1
|
Tian Y, Wang H, Xu G, Tu Y, Zhang Y, Zhang W, Liang Y, Li A, Xie X, Peng Z, Wang Y, Xie X. Novel covalently bound organic silicon-ferrum hybrid coagulant with excellent coagulation performance and bacteriostatic ability. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
|
2
|
Dubrovin EV, Barinov NA, Ivanov DA, Klinov DV. Single-molecule AFM study of hyaluronic acid softening in electrolyte solutions. Carbohydr Polym 2023; 303:120472. [PMID: 36657830 DOI: 10.1016/j.carbpol.2022.120472] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 11/30/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022]
Abstract
Investigation of hyaluronic acid (HA) morphology and mechanical properties at a single-molecule level is important for the development of HA based biomaterials. We have developed the atomic force microscopy (AFM) based approach for quantitative characterization of conformation of HA molecules. HA molecules adsorbed on a modified graphitic surface form oriented linear segments. Conformation of HA molecules can be considered as two-dimensional quasi-projection of a three-dimensional conformation locally straightened by a substrate. The persistence length and Young's modulus of biomolecules estimated using wormlike chain model decrease from 15.7 to 9.9 nm, and from ∼21 to ∼13 GPa, respectively, when KCl concentration increases from 0 to 100 mM. The dependence of the persistence length on ionic strength supports the Odijk-Skolnick-Fixman model of polyelectrolyte stiffening in electrolyte solution. The obtained results represent a new insight into the conformation and mechanical characteristics of HA molecules and complement the characterization of this biopolymer by bulk methods.
Collapse
Affiliation(s)
- Evgeniy V Dubrovin
- Sirius University of Science and Technology, 1 Olympic Ave, 354340 Sochi, Russian Federation; Moscow Institute of Physics and Technology, Institutskiy Per. 9, Dolgoprudny 141700, Russian Federation; Lomonosov Moscow State University, Leninskie Gory 1 bld. 2, 119991 Moscow, Russian Federation.
| | - Nikolay A Barinov
- Sirius University of Science and Technology, 1 Olympic Ave, 354340 Sochi, Russian Federation; Moscow Institute of Physics and Technology, Institutskiy Per. 9, Dolgoprudny 141700, Russian Federation.
| | - Dmitry A Ivanov
- Sirius University of Science and Technology, 1 Olympic Ave, 354340 Sochi, Russian Federation; Institut de Sciences des Matériaux de Mulhouse - IS2M, CNRS UMR7361, 15 Jean Starcky, Mulhouse 68057, France.
| | - Dmitry V Klinov
- Sirius University of Science and Technology, 1 Olympic Ave, 354340 Sochi, Russian Federation; Moscow Institute of Physics and Technology, Institutskiy Per. 9, Dolgoprudny 141700, Russian Federation.
| |
Collapse
|
3
|
Screening of the Chemical Composition and Identification of Hyaluronic Acid in Food Supplements by Fractionation and Fourier-Transform Infrared Spectroscopy. Polymers (Basel) 2021; 13:polym13224002. [PMID: 34833306 PMCID: PMC8620353 DOI: 10.3390/polym13224002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 11/07/2021] [Accepted: 11/16/2021] [Indexed: 01/19/2023] Open
Abstract
Hyaluronic acid, together with collagen, vitamins or plant extracts, is a part of many cosmetic and food preparations. For example, this polysaccharide is used in formulation of many food supplements due to its protective effects on human health. In this work, the screening of the chemical composition of three chosen dietary supplements (powder, tablets and capsules) containing hyaluronic acid was carried out using Fourier-transform infrared spectroscopy. Because of the low amount of analyte in all these samples, it was isolated or concentrated prior to the analysis using a suitable sequential fractionation protocol. Individual isolation procedures were established for each sample based on their declared composition. Firstly, the major components such as collagen or vitamins were removed to obtain polysaccharide fractions by the enzymatic treatment and/or washing out with the appropriate solvents. In some cases, the water insoluble part was removed from the rest dissolved in water. Then, hyaluronic acid was precipitated with copper(II) cations and thus separated from the other polysaccharides. Finally, the analyte was identified in the enriched fractions by the characteristic vibrational bands. The amount of hyaluronic acid in the purified fractions was determined in three ways: gravimetrically, spectrophotometrically, and using isotachophoresis. The combination of the appropriate preparative and analytical steps led to the successful evaluation of chemical composition, finding and quantification of hyaluronic acid in all the studied samples.
