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Sibgatullina G, Ramazanova I, Salnikov V, Stepanov A, Voloshina A, Sapunova A, Mustafina A, Petrov K, Samigullin D. Increased endocytosis rate and enhanced lysosomal pathway of silica-coated superparamagnetic nanoparticles into M-HeLa cells compared with cultured primary motor neurons. Histochem Cell Biol 2024:10.1007/s00418-024-02283-z. [PMID: 38597938 DOI: 10.1007/s00418-024-02283-z] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/21/2024] [Indexed: 04/11/2024]
Abstract
The unique properties of superparamagnetic iron oxide nanoparticles (SPIONs) enable their use as magnetic biosensors, targeted drug delivery, magnetothermia, magnetic resonance imaging, etc. Today, SPIONs are the only type of metal oxide nanoparticles approved for biomedical application. In this work, we analyzed the cellular response to the previously reported luminescent silica coated SPIONs of the two cell types: M-HeLa cells and primary motor neuron culture. Both internalization pathways and intracellular fate of SPIONs have been compared for these cell lines using fluorescence and transmission electron microscopy. We also applied a pharmacological approach to analyze the endocytosis pathways of SPIONs into the investigated cell lines. The penetration of SPIONs into M-HeLa cells is already noticeable within 30 s of incubation through both caveolin-dependent endocytosis and micropinocytosis. However, incubation for a longer time (1 h at least) is required for the internalization of SPIONs into motor neuron culture cells provided by dynamin-dependent endocytosis and macropinocytosis. The intracellular colocalization assay reveals that the lysosomal internalization pathway of SPIONs is also dependent on the cell type. The lysosomal pathway is much more pronounced for M-HeLa cells compared with motor neurons. The emphasized differences in cellular responses of the two cell lines open up new opportunities in the application of SPIONs in the diagnostics and therapy of cancer cells.
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Affiliation(s)
- Guzel Sibgatullina
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, P.O. box 261, Kazan, 420111, Russia
| | - Iliza Ramazanova
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, P.O. box 261, Kazan, 420111, Russia
| | - Vadim Salnikov
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, P.O. box 261, Kazan, 420111, Russia
| | - Alexey Stepanov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str., 8, 420088, Kazan, Russia
| | - Alexandra Voloshina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str., 8, 420088, Kazan, Russia
| | - Anastasiia Sapunova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str., 8, 420088, Kazan, Russia
| | - Asiya Mustafina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str., 8, 420088, Kazan, Russia
| | - Konstantin Petrov
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, P.O. box 261, Kazan, 420111, Russia
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str., 8, 420088, Kazan, Russia
| | - Dmitry Samigullin
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, P.O. box 261, Kazan, 420111, Russia.
- Department of Radiophotonics and Microwave Technologies, Kazan National Research Technical University Named After A.N. Tupolev-KAI, 10 K. Marx St., Kazan, 420111, Russia.
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2
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Shiabiev I, Pysin D, Akhmedov A, Babaeva O, Babaev V, Lyubina A, Voloshina A, Petrov K, Padnya P, Stoikov I. Towards Antibacterial Agents: Synthesis and Biological Activity of Multivalent Amide Derivatives of Thiacalix[4]arene with Hydroxyl and Amine Groups. Pharmaceutics 2023; 15:2731. [PMID: 38140072 PMCID: PMC10747887 DOI: 10.3390/pharmaceutics15122731] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 11/28/2023] [Accepted: 12/04/2023] [Indexed: 12/24/2023] Open
Abstract
Antimicrobial resistance to modern antibiotics stimulates the search for new ways to synthesize and modify antimicrobial drugs. The development of synthetic approaches that can easily change different fragments of the molecule is a promising solution to this problem. In this work, a synthetic approach was developed to obtain multivalent thiacalix[4]arene derivatives containing different number of amine and hydroxyl groups. A series of macrocyclic compounds in cone, partial cone, and 1,3-alternate stereoisomeric forms containing -NHCH2CH2R (R = NH2, N(CH3)2, and OH) and -N(CH2CH2OH)2 terminal fragments, and their model non-macrocyclic analogues were obtained. The antibacterial activity against Gram-positive (Staphylococcus aureus, Bacillus cereus, and Enterococcus faecalis) and Gram-negative (Escherichia coli and Pseudomonas aeruginosa) bacterial strains and cytotoxicity of the obtained compounds were studied. Structure-activity relationships were established: (1) the macrocyclic compounds had high antibacterial activity, while the monomeric compounds had low activity; (2) the compounds in cone and partial cone conformations had better antibacterial activity compared to the compounds in 1,3-alternate stereoisomeric form; (3) the macrocyclic compounds containing -NHCH2CH2N(CH3)2 terminal fragments had the highest antibacterial activity; (4) introduction of additional terminal hydroxyl groups led to a significant decrease in antibacterial activity; (5) the compounds in partial cone conformation had significant bactericidal activity against all studied cell strains; the best selectivity was observed for the compounds in cone conformation. The mechanism of antibacterial activity of lead compounds with terminal fragments -NHCH2CH2N(CH3)2 was proved using model negatively charged POPG vesicles, i.e., the addition of these compounds led to an increase in the size and zeta potential of the vesicles. The obtained results open up the possibility of using the synthesized macrocyclic compounds as promising antibacterial agents.
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Affiliation(s)
- Igor Shiabiev
- A.M. Butlerov Chemical Institute, Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia; (I.S.); (D.P.); (A.A.)
| | - Dmitry Pysin
- A.M. Butlerov Chemical Institute, Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia; (I.S.); (D.P.); (A.A.)
| | - Alan Akhmedov
- A.M. Butlerov Chemical Institute, Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia; (I.S.); (D.P.); (A.A.)
| | - Olga Babaeva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russia; (O.B.); (V.B.); (A.L.); (A.V.); (K.P.)
| | - Vasily Babaev
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russia; (O.B.); (V.B.); (A.L.); (A.V.); (K.P.)
| | - Anna Lyubina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russia; (O.B.); (V.B.); (A.L.); (A.V.); (K.P.)
| | - Alexandra Voloshina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russia; (O.B.); (V.B.); (A.L.); (A.V.); (K.P.)
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russia; (O.B.); (V.B.); (A.L.); (A.V.); (K.P.)
| | - Pavel Padnya
- A.M. Butlerov Chemical Institute, Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia; (I.S.); (D.P.); (A.A.)
| | - Ivan Stoikov
- A.M. Butlerov Chemical Institute, Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia; (I.S.); (D.P.); (A.A.)
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3
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Nazarova A, Padnya P, Kharlamova A, Petrov K, Yusupov G, Zelenikhin P, Bukharov M, Hua B, Huang F, Stoikov I. Peptidomimetics based on ammonium decasubstituted pillar[5]arenes: Influence of the alpha-amino acid residue nature on cholinesterase inhibition. Bioorg Chem 2023; 141:106927. [PMID: 37866207 DOI: 10.1016/j.bioorg.2023.106927] [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: 08/15/2023] [Revised: 10/12/2023] [Accepted: 10/17/2023] [Indexed: 10/24/2023]
Abstract
Cholinesterase inhibitors are a group of medicines that are widely used for the treatment of cognitive impairments accompanying Alzheimer's disease as well as for the treatment of pathological muscle weaknesses syndromes such as myasthenia gravis. The search for novel non-toxic and effective cholinesterase inhibitors for creating neuroprotective and neurotransmitter agents is an urgent interdisciplinary problem. For the first time, the application of water-soluble pillar[5]arenes containing amino acid residues as effective cholinesterase inhibitors was shown. The influence of the nature of aliphatic and aromatic alpha-amino acid residues (glycine, l-alanine, l-phenylalanine and l-tryptophan) on self-assembly, aggregate's stability, cytotoxicity on A549 and LEK cells and cholinesterase inhibition was studied. It was found that the studied compounds with aliphatic amino acid residues showed a low inhibitory ability against cholinesterases. It was established that the pillar[5]arene containing fragments of l-phenylalanine is the most promising inhibitor of butyrylcholinesterase (IC50 = 0.32 ± 0.01 μM), the pillar[5]arene with l-tryptophan residues is the most promising inhibitor of acetylcholinesterase (IC50 = 0.32 ± 0.01 μM). This study has shown a possible application of peptidomimetics based on pillar[5]arenes to inhibit cholinesterase, as well as control the binding affinity to a particular enzyme in a structure-dependent manner.
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Affiliation(s)
- Anastasia Nazarova
- A. M. Butlerov Chemistry Institute, Kazan Federal University, 18 Kremlyovskaya str., 420008 Kazan, Russia.
| | - Pavel Padnya
- A. M. Butlerov Chemistry Institute, Kazan Federal University, 18 Kremlyovskaya str., 420008 Kazan, Russia
| | - Alexandra Kharlamova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., Kazan 420088, Russia
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., Kazan 420088, Russia
| | - George Yusupov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 18 Kremlyovskaya str., 420008 Kazan, Russia
| | - Pavel Zelenikhin
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 18 Kremlyovskaya str., 420008 Kazan, Russia
| | - Mikhail Bukharov
- A. M. Butlerov Chemistry Institute, Kazan Federal University, 18 Kremlyovskaya str., 420008 Kazan, Russia
| | - Bin Hua
- Stoddart Institute of Molecular Science, Department of Chemistry Zhejiang University, 310058 Hangzhou, PR China; Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, 311215 Hangzhou, PR China
| | - Feihe Huang
- Stoddart Institute of Molecular Science, Department of Chemistry Zhejiang University, 310058 Hangzhou, PR China; Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, 311215 Hangzhou, PR China; Green Catalysis Center and College of Chemistry, Zhengzhou University, 450001 Zhengzhou, PR China
| | - Ivan Stoikov
- A. M. Butlerov Chemistry Institute, Kazan Federal University, 18 Kremlyovskaya str., 420008 Kazan, Russia.
