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Perera RM, Gupta S, Li T, Bleuel M, Hong K, Schneider GJ. Influence of NaCl on shape deformation of polymersomes. SOFT MATTER 2021; 17:4452-4463. [PMID: 33908443 DOI: 10.1039/d0sm02271c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Polymersomes frequently appear in the literature as promising candidates for a wide range of applications from targeted drug delivery to nanoreactors. From a cell mimetic point of view, it is important to understand the size and shape changes of the vesicles in the physiological environment since that can influence the drug delivery mechanism. In this work we studied the structural features of polymersomes consisting of poly(ethylene glycol)-poly(dimethylsiloxane)-poly(ethylene glycol) at the nanoscopic length scale in the presence of NaCl, which is a very common molecule in the biotic aqueous environment. We used dynamic light scattering (DLS), cryo-TEM, small angle neutron scattering (SANS) and small angle X-ray scattering (SAXS). We observed transformation of polymersomes from spherical to elongated vesicles at low salt concentration and into multivesicular structures at high salt concentration. Model fitting analysis of SANS data indicated a reduction of vesicle radius up to 47% and from the SAXS data we observed an increase in membrane thickness up to 8% and an increase of the PDMS hydrophobic segment up to 11% indicating stretching of the membrane due to osmotic imbalance. Also, from the increase in the interlamellar repeat distance up to 98% under high salt concentrations, we concluded that the shape and structural changes observed in the polymersomes are a combined result of osmotic pressure change and ion-membrane interactions.
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Affiliation(s)
- Rasangi M Perera
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Sudipta Gupta
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Tianyu Li
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Markus Bleuel
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-8562, USA and Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742-2115, USA
| | - Kunlun Hong
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Gerald J Schneider
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA. and Department of Physics & Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA.
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2
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Exploiting the photoactivity of bacterial reaction center to investigate liposome dynamics. Photochem Photobiol Sci 2021; 20:321-326. [PMID: 33721250 DOI: 10.1007/s43630-021-00011-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 01/08/2021] [Indexed: 10/22/2022]
Abstract
Charge recombination kinetics of bacterial photosynthetic protein Reaction Center displays an exquisite sensitivity to the actual occupancy of ubiquinone-10 in its QB-binding site. Here, we have exploited such phenomenon for assessing the growth and the aggregation/fusion of phosphocholine vesicles embedding RC in their membrane, when treated with sodium oleate.
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3
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Design and modelling of a photo-electrochemical transduction system based on solubilized photosynthetic reaction centres. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.09.198] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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4
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Sanborn JR, Chen X, Yao YC, Hammons JA, Tunuguntla RH, Zhang Y, Newcomb CC, Soltis JA, De Yoreo JJ, Van Buuren A, Parikh AN, Noy A. Carbon Nanotube Porins in Amphiphilic Block Copolymers as Fully Synthetic Mimics of Biological Membranes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1803355. [PMID: 30368926 DOI: 10.1002/adma.201803355] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Revised: 08/28/2018] [Indexed: 06/08/2023]
Abstract
Biological membranes provide a fascinating example of a separation system that is multifunctional, tunable, precise, and efficient. Biomimetic membranes, which mimic the architecture of cellular membranes, have the potential to deliver significant improvements in specificity and permeability. Here, a fully synthetic biomimetic membrane is reported that incorporates ultra-efficient 1.5 nm diameter carbon nanotube porin (CNTPs) channels in a block-copolymer matrix. It is demonstrated that CNTPs maintain high proton and water permeability in these membranes. CNTPs can also mimic the behavior of biological gap junctions by forming bridges between vesicular compartments that allow transport of small molecules.
