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Moses K, Van Tassel PR. Polyelectrolyte Influence on Beta-Hairpin Peptide Stability: A Simulation Study. J Phys Chem B 2023; 127:359-370. [PMID: 36574611 DOI: 10.1021/acs.jpcb.2c06641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Assemblies of proteins and charged macromolecules (polyelectrolytes) find important applications as pharmaceutical formulations, biocatalysts, and cell-contacting substrates. A key question is how the polymer component influences the structure and function of the protein. The present paper addresses the influence of charged polymers on the thermal stability of two model beta-hairpin-forming peptides through an all-atom, replica exchange molecular dynamics simulation. The (negatively charged) peptides consist of the terminal 16 amino acids of the B1 domain of Protein G (GB1) and a variant with three of the GB1 residues substituted with tryptophan (Tryptophan Zipper 4, or TZ4). A (cationic) lysine polymer is seen to thermally stabilize TZ4 and destabilize GB1, while a (also cationic) chitosan polymer slightly stabilizes GB1 but has essentially no effect on TZ4. Free energy profiles reveal folded and unfolded conformations to be separated by kinetic barriers generally acting in the direction of the thermodynamically favored state. Through application of an Ising-like statistical mechanical model, a mechanism is proposed based on competition between (indirect) entropic stabilization of folded versus unfolded states and (direct) competition for hydrogen-bonding and hydrophobic interactions. These findings have important implications to the design of polyelectrolyte-based materials for biomedical and biotechnological applications.
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Affiliation(s)
- Kevin Moses
- Dept. of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520-8286, United States
| | - Paul R Van Tassel
- Dept. of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520-8286, United States
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Wang LL, Yang C, Liu S. Development and antibacterial activity of zinc oxide nanoparticles encapsulated in core–shell microparticles for managing enterotoxigenic Escherichia coli-related post-weaning diarrhea. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-021-02303-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Sladek S, McCartney F, Eskander M, Dunne DJ, Santos-Martinez MJ, Benetti F, Tajber L, Brayden DJ. An Enteric-Coated Polyelectrolyte Nanocomplex Delivers Insulin in Rat Intestinal Instillations when Combined with a Permeation Enhancer. Pharmaceutics 2020; 12:pharmaceutics12030259. [PMID: 32178442 PMCID: PMC7151133 DOI: 10.3390/pharmaceutics12030259] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 03/03/2020] [Accepted: 03/10/2020] [Indexed: 12/16/2022] Open
Abstract
The use of nanocarriers is being researched to achieve oral peptide delivery. Insulin-associated anionic polyelectrolyte nanoparticle complexes (PECs) were formed that comprised hyaluronic acid and chitosan in an optimum mass mixing ratio of 5:1 (MR 5), followed by coating with a pH-dependent polymer. Free insulin was separated from PECs by size exclusion chromatography and then measured by HPLC. The association efficiency of insulin in PECs was >95% and the loading was ~83 µg/mg particles. Dynamic light scattering and nanoparticle tracking analysis of PECs revealed low polydispersity, a negative zeta potential range of −40 to −50 mV, and a diameter range of 95–200 nm. Dissolution studies in simulated small intestinal fluid (FaSSIF-V2) revealed that the PECs were colloidally stable. PECs that were coated with Eudragit® L-100 delayed insulin release in FaSSIF-V2 and protected insulin against pancreatin attack more than uncoated PECs. Uncoated anionic PECs interacted weakly with mucin in vitro and were non-cytotoxic to Caco-2 cells. The coated and uncoated PECs, both concentrated further by ultrafiltration, permitted dosing of 50 IU/kg in rat jejunal instillations, but they failed to reduce plasma glucose or deliver insulin to the blood. When ad-mixed with the permeation enhancer (PE), sucrose laurate (100 mM), the physicochemical parameters of coated PECs were relatively unchanged, however blood glucose was reduced by 70%. In conclusion, the use of a PE allowed for the PEC-released bioactive insulin to permeate the jejunum. This has implications for the design of orally delivered particles that can release the payload when formulated with enhancers.
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Affiliation(s)
- Svenja Sladek
- UCD School of Veterinary Medicine and UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland; (S.S.); (F.M.)
| | - Fiona McCartney
- UCD School of Veterinary Medicine and UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland; (S.S.); (F.M.)
| | - Mena Eskander
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin 2, Ireland; (M.E.); (D.J.D.); (M.J.S.-M.); (L.T.)
| | - David J. Dunne
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin 2, Ireland; (M.E.); (D.J.D.); (M.J.S.-M.); (L.T.)
| | - Maria Jose Santos-Martinez
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin 2, Ireland; (M.E.); (D.J.D.); (M.J.S.-M.); (L.T.)
- School of Medicine, Trinity College Dublin, Dublin 2, Ireland
| | - Federico Benetti
- ECSIN Laboratory–Ecamricert Srl, Corso Stati Uniti 4, I-35127 Padova, Italy;
| | - Lidia Tajber
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin 2, Ireland; (M.E.); (D.J.D.); (M.J.S.-M.); (L.T.)
| | - David J. Brayden
- UCD School of Veterinary Medicine and UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland; (S.S.); (F.M.)