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Vasileva L, Gaynanova G, Kuznetsova D, Valeeva F, Lyubina A, Amerhanova S, Voloshina A, Sibgatullina G, Samigullin D, Petrov K, Zakharova L. Mitochondria-Targeted Lipid Nanoparticles Loaded with Rotenone as a New Approach for the Treatment of Oncological Diseases. Molecules 2023; 28:7229. [PMID: 37894708 PMCID: PMC10609561 DOI: 10.3390/molecules28207229] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/09/2023] [Accepted: 10/21/2023] [Indexed: 10/29/2023] Open
Abstract
This research is based on the concept that mitochondria are a promising target for anticancer therapy, including thatassociated with the use of oxidative phosphorylation blockers (mitochondrial poisons). Liposomes based on L-α-phosphatidylcholine (PC) and cholesterol (Chol) modified with cationic surfactants with triphenylphosphonium (TPPB-n, where n = 10, 12, 14, and 16) and imidazolium (IA-n(OH), where n = 10, 12, 14, and 16) head groups were obtained. The physicochemical characteristics of liposomes at different surfactant/lipid molar ratios were determined by dynamic/electrophoretic light scattering, transmission electron microscopy, and spectrophotometry. The hydrodynamic diameter of all the systems was within 120 nm with a polydispersity index of no more than 0.24 even after 2 months of storage. It was shown that cationization of liposomes leads to an increase in the internalization of nanocontainers in pancreatic carcinoma (PANC-1) and duodenal adenocarcinoma (HuTu 80) cells compared with unmodified liposomes. Also, using confocal microscopy, it was shown that liposomes modified with TPPB-14 and IA-14(OH) statistically better colocalize with the mitochondria of tumor cells compared with unmodified ones. At the next stage, the mitochondrial poison rotenone (ROT) was loaded into cationic liposomes. It was shown that the optimal loading concentration of ROT is 0.1 mg/mL. The Korsmeyer-Peppas and Higuchi kinetic models were used to describe the release mechanism of ROT from liposomes in vitro. A significant reduction in the IC50 value for the modified liposomes compared with free ROT was shown and, importantly, a higher degree of selectivity for the HuTu 80 cell line compared with the normal cells (SI value is 307 and 113 for PC/Chol/TPPB-14/ROT and PC/Chol/IA-14(OH)/ROT, respectively) occurred. It was shown that the treatment of HuTu 80 cells with ROT-loaded cationic liposomal formulations leads to a dose-dependent decrease in the mitochondrial membrane potential.
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Affiliation(s)
- Leysan Vasileva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia
| | - Gulnara Gaynanova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia
| | - Darya Kuznetsova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia
| | - Farida Valeeva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia
| | - Anna Lyubina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia
| | - Syumbelya Amerhanova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia
| | - Alexandra Voloshina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia
| | - Guzel Sibgatullina
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, 2/31 Lobachevsky Str., Kazan 420111, Russia
| | - Dmitry Samigullin
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, 2/31 Lobachevsky Str., Kazan 420111, Russia
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia
| | - Lucia Zakharova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia
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Bychkov ML, Isaev AB, Andreev-Andrievskiy AA, Petrov K, Paramonov AS, Kirpichnikov MP, Lyukmanova EN. Aβ1-42 Accumulation Accompanies Changed Expression of Ly6/uPAR Proteins, Dysregulation of the Cholinergic System, and Degeneration of Astrocytes in the Cerebellum of Mouse Model of Early Alzheimer Disease. Int J Mol Sci 2023; 24:14852. [PMID: 37834299 PMCID: PMC10573428 DOI: 10.3390/ijms241914852] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 09/23/2023] [Accepted: 09/27/2023] [Indexed: 10/15/2023] Open
Abstract
Alzheimer disease (AD) is a widespread neurodegenerative disease characterized by the accumulation of oligomeric toxic forms of β-amyloid (Aβ1-42) and dysfunction of the cholinergic system in the different brain regions. However, the exact mechanisms of AD pathogenesis and the role of the nicotinic acetylcholine receptors (nAChRs) in the disease progression remain unclear. Here, we revealed a decreased expression of a number of the Ly6/uPAR proteins targeting nAChRs in the cerebellum of 2xTg-AD mice (model of early AD) in comparison with non-transgenic mice both at mRNA and protein levels. We showed that co-localization of one of them, - neuromodulator Lynx1, with α7-nAChR was diminished in the vicinity of cerebellar astrocytes of 2xTg-AD mice, while Aβ1-42 co-localization with this receptor present was increased. Moreover, the expression of anti-inflammatory transcription factor KLF4 regulating transcription of the Ly6/uPAR genes was decreased in the cerebellum of 2xTg-AD mice, while expression of inflammatory cytokine TNF-α was increased. Based on these data together with observed astrocyte degeneration in the cerebellum of 2xTg-AD mice, we suggest the mechanism by which expression of the Ly6/uPAR proteins upon Aβ pathology results in dysregulation of the cholinergic system and particularly of α7-nAChR function in the cerebellum. This leads to enhanced neuroinflammation and cerebellar astrocyte degeneration.
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Affiliation(s)
- Maxim L. Bychkov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 119997 Moscow, Russia; (M.L.B.); (A.B.I.); (A.S.P.); (M.P.K.)
| | - Aizek B. Isaev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 119997 Moscow, Russia; (M.L.B.); (A.B.I.); (A.S.P.); (M.P.K.)
- Moscow Institute of Physics and Technology, State University, 141701 Dolgoprudny, Russia
| | - Alexander A. Andreev-Andrievskiy
- Interdisciplinary Scientific and Educational School of Moscow University «Molecular Technologies of the Living Systems and Synthetic Biology», Faculty of Biology, Lomonosov Moscow State University, 119234 Moscow, Russia;
- Institute for Biomedical Problems of Russian Academy of Sciences, 123007 Moscow, Russia
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences”, Arbuzov Str., 8, 420088 Kazan, Russia;
| | - Alexander S. Paramonov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 119997 Moscow, Russia; (M.L.B.); (A.B.I.); (A.S.P.); (M.P.K.)
| | - Mikhail P. Kirpichnikov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 119997 Moscow, Russia; (M.L.B.); (A.B.I.); (A.S.P.); (M.P.K.)
- Interdisciplinary Scientific and Educational School of Moscow University «Molecular Technologies of the Living Systems and Synthetic Biology», Faculty of Biology, Lomonosov Moscow State University, 119234 Moscow, Russia;
| | - Ekaterina N. Lyukmanova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 119997 Moscow, Russia; (M.L.B.); (A.B.I.); (A.S.P.); (M.P.K.)
- Moscow Institute of Physics and Technology, State University, 141701 Dolgoprudny, Russia
- Interdisciplinary Scientific and Educational School of Moscow University «Molecular Technologies of the Living Systems and Synthetic Biology», Faculty of Biology, Lomonosov Moscow State University, 119234 Moscow, Russia;
- Biological Department, Shenzhen MSU-BIT University, Shenzhen 518172, China
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Vasileva L, Gaynanova G, Valeeva F, Romanova E, Pavlov R, Kuznetsov D, Belyaev G, Zueva I, Lyubina A, Voloshina A, Petrov K, Zakharova L. Synthesis, Properties, and Biomedical Application of Dicationic Gemini Surfactants with Dodecane Spacer and Carbamate Fragments. Int J Mol Sci 2023; 24:12312. [PMID: 37569687 PMCID: PMC10419252 DOI: 10.3390/ijms241512312] [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: 07/18/2023] [Revised: 07/29/2023] [Accepted: 07/29/2023] [Indexed: 08/13/2023] Open
Abstract
A synthesis procedure and aggregation properties of a new homologous series of dicationic gemini surfactants with a dodecane spacer and two carbamate fragments (N,N'-dialkyl-N,N'-bis(2-(ethylcarbamoyloxy)ethyl)-N,N'-dimethyldodecan-1,6-diammonium dibromide, n-12-n(Et), where n = 10, 12, 14) were comprehensively described. The critical micelle concentrations of gemini surfactants were obtained using tensiometry, conductometry, spectrophotometry, and fluorimetry. The thermodynamic parameters of adsorption and micellization, i.e., maximum surface excess (Гmax), the surface area per surfactant molecule (Amin), degree of counterion binding (β), and Gibbs free energy of micellization (∆Gmic), were calculated. Functional activity of the surfactants, including the solubilizing capacity toward Orange OT and indomethacin, incorporation into the lipid bilayer, minimum inhibitory concentration, and minimum bactericidal and fungicidal concentrations, was determined. Synthesized gemini surfactants were further used for the modification of liposomes dual-loaded with α-tocopherol and donepezil hydrochloride for intranasal treatment of Alzheimer's disease. The obtained liposomes have high stability (more than 5 months), a significant positive charge (approximately + 40 mV), and a high degree of encapsulation efficiency toward rhodamine B, α-tocopherol, and donepezil hydrochloride. Korsmeyer-Peppas, Higuchi, and first-order kinetic models were used to process the in vitro release curves of donepezil hydrochloride. Intranasal administration of liposomes loaded with α-tocopherol and donepezil hydrochloride for 21 days prevented memory impairment and decreased the number of Aβ plaques by 37.6%, 40.5%, and 72.6% in the entorhinal cortex, DG, and CA1 areas of the hippocampus of the brain of transgenic mice with Alzheimer's disease model (APP/PS1) compared with untreated animals.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Lucia Zakharova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
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7
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Vasileva L, Gaynanova G, Valeeva F, Belyaev G, Zueva I, Bushmeleva K, Sibgatullina G, Samigullin D, Vyshtakalyuk A, Petrov K, Zakharova L, Sinyashin O. Mitochondria-Targeted Delivery Strategy of Dual-Loaded Liposomes for Alzheimer's Disease Therapy. Int J Mol Sci 2023; 24:10494. [PMID: 37445673 DOI: 10.3390/ijms241310494] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 06/17/2023] [Accepted: 06/20/2023] [Indexed: 07/15/2023] Open
Abstract
Liposomes modified with tetradecyltriphenylphosphonium bromide with dual loading of α-tocopherol and donepezil hydrochloride were successfully designed for intranasal administration. Physicochemical characteristics of cationic liposomes such as the hydrodynamic diameter, zeta potential, and polydispersity index were within the range from 105 to 115 nm, from +10 to +23 mV, and from 0.1 to 0.2, respectively. In vitro release curves of donepezil hydrochloride were analyzed using the Korsmeyer-Peppas, Higuchi, First-Order, and Zero-Order kinetic models. Nanocontainers modified with cationic surfactant statistically better penetrate into the mitochondria of rat motoneurons. Imaging of rat brain slices revealed the penetration of nanocarriers into the brain. Experiments on transgenic mice with an Alzheimer's disease model (APP/PS1) demonstrated that the intranasal administration of liposomes within 21 days resulted in enhanced learning abilities and a reduction in the formation rate of Aβ plaques in the entorhinal cortex and hippocampus of the brain.