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Affiliation(s)
- Jeremy R Sanborn
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- University of California Davis, Davis, CA, 95616, USA
| | - Xi Chen
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA, 95343, USA
| | - Yun-Chiao Yao
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA, 95343, USA
| | - Joshua A Hammons
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Ramya H Tunuguntla
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Yuliang Zhang
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Christina C Newcomb
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Jennifer A Soltis
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - James J De Yoreo
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
- Department of Materials Science and Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195, USA
| | - Anthony Van Buuren
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Atul N Parikh
- University of California Davis, Davis, CA, 95616, USA
| | - Aleksandr Noy
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA, 95343, USA
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5
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De Leo V, Milano F, Mancini E, Comparelli R, Giotta L, Nacci A, Longobardi F, Garbetta A, Agostiano A, Catucci L. Encapsulation of Curcumin-Loaded Liposomes for Colonic Drug Delivery in a pH-Responsive Polymer Cluster Using a pH-Driven and Organic Solvent-Free Process. Molecules 2018; 23:E739. [PMID: 29570636 PMCID: PMC6017095 DOI: 10.3390/molecules23040739] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 03/09/2018] [Accepted: 03/21/2018] [Indexed: 01/08/2023] Open
Abstract
The present study aimed to develop and optimize liposome formulation for the colonic delivery of biologically active compounds. A strategy to facilitate such targeting is to formulate liposomes with a polymer coating sensitive to the pH shifts in the gastrointestinal tract. To this end, liposomes encapsulating curcumin-chosen as the biologically active compound model-and coated with the pH-responsive polymer Eudragit S100 were prepared and characterized. Curcumin was encapsulated into small unilamellar vesicles (SUVs) by the micelle-to-vesicle transition method (MVT) in a simple and organic solvent-free way. Curcumin-loaded liposomes were coated with Eudragit S100 by a fast and easily scalable pH-driven method. The prepared liposomes were evaluated for size, surface morphology, entrapment efficiency, stability, in vitro drug release, and curcumin antioxidant activity. In particular, curcumin-loaded liposomes displayed size lower than 100 nm, encapsulation efficiency of 98%, high stability at both 4 °C and 25 °C, high in vitro antioxidant activity, and a cumulative release that was completed within 200 min. A good Eudragit S100 coating which did not alter the properties of the curcumin-loaded liposomes was obtained. The present work therefore provides a fast and solvent-free method to prepare pH-responsive polymer-coated liposomes for the colonic delivery of biologically active compounds.
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Affiliation(s)
- Vincenzo De Leo
- Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy.
- CNR-IPCF Institute for Physical and Chemical Processes, Bari unit, Via Orabona 4, 70126 Bari, Italy.
| | - Francesco Milano
- CNR-IPCF Institute for Physical and Chemical Processes, Bari unit, Via Orabona 4, 70126 Bari, Italy.
| | - Erminia Mancini
- Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy.
| | - Roberto Comparelli
- CNR-IPCF Institute for Physical and Chemical Processes, Bari unit, Via Orabona 4, 70126 Bari, Italy.
| | - Livia Giotta
- Department of Biological and Environmental Sciences and Technologies, University of Salento, SP Lecce-Monteroni, I-73100 Lecce, Italy.
| | - Angelo Nacci
- Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy.
- CNR-ICCOM Institute of chemistry of organometallic compounds, Bari unit, Via E. Orabona, 4, 70126 Bari, Italy.
| | | | - Antonella Garbetta
- CNR-ISPA Institute of Sciences of Food Production, Via G. Amendola 122/O, 70125 Bari, Italy.
| | - Angela Agostiano
- Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy.
- CNR-IPCF Institute for Physical and Chemical Processes, Bari unit, Via Orabona 4, 70126 Bari, Italy.
| | - Lucia Catucci
- Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy.
- CNR-IPCF Institute for Physical and Chemical Processes, Bari unit, Via Orabona 4, 70126 Bari, Italy.
