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Gerokonstantis DT, Nikolaou A, Magkrioti C, Afantitis A, Aidinis V, Kokotos G, Moutevelis-Minakakis P. Synthesis of novel 2-pyrrolidinone and pyrrolidine derivatives and study of their inhibitory activity against autotaxin enzyme. Bioorg Med Chem 2019; 28:115216. [PMID: 31864778 DOI: 10.1016/j.bmc.2019.115216] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 11/11/2019] [Accepted: 11/13/2019] [Indexed: 12/13/2022]
Abstract
Autotaxin (ATX), a glycoprotein (~125 kDa) isolated as an autocrine motility factor from melanoma cells, belongs to a seven-membered family of ectonucleotide pyrophosphatase/phosphodiesterase (ENPP), and exhibits lysophospholipase D activity. ATX is responsible for the hydrolysis of lysophosphatidylcholine (LPC) to produce the bioactive lipid lysophosphatidic acid (LPA), which is upregulated in a variety of pathological inflammatory conditions, including fibrosis, cancer, liver toxicity and thrombosis. Given its role in human disease, the ATX-LPA axis is an interesting target for therapy, and the development of novel potent ATX inhibitors is of great importance. In the present work a novel class of ATX inhibitors, optically active derivatives of 2-pyrrolidinone and pyrrolidine heterocycles were synthesized. Some of them exhibited interesting in vitro activity, namely the hydroxamic acid 16 (IC50 700 nM) and the carboxylic acid 40b (IC50 800 nM), while the boronic acid derivatives 3k (IC50 50 nM), 3l (IC50 120 nM), 3 m (IC50 180 nM) and 21 (IC50 35 nM) were found to be potent inhibitors of ATX.
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Affiliation(s)
| | - Aikaterini Nikolaou
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15771, Greece
| | - Christiana Magkrioti
- Division of Immunology, Biomedical Sciences Research Center "Alexander Fleming", Athens 16672, Greece
| | | | - Vassilis Aidinis
- Division of Immunology, Biomedical Sciences Research Center "Alexander Fleming", Athens 16672, Greece
| | - George Kokotos
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15771, Greece
| | - Panagiota Moutevelis-Minakakis
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15771, Greece.
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Şahin A, Şentürk M, Salmas RE, Durdagi S, Ayan A, Karagölge A, Mestanoğlu M. Investigation of inhibition of human glucose 6-phosphate dehydrogenase by some 99mTc chelators by in silico and in vitro methods. J Enzyme Inhib Med Chem 2016; 31:141-147. [PMID: 27143114 DOI: 10.1080/14756366.2016.1178735] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
The inhibitory effects of methoxyisobutylisonitrile (MIBI), diethylene triamine pentaacetic acid (DTPA), dimercaptosuccinic acid (DMSA) and metilendifosfonat (MDP) on human erythrocyte glucose 6-phosphate dehydrogenase (hG6PD) activity were investigated. For this purpose, hG6PD was initially purified 557-fold at a yield of 51.43% using 2',5'-adenosine diphosphate (ADP) sepharose 4B affinity gel chromatography. The in vitro effects of these chelators on hG6PD enzyme were studied. IC50 values of MIBI, DTPA, DMSA and MDP were 0.056, 0.172, 0.274 and 0.175 mM, of hG6PD, respectively. It was detected in in vitro studies that the hG6PD enzyme is inhibited due to these radiopharmaceutical chelators. In addition to in vitro studies, in order to better understand the molecular mechanism of studied compounds, combined in silico approaches, including molecular docking and molecular dynamics (MD), simulations were successfully performed. MD simulations shed light on inhibition mechanisms of the individual inhibitors into the ligand-binding pocket of hG6PD. Essential amino acids for binding are also investigated using per-residue interaction analysis studies.