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Affiliation(s)
- Leysan Vasileva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
| | - Gulnara Gaynanova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
| | - Farida Valeeva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
| | - Grigory Belyaev
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
| | - Irina Zueva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
| | - Kseniya Bushmeleva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
| | - Guzel Sibgatullina
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, 2/31 Lobachevsky Str., 420111 Kazan, Russia
| | - Dmitry Samigullin
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, 2/31 Lobachevsky Str., 420111 Kazan, Russia
- Institute for Radio-Electronics and Telecommunications, Kazan National Research Technical University Named after A.N. Tupolev-KAI, 10 K. Marx St., 420111 Kazan, Russia
| | - Alexandra Vyshtakalyuk
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
| | - Lucia Zakharova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
| | - Oleg Sinyashin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Str., 420088 Kazan, Russia
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Bogachev M, Sinitca A, Grigarevichius K, Pyko N, Lyanova A, Tsygankova M, Davletshin E, Petrov K, Ageeva T, Pyko S, Kaplun D, Kayumov A, Mukhamedshina Y. Video-based marker-free tracking and multi-scale analysis of mouse locomotor activity and behavioral aspects in an open field arena: A perspective approach to the quantification of complex gait disturbances associated with Alzheimer's disease. Front Neuroinform 2023; 17:1101112. [PMID: 36817970 PMCID: PMC9932053 DOI: 10.3389/fninf.2023.1101112] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 01/12/2023] [Indexed: 02/05/2023] Open
Abstract
Introduction Complex gait disturbances represent one of the prominent manifestations of various neurophysiological conditions, including widespread neurodegenerative disorders such as Alzheimer's and Parkinson's diseases. Therefore, instrumental measurement techniques and automatic computerized analysis appears essential for the differential diagnostics, as well as for the assessment of treatment effectiveness from experimental animal models to clinical settings. Methods Here we present a marker-free instrumental approach to the analysis of gait disturbances in animal models. Our approach is based on the analysis of video recordings obtained with a camera placed underneath an open field arena with transparent floor using the DeeperCut algorithm capable of online tracking of individual animal body parts, such as the snout, the paws and the tail. The extracted trajectories of animal body parts are next analyzed using an original computerized methodology that relies upon a generalized scalable model based on fractional Brownian motion with parameters identified by detrended partial cross-correlation analysis. Results We have shown that in a mouse model representative movement patterns are characterized by two asymptotic regimes characterized by integrated 1/f noise at small scales and nearly random displacements at large scales separated by a single crossover. More detailed analysis of gait disturbances revealed that the detrended cross-correlations between the movements of the snout, paws and tail relative to the animal body midpoint exhibit statistically significant discrepancies in the Alzheimer's disease mouse model compared to the control group at scales around the location of the crossover. Discussion We expect that the proposed approach, due to its universality, robustness and clear physical interpretation, is a promising direction for the design of applied analysis tools for the diagnostics of various gait disturbances and behavioral aspects in animal models. We further believe that the suggested mathematical models could be relevant as a complementary tool in clinical diagnostics of various neurophysiological conditions associated with movement disorders.
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Affiliation(s)
- Mikhail Bogachev
- Centre for Digital Telecommunication Technologies, St. Petersburg Electrotechnical University “LETI”, St. Petersburg, Russia
- Institute for Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
| | - Aleksandr Sinitca
- Centre for Digital Telecommunication Technologies, St. Petersburg Electrotechnical University “LETI”, St. Petersburg, Russia
| | - Konstantin Grigarevichius
- Centre for Digital Telecommunication Technologies, St. Petersburg Electrotechnical University “LETI”, St. Petersburg, Russia
| | - Nikita Pyko
- Centre for Digital Telecommunication Technologies, St. Petersburg Electrotechnical University “LETI”, St. Petersburg, Russia
| | - Asya Lyanova
- Centre for Digital Telecommunication Technologies, St. Petersburg Electrotechnical University “LETI”, St. Petersburg, Russia
| | - Margarita Tsygankova
- Centre for Digital Telecommunication Technologies, St. Petersburg Electrotechnical University “LETI”, St. Petersburg, Russia
| | - Eldar Davletshin
- Institute for Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
| | - Konstantin Petrov
- FRC Kazan Scientific Center of RAS, Arbuzov Institute of Organic and Physical Chemistry, Kazan, Russia
| | - Tatyana Ageeva
- Institute for Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
| | - Svetlana Pyko
- Centre for Digital Telecommunication Technologies, St. Petersburg Electrotechnical University “LETI”, St. Petersburg, Russia
| | - Dmitrii Kaplun
- Centre for Digital Telecommunication Technologies, St. Petersburg Electrotechnical University “LETI”, St. Petersburg, Russia
| | - Airat Kayumov
- Institute for Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
| | - Yana Mukhamedshina
- Institute for Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
- Department of Histology, Cytology and Embryology, Kazan State Medical University, Kazan, Russia
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Fedorenko S, Farvaeva D, Stepanov A, Bochkova O, Kholin K, Nizameev I, Drobyshev S, Gerasimova T, Voloshina A, Fanizza E, Depalo N, Sibgatullina G, Samigullin D, Petrov K, Gubaidullin A, Mustafina A. Tricks for organic-capped Cu2-xS nanoparticles encapsulation into silica nanocomposites co-doped with red emitting luminophore for NIR activated-photothermal/chemodynamic therapy. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114187] [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: 10/16/2022]
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Zakharova L, Gaynanova G, Vasilieva E, Vasileva L, Pavlov R, Kashapov R, Petrov K, Sinyashin O. Recent nanoscale carriers for therapy of Alzheimer's disease: current strategies and perspectives. Curr Med Chem 2022; 30:3743-3774. [PMID: 36380443 DOI: 10.2174/0929867330666221115103513] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 09/09/2022] [Accepted: 09/20/2022] [Indexed: 11/17/2022]
Abstract
Abstract:
This review covers nanotherapeutic strategies for solving the global problems associated with Alzheimer's disease (AD). The most dramatic factor contributing humanistic, social and economic urgency of the situation is the incurability of the disease, with the drug intervention addressing only AD symptoms and retarding their progress. Key sources behind these challenges are the inability of the early diagnosis of AD, the lack of comprehensive information on the molecular mechanism of the pathogenesis, the blood-brain barrier obstacles, and the insufficient effectiveness of currently available drugs and therapeutic strategies. The application of nanocarriers allows part of these problems to be solved, together with the improvement of drug bioavailability, prolonged circulation, and overcoming/bypassing the biological barriers. To this date, numerous types and sub-types of nanocarriers are developed and reviewed, the majority of which can be adapted for the treatment of various diseases. Therefore, herein, nanotherapy strategies are specifically categorized in term of the administration routes of AD medicines, with the noninvasive, i.e., transdermal, oral, and intranasal routes emphasized. Further, benefits/limitations of various nanocarriers are discussed, and perspectives of their application are highlighted.