- Correspondence: ; Tel.: +353-1716-6013
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Manconi M, Manca ML, Escribano-Ferrer E, Coma-Cros EM, Biosca A, Lantero E, Fernàndez-Busquets X, Fadda AM, Caddeo C. Nanoformulation of curcumin-loaded eudragit-nutriosomes to counteract malaria infection by a dual strategy: Improving antioxidant intestinal activity and systemic efficacy. Int J Pharm 2018; 556:82-88. [PMID: 30528634 DOI: 10.1016/j.ijpharm.2018.11.073] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 11/12/2018] [Accepted: 11/30/2018] [Indexed: 12/12/2022]
Abstract
In this paper, nutriosomes (phospholipid vesicles associated with Nutriose® FM06) were modified to obtain new systems aimed at enhancing the efficacy of curcumin in counteracting malaria infection upon oral administration. Eudragit® L100, a pH-sensitive co-polymer, was added to these vesicles, thus obtaining eudragit-nutriosomes, to improve their in vivo performances. Liposomes without eudragit and nutriose were also prepared as a reference. Cryo-TEM images showed the formation of multicompartment vesicles, with mean diameter around 300 nm and highly negative zeta potential. Vesicles were stable in fluids mimicking the gastro-intestinal content due to the high phospholipid concentration and the presence of gastro-resistant eudragit and digestion-resistant nutriose. Eudragit-nutriosomes disclosed promising performances in vitro and in vivo: they maximized the ability of curcumin to counteract oxidative stress in intestinal cells (Caco-2), which presumably reinforced its systemic efficacy. Orally-administered curcumin-loaded eudragit-nutriosomes increased significantly the survival of malaria-infected mice relative to free curcumin-treated controls.
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Affiliation(s)
- Maria Manconi
- Dept. of Scienze della Vita e dell'Ambiente, University of Cagliari, via Ospedale 72, 09124 Cagliari, Italy
| | - Maria Letizia Manca
- Dept. of Scienze della Vita e dell'Ambiente, University of Cagliari, via Ospedale 72, 09124 Cagliari, Italy.
| | - Elvira Escribano-Ferrer
- Biopharmaceutics and Pharmacokinetics Unit, Institute for Nanoscience and Nanotechnology, University of Barcelona, Barcelona, Spain
| | - Elisabet Martí Coma-Cros
- Nanomalaria Group, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, ES-08028 Barcelona, Spain; Barcelona Institute for Global Health (ISGlobal, Hospital Clínic-Universitat de Barcelona), Rosselló 149-153, ES-08036 Barcelona, Spain; Nanoscience and Nanotechnology Institute (IN2UB), University of Barcelona, Martí i Franquès 1, ES-08028 Barcelona, Spain
| | - Arnau Biosca
- Nanomalaria Group, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, ES-08028 Barcelona, Spain; Barcelona Institute for Global Health (ISGlobal, Hospital Clínic-Universitat de Barcelona), Rosselló 149-153, ES-08036 Barcelona, Spain; Nanoscience and Nanotechnology Institute (IN2UB), University of Barcelona, Martí i Franquès 1, ES-08028 Barcelona, Spain
| | - Elena Lantero
- Nanomalaria Group, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, ES-08028 Barcelona, Spain; Barcelona Institute for Global Health (ISGlobal, Hospital Clínic-Universitat de Barcelona), Rosselló 149-153, ES-08036 Barcelona, Spain; Nanoscience and Nanotechnology Institute (IN2UB), University of Barcelona, Martí i Franquès 1, ES-08028 Barcelona, Spain
| | - Xavier Fernàndez-Busquets
- Nanomalaria Group, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, ES-08028 Barcelona, Spain; Barcelona Institute for Global Health (ISGlobal, Hospital Clínic-Universitat de Barcelona), Rosselló 149-153, ES-08036 Barcelona, Spain; Nanoscience and Nanotechnology Institute (IN2UB), University of Barcelona, Martí i Franquès 1, ES-08028 Barcelona, Spain
| | - Anna Maria Fadda
- Dept. of Scienze della Vita e dell'Ambiente, University of Cagliari, via Ospedale 72, 09124 Cagliari, Italy
| | - Carla Caddeo
- Dept. of Scienze della Vita e dell'Ambiente, University of Cagliari, via Ospedale 72, 09124 Cagliari, Italy
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Liu T, Chen X, Xing J, Ge Z. Effects of acetazolamide on the conformations and activities of digestive enzymes: pepsin and trypsin. Med Chem Res 2018. [DOI: 10.1007/s00044-018-2172-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Momeni L, Shareghi B, Saboury AA, Farhadian S. The effect of spermine on the structure, thermal stability and activity of bovine pancreatic trypsin. RSC Adv 2016. [DOI: 10.1039/c6ra10549a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This work studied the interaction between spermine and trypsin at pH 8.0.
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Affiliation(s)
- Lida Momeni
- Department of Biology
- Faculty of Science
- University of Payam Noor
- Iran
- Department of Biology
| | - Behzad Shareghi
- Department of Biology
- Faculty of Science
- University of Shahrekord
- Shahrekord
- Iran
| | - Ali Akbar Saboury
- Institute of Biochemistry and Biophysics
- University of Tehran
- Tehran
- Iran
- Center of Excellence in Biothermodynamics
| | - Sadegh Farhadian
- Department of Biology
- Faculty of Science
- University of Shahrekord
- Shahrekord
- Iran
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