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Affiliation(s)
- Ali Şahin
- a Faculty of Medicine , Department of Nuclear Medicine, Ataturk University , Erzurum , Turkey
| | - Murat Şentürk
- b Science and Arts Faculty, Department of Chemistry, Agri Ibrahim Cecen University , Agri , Turkey
| | - Ramin E Salmas
- c School of Medicine, Department of Biophysics, Bahcesehir University , Istanbul , Turkey , and
| | - Serdar Durdagi
- c School of Medicine, Department of Biophysics, Bahcesehir University , Istanbul , Turkey , and
| | - Arif Ayan
- a Faculty of Medicine , Department of Nuclear Medicine, Ataturk University , Erzurum , Turkey
| | - Ali Karagölge
- a Faculty of Medicine , Department of Nuclear Medicine, Ataturk University , Erzurum , Turkey
| | - Mert Mestanoğlu
- d School of Medicine, Bahcesehir University , Istanbul , Turkey
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Salmas RE, Yurtsever M, Durdagi S. Atomistic molecular dynamics simulations of typical and atypical antipsychotic drugs at the dopamine D2 receptor (D2R) elucidates their inhibition mechanism. J Biomol Struct Dyn 2016; 35:738-754. [DOI: 10.1080/07391102.2016.1159986] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
| | - Mine Yurtsever
- Department of Chemistry, Istanbul Technical University, Istanbul, Turkey
| | - Serdar Durdagi
- Department of Biophysics, School of Medicine, Bahcesehir University, Istanbul, Turkey
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Salmas RE, Mestanoglu M, Unlu A, Yurtsever M, Durdagi S. Mutated form (G52E) of inactive diphtheria toxin CRM197: molecular simulations clearly display effect of the mutation to NAD binding. J Biomol Struct Dyn 2016; 34:2462-8. [PMID: 26836774 DOI: 10.1080/07391102.2015.1119060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Mutated form (G52E) of diphtheria toxin (DT) CRM197 is an inactive and nontoxic enzyme. Here, we provided a molecular insight using comparative molecular dynamics (MD) simulations to clarify the influence of a single point mutation on overall protein and active-site loop. Post-processing MD analysis (i.e. stability, principal component analysis, hydrogen-bond occupancy, etc.) is carried out on both wild and mutated targets to investigate and to better understand the mechanistic differences of structural and dynamical properties on an atomic scale especially at nicotinamide adenine dinucleotide (NAD) binding site when a single mutation (G52E) happens at the DT. In addition, a docking simulation is performed for wild and mutated forms. The docking scoring analysis and docking poses results revealed that mutant form is not able to properly accommodate the NAD molecule.
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Affiliation(s)
- Ramin Ekhteiari Salmas
- a Department of Chemistry , Istanbul Technical University , Istanbul , Turkey.,b Department of Biophysics , School of Medicine, Bahcesehir University , Istanbul , Turkey
| | - Mert Mestanoglu
- c School of Medicine , Bahcesehir University , Istanbul , Turkey
| | - Ayhan Unlu
- d Faculty of Medicine, Department of Biophysics , Trakya University , Edirne , Turkey
| | - Mine Yurtsever
- a Department of Chemistry , Istanbul Technical University , Istanbul , Turkey
| | - Serdar Durdagi
- b Department of Biophysics , School of Medicine, Bahcesehir University , Istanbul , Turkey
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Abboud R, Charcosset C, Greige-Gerges H. Tetra- and Penta-Cyclic Triterpenes Interaction with Lipid Bilayer Membrane: A Structural Comparative Study. J Membr Biol 2016; 249:327-38. [PMID: 26759229 DOI: 10.1007/s00232-016-9871-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 01/01/2016] [Indexed: 10/22/2022]
Abstract
The effect of tetracyclic (cortisol, prednisolone, and 9-fluorocortisol acetate) and pentacyclic (uvaol and erythrodiol) triterpenes (TTPs) on the fluidity of dipalmitoyl phosphatidyl choline (DPPC) liposome membrane was investigated by differential scanning calorimetry, Raman spectroscopy, and fluorescence polarization of 1,6-diphenyl-1,3,5-hexatriene (DPH). Liposomes were prepared in the absence and presence of TTPs at molar ratios DPPC:TTP 100:1, 100:2.5, and 100:10. All the studied TTPs abolished the pre-transition and modified the intensity of the Raman peak at 715 cm(-1) proving the interaction of TTP molecules with the choline head group of phospholipids. An increase in the Raman height intensity ratios of the peaks I 2935/2880, I 2844/2880, and I 1090/1130, giving information about the ratio disorder/order of the alkyl chains, and a decrease of the main transition temperature demonstrated the interaction of TTPs with the alkyl chains. The tetracyclic TTPs produced broadening of the phase transition profile. Besides, a scarcely splitting of the main transition peak was obtained with prednisolone and 9-fluorocortisol acetate. The results of fluorescence depolarization of DPH showed that the studied molecules fluidized the liposomal membrane at 25, 41, and 50 °C. Pentacyclic TTPs, being more hydrophobic than tetracyclic ones, demonstrated higher fluidizing effect than tetracyclic TTPs in the liquid crystalline phase suggesting a deeper incorporation in the lipid bilayer. The presence of a free polar head group at the ring D seems to control the TTP incorporation in the bilayer and consequently its effect on the membrane fluidity.