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Affiliation(s)
- Lucia Zakharova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Gulnara Gaynanova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Elmira Vasilieva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Leysan Vasileva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Rais Pavlov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Ruslan Kashapov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Oleg Sinyashin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
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Faizullin B, Dayanova I, Strelnik I, Kholin K, Nizameev I, Gubaidullin A, Voloshina A, Gerasimova T, Kashnik I, Brylev K, Sibgatullina G, Samigullin D, Petrov K, Musina E, Karasik A, Mustafina A. pH-Driven Intracellular Nano-to-Molecular Disassembly of Heterometallic [Au 2L 2]{Re 6Q 8} Colloids (L = PNNP Ligand; Q = S 2- or Se 2-). Nanomaterials (Basel) 2022; 12:nano12183229. [PMID: 36145017 PMCID: PMC9505965 DOI: 10.3390/nano12183229] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 09/12/2022] [Accepted: 09/14/2022] [Indexed: 06/02/2023]
Abstract
The present work introduces a simple, electrostatically driven approach to engineered nanomaterial built from the highly cytotoxic [Au2L2]2+ complex (Au2, L = 1,5-bis(p-tolyl)-3,7-bis(pyridine-2-yl)-1,5-diaza-3,7-diphosphacyclooctane (PNNP) ligand) and the pH-sensitive red-emitting [{Re6Q8}(OH)6]4- (Re6-Q, Q = S2- or Se2-) cluster units. The protonation/deprotonation of the Re6-Q unit is a prerequisite for the pH-triggered assembly of Au2 and Re6-Q into Au2Re6-Q colloids, exhibiting disassembly in acidic (pH = 4.5) conditions modeling a lysosomal environment. The counter-ion effect of polyethylenimine causes the release of Re6-Q units from the colloids, while the binding with lysozyme restricts their protonation in acidified conditions. The enhanced luminescence response of Re6-S on the disassembly of Au2Re6-S colloids in the lysosomal environment allows us to determine their high lysosomal localization extent through the colocalization assay, while the low luminescence of Re6-Se units in the same conditions allows us to reveal the rapture of the lysosomal membrane through the use of the Acridine Orange assay. The lysosomal pathway of the colloids, followed by their endo/lysosomal escape, correlates with their cytotoxicity being on the same level as that of Au2 complexes, but the contribution of the apoptotic pathway differentiates the cytotoxic effect of the colloids from that of the Au2 complex arisen from the necrotic processes.
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Affiliation(s)
- Bulat Faizullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Irina Dayanova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Igor Strelnik
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Kirill Kholin
- Department of Nanotechnology in Electronics, Kazan National Research Technical University Named after A.N. Tupolev-KAI, 10 K. Marx Street, 420111 Kazan, Russia
| | - Irek Nizameev
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Aidar Gubaidullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Alexandra Voloshina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Tatiana Gerasimova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Ilya Kashnik
- Nikolaev Institute of Inorganic Chemistry, SB RAS, 3 Academician Lavrentiev Avenue, 630090 Novosibirsk, Russia
| | - Konstantin Brylev
- Nikolaev Institute of Inorganic Chemistry, SB RAS, 3 Academician Lavrentiev Avenue, 630090 Novosibirsk, Russia
| | - Guzel Sibgatullina
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, 2/31 Lobachevski Street, 420111 Kazan, Russia
| | - Dmitry Samigullin
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, 2/31 Lobachevski Street, 420111 Kazan, Russia
- Institute for Radio-Electronics and Telecommunications, Kazan National Research Technical University Named after A.N. Tupolev-KAI, 10 K. Marx Street, 420111 Kazan, Russia
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Elvira Musina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Andrey Karasik
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
| | - Asiya Mustafina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia
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12
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Faizullin B, Gubaidullin A, Gerasimova T, Kashnik I, Brylev K, Kholin K, Nizameev I, Voloshina A, Sibgatullina G, Samigullin D, Petrov K, Musina E, Karasik A, Mustafina A. “Proton sponge” effect and apoptotic cell death mechanism of Ag -Re6 nanocrystallites derived from the assembly of [{Re6S8}(OH)6–(H2O) ]4 with Ag+ ions. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129312] [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: 11/03/2022]
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Yakimova L, Kunafina A, Nugmanova A, Padnya P, Voloshina A, Petrov K, Stoikov I. Structure-Activity Relationship of the Thiacalix[4]arenes Family with Sulfobetaine Fragments: Self-Assembly and Cytotoxic Effect against Cancer Cell Lines. Molecules 2022; 27:molecules27041364. [PMID: 35209152 PMCID: PMC8879733 DOI: 10.3390/molecules27041364] [Citation(s) in RCA: 2] [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] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 02/14/2022] [Accepted: 02/14/2022] [Indexed: 11/16/2022]
Abstract
Regulating the structure of macrocyclic host molecules and supramolecular assemblies is crucial because the structure-activity relationship often plays a role in governing the properties of these systems. Herein, we propose and develop an approach to the synthesis of the family of sulfobetaine functionalized thiacalix[4]arenes with regulation of the self-assembly and cytotoxic effect against cancer cell lines. The dynamic light scattering method showed that the synthesized macrocycles in cone, partial cone and 1,3-alternate conformations form submicron-sized particles with Ag+ in water, but the particle size and polydispersity of the systems studied depend on the macrocycle conformation. Based on the results obtained by 1H and 1H-1H NOESY NMR spectroscopy and transmission electron microscopy for the macrocycles and their aggregates with Ag+, a coordination scheme for the Ag+ and different conformations of p-tert-butylthiacalix[4]arene functionalized with sulfobetaine fragments was proposed. The type of coordination determines the different shapes of the associates. Cytotoxic properties are shown to be controlled by the shape of associates, with the highest activity demonstrated by thiacalix[4]arenes in partial cone conformation. This complex partial cone/Ag+ is two times higher than the reference drug imatinib mesylate. High selectivity against cervical carcinoma cell line indicates the prospect of their using as components of new anticancer system.
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Affiliation(s)
- Luidmila Yakimova
- A.M. Butlerov’ Chemistry Institute, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia; (A.K.); (A.N.); (P.P.)
- Correspondence: (L.Y.); (I.S.); Tel.: +7-843-233-7241 (I.S.)
| | - Aisylu Kunafina
- A.M. Butlerov’ Chemistry Institute, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia; (A.K.); (A.N.); (P.P.)
| | - Aigul Nugmanova
- A.M. Butlerov’ Chemistry Institute, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia; (A.K.); (A.N.); (P.P.)
| | - Pavel Padnya
- A.M. Butlerov’ Chemistry Institute, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia; (A.K.); (A.N.); (P.P.)
| | - Alexandra Voloshina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia; (A.V.); (K.P.)
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, 420088 Kazan, Russia; (A.V.); (K.P.)
| | - Ivan Stoikov
- A.M. Butlerov’ Chemistry Institute, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia; (A.K.); (A.N.); (P.P.)
- Correspondence: (L.Y.); (I.S.); Tel.: +7-843-233-7241 (I.S.)
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Vorotnikov I, Kolotyrin K, Petrov K. Using Public-Private Partnership Tools to Reduce the Negative Environmental Impact of Meat Processing Plants. BIO Web Conf 2022. [DOI: 10.1051/bioconf/20224303040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The issues of reducing the negative environmental impact of meat processing enterprises on the environment are considered. Various types of pollution are analyzed, and the most dangerous sources of pollution are identified. On the basis of the studied references, it is concluded that the solution of the problems of environmental pollution by meat processing enterprises is possible only if economic conditions are created that make environmental projects in the studied sphere of production profitable from an economic point of view. Introduction of modern technologies for processing of raw meat requires significant costs and motivation of all participants associated with production of meat products. In order to solve the problems listed above, it is offered to use tools of public-private partnership in the meat industry in implementation of environmental projects. Particular emphasis is placed on encouraging private investors from the state to reduce the environmental burden on the environment on the basis of various preferential programs and subsidies. The offered instruments of public-private partnership made it possible to achieve an optimal combination between the environmental and economic interests of all participants in the environmental protection process. It is offered to use various forms, such as concession, delegation of management, concession, and etc. as instruments of public-private partnership. It is noted that use of public-private partnerships in projects for environmental protection in the meat processing industry will minimize environmental risks, as well as reduce risks for investors. Use of public-private partnerships will also allow attracting additional sources of financing, ensuring information accessibility of production technologies and motivating meat processors to introduce resource-saving production technologies, which will ultimately affect environmental well-being.
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15
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Gaynanova G, Vasileva L, Kashapov R, Kuznetsova D, Kushnazarova R, Tyryshkina A, Vasilieva E, Petrov K, Zakharova L, Sinyashin O. Self-Assembling Drug Formulations with Tunable Permeability and Biodegradability. Molecules 2021; 26:6786. [PMID: 34833877 PMCID: PMC8624506 DOI: 10.3390/molecules26226786] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/07/2021] [Accepted: 11/08/2021] [Indexed: 12/11/2022] Open
Abstract
This review focuses on key topics in the field of drug delivery related to the design of nanocarriers answering the biomedicine criteria, including biocompatibility, biodegradability, low toxicity, and the ability to overcome biological barriers. For these reasons, much attention is paid to the amphiphile-based carriers composed of natural building blocks, lipids, and their structural analogues and synthetic surfactants that are capable of self-assembly with the formation of a variety of supramolecular aggregates. The latter are dynamic structures that can be used as nanocontainers for hydrophobic drugs to increase their solubility and bioavailability. In this section, biodegradable cationic surfactants bearing cleavable fragments are discussed, with ester- and carbamate-containing analogs, as well as amino acid derivatives received special attention. Drug delivery through the biological barriers is a challenging task, which is highlighted by the example of transdermal method of drug administration. In this paper, nonionic surfactants are primarily discussed, including their application for the fabrication of nanocarriers, their surfactant-skin interactions, the mechanisms of modulating their permeability, and the factors controlling drug encapsulation, release, and targeted delivery. Different types of nanocarriers are covered, including niosomes, transfersomes, invasomes and chitosomes, with their morphological specificity, beneficial characteristics and limitations discussed.
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Affiliation(s)
- Gulnara Gaynanova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russia; (L.V.); (R.K.); (D.K.); (R.K.); (A.T.); (E.V.); (K.P.); (L.Z.); (O.S.)