Collapse
|
4
|
Rasool A, Rizwan M, Islam A, Abdullah H, Shafqat SS, Azeem MK, Rasheed T, Bilal M. Chitosan‐Based Smart Polymeric Hydrogels and Their Prospective Applications in Biomedicine. STARCH-STARKE 2021. [DOI: 10.1002/star.202100150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Atta Rasool
- School of Chemistry University of the Punjab Lahore Punjab 54000 Pakistan
| | - Muhammad Rizwan
- Department of Chemistry The University of Lahore Lahore 54000 Pakistan
| | - Atif Islam
- Institute of Polymer and Textile Engineering University of the Punjab Lahore 54000 Pakistan
| | - Huda Abdullah
- Electrical and Electronic Engineering Programme Faculty of Engineering & Built Environment Universiti Kebangsaan Malaysia Selangor 43600 Malaysia
| | | | - Muhammad Khalid Azeem
- Institute of Polymer and Textile Engineering University of the Punjab Lahore 54000 Pakistan
| | - Tahir Rasheed
- Interdisciplinary Research Center for Advanced Materials King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia
| | - Muhammad Bilal
- School of Life Science and Food Engineering Huaiyin Institute of Technology Huaian 223003 China
| |
Collapse
|
5
|
Factors determining self-assembly of hyaluronan. Carbohydr Polym 2021; 254:117307. [DOI: 10.1016/j.carbpol.2020.117307] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 09/25/2020] [Accepted: 10/20/2020] [Indexed: 12/21/2022]
|
6
|
Gao Y, Sarode A, Kokoroskos N, Ukidve A, Zhao Z, Guo S, Flaumenhaft R, Gupta AS, Saillant N, Mitragotri S. A polymer-based systemic hemostatic agent. SCIENCE ADVANCES 2020; 6:eaba0588. [PMID: 32775633 PMCID: PMC7394519 DOI: 10.1126/sciadv.aba0588] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 06/18/2020] [Indexed: 05/21/2023]
Abstract
Uncontrolled noncompressible hemorrhage is a major cause of mortality following traumatic injuries in civilian and military populations. An injectable hemostat for point-of-care treatment of noncompressible hemorrhage represents an urgent medical need. Here, we describe an injectable hemostatic agent via polymer peptide interfusion (HAPPI), a hyaluronic acid conjugate with a collagen-binding peptide and a von Willebrand factor-binding peptide. HAPPI exhibited selective binding to activated platelets and promoted their accumulation at the wound site in vitro. In vivo studies in mouse tail vein laceration model demonstrated a reduction of >97% in both bleeding time and blood loss. A 284% improvement in the survival time was observed in the rat inferior vena cava traumatic model. Lyophilized HAPPI could be stably stored at room temperature for several months and reconstituted during therapeutic intervention. HAPPI provides a potentially clinically translatable intravenous hemostat.
Collapse
Affiliation(s)
- Yongsheng Gao
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Apoorva Sarode
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Nikolaos Kokoroskos
- Division of Trauma, Emergency Surgery, and Surgical Critical Care, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Anvay Ukidve
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Zongmin Zhao
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Shihui Guo
- Division of Hemostasis and Thrombosis, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Robert Flaumenhaft
- Division of Hemostasis and Thrombosis, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Anirban Sen Gupta
- Department of Biomedical Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USA
| | - Noelle Saillant
- Division of Trauma, Emergency Surgery, and Surgical Critical Care, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Samir Mitragotri
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA
| |
Collapse
|
7
|
Kulaberoglu Y, Bhushan B, Hadi F, Chakrabarti S, Khaled WT, Rankin KS, Smith ESJ, Frankel D. The material properties of naked mole-rat hyaluronan. Sci Rep 2019; 9:6632. [PMID: 31036852 PMCID: PMC6488695 DOI: 10.1038/s41598-019-43194-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 04/16/2019] [Indexed: 11/09/2022] Open
Abstract
Hyaluronan (HA) is a key component of the extracellular matrix. Given the fundamental role of HA in the cancer resistance of the naked mole-rat (NMR), we undertook to explore the structural and soft matter properties of this species-specific variant, a necessary step for its development as a biomaterial. We examined HA extracted from NMR brain, lung, and skin, as well as that isolated from the medium of immortalised cells. In common with mouse HA, NMR HA forms a range of assemblies corresponding to a wide distribution of molecular weights. However, unique to the NMR, are highly folded structures, whose characteristic morphology is dependent on the tissue type. Skin HA forms tightly packed assemblies that have spring-like mechanical properties in addition to a strong affinity for water. Brain HA forms three dimensional folded structures similar to the macroscopic appearance of the gyri and sulci of the human brain. Lung HA forms an impenetrable mesh of interwoven folds in a morphology that can only be described as resembling a snowman. Unlike HA that is commercially available, NMR HA readily forms robust gels without the need for chemical cross-linking. NMR HA gels sharply transition from viscoelastic to elastic like properties upon dehydration or repeated loading. In addition, NMR HA can form ordered thin films with an underlying semi-crystalline structure. Given the role of HA in maintaining hydration in the skin it is plausible that the folded structures contribute to both the elasticity and youthfulness of NMR skin. It is also possible that such densely folded materials could present a considerable barrier to cell invasion throughout the tissues, a useful characteristic for a biomaterial.