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Affiliation(s)
- Rola Abboud
- Bioactive Molecules Research Group, Doctoral School of Sciences and Technologies, Faculty of Sciences, Section II, Lebanese University, B.P. 90656, Jdaidet el-Matn, Lebanon.,Laboratoire d'Automatique et de Génie des Procédés (LAGEP), UMR-CNRS 5007, Université Claude Bernard Lyon 1, CPE Lyon, Bat 308G, 43 Boulevard du 11 Novembre 1918, 69622, Villeurbanne Cedex, France
| | - Catherine Charcosset
- Laboratoire d'Automatique et de Génie des Procédés (LAGEP), UMR-CNRS 5007, Université Claude Bernard Lyon 1, CPE Lyon, Bat 308G, 43 Boulevard du 11 Novembre 1918, 69622, Villeurbanne Cedex, France
| | - Hélène Greige-Gerges
- Bioactive Molecules Research Group, Doctoral School of Sciences and Technologies, Faculty of Sciences, Section II, Lebanese University, B.P. 90656, Jdaidet el-Matn, Lebanon.
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Yousefpour A, Modarress H, Goharpey F, Amjad-Iranagh S. Interaction of PEGylated anti-hypertensive drugs, amlodipine, atenolol and lisinopril with lipid bilayer membrane: A molecular dynamics simulation study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:1687-98. [DOI: 10.1016/j.bbamem.2015.04.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 03/09/2015] [Accepted: 04/10/2015] [Indexed: 12/12/2022]
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7
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Sadeghpour A, Rappolt M, Ntountaniotis D, Chatzigeorgiou P, Viras K, Megariotis G, Papadopoulos M, Siapi E, Mali G, Mavromoustakos T. Comparative study of interactions of aliskiren and AT 1 receptor antagonists with lipid bilayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:984-94. [DOI: 10.1016/j.bbamem.2014.12.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 11/29/2014] [Accepted: 12/03/2014] [Indexed: 11/27/2022]
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Kellici TF, Tzakos AG, Mavromoustakos T. Rational drug design and synthesis of molecules targeting the angiotensin II type 1 and type 2 receptors. Molecules 2015; 20:3868-97. [PMID: 25738535 PMCID: PMC6272512 DOI: 10.3390/molecules20033868] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 02/06/2015] [Accepted: 02/15/2015] [Indexed: 02/07/2023] Open
Abstract
The angiotensin II (Ang II) type 1 and type 2 receptors (AT1R and AT2R) orchestrate an array of biological processes that regulate human health. Aberrant function of these receptors triggers pathophysiological responses that can ultimately lead to death. Therefore, it is important to design and synthesize compounds that affect beneficially these two receptors. Cardiovascular disease, which is attributed to the overactivation of the vasoactive peptide hormone Αng II, can now be treated with commercial AT1R antagonists. Herein, recent achievements in rational drug design and synthesis of molecules acting on the two AT receptors are reviewed. Quantitative structure activity relationships (QSAR) and molecular modeling on the two receptors aim to assist the search for new active compounds. As AT1R and AT2R are GPCRs and drug action is localized in the transmembrane region the role of membrane bilayers is exploited. The future perspectives in this field are outlined. Tremendous progress in the field is expected if the two receptors are crystallized, as this will assist the structure based screening of the chemical space and lead to new potent therapeutic agents in cardiovascular and other diseases.
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Affiliation(s)
- Tahsin F Kellici
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece
- Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Andreas G Tzakos
- Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Thomas Mavromoustakos
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece.