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16
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Zueva I, Lushchekina S, Shulnikova P, Lenina O, Petrov K, Molochkina E, Masson P. α-tocopherol, a slow-binding inhibitor of acetylcholinesterase. Chem Biol Interact 2021; 348:109646. [PMID: 34506764 DOI: 10.1016/j.cbi.2021.109646] [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: 05/27/2021] [Revised: 08/03/2021] [Accepted: 09/06/2021] [Indexed: 11/29/2022]
Abstract
Acetylcholinesterase (AChE) is reversibly inhibited by α-tocopherol (α-T). Steady state kinetic analysis shows that α-T is a mixed slow-binding inhibitor of type A of human enzyme (Kci = 0.49 μM; Kui = 1.6 μM) with a residence time of 2 min on target. Molecular dynamics (MD) simulations support this mechanism, and indicate that α-T first forms multiple non-specific interactions with AChE surface near the gorge entrance, then binds to the peripheral side with alkylene chain slowly sliding down the gorge, inducing no significant conformational change. α-T slightly modulates the progressive inhibition of AChE by the cyclic organophosphorus, cresyl saligenylphosphate, accelerating the fast pseudo-first order process of phosphorylation. A moderate accelerating effect of α-T on phosphorylation by paraoxon was also observed after pre-incubation of AChE in the presence of α-T. This accelerating effect of α-T on ex vivo paraoxon-induced diaphragm muscle weakness was also observed. The effect of α-T on AChE phosphylation was interpreted in light of molecular modeling results. From all results it is clear that α-T does not protect AChE against phosphylation by organophosphorus.
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Affiliation(s)
- Irina Zueva
- Arbuzov Institute of Organic and Physical Chemistry, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Arbuzov str., 8, Kazan, 420088, Russian Federation
| | - Sofya Lushchekina
- Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin str 4, Moscow, 119334, Russian Federation
| | - Polina Shulnikova
- Kazan Federal University, Neuropharmacology Laboratory, Kremlevskaya str 18, 480002, Kazan, Russian Federation
| | - Oksana Lenina
- Arbuzov Institute of Organic and Physical Chemistry, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Arbuzov str., 8, Kazan, 420088, Russian Federation
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Arbuzov str., 8, Kazan, 420088, Russian Federation
| | - Elena Molochkina
- Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin str 4, Moscow, 119334, Russian Federation
| | - Patrick Masson
- Kazan Federal University, Neuropharmacology Laboratory, Kremlevskaya str 18, 480002, Kazan, Russian Federation.
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Zueva I, Lenina O, Kayumova R, Petrov K, Masson P. Protective effects of m-(tert-butyl) trifluoroacetophenone, a transition state analogue of acetylcholine, against paraoxon toxicity and memory impairments. Chem Biol Interact 2021; 345:109558. [PMID: 34147486 DOI: 10.1016/j.cbi.2021.109558] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 05/18/2021] [Accepted: 06/15/2021] [Indexed: 11/29/2022]
Abstract
m-(Tert-butyl) trifluoroacetophenone (TFK), a slow-binding inhibitor of acetylcholinesterase (AChE), a transition state analog of acetylcholine, was investigated as a potential neuroprotectant of central and peripheral AChE against organophosphate paraoxon (POX) toxicity. Acute toxicity and pharmacological effects of TFK were investigated on mice and rats. Intraperitoneal administered TFK has low acute toxicity in mice (LD50 ≈ 19 mg/kg). Effects on motor function as investigated by rotarod and open field tests showed that TFK up to 5 mg/kg did not alter motor coordination and stereotypical exploration behavior of mice. Passive avoidance test showed that 1 or 5 mg/kg TFK restored memory impairment in scopolamine-induced Alzheimer's disease-like dementia in rats. Pretreatment of mice with 5 mg/kg TFK, 2-3 h before challenge by 2xLD50 POX provided a modest and short protection against POX toxicity. Futhermore, analysis of POX-induced neuronal degeneration by using fluoro-jade B staining showed that TFK pretreatment, at the dose 5 mg/kg before POX challenge, significantly reduced the density of apoptotic cells in hippocampus and entorhinal cortex of mice. Thus, TFK is capable of reducing POX-induced neurotoxicity.
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Affiliation(s)
- Irina Zueva
- Arbuzov Institute of Organic and Physical Chemistry, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Arbuzov Str., 8, Kazan, 420088, Russian Federation
| | - Oksana Lenina
- Arbuzov Institute of Organic and Physical Chemistry, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Arbuzov Str., 8, Kazan, 420088, Russian Federation
| | - Ramilya Kayumova
- Arbuzov Institute of Organic and Physical Chemistry, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Arbuzov Str., 8, Kazan, 420088, Russian Federation
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Arbuzov Str., 8, Kazan, 420088, Russian Federation; Kazan Federal University, Neuropharmacology Laboratory, Kremlevskaya Str 18, Kazan, 480002, Russian Federation
| | - Patrick Masson
- Kazan Federal University, Neuropharmacology Laboratory, Kremlevskaya Str 18, Kazan, 480002, Russian Federation.
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18
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Khazieva A, Kholin K, Nizameev I, Brylev K, Kashnik I, Voloshina A, Lyubina A, Gubaidullin A, Daminova A, Petrov K, Mustafina A. Surface modification of silica nanoparticles by hexarhenium anionic cluster complexes for pH-sensing and staining of cell nuclei. J Colloid Interface Sci 2021; 594:759-769. [PMID: 33789187 DOI: 10.1016/j.jcis.2021.03.082] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 12/28/2020] [Revised: 03/05/2021] [Accepted: 03/13/2021] [Indexed: 11/29/2022]
Abstract
The surface deposition of luminescent anionic cluster complex [{Re6S8}(OH)6]4- advantages to the design and synthesis of composite luminescent silica nanoparticles (SNs) for intracellular imaging and sensing, while the encapsulation of the cluster units into SNs lacks for efficient luminescence. The deposition of the Re6 clusters resulted from their assembly at the silica surface functionalized by amino-groups provides the synthetic route for the composite SNs with bright cluster-centered luminescence invariable in pH range from 4.0 to 12.0. The pH-dependent supramolecular assembly of the cluster units with polyethyleneimine (PEI) at the silica surface is an alternative route for the synthesis of the composite SNs with high cluster-centered luminescence sensitive to pH-changes within 4.0-6.0. The sensitivity derives from the pH-driven conformational changes of PEI chains resulting in the release of the clusters from the PEI-based confinement under the acidification within pH 6.0-4.0. The potential of the composite SNs in cellular contrasting has been also revealed by the cell viability and flow cytometry measurements. It has been found that the PEI-supported embedding of the cluster units facilitates cell internalization of the composite SNs as well as results in specific intracellular distribution manifested by efficient staining of the cell nuclei in the confocal images.
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Affiliation(s)
- Alsu Khazieva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., 420088 Kazan, Russian Federation.
| | - Kirill Kholin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., 420088 Kazan, Russian Federation
| | - Irek Nizameev
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., 420088 Kazan, Russian Federation
| | - Konstantin Brylev
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russian Federation
| | - Ilya Kashnik
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russian Federation
| | - Alexandra Voloshina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., 420088 Kazan, Russian Federation
| | - Anna Lyubina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., 420088 Kazan, Russian Federation
| | - Aidar Gubaidullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., 420088 Kazan, Russian Federation
| | - Amina Daminova
- Kazan (Volga region) Federal University, 18 Kremlyovskaya str., 420008 Kazan, Russian Federation
| | - Konstantin Petrov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., 420088 Kazan, Russian Federation
| | - Asiya Mustafina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., 420088 Kazan, Russian Federation
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Todorova S, Abrashev B, Rangelova V, Mihaylov L, Vassileva E, Petrov K, Spassov T. Hydrogen Gas Phase and Electrochemical Hydriding of LaNi 5-xM x (M = Sn, Co, Al) Alloys. Materials (Basel) 2020; 14:ma14010014. [PMID: 33375180 PMCID: PMC7792962 DOI: 10.3390/ma14010014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/14/2020] [Accepted: 12/16/2020] [Indexed: 06/12/2023]
Abstract
Hydriding/dehydriding properties of a series of LaNi5 based alloys were compared by applying both hydrogen gas phase and electrochemical hydrogen charge/discharge methods. The highest hydrogen absorption capacity of 1.4 wt.% H2 was found for LaNi4.3Co0.4Al0.3, although LaNi4.8Sn0.2 also reveals comparable hydrogen capacity (>1.3%). A significant difference in the hydriding kinetics was observed for all studied alloys before and after activation. The activated alloys (5 cycles at 65 °C, 40 atm. H2) reach their maximum capacities after less than a minute, whereas the pure LaNi5 alloy needs several minutes for complete hydriding. The electrochemical hydriding/dehydriding behavior of the alloys reveals superior performance of LaNi4.3Co0.4Al0.3 and LaNi4.8Sn0.2 compared to the other compositions studied, as the capacity of LaNi4.8Sn0.2 decreases by only 10% for 60 charge/discharge cycles at a current density of 100 mA/g. Good agreement between the hydrogen sorption kinetics of the alloys obtained electrochemically and from hydrogen gas phase has also been observed.