Collapse
Affiliation(s)
- Yavuz Kulaberoglu
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
| | - Bharat Bhushan
- School of Engineering, Newcastle University, Merz Court, Newcastle upon Tyne, NE1 7RU, UK
| | - Fazal Hadi
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
| | - Sampurna Chakrabarti
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
| | - Walid T Khaled
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
| | - Kenneth S Rankin
- Northern Institute for Cancer Research, Medical School, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK.
| | - Ewan St John Smith
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK.
| | - Daniel Frankel
- School of Engineering, Newcastle University, Merz Court, Newcastle upon Tyne, NE1 7RU, UK.
| |
Collapse
|
8
|
Rasool A, Ata S, Islam A, Khan RU. Fabrication of novel carrageenan based stimuli responsive injectable hydrogels for controlled release of cephradine. RSC Adv 2019; 9:12282-12290. [PMID: 35515844 PMCID: PMC9063494 DOI: 10.1039/c9ra02130b] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 04/08/2019] [Indexed: 11/21/2022] Open
Abstract
Kappa carrageenan was used to prepare hydrogels having novel compositions with poly(vinyl alcohol) (PVA) and a crosslinker (3-aminopropyl)triethoxysilane (APTES). FTIR was used to confirm the structure and composition of hydrogels. The swelling behavior of hydrogels was studied under different conditions of pH and electrolytic aqueous media. The most efficient swelling result (200%) was observed by the sample containing a low fraction of crosslinker. It also showed different swelling responses in different pH solutions that made it suitable for drug delivery. Thermogravimetric analysis (TGA) illustrated that with the increase in crosslinker amount, the stability of hydrogel was increased. The biodegradation analysis of the hydrogels exhibited the break down by various enzymes into small chain polysaccharides that further broke down in the metabolic pathways. It was revealed that all the hydrogel samples showed strong antibacterial activity against S. aureus and a little against E. coli. Cephradine was used as a model drug and its in vitro release was studied in simulated intestinal fluids (SIF). This release account of the cephradine demonstrated that the release of the drug increased as the time and pH increased, reaching its maximum amount of 85.5% after 7.5 h.
Collapse
Affiliation(s)
- Atta Rasool
- Institute of Chemistry, University of the Punjab P. O. Box, 54590 Lahore Pakistan +92-300-9477-89
- Department of Polymer Engineering and Technology, University of the Punjab P. O. Box, 54590 Lahore Pakistan +92-300-6686-506
| | - Sadia Ata
- Institute of Chemistry, University of the Punjab P. O. Box, 54590 Lahore Pakistan +92-300-9477-89
| | - Atif Islam
- Department of Polymer Engineering and Technology, University of the Punjab P. O. Box, 54590 Lahore Pakistan +92-300-6686-506
| | - Rafi Ullah Khan
- Department of Polymer Engineering and Technology, University of the Punjab P. O. Box, 54590 Lahore Pakistan +92-300-6686-506
| |
Collapse
|
9
|
Abstract
The study of biological samples is one of the most attractive and innovative fields of application of atomic force microscopy AFM. Recent breakthroughs in software and hardware have revolutionized this field and this paper reports on recent trends and describes examples of applications on biological samples. Originally developed for high-resolution imaging purposes, the AFM also has unique capabilities as a nano-indentor to probe the dynamic visco-elastic material properties of living cells in culture. In particular, AFM elastography combines imaging and indentation modalities to map the spatial distribution of cell mechanical properties, which in turn reflect the structure and function of the underlying structure. This paper describes the progress and development of atomic force microscopy as applied to animal and plant cell structures.
Collapse
|
10
|
Abstract
The glycosaminoglycan hyaluronan (HA) is a key component of the microenvironment surrounding cells. In healthy tissues, HA molecules have extremely high molecular mass and consequently large hydrodynamic volumes. Tethered to the cell surface by clustered receptor proteins, HA molecules crowd each other, as well as other macromolecular species. This leads to severe nonideality in physical properties of the biomatrix, because steric exclusion leads to an increase in effective concentration of the macromolecules. The excluded volume depends on both polymer concentration and hydrodynamic volume/molecular mass. The biomechanical properties of the extracellular matrix, tissue hydration, receptor clustering, and receptor-ligand interactions are strongly affected by the presence of HA and by its molecular mass. In inflammation, reactive oxygen and nitrogen species fragment the HA chains. Depending on the rate of chain degradation relative to the rates of new synthesis and removal of damaged chains, short fragments of the HA molecules can be present at significant levels. Not only are the physical properties of the extracellular matrix affected, but the HA fragments decluster their primary receptors and act as endogenous danger signals. Bioanalytical methods to isolate and quantify HA fragments have been developed to determine profiles of HA content and size in healthy and diseased biological fluids and tissues. These methods have potential use in medical diagnostic tests. Therapeutic agents that modulate signaling by HA fragments show promise in wound healing and tissue repair without fibrosis.