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Insights into the molecular basis of action of the AT1 antagonist losartan using a combined NMR spectroscopy and computational approach. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1838:1031-46. [PMID: 24374319 DOI: 10.1016/j.bbamem.2013.12.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 12/17/2013] [Accepted: 12/19/2013] [Indexed: 01/11/2023]
Abstract
The drug:membrane interactions for the antihypertensive AT1 antagonist losartan, the prototype of the sartans class, are studied herein using an integrated approach. The pharmacophore arrangement of the drug was revealed by rotating frame nuclear Overhauser effect spectroscopy (2D ROESY) NMR spectroscopy in three different environments, namely water, dimethyl sulfoxide (DMSO), and sodium dodecyl sulfate (SDS) micellar solutions mimicking conditions of biological transport fluids and membrane lipid bilayers. Drug association with micelles was monitored by diffusion ordered spectroscopy (2D DOSY) and drug:micelle intermolecular interactions were characterized by ROESY spectroscopy. The localisation of the drug in the micellar environment was investigated by introducing 5-doxyl and 16-doxyl stearic acids. The use of spin labels confirmed that losartan resides close to the micelle:water interface with the hydroxymethyl group and the tetrazole heterocyclic aromatic ring facing the polar surface with the potential to interact with SDS charged polar head groups in order to increase amphiphilic interactions. The spontaneous insertion, the diffusion pathway and the conformational features of losartan were monitored by Molecular Dynamics (MD) simulations in a modeled SDS micellar aggregate environment and a long exploratory MD run (580ns) in a phospholipid dipalmitoylphosphatidylcholine (DPPC) bilayer with the AT1 receptor embedded. MD simulations were in excellent agreement with experimental results and further revealed the molecular basis of losartan:membrane interactions in atomic-level detail. This applied integrated approach aims to explore the role of membranes in losartan's pathway towards the AT1 receptor.
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Sarpietro MG, Spatafora C, Accolla ML, Cascio O, Tringali C, Castelli F. Effect of resveratrol-related stilbenoids on biomembrane models. JOURNAL OF NATURAL PRODUCTS 2013; 76:1424-1431. [PMID: 23895642 DOI: 10.1021/np400188m] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The interactions of the two resveratrol analogues 2-hydroxy-3,5,3',5'-tetramethoxystilbene (4) and 2-hydroxy-3,5,3',4'-tetramethoxystilbene (5) with model biomembranes were studied. The aim of this investigation was to highlight possible differences in the interactions with such biomembranes related to the minimal structural differences between these isomeric stilbenoids. In particular, different experiments on stilbenoid/biomembrane model systems using both differential scanning calorimetry (DSC) and Langmuir-Blodgett techniques were carried out to evaluate stilbenoid/multilamellar vesicle and stilbenoid/phospholipid monolayer interactions, respectively. Dimyristoylphosphatidylcholine was used as constituent of the biomembrane models and permitted the experiments to be carried out at 37 °C, close to body temperature. Kinetic studies were also run by DSC to evaluate the uptake of the resveratrol derivatives by the biomembrane model in an aqueous medium and when transported by a lipophilic carrier. The results indicated that both of the resveratrol analogues influenced the behavior of multilamellar vesicles and monolayers, biomembrane models, with 4 producing a larger effect than 5. These results are useful for better understanding the mechanism of action of these compounds. Moreover, the kinetic results could be of importance for future design of lipophilic delivery systems for these stilbenoids.
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Affiliation(s)
- Maria Grazia Sarpietro
- Dipartimento di Scienze del Farmaco, Università degli Studi di Catania, Viale A. Doria 6, 95125 Catania, Italy.
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Agelis G, Resvani A, Ntountaniotis D, Chatzigeorgiou P, Koukoulitsa C, Androutsou ME, Plotas P, Matsoukas J, Mavromoustakos T, Cendak T, Godec TU, Mali G. Interactions of the potent synthetic AT1 antagonist analog BV6 with membrane bilayers and mesoporous silicate matrices. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:1846-55. [PMID: 23506680 DOI: 10.1016/j.bbamem.2013.03.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 03/06/2013] [Accepted: 03/08/2013] [Indexed: 11/27/2022]
Abstract
The present work describes the drug:membrane interactions and a drug delivery system of the novel potent AT1 blocker BV6. This designed analog has most of the pharmacological segments of losartan and an additional biphenyltetrazole moiety resulting in increased lipophilicity. We found that BV6:membrane interactions lead to compact bilayers that may in part explain its higher in vitro activity compared to losartan since such environment may facilitate its approach to AT1 receptor. Its high docking score to AT1 receptor stems from more hydrophobic interactions compared to losartan. X-ray powder diffraction (XRPD) and thermogravimetric analysis (TGA) have shown that BV6 has a crystalline form that is not decomposed completely up to 600°C. These properties are desirable for a drug molecule. BV6 can also be incorporated into a mesoporous silicate drug-delivery matrix SBA-15. The properties of the obtained drug-delivery system have been inspected by XRD, (13)C CP/MAS, TGA and nitrogen sorption experiments.