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Affiliation(s)
- Stanislava Todorova
- Faculty of Chemistry and Pharmacy, Sofia University “St. Kl. Ohridski”, 1 James Bourchier Blvd., 1164 Sofia, Bulgaria; (S.T.); (V.R.); (L.M.); (E.V.)
| | - Borislav Abrashev
- Institute of Electrochemistry and Energy Systems, Acad. Evgeni Budevski, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 10, 1113 Sofia, Bulgaria; (B.A.); (K.P.)
| | - Vesselina Rangelova
- Faculty of Chemistry and Pharmacy, Sofia University “St. Kl. Ohridski”, 1 James Bourchier Blvd., 1164 Sofia, Bulgaria; (S.T.); (V.R.); (L.M.); (E.V.)
| | - Lyuben Mihaylov
- Faculty of Chemistry and Pharmacy, Sofia University “St. Kl. Ohridski”, 1 James Bourchier Blvd., 1164 Sofia, Bulgaria; (S.T.); (V.R.); (L.M.); (E.V.)
| | - Evelina Vassileva
- Faculty of Chemistry and Pharmacy, Sofia University “St. Kl. Ohridski”, 1 James Bourchier Blvd., 1164 Sofia, Bulgaria; (S.T.); (V.R.); (L.M.); (E.V.)
| | - Konstantin Petrov
- Institute of Electrochemistry and Energy Systems, Acad. Evgeni Budevski, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 10, 1113 Sofia, Bulgaria; (B.A.); (K.P.)
| | - Tony Spassov
- Faculty of Chemistry and Pharmacy, Sofia University “St. Kl. Ohridski”, 1 James Bourchier Blvd., 1164 Sofia, Bulgaria; (S.T.); (V.R.); (L.M.); (E.V.)
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Kashapov R, Gaynanova G, Gabdrakhmanov D, Kuznetsov D, Pavlov R, Petrov K, Zakharova L, Sinyashin O. Self-Assembly of Amphiphilic Compounds as a Versatile Tool for Construction of Nanoscale Drug Carriers. Int J Mol Sci 2020; 21:E6961. [PMID: 32971917 PMCID: PMC7555343 DOI: 10.3390/ijms21186961] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 09/18/2020] [Accepted: 09/19/2020] [Indexed: 12/12/2022] Open
Abstract
This review focuses on synthetic and natural amphiphilic systems prepared from straight-chain and macrocyclic compounds capable of self-assembly with the formation of nanoscale aggregates of different morphology and their application as drug carriers. Since numerous biological species (lipid membrane, bacterial cell wall, mucous membrane, corneal epithelium, biopolymers, e.g., proteins, nucleic acids) bear negatively charged fragments, much attention is paid to cationic carriers providing high affinity for encapsulated drugs to targeted cells. First part of the review is devoted to self-assembling and functional properties of surfactant systems, with special attention focusing on cationic amphiphiles, including those bearing natural or cleavable fragments. Further, lipid formulations, especially liposomes, are discussed in terms of their fabrication and application for intracellular drug delivery. This section highlights several features of these carriers, including noncovalent modification of lipid formulations by cationic surfactants, pH-responsive properties, endosomal escape, etc. Third part of the review deals with nanocarriers based on macrocyclic compounds, with such important characteristics as mucoadhesive properties emphasized. In this section, different combinations of cyclodextrin platform conjugated with polymers is considered as drug delivery systems with synergetic effect that improves solubility, targeting and biocompatibility of formulations.
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Affiliation(s)
- Ruslan Kashapov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Arbuzov street 8, Kazan 420088, Russia; (G.G.); (D.G.); (D.K.); (R.P.); (K.P.); (L.Z.); (O.S.)
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Zueva I, Dias J, Lushchekina S, Semenov V, Mukhamedyarov M, Pashirova T, Babaev V, Nachon F, Petrova N, Nurullin L, Zakharova L, Ilyin V, Masson P, Petrov K. New evidence for dual binding site inhibitors of acetylcholinesterase as improved drugs for treatment of Alzheimer's disease. Neuropharmacology 2019; 155:131-141. [DOI: 10.1016/j.neuropharm.2019.05.025] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 05/06/2019] [Accepted: 05/19/2019] [Indexed: 01/22/2023]
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Fedorenko S, Stepanov A, Sibgatullina G, Samigullin D, Mukhitov A, Petrov K, Mendes R, Rümmeli M, Giebeler L, Weise B, Gemming T, Nizameev I, Kholin K, Mustafina A. Fluorescent magnetic nanoparticles for modulating the level of intracellular Ca 2+ in motoneurons. Nanoscale 2019; 11:16103-16113. [PMID: 31432850 DOI: 10.1039/c9nr05071j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This report introduces both synthesis and in vitro biological behaviour of dual magnetic-fluorescent silica nanoparticles. The amino group-decoration of 78 nm sized silica nanoparticles enables their efficient internalization into motoneurons, which is visualized by the red fluorescence arising from [Ru(dipy)3]2+ complexes encapsulated into a silica matrix. The internalized nanoparticles are predominantly located in the cell cytoplasm as revealed by confocal microscopy imaging. The magnetic function of the nanoparticles resulted from the incorporation of 17 nm sized superparamagnetic iron oxide cores into the silica matrix, enabling their responsivity to magnetic fields. Fluorescence analysis revealed the "on-off" switching of Ca2+ influx under the application and further removal of the permanent magnetic field. This result for the first time highlights the movement of the nanoparticles within the cell cytoplasm in the permanent magnetic field as a promising tool to enhance the neuronal activity of motoneurons.
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Affiliation(s)
- Svetlana Fedorenko
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan, Russia.
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Enache S, Dragan M, Varlam M, Petrov K. Electronic Percolation Threshold of Self-Standing Ag-LaCoO 3 Porous Electrodes for Practical Applications. Materials (Basel) 2019; 12:ma12152359. [PMID: 31349536 PMCID: PMC6696329 DOI: 10.3390/ma12152359] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/18/2019] [Accepted: 07/23/2019] [Indexed: 11/23/2022]
Abstract
Perovskite LaCoO3 materials have various applications, from selective permeable membranes and gas sensing devices to water splitting applications. However, the intrinsic electrical resistivity of the perovskite limits the applicative potential. To overcome that, Ag powder was used with LaCoO3 to obtain porous composite electrodes with enhanced conductivities. For that, a series of composite Ag-LaCoO3 powders were prepared into pellets and pre-sintered at various temperatures up to 1000 ∘C. Their structural properties and morphology were investigated by X-ray diffraction and scanning electron microscopy. The electronic transport of compacted specimens was studied by impedance spectroscopy. The results indicate that the presence of Ag acts as pre-sintering additive to obtain porous electrodes, with porosity values as high as 40% at 50 vol. % Ag. Moreover, the overall electrical resistivity of the composite electrodes varied well over four orders of magnitude. The results are discussed within the generalized Bruggeman theory for effective media comprising arbitrarily shaped metallic and semiconducting inclusions.
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Affiliation(s)
- Stanica Enache
- National Research and Development Institute for Cryogenics and Isotopic Technologies-ICIT Rm. Vâlcea, 4th Uzinei Str., P.O. Box 7 Râureni, 240050 Vâlcea, Romania.
| | - Mirela Dragan
- National Research and Development Institute for Cryogenics and Isotopic Technologies-ICIT Rm. Vâlcea, 4th Uzinei Str., P.O. Box 7 Râureni, 240050 Vâlcea, Romania.
| | - Mihai Varlam
- National Research and Development Institute for Cryogenics and Isotopic Technologies-ICIT Rm. Vâlcea, 4th Uzinei Str., P.O. Box 7 Râureni, 240050 Vâlcea, Romania
| | - Konstantin Petrov
- Acad. Evgeni Budevski Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl.10, 1113 Sofia, Bulgaria
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Lenina O, Petrov K, Kovyazina I, Malomouzh A. Enhancement of mouse diaphragm contractility in the presence of antagonists of GABA A and GABA B receptors. Exp Physiol 2019; 104:1004-1010. [PMID: 31074160 DOI: 10.1113/ep087611] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 05/07/2019] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the central question of this study? Do GABA receptors play any role at the neuromuscular junction? What is the main finding and its importance? In the presence of either ionotropic or metabotropic GABA receptor antagonists, diaphragm muscle force production elicited by stimulating the motor nerve at ≥50 Hz was increased. Our data indicate the presence of GABAergic signalling at the neuromuscular junction. ABSTRACT Despite the signalling role of GABA in the brain and spinal cord, the role of this molecule in the peripheral nervous system and, in particular, at the neuromuscular junction remains practically unexplored. In the present work, the force of mouse diaphragm contractions was measured in the presence of blockers of metabotropic GABAB receptors (CGP 55845) and ionotropic GABAA receptors (picrotoxin) with various patterns of indirect and direct stimulation of muscle by trains of 40 pulses delivered at 10, 20, 50 and 70 Hz. It was found that neither blocker affected the diaphragm contractility caused by indirect stimulation through the motor nerve at 10 and 20 Hz. However, when the stimulation frequency was increased to 50 or 70 Hz, the force of subsequent contractions in the train (when compared with the amplitude of contraction in response to the first pulse) was increased by both CGP 55845 and picrotoxin. With direct stimulation of the diaphragm, no significant changes in the contraction force were detected at any frequency used. The results obtained support the following conclusions: (i) pharmacological inhibition of GABA receptors increases the contractile activity of skeletal muscle; and (ii) frequency-dependent enhancement of GABA receptor activation takes place in the region of the neuromuscular junction.
