could have a specifically relevant effect in enhancing Abeta toxicity.
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Affiliation(s)
- Mario Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile
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Suwalsky M, González R, Villena F, Aguilar LF, Sotomayor CP, Bolognin S, Zatta P. Structural effects of tetrachloroauric acid on cell membranes and molecular models. Coord Chem Rev 2009. [DOI: 10.1016/j.ccr.2009.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Suwalsky M, Oyarce K, Avello M, Villena F, Sotomayor CP. Human erythrocytes and molecular models of cell membranes are affected in vitro by Balbisia peduncularis (Amancay) extracts. Chem Biol Interact 2009; 179:413-8. [DOI: 10.1016/j.cbi.2008.12.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2008] [Revised: 12/09/2008] [Accepted: 12/11/2008] [Indexed: 11/25/2022]
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Suwalsky M, Manrique M, Villena F, Sotomayor CP. Structural effects in vitro of the anti-inflammatory drug diclofenac on human erythrocytes and molecular models of cell membranes. Biophys Chem 2009; 141:34-40. [DOI: 10.1016/j.bpc.2008.12.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2008] [Revised: 12/18/2008] [Accepted: 12/19/2008] [Indexed: 10/21/2022]
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Suwalsky M, Vargas P, Avello M, Villena F, Sotomayor CP. Human erythrocytes are affected in vitro by flavonoids of Aristotelia chilensis (Maqui) leaves. Int J Pharm 2008; 363:85-90. [DOI: 10.1016/j.ijpharm.2008.07.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2008] [Revised: 07/03/2008] [Accepted: 07/07/2008] [Indexed: 10/21/2022]
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Suwalsky M, Mennickent S, Villena F, Sotomayor CP. Phospholipids Bilayers as Molecular Models for Drug- Membrane Interactions. The Case of the Antiepileptics Phenytoin and Carbamazepine. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/masy.200850915] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Suwalsky M, Villena F, Sotomayor CP, Bolognin S, Zatta P. Human cells and cell membrane molecular models are affected in vitro by chlorpromazine. Biophys Chem 2008; 135:7-13. [DOI: 10.1016/j.bpc.2008.02.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2008] [Revised: 02/28/2008] [Accepted: 02/28/2008] [Indexed: 11/16/2022]
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Suwalsky M, Castro R, Villena F, Sotomayor C. Cr(III) exerts stronger structural effects than Cr(VI) on the human erythrocyte membrane and molecular models. J Inorg Biochem 2008; 102:842-9. [DOI: 10.1016/j.jinorgbio.2007.11.020] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2007] [Revised: 11/27/2007] [Accepted: 11/30/2007] [Indexed: 11/29/2022]
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Suwalsky M, Fierro P, Villena F, Sotomayor CP. Effects of lithium on the human erythrocyte membrane and molecular models. Biophys Chem 2007; 129:36-42. [PMID: 17532553 DOI: 10.1016/j.bpc.2007.05.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2007] [Revised: 05/03/2007] [Accepted: 05/07/2007] [Indexed: 11/19/2022]
Abstract
The mechanism whereby lithium carbonate controls manic episodes and possibly influences affective disorders is not yet known. There is evidence, however, that lithium alters sodium transport and may interfere with ion exchange mechanisms and nerve conduction. For these reasons it was thought of interest to study its perturbing effects upon membrane structures. The effects of lithium carbonate (Li+) on the human erythrocyte membrane and molecular models have been investigated. The molecular models consisted in bilayers of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE), representing classes of phospholipids located in the outer and inner monolayers of the erythrocyte membrane, respectively. This report presents the following evidence that Li+ interacts with cell membranes: a) X-ray diffraction indicated that Li+ induced structural perturbation of the polar head group and of the hydrophobic acyl regions of DMPC and DMPE; b) experiments performed on DMPC large unilamellar vesicles (LUV) by fluorescence spectroscopy also showed that Li+ interacted with the lipid polar groups and hydrophobic acyl chains, and c) in scanning electron microscopy (SEM) studies on intact human erythrocytes the formation of echinocytes was observed, effect that might be due to the insertion of Li+ in the outer monolayer of the red cell membrane.
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Affiliation(s)
- Mario Suwalsky
- Faculty of Chemical Sciences, University of Concepción, Concepción, Chile.
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