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Affiliation(s)
- G Agelis
- Eldrug S.A., Patras Science Park, Stadiou, Platani, Rio Patras, Greece
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Moutevelis-Minakakis P, Papavassilopoulou E, Mavromoustakos T. Synthesis of new optically active 2-pyrrolidinones. Molecules 2012; 18:50-73. [PMID: 23344188 PMCID: PMC6270552 DOI: 10.3390/molecules18010050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 12/05/2012] [Accepted: 12/12/2012] [Indexed: 11/26/2022] Open
Abstract
A new class of optically active 2-pyrrolidinones was synthesized, starting from S-pyroglutamic acid, a well known natural chiral synthon. The synthetic design followed led to the insertion of various substituents at positions 1 and 5 of the 2-pyrrolidinone ring, including the imidazole moiety. Some of them possess two or three stereogenic centers, the configuration of which was retained under the mild conditions used. The new compounds also carry an imidazole moiety, which, along with the 2-pyrrolidinone template, may prove pivotal to several biological processes.
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Fotakis C, Megariotis G, Christodouleas D, Kritsi E, Zoumpoulakis P, Ntountaniotis D, Zervou M, Potamitis C, Hodzic A, Pabst G, Rappolt M, Mali G, Baldus J, Glaubitz C, Papadopoulos MG, Afantitis A, Melagraki G, Mavromoustakos T. Comparative study of the AT1 receptor prodrug antagonist candesartan cilexetil with other sartans on the interactions with membrane bilayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1818:3107-20. [DOI: 10.1016/j.bbamem.2012.08.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 07/26/2012] [Accepted: 08/13/2012] [Indexed: 11/28/2022]
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Hodzic A, Zoumpoulakis P, Pabst G, Mavromoustakos T, Rappolt M. Losartan's affinity to fluid bilayers modulates lipid-cholesterol interactions. Phys Chem Chem Phys 2012; 14:4780-8. [PMID: 22395854 DOI: 10.1039/c2cp40134g] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Losartan is an angiotensin II receptor antagonist mainly used for the regulation of high blood pressure. Since it was anticipated that losartan reaches the receptor site via membrane diffusion, the impact of losartan on model membranes has been investigated by small angle X-ray scattering. For this purpose 2-20 mol% losartan was incorporated into dimyristoyl-phosphatidylcholine (DMPC) and palmitoyl-oleoyl-phosphatidylcholine (POPC) bilayers and into their binary mixtures with cholesterol in the concentration range of 0 to 40 mol%. Effects of losartan on single component bilayers are alike. Partitioning of losartan into the membranes confers a negative charge to the lipid bilayers that causes the formation of unilamellar vesicles and a reduction of the bilayer thickness by 3-4%. Analysis of the structural data resulted in an estimate for the partial area of losartan, A(Los) ≈ 40 Å(2). In the presence of cholesterol, differences between the effects of losartan on POPC and DMPC are striking. Membrane condensation by cholesterol is retarded by losartan in POPC. This contrasts with DMPC, where an increase of the cholesterol content shifts the partitioning equilibrium of losartan towards the aqueous phase, such that losartan gets depleted from the bilayers from 20 mol% cholesterol onwards. This indicates (i) a chain-saturation dependent competition of losartan with lipid-cholesterol interactions, and (ii) the insolubility of losartan in the liquid ordered phase of PCs. Consequently, losartan's action is more likely to take place in fluid plasma membrane patches rather than in domains rich in cholesterol and saturated lipid species such as in membrane rafts.
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Affiliation(s)
- A Hodzic
- Institute of Biophysics and Nanosystems Research, Austrian Academy of Science, 8042 Graz, Austria
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Ntountaniotis D, Mali G, Grdadolnik SG, Halabalaki M, Maria H, Skaltsounis AL, Potamitis C, Siapi E, Chatzigeorgiou P, Rappolt M, Mavromoustakos T. Thermal, dynamic and structural properties of drug AT1 antagonist olmesartan in lipid bilayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1808:2995-3006. [PMID: 21843501 DOI: 10.1016/j.bbamem.2011.08.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 07/14/2011] [Accepted: 08/01/2011] [Indexed: 01/13/2023]
Abstract
It is proposed that AT1 antagonists (ARBs) exert their biological action by inserting into the lipid membrane and then diffuse to the active site of AT1 receptor. Thus, lipid bilayers are expected to be actively involved and play a critical role in drug action. For this reason, the thermal, dynamic and structural effects of olmesartan alone and together with cholesterol were studied using differential scanning calorimetry (DSC), 13C magic-angle spinning (MAS) nuclear magnetic resonance (NMR), cross-polarization (CP) MAS NMR, and Raman spectroscopy as well as small- and wide angle X-ray scattering (SAXS and WAXS) on dipalmitoyl-phosphatidylcholine (DPPC) multilamellar vesicles. 13C CP/MAS spectra provided direct evidence for the incorporation of olmesartan and cholesterol in lipid bilayers. Raman and X-ray data revealed how both molecules modify the bilayer's properties. Olmesartan locates itself at the head-group region and upper segment of the lipid bilayers as 13C CP/MAS spectra show that its presence causes significant chemical shift changes mainly in the A ring of the steroidal part of cholesterol. The influence of olmesartan on DPPC/cholesterol bilayers is less pronounced. Although, olmesartan and cholesterol are residing at the same region of the lipid bilayers, due to their different sizes, display distinct impacts on the bilayer's properties. Cholesterol broadens significantly the main transition, abolishes the pre-transition, and decreases the membrane fluidity above the main transition. Olmesartan is the only so far studied ARB that increases the gauche:trans ratio in the liquid crystalline phase. These significant differences of olmesartan may in part explain its distinct pharmacological profile.