Collapse
Affiliation(s)
- Mary K Cowman
- Tandon School of Engineering, New York University, New York, NY, United States
| |
Collapse
|
11
|
Michalicová P, Mravec F, Pekař M. Fluorescence study of freeze-drying as a method for support the interactions between hyaluronan and hydrophobic species. PLoS One 2017; 12:e0184558. [PMID: 28886150 PMCID: PMC5590968 DOI: 10.1371/journal.pone.0184558] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 08/25/2017] [Indexed: 11/18/2022] Open
Abstract
A freeze-drying method enabling solubilization of hydrophobic species in aqueous solutions of native hyaluronan is described. The method is based on opening the access to supposed hydrophobic patches on hyaluronan by disturbing its massive hydration shell. Hydrophobic and/or polarity-sensitive fluorescence probes were used as hydrophobic models or indicators of interactions with hydrophobic patches. Fluorescence parameters specific to individual probes confirmed the efficiency of the freeze-drying method. This work is the first step in developing biocompatible and biodegradable carriers for hydrophobic drugs with targeted distribution of the active compound from native, chemically non-modified hyaluronan.
Collapse
Affiliation(s)
- Petra Michalicová
- Brno University of Technology, Faculty of Chemistry, Institute of Physical and Applied Chemistry and Materials Research Centre, Brno, Czech Republic
| | - Filip Mravec
- Brno University of Technology, Faculty of Chemistry, Institute of Physical and Applied Chemistry and Materials Research Centre, Brno, Czech Republic
| | - Miloslav Pekař
- Brno University of Technology, Faculty of Chemistry, Institute of Physical and Applied Chemistry and Materials Research Centre, Brno, Czech Republic
- * E-mail:
| |
Collapse
|
12
|
Rankin KS, Frankel D. Hyaluronan in cancer - from the naked mole rat to nanoparticle therapy. SOFT MATTER 2016; 12:3841-8. [PMID: 27079782 DOI: 10.1039/c6sm00513f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Hyaluronan, a glycosaminoglycan, abundant in the tumour microenvironment, is a key player in many processes associated with cancer. Recently the cancer resistance of the naked mole rat has been attributed to the presence of an ultra-high molecular weight form of this molecule. The physical properties of this multifunctional biopolymer have been extensively studied in the context of synovial joints. However, relatively little has been reported with regard to the soft matter properties of hyaluronan in relation to cancer. In this review we examine the role of hyaluronan in cancer, paying particular attention to its mechanical interactions with malignant cells and its soft matter properties. In addition we discuss the use of hyaluronan based gels to study cancer invasion as well as nanoparticle based strategies for disease treatment.
Collapse
Affiliation(s)
- Kenneth S Rankin
- Northern Institute for Cancer Research, Medical School, Newcastle University, Paul O'Gorman Building, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK
| | | |
Collapse
|
13
|
Gómez-Mascaraque LG, Méndez JA, Fernández-Gutiérrez M, Vázquez B, San Román J. Oxidized dextrins as alternative crosslinking agents for polysaccharides: application to hydrogels of agarose-chitosan. Acta Biomater 2014; 10:798-811. [PMID: 24121253 DOI: 10.1016/j.actbio.2013.10.003] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 08/27/2013] [Accepted: 10/03/2013] [Indexed: 12/28/2022]
Abstract
Hydrogel networks that combine suitable physical and biomechanical characteristics for tissue engineering scaffolds are in demand. The aim of this work was the development of hydrogel networks based on agarose and chitosan using oxidized dextrins as low cytotoxicity crosslinking agents, paying special attention to the study of the influence of the polysaccharide composition and oxidation degree of the dextrins in the final characteristics of the network. The results show that the formation of an interpenetrating or a semi-interpenetrating polymer network was mainly dependent on a minimum agarose content and degree of oxidation of dextrin. Spectroscopic, thermal and swelling analysis revealed good compatibility with an absence of phase separation of polysaccharides at agarose:chitosan proportions of 50:50 and 25:75. The analysis of atomic force microscopy images showed the formation of a fibrillar microstructure whose distribution within the crosslinked chitosan depended mainly on the crosslinker. All materials exhibited the viscoelastic behaviour typical of gels, with a constant storage modulus independent of frequency for all compositions. The stiffness was strongly influenced by the degree of oxidation of the crosslinker. Cellular response to the hydrogels was studied with cells of different strains, and cell adhesion and proliferation was correlated with the homogeneity of the samples and their elastic properties. Some hydrogel formulations seemed to be candidates for tissue engineering applications such as wound healing or soft tissue regeneration.