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Affiliation(s)
- Oksana Lenina
- A. E. Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan, Russia
| | - Konstantin Petrov
- A. E. Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan, Russia.,Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan, Russia.,Neuropharmacology Laboratory, Kazan Federal University, Kazan, Russia
| | - Irina Kovyazina
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan, Russia.,Neuropharmacology Laboratory, Kazan Federal University, Kazan, Russia.,Department of Medical and Biological Physics, Kazan State Medical University, Kazan, Russia
| | - Artem Malomouzh
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan, Russia.,Neuropharmacology Laboratory, Kazan Federal University, Kazan, Russia
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Elistratova J, Mukhametshina A, Kholin K, Nizameev I, Mikhailov M, Sokolov M, Khairullin R, Miftakhova R, Shammas G, Kadirov M, Petrov K, Rizvanov A, Mustafina A. Interfacial uploading of luminescent hexamolybdenum cluster units onto amino-decorated silica nanoparticles as new design of nanomaterial for cellular imaging and photodynamic therapy. J Colloid Interface Sci 2019; 538:387-396. [DOI: 10.1016/j.jcis.2018.12.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 11/30/2018] [Accepted: 12/03/2018] [Indexed: 12/14/2022]
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Pechlivanova D, Petrov K, Grozdanov P, Nenchovska Z, Tchekalarova J, Stoynev A. Intracerebroventricular infusion of angiotensin AT2 receptor agonist novokinin aggravates some diabetes-mellitus-induced alterations in Wistar rats. Can J Physiol Pharmacol 2018; 96:471-478. [DOI: 10.1139/cjpp-2017-0428] [Citation(s) in RCA: 3] [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] [Indexed: 12/26/2022]
Abstract
Cumulative data suggest the significant role of the renin–angiotensin system in the development of the pathological consequences of diabetes mellitus (DM). Newly synthesized AT2 receptor agonists gained importance as a target for creating new antihypertensives. The aim of the present work was to study the effects of peptide AT2 agonist novokinin, infused intracerebroventricularly, on the consequences of the streptozotocin-induced type 1 DM (T1DM) in Wistar rats. Food and water consumption, body mass, urine excretion (metabolic cages), motor activity (open-field test), anxiety (elevated plus maze), nociception (paw pressure analgesimeter test), spatial memory (T-maze alternation test), and plasma levels of glucose and corticosterone (ELISA) were assessed 2 weeks after the T1DM induction. Novokinin increased water and food consumption, as well as urine output, and reduced mass gain in the control rats. Diabetic rats demonstrated hyperalgesia, increased level of plasma corticosterone, decreased motor and exploratory activity, and impaired spatial memory. Novokinin infusion increased water intake, diuresis, and mortality rate, decreased food intake, exacerbated diabetes-induced hyperalgesia, and provoked anxiety-like behavior but improved spatial memory in diabetic rats. These initial data suggest that angiotensin AT2 receptors participate in the pathogenesis of T1DM-induced complications in the function of the nervous system.
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Affiliation(s)
- D. Pechlivanova
- Institute of Neurobiology, Bulgarian Academy of Sciences, 23 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
| | - K. Petrov
- Department of Pathophysiology, Medical University-Sofia, 1 Georgi Sofiiski Str., 1431 Sofia, Bulgaria
| | - P. Grozdanov
- Institute of Microbiology, Bulgarian Academy of Sciences, 23 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
| | - Z. Nenchovska
- Institute of Neurobiology, Bulgarian Academy of Sciences, 23 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
| | - J. Tchekalarova
- Institute of Neurobiology, Bulgarian Academy of Sciences, 23 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
| | - A. Stoynev
- Department of Pathophysiology, Medical University-Sofia, 1 Georgi Sofiiski Str., 1431 Sofia, Bulgaria
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Petrov K, Kijak T, Schulz T. [Rare cause of epigastric pain with spontaneous improvement without previous abdominal surgery]. Chirurg 2018; 89:730-732. [PMID: 29445856 DOI: 10.1007/s00104-018-0608-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- K Petrov
- Klinik für Allgemein‑, Viszeral‑, Thorax- und minimal-invasive Chirurgie, Siloah St. Trudpert Klinikum Pforzheim, Wilferdinger Straße 67, 75179, Pforzheim, Deutschland.
| | - T Kijak
- Klinik für Allgemein‑, Viszeral‑, Thorax- und minimal-invasive Chirurgie, Siloah St. Trudpert Klinikum Pforzheim, Wilferdinger Straße 67, 75179, Pforzheim, Deutschland
| | - T Schulz
- Klinik für Allgemein‑, Viszeral‑, Thorax- und minimal-invasive Chirurgie, Siloah St. Trudpert Klinikum Pforzheim, Wilferdinger Straße 67, 75179, Pforzheim, Deutschland
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Mukhametshina A, Petrov A, Fedorenko S, Petrov K, Nizameev I, Mustafina A, Sinyashin O. Luminescent nanoparticles for rapid monitoring of endogenous acetylcholine release in mice atria. LUMINESCENCE 2018; 33:588-593. [PMID: 29377578 DOI: 10.1002/bio.3450] [Citation(s) in RCA: 8] [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: 09/11/2017] [Revised: 11/20/2017] [Accepted: 12/11/2017] [Indexed: 01/06/2023]
Abstract
The present work introduces for the first time a nanoparticulate approach for ex vivo monitoring of acetylcholinesterase-catalyzed hydrolysis of endogenous acetylcholine released from nerve varicosities in mice atria. Amino-modified 20-nm size silica nanoparticles (SNs) doped by luminescent Tb(III) complexes were applied as the nanosensors. Their sensing capacity results from the decreased intensity of Tb(III)-centred luminescence due to the quenching effect of acetic acid derived from acetylcholinesterase-catalyzed hydrolysis of acetylcholine. Sensitivity of the SNs in monitoring acetylcholine hydrolysis was confirmed by in vitro experiments. Isolated atria were exposed to the nanosensors for 10 min to stain cell membranes. Acetylcholine hydrolysis was monitored optically in the atria samples by measuring quenching of Tb(III)-centred luminescence by acetic acid derived from endogenous acetylcholine due to its acetylcholinesterase-catalyzed hydrolysis. The reliability of the sensing was demonstrated by the quenching effect of exogenous acetylcholine added to the bath solution. Additionally, no luminescence quenching occurred when the atria were pre-treated with the acetylcholinesterase inhibitor paraoxon.
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Affiliation(s)
- Alsu Mukhametshina
- A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Alexey Petrov
- Department of Normal Physiology, Kazan State Medial University, Kazan, Russian Federation.,Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, Kazan, Russian Federation
| | - Svetlana Fedorenko
- A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Konstantin Petrov
- A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Irek Nizameev
- A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Asiya Mustafina
- A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
| | - Oleg Sinyashin
- A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russian Federation
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Lushchekina S, Kots E, Kharlamova A, Petrov K, Masson P. Molecular modeling of mechanism of action of anti-myasthenia gravis slow-binding inhibitor of acetylcholinesterase. Int J Risk Saf Med 2015; 27 Suppl 1:S74-5. [PMID: 26639721 DOI: 10.3233/jrs-150696] [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] [Indexed: 11/15/2022]
Abstract
BACKGROUND Myasthenia gravis (MG) is a chronic autoimmune neuromuscular disorder characterized by fluctuating weakness of voluntary skeletal muscles. The cause of autoimmune response is unknown and only symptomatic therapies for MG are currently available. Pharmacological correction of synaptic failure underlying MG, involves partial inhibition acetyl- and butyrylcholinesterase. Effectiveness of cholinesterase inhibitors in the symptomatic treatment of MG is based on their ability to potentiate the effects of acetylcholine by decreasing the rate of its enzymatic hydrolysis at neuromuscular junctions. Several new inhibitors of AChE were tested in animal model of MG and may be considered as valuable candidates for the treatment of pathological muscle weakness syndromes. In this study, we have investigated mechanisms of ChE inhibition by one of the most active 6-methyluracil derivatives (C547), as well as the possible benefits of using this compound for MG treatment compared to traditionally used pyridostigmine bromide.It was experimentally shown that C547 is a «pseudo-irreversible» slow-binding inhibitor of human AChE. Human BChE is reversibly inhibited by C547 with an affinity about 4 orders of magnitude lower than that of human AChE. Slow-binding inhibition of AChE leads to a lasting (over 24 hours) effect on the symptoms of muscle weakness in animal model of MG after a single administration of C547. OBJECTIVE The aim of the present molecular modeling study was to reveal mechanism of AChE inhibition by C547 and elucidate its apparent «pseudo-irreversibility». METHODS Two principle methods used in the present study were molecular docking and molecular dynamics (MD). Molecular docking was performed with Autodock 4.2.6 software, Lamarckian Genetic Algorithm to obtain structure of protein inhibitor complexes and Local Search for MD snapshots to compare relative binding affinity. For MD simulations NAMD 2.10 software with Charrm 36 force field was used, for the ligand C547 Charmm General Force Field was used, and missing parameters were obtained with quantum mechanical calculations. Unconstrained MD, steered MD (SMD) and free energy calculations with adaptive biasing force were performed. RESULTS During unconstrained MD, C547 very rapidly binded to the peripheral anionic site (PAS) of AChE. To pass the bottleneck, application of the external force was required (SMD). Both SMD modelling and free energy calculation revealed that after crossing the AChE bottleneck, C547 falls into very favorable position. At the same time the rupture of interactions as well as overcoming the bottleneck gates in the course of pulling out procedure requires application of much higher force than during the pulling-in process. This difference between binding and dissociating processes explains apparent «pseudo-irreversibility» of the inhibitor. CONCLUSIONS These findings are in good agreement with kinetics study showing that C-547 is a slow-binding inhibitor of type B, i.e. after rapid initial binding of inhibitor, the enzyme-inhibitor complex undergoes an isomerization step. Position obtained by SMD is in good agreement with X-ray data obtained by F. Nachon, IBS, France.
