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Grinberg VY, Burova TV, Grinberg NV, Papkov VS, Khokhlov AR. Conformation-Dependent Affinity of Thermoresponsive Biodegradable Hydrogels for Multifunctional Ligands: A Differential Scanning Calorimetry Approach. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:14378-14387. [PMID: 30392359 DOI: 10.1021/acs.langmuir.8b03218] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigated energetics of binding of multifunctional pyranine ligands to hydrogels of the cross-linked poly(methoxyethylaminophosphazene) (PMOEAP) from data on the thermotropic volume phase transition of the gels by means of high-sensitivity differential scanning calorimetry. Dependences of the transition temperature, enthalpy, and width on the concentration of pyranines were obtained, and the excess transition free energy as a function of the pyranine concentration was calculated. We found that the affinity of the gels for the pyranine ligands increased very significantly upon the gel collapse. The intrinsic binding constants and free energies of binding of the ligands to the gels in the collapsed state were estimated from the DSC data. They revealed a significant increase in the hydrogel affinity for pyranines proportional to the number of anionic groups in the ligand structure. The affinity of the PMOEAP hydrogels for the multifunctional ligands was not affected by an increase in the cross-linking density of the gels and only slightly reduced by physiological salt concentrations.
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Affiliation(s)
- Valerij Y Grinberg
- A.N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , Vavilov St. 28 , Moscow 119991 , Russian Federation
- N.M. Emanuel Institute of Biochemical Physics of the Russian Academy of Sciences , Kosygin St. 4 , Moscow 119991 , Russian Federation
| | - Tatiana V Burova
- A.N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , Vavilov St. 28 , Moscow 119991 , Russian Federation
| | - Natalia V Grinberg
- A.N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , Vavilov St. 28 , Moscow 119991 , Russian Federation
| | - Vladimir S Papkov
- A.N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , Vavilov St. 28 , Moscow 119991 , Russian Federation
| | - Alexei R Khokhlov
- Physics Department , M.V. Lomonosov Moscow State University , Vorobyevy Gory , Moscow 119334 , Russian Federation
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Burova TV, Grinberg VY, Grinberg NV, Dubovik AS, Moskalets AP, Papkov VS, Khokhlov AR. Salt-Induced Thermoresponsivity of a Cationic Phosphazene Polymer in Aqueous Solutions. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01621] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tatiana V. Burova
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia
| | - Valerij Y. Grinberg
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin St. 4, Moscow 119991, Russia
| | - Natalia V. Grinberg
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia
| | - Alexander S. Dubovik
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin St. 4, Moscow 119991, Russia
| | - Alexander P. Moskalets
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia
| | - Vladimir S. Papkov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia
| | - Alexei R. Khokhlov
- M.V. Lomonosov Moscow
State University, Leninskie Gory 1, Moscow 119991, Russia
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Grinberg VY, Burova TV, Grinberg NV, Papkov VS, Dubovik AS, Khokhlov AR. Salt-Induced Thermoresponsivity of Cross-Linked Polymethoxyethylaminophosphazene Hydrogels: Energetics of the Volume Phase Transition. J Phys Chem B 2018; 122:1981-1991. [DOI: 10.1021/acs.jpcb.7b11288] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Valerij Y. Grinberg
- N.M.
Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin St. 4, 119334 Moscow, Russian Federation
| | - Tatiana V. Burova
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, 119991 Moscow, Russian Federation
| | - Natalia V. Grinberg
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, 119991 Moscow, Russian Federation
| | - Vladimir S. Papkov
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, 119991 Moscow, Russian Federation
| | - Alexander S. Dubovik
- N.M.
Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin St. 4, 119334 Moscow, Russian Federation
| | - Alexei R. Khokhlov
- M.V. Lomonosov Moscow State University, Physics
Department, Vorobyevy
Gory, 119992 Moscow, Russian Federation
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Effects of conformational ordering on protein/polyelectrolyte electrostatic complexation: ionic binding and chain stiffening. Sci Rep 2016; 6:23739. [PMID: 27030165 PMCID: PMC4814872 DOI: 10.1038/srep23739] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 03/14/2016] [Indexed: 11/23/2022] Open
Abstract
Coupling of electrostatic complexation with conformational transition is rather general in protein/polyelectrolyte interaction and has important implications in many biological processes and practical applications. This work studied the electrostatic complexation between κ-carrageenan (κ-car) and type B gelatin, and analyzed the effects of the conformational ordering of κ-car induced upon cooling in the presence of potassium chloride (KCl) or tetramethylammonium iodide (Me4NI). Experimental results showed that the effects of conformational ordering on protein/polyelectrolyte electrostatic complexation can be decomposed into ionic binding and chain stiffening. At the initial stage of conformational ordering, electrostatic complexation can be either suppressed or enhanced due to the ionic bindings of K+ and I− ions, which significantly alter the charge density of κ-car or occupy the binding sites of gelatin. Beyond a certain stage of conformational ordering, i.e., helix content θ > 0.30, the effect of chain stiffening, accompanied with a rapid increase in helix length ζ, becomes dominant and tends to dissociate the electrostatic complexation. The effect of chain stiffening can be theoretically interpreted in terms of double helix association.