Collapse
Affiliation(s)
- Laura G Gómez-Mascaraque
- CIBER-BBN, Ebro River Campus, R&D Building, Block 5, Floor 1, Poeta Mariano Esquillor s/n, 50017 Zaragoza, Spain; Institute of Polymer Science and Technology, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - José Alberto Méndez
- Escola Politècnica Superior, Edifici PI, Campus Montilivi, University of Girona, 17071 Girona, Spain
| | - Mar Fernández-Gutiérrez
- CIBER-BBN, Ebro River Campus, R&D Building, Block 5, Floor 1, Poeta Mariano Esquillor s/n, 50017 Zaragoza, Spain; Institute of Polymer Science and Technology, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Blanca Vázquez
- CIBER-BBN, Ebro River Campus, R&D Building, Block 5, Floor 1, Poeta Mariano Esquillor s/n, 50017 Zaragoza, Spain; Institute of Polymer Science and Technology, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain.
| | - Julio San Román
- CIBER-BBN, Ebro River Campus, R&D Building, Block 5, Floor 1, Poeta Mariano Esquillor s/n, 50017 Zaragoza, Spain; Institute of Polymer Science and Technology, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| |
Collapse
|
14
|
Chung EJ, Jakus AE, Shah RN. In situ forming collagen-hyaluronic acid membrane structures: mechanism of self-assembly and applications in regenerative medicine. Acta Biomater 2013; 9:5153-61. [PMID: 23022546 DOI: 10.1016/j.actbio.2012.09.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2012] [Revised: 09/14/2012] [Accepted: 09/18/2012] [Indexed: 11/18/2022]
Abstract
Bioactive, in situ forming materials have the potential to complement minimally invasive surgical procedures and enhance tissue healing. For such biomaterials to be adopted in the clinic, they must be cost-effective, easily handled by the surgeon and have a history of biocompatibility. To this end, we report a novel and facile self-assembling strategy to create membranes and encapsulating structures using collagen and hyaluronic acid (HA). Unlike membranes built by layer-by-layer deposition of oppositely charged biomolecules, the collagen-HA membranes described here form a diffusion barrier upon electrostatic interaction of the oppositely charged biomolecules, which is further driven by osmotic pressure imbalances. The resulting membranes have a nanofibrous architecture, a thicknesses of 130 μm and a tensile modulus (0.59±0.06 MPa) that can increase 7-fold using carbodiimide chemistry (4.42±1.46 MPa). Collagen-HA membranes support mesenchymal stem cell proliferation and have a slow and steady protein release profile (7% at day 28), offering opportunities for targeted tissue regeneration. We demonstrate the capacity to encapsulate cells by injecting HA into the collagen solution, and enhance allograft and implant biocompatibility through a coating technique. This study describes a novel mechanism of collagen-HA membrane formation and provides the groundwork to apply these membranes in a variety of tissue engineering applications.
Collapse
Affiliation(s)
- Eun Ji Chung
- Institute for BioNantechnology in Medicine, Northwestern University, Chicago, IL 60611, USA
| | | | | |
Collapse
|
15
|
Nevius BA, Chen YP, Ferry JL, Decho AW. Surface-functionalization effects on uptake of fluorescent polystyrene nanoparticles by model biofilms. ECOTOXICOLOGY (LONDON, ENGLAND) 2012; 21:2205-2213. [PMID: 22806556 DOI: 10.1007/s10646-012-0975-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/04/2012] [Indexed: 06/01/2023]
Abstract
A study was conducted to investigate the role of nanoparticle (NP) surface functionalization/charge on their uptake by biofilms. Biofilms, bacterial colonies attached to surfaces via extracellular polymers, are effective at removing suspended nanomaterials from the aqueous phase. However, the mechanisms regulating particle uptake are unknown. Here, it was shown that the mechanism was strongly dependent on the nanoparticle surface ionization, and not the core composition of the NP. Uptake experiments were conducted using laboratory-cultured biofilms. The biofilms were incubated in the presence of fluorescent polystyrene NPs with either negatively-charged surfaces (i.e. functionalized with sulfated (SO(4) (-)-NP) or carboxylated (COO(-)-NP) groups) or positively-charged surfaces (functionalized with primary amines, Amine-P). Particles with negatively-charged sulfated surfaces associated most strongly to biofilms across all experimental conditions. Associations of positively-charged amine particles with biofilms were greatest at high ionic conditions resembling those of seawater, but were sensitive to changes in ionic strength. Sorption of COO(-)-NPs was lowest, relative to other particle types, and was not sensitive to ionic strength. The results of this study support an emerging precedent that biofilms may be an effective player in the binding and sequestration of nanoparticles in aqueous systems.
Collapse
Affiliation(s)
- Brian A Nevius
- Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA
| | | | | | | |
Collapse
|
16
|
Lyubchenko YL, Shlyakhtenko LS, Ando T. Imaging of nucleic acids with atomic force microscopy. Methods 2011; 54:274-83. [PMID: 21310240 PMCID: PMC3114274 DOI: 10.1016/j.ymeth.2011.02.001] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2010] [Revised: 12/07/2010] [Accepted: 02/01/2011] [Indexed: 11/18/2022] Open
Abstract
Atomic force microscopy (AFM) is a key tool of nanotechnology with great importance in applications to DNA nanotechnology and to the recently emerging field of RNA nanotechnology. Advances in the methodology of AFM now enable reliable and reproducible imaging of DNA of various structures, topologies, and DNA and RNA nanostructures. These advances are reviewed here with emphasis on methods utilizing modification of mica to prepare the surfaces enabling reliable and reproducible imaging of DNA and RNA nanostructures. Since the AFM technology for DNA is more mature, AFM imaging of DNA is introduced in this review to provide experience and background for the improvement of AFM imaging of RNA. Examples of imaging different structures of RNA and DNA are discussed and illustrated. Special attention is given to the potential use of AFM to image the dynamics of nucleic acids at the nanometer scale. As such, we review recent advances with the use of time-lapse AFM.