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6
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De Leo V, Catucci L, Di Mauro AE, Agostiano A, Giotta L, Trotta M, Milano F. Effect of ultrasound on the function and structure of a membrane protein: The case study of photosynthetic Reaction Center from Rhodobacter sphaeroides. ULTRASONICS SONOCHEMISTRY 2017; 35:103-111. [PMID: 27639525 DOI: 10.1016/j.ultsonch.2016.09.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 09/05/2016] [Accepted: 09/06/2016] [Indexed: 06/06/2023]
Abstract
Ultrasounds are used in many industrial, medical and research applications. Properties and function of proteins are strongly influenced by the interaction with the ultrasonic waves and their bioactivity can be lost because of alteration of protein structure. Surprisingly, to the best of our knowledge no study was carried out on Integral Membrane Proteins (IMPs), which are responsible for a variety of fundamental biological functions. In this work, the photosynthetic Reaction Center (RC) of the bacterium Rhodobacter sphaeroides has been used as a model for the study of the ultrasound-induced IMP denaturation. Purified RCs were suspended in i) detergent micelles, in ii) detergent-free buffer and iii) reconstituted in liposomes, and then treated with ultrasound at 30W and 20kHz at increasing times. The optical absorption spectra showed a progressive and irreversible denaturation in all cases, resulting from the perturbation of the protein scaffold structure, as confirmed by circular dichroism spectra that showed progressive alterations of the RC secondary structure. Charge recombination kinetics were studied to assess the protein photoactivity. The lifetime for the loss of RC photoactivity was 32min in detergent micelles, ranged from 3.8 to 6.5min in the different proteoliposomes formulations, and 5.5min in detergent-free buffer. Atomic force microscopy revealed the formation of large RC aggregates related to the sonication-induced denaturation, in agreement with the scattering increase observed in solution.
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Affiliation(s)
- Vincenzo De Leo
- Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy; CNR-IPCF Institute for Physical and Chemical Processes, Bari Unit, Via Orabona 4, 70126 Bari, Italy.
| | - Lucia Catucci
- Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy; CNR-IPCF Institute for Physical and Chemical Processes, Bari Unit, Via Orabona 4, 70126 Bari, Italy
| | - A Evelyn Di Mauro
- CNR-IPCF Institute for Physical and Chemical Processes, Bari Unit, Via Orabona 4, 70126 Bari, Italy
| | - Angela Agostiano
- Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy; CNR-IPCF Institute for Physical and Chemical Processes, Bari Unit, Via Orabona 4, 70126 Bari, Italy
| | - Livia Giotta
- Department of Biological and Environmental Sciences and Technologies, University of Salento, SP Lecce-Monteroni, 73100 Lecce, Italy
| | - Massimo Trotta
- CNR-IPCF Institute for Physical and Chemical Processes, Bari Unit, Via Orabona 4, 70126 Bari, Italy
| | - Francesco Milano
- CNR-IPCF Institute for Physical and Chemical Processes, Bari Unit, Via Orabona 4, 70126 Bari, Italy
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7
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Hassan Omar O, la Gatta S, Tangorra RR, Milano F, Ragni R, Operamolla A, Argazzi R, Chiorboli C, Agostiano A, Trotta M, Farinola GM. Synthetic Antenna Functioning As Light Harvester in the Whole Visible Region for Enhanced Hybrid Photosynthetic Reaction Centers. Bioconjug Chem 2016; 27:1614-23. [DOI: 10.1021/acs.bioconjchem.6b00175] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
| | - Simona la Gatta
- Dipartimento
di Chimica, Università degli Studi di Bari “Aldo Moro”, 70125 Bari, Italy
| | | | | | - Roberta Ragni
- Dipartimento
di Chimica, Università degli Studi di Bari “Aldo Moro”, 70125 Bari, Italy
| | - Alessandra Operamolla
- Dipartimento
di Chimica, Università degli Studi di Bari “Aldo Moro”, 70125 Bari, Italy
| | - Roberto Argazzi
- Istituto
di Sintesi Organica e Fotoreattività, Consiglio Nazionale delle Ricerche, 44121 Ferrara, Italy
| | - Claudio Chiorboli
- Istituto
di Sintesi Organica e Fotoreattività, Consiglio Nazionale delle Ricerche, 44121 Ferrara, Italy
| | - Angela Agostiano
- Dipartimento
di Chimica, Università degli Studi di Bari “Aldo Moro”, 70125 Bari, Italy
| | | | - Gianluca M. Farinola
- Dipartimento
di Chimica, Università degli Studi di Bari “Aldo Moro”, 70125 Bari, Italy
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