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Affiliation(s)
- S Lushchekina
- Emanuel Institute of Biochemical Physics, RAS, Moscow, Russia
| | - E Kots
- Emanuel Institute of Biochemical Physics, RAS, Moscow, Russia.,Lomonosov Moscow State University, Chemistry Department, Moscow, Russia
| | - A Kharlamova
- Kazan Federal University, Kazan, Russia.,Arbuzov Institute of Organic and Physical Chemistry, KSC RAS, Kazan, Russia
| | - K Petrov
- Kazan Federal University, Kazan, Russia.,Arbuzov Institute of Organic and Physical Chemistry, KSC RAS, Kazan, Russia
| | - P Masson
- Kazan Federal University, Kazan, Russia
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Petrov K. Macrocyclic derivatives of 6-methyluracil: New ligands of the peripheral anionic site of acetylcholinesterase. JRS 2015; 27 Suppl 1:S72-3. [DOI: 10.3233/jrs-150695] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Vasileva E, Petrov K, Beschkov V. Biodegradation of Monochloroacetic Acid by Immobilization ofXanthobacter AutotrophicusGJ10 in Polyacrylamide Gel. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2009.10818541] [Citation(s) in RCA: 1] [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: 10/25/2022] Open
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Petrova V, Nedeva T, Petrov K, Kujumdzieva A. Restriction Analysis of Mitochondrial DNA: A Powerful Tool for Genetic Control of Industrial Fermentations. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2009.10817644] [Citation(s) in RCA: 1] [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: 10/25/2022] Open
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Lindovský J, Petrov K, Krůšek J, Reznik VS, Nikolsky EE, Vyskočil F. Effect of tissue-specific acetylcholinesterase inhibitor C-547 on α3β4 and αβεδ acetylcholine receptors in COS cells. Eur J Pharmacol 2012; 688:22-6. [DOI: 10.1016/j.ejphar.2012.05.010] [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] [Received: 02/05/2012] [Revised: 04/29/2012] [Accepted: 05/15/2012] [Indexed: 11/15/2022]
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Blossier B, Boucaud P, Brinet M, De Soto F, Du X, Morenas V, Pène O, Petrov K, Rodríguez-Quintero J. Strong running coupling at τ and Z(0) mass scales from lattice QCD. Phys Rev Lett 2012; 108:262002. [PMID: 23004967 DOI: 10.1103/physrevlett.108.262002] [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: 01/27/2012] [Indexed: 06/01/2023]
Abstract
This Letter reports on the first computation, from data obtained in lattice QCD with u, d, s, and c quarks in the sea, of the running strong coupling via the ghost-gluon coupling renormalized in the momentum-subtraction Taylor scheme. We provide readers with estimates of α(MS[over ¯])(m(τ)(2)) and α(MS[over ¯])(m(Z)(2)) in very good agreement with experimental results. Including a dynamical c quark makes the needed running of α(MS[over ¯]) safer.
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Affiliation(s)
- B Blossier
- Laboratoire de Physique Théorique, Université de Paris XI, Bâtiment 210, 91405 Orsay Cedex, France
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Petrov K, Kovyazina I, Zobov V, Bukharaeva E, Nikolsky EE, Vyskocil F. Different sensitivity of miniature endplate currents in rat external and internal intercostal muscles to the acetylcholinesterase inhibitor C-547 as compared with diaphragm and extensor digitorum longus. Physiol Res 2009; 58:149-153. [PMID: 19331513 DOI: 10.33549/physiolres.931698] [Citation(s) in RCA: 5] [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: 11/25/2022] Open
Abstract
Derivative of 6-methyluracil, selective cholinesterase inhibitor C-547 potentiates miniature endplate currents (MEPCs) in rat external intercostal muscles (external ICM) more effectively than in internal intercostal muscles (internal ICM). Effect of the C-547 on intercostal muscles was compared with those on extensor digitorum longus (EDL) and diaphragm muscles. Half-effective concentrations for tau of MEPC decay arranged in increasing order were as follows: EDL, locomotor muscle, most sensitive = 1.3 nM, external ICM, inspiration muscle = 6.8 nM, diaphragm, main inspiration muscle = 28 nM, internal ICM, expiration muscle = 71 nM. External ICM might therefore be inhibited, similarly as the limb muscles, by nanomolar concentrations of the drug and do not participate in inspiration in the presence of the C-547. Moreover, internal ICM inhibition can hinder the expiration during exercise-induced fast breathing of C-547- treated experimental animals.
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Affiliation(s)
- K Petrov
- A.E.Arbuzov Institute of Organic and Physical Chemistry, Russian Academy of Sciences, Kazan, Russia
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Petrov K, Petrova P. Isolation and Molecular Identification of Klebsiella Pneumoniae Strains, Producing Diols from Glycerol. BIOTECHNOL BIOTEC EQ 2009. [DOI: 10.1080/13102818.2009.10818547] [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: 10/25/2022] Open
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Gouliamova D, Dimitrov R, Petrova P, Stoyancheva G, Petrov K. Genomic Approaches to Yeast Taxonomy. BIOTECHNOL BIOTEC EQ 2009. [DOI: 10.1080/13102818.2009.10818477] [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: 10/25/2022] Open
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Petrova P, Gouliamova D, Petrov K, Stoyancheva G, Dimitrov R. Starch-Degrading Activities of Bulgarian Yeast Isolates. BIOTECHNOL BIOTEC EQ 2009. [DOI: 10.1080/13102818.2009.10818508] [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: 10/25/2022] Open
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Cheng M, Datta S, van der Heide J, Huebner K, Karsch F, Kaczmarek O, Laermann E, Liddle J, Mawhinney RD, Miao C, Petreczky P, Petrov K, Schmidt C, Soeldner W, Umeda T. The spatial string tension and dimensional reduction in QCD. Int J Clin Exp Med 2008. [DOI: 10.1103/physrevd.78.034506] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Boshkov N, Petrov K, Kovacheva D, Vitkova S, Nemska S. Influence of the alloying component on the protective ability of some zinc galvanic coatings. Electrochim Acta 2005. [DOI: 10.1016/j.electacta.2005.03.049] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kovacheva P, Todorovsky D, Radev D, Mavrudiev V, Petrov R, Kovacheva D, Petrov K. Mechanochemical effects in U3O8. J Radioanal Nucl Chem 2005. [DOI: 10.1007/s10967-005-0478-2] [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: 10/25/2022]
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Lazarraga MG, Pascual L, Gadjov H, Kovacheva D, Petrov K, Amarilla JM, Rojas RM, Martin-Luengo MA, Rojo JM. Nanosize LiNiyMn2 ? yO4 (0 < y ? 0.5) spinels synthesized by a sucrose-aided combustion method. Characterization and electrochemical performance. ACTA ACUST UNITED AC 2004. [DOI: 10.1039/b314157h] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Petkova I, Mateva L, Beniozef D, Petrov K, Thorn W. Sodium pyruvate infusions in patients with alcoholic liver disease. Preliminary report. Acta Physiol Pharmacol Bulg 2002; 25:103-8. [PMID: 11688547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Pyruvate has been shown to benefit cellular energy metabolism and to reduce free radical formation. Concerning gastrointestinal side effects of orally administered sodium pyruvate, in this pilot study we investigated the therapeutic effectiveness of sodium pyruvate infusions in patients with alcoholic liver disease (ALD). Fifteen patients with ALD received sodium pyruvate infusions for: (1) 10 days (54-86.4 g pyruvate daily, 150-180 mg/min., 6-8 h); and (2) 15 days (50-54 g daily, 100 mg/min., 6 h). Sodium pyruvate treatment resulted in significantly decreased serum AST (p<0.03), ALT (p<0.03), AP (p<0.004), GGT (p<0.05), and total bilirubin (p<0.04). Improvement of liver function was also evident from the significantly decreased Combined Clinical and Laboratory Index (from 6.50+/-0.71, to 3.92+/-0.84, p<0.001), and Liver Damage Score (from 3.83+/-0.71 to 2.75+/-0.58, p<0.01). The two therapy schedules used showed similar results. Unchanged serum pyruvate, lactate, and glucose confirmed the good utilization of pyruvate. Tolerance of sodium pyruvate treatment was very good in 26.09% and good in 68.94% of the observations. Our results showed good therapeutic effectiveness and good tolerance of sodium pyruvate infusions in patients with ALD. This is possibly due to the rapid gain of ATP and GTP, required to redress defective cells, and to antioxidant action of pyruvate.
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Affiliation(s)
- I Petkova
- Department of Pathophysiology, Medical University, Sofia, Bulgaria.
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Boshkov N, Vitkova S, Petrov K. Corrosion products of zinc-manganese coatings: part I—investigations using microprobe analysis and x-ray diffraction. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0026-0576(01)81437-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Atanasov M, Petrov K, Mirtcheva E, Friebel C, Reinen D. Cation Distribution and Coordination Chemistry of Cu(II) in Zn(II) Hydroxide Nitrate Solid Solutions: A Structural and Spectroscopic Study. J SOLID STATE CHEM 1995. [DOI: 10.1006/jssc.1995.1349] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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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Petrov K, Mirtcheva E, de Vidales J, Rojas R, Garcia-Martinez O. Preparation and x-ray diffraction characterization of the kambaldaite-like sodium cobalt carbonate hydroxide hydrate, Na2Co8(CO3)6(OH)6·6H2O. Polyhedron 1994. [DOI: 10.1016/s0277-5387(00)83107-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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