Collapse
Affiliation(s)
- Yuri L Lyubchenko
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE 68198-6025, USA.
| | | | | |
Collapse
|
17
|
Khokhlova MA, Chaschin IS, Grigorev TE, Gallyamov MO. Chitosan Macromolecules on a Substrate: Deposition from Solutions in sc CO2
and Reorganisation in Vapours. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/masy.201051070] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
18
|
Matteini P, Dei L, Carretti E, Volpi N, Goti A, Pini R. Structural behavior of highly concentrated hyaluronan. Biomacromolecules 2009; 10:1516-22. [PMID: 19358524 DOI: 10.1021/bm900108z] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
When investigated under high concentration conditions, hyaluronan (HA) solutions in physiological saline are shown to generate stable superstructures. An abrupt change in the rheological properties observed on increasing the temperature suggests the breaking of certain cooperative bonds. The thermal disruption of the HA superstructure is accompanied by a sharp transition from a long- to a restricted-connectivity water structuring, which is interpreted as a concurrent transition from a stable to a temporary polymer network. The intermolecular associations are considered to be originated by hydrophobic interactions between the nonpolar groups of the polymer backbones.
Collapse
Affiliation(s)
- Paolo Matteini
- Institute of Applied Physics Nello Carrara, National Research Council, Florence, Italy
| | | | | | | | | | | |
Collapse
|
19
|
Crouzier T, Ren K, Nicolas C, Roy C, Picart C. Layer-by-layer films as a biomimetic reservoir for rhBMP-2 delivery: controlled differentiation of myoblasts to osteoblasts. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2009; 5:598-608. [PMID: 19219837 DOI: 10.1002/smll.200800804] [Citation(s) in RCA: 171] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Efficient delivery of growth or survival factors to cells is one of the most important long-term challenges of current cell-based tissue engineering strategies. The extracellular matrix acts as a reservoir for a number of growth factors through interactions with its components. In the matrix, growth factors are protected against circulating proteases and locally concentrated. Thus, the localized and long-lasting delivery of a matrix-bound recombinant human bone morphogenetic protein 2 (rhBMP-2) from a biomaterial surface would mimic in vivo conditions and increase BMP-2 efficiency by limiting its degradation. Herein, it is shown that crosslinked poly(L-lysine)/hyaluronan (HA) layer-by-layer films can serve as a reservoir for rhBMP-2 delivery to myoblasts and induce their differentiation into osteoblasts in a dose-dependent manner. The amount of rhBMP-2 loaded in the films is controlled by varying the deposition conditions and the film thickness. Its local concentration in the film is increased up to approximately 500-fold when compared to its initial solution concentration. Its adsorption on the films, as well as its diffusion within the films, is evidenced by microfluorimetry and confocal microscopy observations. A direct interaction of rhBMP-2 with HA is demonstrated by size-exclusion chromatography, which could be at the origin of the rhBMP-2 "trapping" in the film and of its low release from the films. The bioactivity of rhBMP-2-loaded films is due neither to film degradation nor to rhBMP-2 release. The rhBMP-2-containing films are extremely resistant and could sustain three successive culture sequences while remaining bioactive, thus confirming the important and protective effect of rhBMP-2 immobilization. These films may find applications in the local delivery of immobilized growth factors for tissue-engineered constructs and for metallic biomaterial surfaces, as they can be deposited on a wide range of substrates with different shapes, sizes, and composition.
Collapse
Affiliation(s)
- Thomas Crouzier
- UMR 5235 Dynamique des Interactions Membranaires Normales et Pathologiques CNRS, Université Montpellier II et I cc 107, Montpellier, France
| | | | | | | | | |
Collapse
|
20
|
Wan Z, Li L, Cui S. Capturing the portrait of isolated individual natural cellulose molecules. Biopolymers 2008; 89:1170-3. [DOI: 10.1002/bip.21070] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
21
|
Hsiong SX, Cooke PH, Kong HJ, Fishman ML, Ericsson M, Mooney DJ. AFM imaging of RGD presenting synthetic extracellular matrix using gold nanoparticles. Macromol Biosci 2008; 8:469-77. [PMID: 18383570 DOI: 10.1002/mabi.200700313] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Several high-resolution imaging techniques such as FESEM, TEM and AFM are compared with respect to their application on alginate hydrogels, a widely used polysaccharide biomaterial. A new AFM method applicable to RGD peptides covalently conjugated to alginate hydrogels is described. High-resolution images of RGD adhesion ligand distribution were obtained by labeling biotinylated RGD peptides with streptavidin-labeled gold nanoparticles. This method may broadly provide a useful tool for sECM characterization and design for tissue regeneration strategies.