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Burova TV, Grinberg NV, Dubovik AS, Shibanova ED, Grinberg VY. Conformational energetics of insulin in interpolyelectrolyte complexes insulin-poly(methylaminophosphazene) under near-physiological conditions. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.01.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Li J, Yang B, Qian Y, Wang Q, Han R, Hao T, Shu Y, Zhang Y, Yao F, Wang C. Iota-carrageenan/chitosan/gelatin scaffold for the osteogenic differentiation of adipose-derived MSCsin vitro. J Biomed Mater Res B Appl Biomater 2014; 103:1498-510. [DOI: 10.1002/jbm.b.33339] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 10/20/2014] [Accepted: 11/13/2014] [Indexed: 12/11/2022]
Affiliation(s)
- Junjie Li
- Department of Advanced Interdisciplinary Studies; Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences; No. 27, Taiping Road Beijing 100850 China
| | - Boguang Yang
- Department of Polymer Science and Key Laboratory of Systems Bioengineering of Ministry of Education; School of Chemical Engineering and Technology, Tianjin University; Tianjin 300072 China
| | - Yufeng Qian
- Department of Chemistry and Biochemistry; University of Texas at Austin; 2500 Speedway Austin Texas 78712
| | - Qiyu Wang
- Department of Advanced Interdisciplinary Studies; Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences; No. 27, Taiping Road Beijing 100850 China
| | - Ruijin Han
- Department of Advanced Interdisciplinary Studies; Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences; No. 27, Taiping Road Beijing 100850 China
| | - Tong Hao
- Department of Advanced Interdisciplinary Studies; Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences; No. 27, Taiping Road Beijing 100850 China
| | - Yao Shu
- Department of Advanced Interdisciplinary Studies; Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences; No. 27, Taiping Road Beijing 100850 China
- Department of Stomatology; Affiliated Hospital of Academy of Military Medical Sciences; Beijing 100071 China
| | - Yabin Zhang
- Department of Polymer Science and Key Laboratory of Systems Bioengineering of Ministry of Education; School of Chemical Engineering and Technology, Tianjin University; Tianjin 300072 China
| | - Fanglian Yao
- Department of Polymer Science and Key Laboratory of Systems Bioengineering of Ministry of Education; School of Chemical Engineering and Technology, Tianjin University; Tianjin 300072 China
| | - Changyong Wang
- Department of Advanced Interdisciplinary Studies; Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences; No. 27, Taiping Road Beijing 100850 China
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Burova TV, Grinberg NV, Tur DR, Papkov VS, Dubovik AS, Shibanova ED, Bairamashvili DI, Grinberg VY, Khokhlov AR. Ternary interpolyelectrolyte complexes insulin-poly(methylaminophosphazene)-dextran sulfate for oral delivery of insulin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2273-2281. [PMID: 23339768 DOI: 10.1021/la303860t] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ternary interpolyelectrolyte complexes of insulin with biodegradable synthetic cationic polymer, poly(methylaminophosphazene) hydrochloride (PMAP), and dextran sulfate (DS) were investigated by means of turbidimetry, dynamic light scattering, phase analysis, and high-sensitivity differential scanning calorimetry. Formation of ternary insoluble stoichiometric Insulin-PMAP-DS complexes was detected under conditions imitating the human gastric environment (pH 2, 0.15 M NaCl). A complete immobilization of insulin in the complexes was observed in a wide range of the reaction mixture compositions. The ternary complexes were shown to dissolve and dissociate under conditions imitating the human intestinal environment (pH 8.3, 0.15 M NaCl). The products of the complex dissociation were free insulin and soluble binary Insulin-PMAP complexes. The conformational stability of insulin in the soluble complexes of various compositions was investigated by high-sensitivity differential scanning calorimetry. The dependence of the excess denaturation free energy of insulin in these complexes on the PMAP content was obtained. The binding constants of the folded and unfolded forms of insulin to the PMAP polycation were estimated. Proteolysis of insulin involved in the insoluble ternary complexes by pepsin was investigated under physiological conditions. It was found that the complexes ensure an almost 100% protection of insulin against proteolytic degradation. The obtained results provide a perspective basis for development of oral insulin preparations.
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Affiliation(s)
- Tatiana V Burova
- AN Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russian Federation.
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Burova TV, Grinberg NV, Tur DR, Papkov VS, Dubovik AS, Grinberg VY, Khokhlov AR. Polyplexes of poly(methylaminophosphazene): energetics of DNA melting. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11582-11590. [PMID: 21830752 DOI: 10.1021/la202321t] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The interaction of DNA with a synthetic biocompatible and biodegradable cationic polymer, poly(methylaminophosphazene) hydrochloride (PMAP·HCl), was investigated by high-sensitivity differential scanning calorimetry under conditions of strong and weak electrostatic interactions of the macroions. Thermodynamic parameters of the DNA double-helix melting were determined as a function of pH and the PMAP·HCl/DNA weight ratio. PMAP·HCL was shown to reveal two functions with respect to DNA: the polyelectrolyte function and the donor-acceptor one. The first function stabilizes the helical conformation of DNA, and the second one destabilizes it. The stabilizing effect of PMAP·HCl is of entropic origin, related to a displacement of mobile counterions from the DNA's nearest surroundings by the poly(methylaminophosphazene) charged groups. The donor-acceptor function of poly(methylaminophosphazene) dominates when its electrostatic interaction with DNA is either saturated (in the complex coacervate phase at high poly(methylaminophosphazene) concentrations) or completely suppressed (in a salt medium when the polycation carries a small charge). Under these conditions, poly(methylaminophosphazene) destabilizes DNA. It preferentially binds to the DNA coil form likely via the formation of multiple labile hydrogen bonds with the donor-acceptor groups of DNA.
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Affiliation(s)
- Tatiana V Burova
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, 119991 Moscow, Russian Federation.
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