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Potamitis C, Chatzigeorgiou P, Siapi E, Viras K, Mavromoustakos T, Hodzic A, Pabst G, Cacho-Nerin F, Laggner P, Rappolt M. Interactions of the AT1 antagonist valsartan with dipalmitoyl-phosphatidylcholine bilayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1808:1753-63. [DOI: 10.1016/j.bbamem.2011.02.002] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 01/30/2011] [Accepted: 02/01/2011] [Indexed: 11/16/2022]
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17
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Koukoulitsa C, Durdagi S, Siapi E, Villalonga-Barber C, Alexi X, Steele BR, Micha-Screttas M, Alexis MN, Tsantili-Kakoulidou A, Mavromoustakos T. Comparison of thermal effects of stilbenoid analogs in lipid bilayers using differential scanning calorimetry and molecular dynamics: correlation of thermal effects and topographical position with antioxidant activity. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2011; 40:865-75. [DOI: 10.1007/s00249-011-0705-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2010] [Revised: 04/01/2011] [Accepted: 04/08/2011] [Indexed: 01/08/2023]
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18
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Moutevelis-Minakakis P, Papavassilopoulou E, Michas G, Georgikopoulou K, Ragoussi ME, Neophytou N, Zoumpoulakis P, Mavromoustakos T, Hadjipavlou-Litina D. Synthesis, in silico docking experiments of new 2-pyrrolidinone derivatives and study of their anti-inflammatory activity. Bioorg Med Chem 2011; 19:2888-902. [PMID: 21507662 DOI: 10.1016/j.bmc.2011.03.044] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Revised: 02/18/2011] [Accepted: 03/18/2011] [Indexed: 10/18/2022]
Abstract
A new class of 2-pyrrolidinone derivatives was designed, synthesized, and tested for their antioxidant and anti-inflammatory activities. The compounds were evaluated for their inhibitory activity against LOX. The most potent among them, 14d [IC(50) 0.08 (±0.005)mM], and 14e [IC(50) 0.0705 (±0.003)mM], were also tested in vivo. The compound 14d induced equipotent inhibition against rat paw edema, which is very close to the effect produced by the commonly used standard, namely indomethacin (47%). The LOX inhibitory activity of the compound 14e proceeds in parallel to the % inhibitory value of lipid peroxidation meaning that this LOX inhibitory activity is supported by the lipid peroxidation inhibition. The molecular features that govern their bioactivity were explored through in silico docking experiments. The results showed that acidic moieties must be placed in certain distance and orientation in the active site of LOX enzyme in order to productively exhibit inhibitory activity. In addition, the 2-pyrrolidinone template significantly contributes in the inhibitory properties of the new compounds.
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Affiliation(s)
- Panagiota Moutevelis-Minakakis
- Laboratory of Organic Chemistry, Department of Chemistry, University of Athens, Panepistimiopolis, Athens 15771, Greece.
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Gardikis K, Hatziantoniou S, Signorelli M, Pusceddu M, Micha-Screttas M, Schiraldi A, Demetzos C, Fessas D. Thermodynamic and structural characterization of Liposomal-Locked in-Dendrimers as drug carriers. Colloids Surf B Biointerfaces 2010; 81:11-9. [DOI: 10.1016/j.colsurfb.2010.06.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2010] [Revised: 06/16/2010] [Accepted: 06/16/2010] [Indexed: 10/19/2022]
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