Collapse
Affiliation(s)
- Susan X Hsiong
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, USA
| | | | | | | | | | | |
Collapse
|
22
|
Tadros MI. The influence of sodium hyaluronate, L-leucine and sodium taurocholate on the nebulization of aqueous betamethasone-17-valerate suspensions. AAPS PharmSciTech 2008; 9:243-9. [PMID: 18446488 DOI: 10.1208/s12249-008-9044-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2007] [Accepted: 01/11/2008] [Indexed: 11/30/2022] Open
Abstract
The purpose of this research was to evaluate the variables that are suggested to influence the adsorption of the hydrophilic hyaluronic acid (HA) onto the surface of the hydrophobic betamethasone-17-valerate (BV) particles in order to formulate a nebulizable suspension. The adsorption of HA from aqueous solutions (0.04% to 0.16%, w/v) to a fixed BV concentration (0.04%, w/v) under different experimental conditions, was investigated. The method of preparation of HA-BV suspensions involved suspending BV particles either in the hydrated HA solution (method 1) or in water followed by addition of solid HA (method 2). Other variables like the time required for the adsorption to complete and temperature at which adsorption is carried out were studied. The nebulization of the suspensions was tested via an air jet nebulizer connected to a twin stage impinger. In order to improve the nebulization behavior of the optimized suspension, L-leucine or sodium taurocholate was incorporated in increasing concentrations (0.01-0.04%, w/v). The optimized suspension, having a nebulization efficiency of 33.75%, was achieved following the adsorption of HA (0.1%, w/v) onto BV particles adopting method 2 of preparation and extending for three days at 4 degrees C. Incorporation of either l-leucine or sodium taurocholate significantly decreased the aggregate size of the optimized suspension and consequently caused significant increases in the nebulization efficiency to reach 46.87% and 56.25%, respectively.
Collapse
|
23
|
Behaviour of wetting films of sodium hyaluronate saline solutions. J Colloid Interface Sci 2008; 317:536-43. [DOI: 10.1016/j.jcis.2007.09.074] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2007] [Revised: 09/24/2007] [Accepted: 09/27/2007] [Indexed: 11/20/2022]
|
24
|
Rinaudo M. Main properties and current applications of some polysaccharides as biomaterials. POLYM INT 2008. [DOI: 10.1002/pi.2378] [Citation(s) in RCA: 672] [Impact Index Per Article: 42.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
25
|
Yokota S, Ueno T, Kitaoka T, Wariishi H. Molecular imaging of single cellulose chains aligned on a highly oriented pyrolytic graphite surface. Carbohydr Res 2007; 342:2593-8. [PMID: 17889844 DOI: 10.1016/j.carres.2007.08.018] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2007] [Revised: 08/18/2007] [Accepted: 08/20/2007] [Indexed: 10/22/2022]
Abstract
Individual cellulose macromolecules were successfully visualized on a highly oriented pyrolytic graphite (HOPG) surface by tapping-mode atomic force microscopy under ambient condition. Monomolecular-level dispersion of cellulose chains was achieved through the momentary contact of dilute cellulose/cupri-ethylenediamine (Cu-ED) solution onto the HOPG substrate. Both concentrations of cellulose and Cu-ED provided critical impacts on the topographical images. Single cellulose chains with molecular height of ca. 0.55 nm could be observed under the optimal conditions, showing rigid molecular rods with a unique morphology of hexagonal regularity. It was strongly suggested that the cellulose chains were aligned along the HOPG crystal lattice through a specific attraction, possibly due to a CH-pi interaction between the axial plane of cellulose and the HOPG pi-conjugated system. These phenomena would imply the potential applications of an HOPG substrate for not only nano-level imaging, but also for molecular alignment of cellulose and other structural polysaccharides.
Collapse
Affiliation(s)
- Shingo Yokota
- Department of Forest and Forest Products Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 812-8581, Japan
| | | | | | | |
Collapse
|
26
|
Östmark E, Lindqvist J, Nyström D, Malmström E. Dendronized Hydroxypropyl Cellulose: Synthesis and Characterization of Biobased Nanoobjects. Biomacromolecules 2007; 8:3815-22. [DOI: 10.1021/bm7007394] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Emma Östmark
- Royal Institute of Technology, KTH Fibre and Polymer Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| | - Josefina Lindqvist
- Royal Institute of Technology, KTH Fibre and Polymer Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| | - Daniel Nyström
- Royal Institute of Technology, KTH Fibre and Polymer Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| | - Eva Malmström
- Royal Institute of Technology, KTH Fibre and Polymer Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| |
Collapse
|
27
|
Yokota S, Ueno T, Kitaoka T, Tatsumi D, Wariishi H. Morphological Imaging of Single Methylcellulose Chains and Their Thermoresponsive Assembly on a Highly Oriented Pyrolytic Graphite Surface. Biomacromolecules 2007; 8:3848-52. [DOI: 10.1021/bm700819f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shingo Yokota
- Department of Forest and Forest Products Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 812-8581, Japan
| | - Tomotsugu Ueno
- Department of Forest and Forest Products Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 812-8581, Japan
| | - Takuya Kitaoka
- Department of Forest and Forest Products Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 812-8581, Japan
| | - Daisuke Tatsumi
- Department of Forest and Forest Products Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 812-8581, Japan
| | - Hiroyuki Wariishi
- Department of Forest and Forest Products Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 812-8581, Japan
| |
Collapse
|
28
|
Ueno T, Yokota S, Kitaoka T, Wariishi H. Conformational changes in single carboxymethylcellulose chains on a highly oriented pyrolytic graphite surface under different salt conditions. Carbohydr Res 2007; 342:954-60. [PMID: 17316582 DOI: 10.1016/j.carres.2007.01.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2006] [Revised: 01/22/2007] [Accepted: 01/25/2007] [Indexed: 11/21/2022]
Abstract
Conformational changes in individual carboxymethylcellulose (CMC) chains deposited on a highly oriented pyrolytic graphite (HOPG) surface were investigated by atomic force microscopy (AFM). A small amount of CMC solution with various salt concentrations was deposited onto the HOPG surface. The CMC molecular chains adsorbed onto the HOPG surface were clearly visualized using tapping-mode AFM under ambient conditions, as compared with those on a hydrophilic mica surface. Each CMC chain was distinguishable at the molecular level based on the vertical profiles of the AFM images, and probably aligned along the HOPG crystal lattice. Higher NaCl concentrations brought about dramatic conformational changes from aligned single chains to globular aggregates via the molecular network structure only on the HOPG surface through electrostatic screening of the CM groups. Although CMC is a water-soluble hydrophilic polyelectrolyte, some interaction, possibly due to a CH-pi bonding between the glucopyranosic axial plane of CMC and the aromatic rings of HOPG, is considered to be effective and dominant for the unique molecular attachment. These phenomena would imply the potential use of HOPG as a substrate for not only molecular imaging, but also for nano-scale morphological control of cellulosic polymers and other structural polysaccharides.
Collapse
Affiliation(s)
- Tomotsugu Ueno
- Department of Forest and Forest Products Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 812-8581, Japan
| | | | | | | |
Collapse
|
29
|
Schneider A, Vodouhê C, Richert L, Francius G, Le Guen E, Schaaf P, Voegel JC, Frisch B, Picart C. Multifunctional polyelectrolyte multilayer films: combining mechanical resistance, biodegradability, and bioactivity. Biomacromolecules 2007; 8:139-45. [PMID: 17206799 PMCID: PMC2535908 DOI: 10.1021/bm060765k] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cross-linked polyelectrolyte multilayer films (CL PEM) have an increased rigidity and are mechanically more resistant than native (e.g., uncrosslinked) films. However, they are still biodegradable, which make them interesting candidates for biomedical applications. In this study, CL PEM films have been explored for their multifunctional properties as (i) mechanically resistant, (ii) biodegradable, and (iii) bioactive films. Toward this end, we investigated drug loading into CL chitosan/hyaluronan (CHI/HA) and poly(L-lysine)/hyaluronan (PLL/HA) films by simple diffusion of the drugs. Sodium diclofenac and paclitaxel were chosen as model drugs and were successfully loaded into the films. The effect of varying the number of layers in the (CHI/HA) films as well as the cross-linker concentration on diclofenac loading were studied. Diclofenac was released from the film in about 10 h. Paclitaxel was also found to diffuse within CL films. Its activity was maintained after loading in the CL films, and cellular viability could be reduced by about 55% over 3 days. Such a simple approach may be applied to other types of cross-linked films and to other drugs. These results prove that it is possible to design multifunctional multilayer films that combine mechanical resistance, biodegradability, and bioactivity properties into a single PEM architecture.
Collapse
Affiliation(s)
- Aurore Schneider
- Institut National de la Santé et de la Recherche Médicale, Unité 595, Faculté de Chirurgie Dentaire, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg Cedex, France
- Laboratoire de Chimie Enzymatique et Vectorisation LC01, UMR 7175 CNRS-Université Louis Pasteur, 74 route du Rhin, 67 400 Illkirch, France
| | - Constant Vodouhê
- Institut National de la Santé et de la Recherche Médicale, Unité 595, Faculté de Chirurgie Dentaire, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg Cedex, France
| | - Ludovic Richert
- Institut National de la Santé et de la Recherche Médicale, Unité 595, Faculté de Chirurgie Dentaire, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg Cedex, France
| | - Gregory Francius
- Institut National de la Santé et de la Recherche Médicale, Unité 595, Faculté de Chirurgie Dentaire, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg Cedex, France
| | - Erell Le Guen
- Institut National de la Santé et de la Recherche Médicale, Unité 595, Faculté de Chirurgie Dentaire, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg Cedex, France
| | - Pierre Schaaf
- Institut Charles Sadron, Centre National de la Recherche Scientifique, Université Louis Pasteur, 6 rue Boussingault, 67083 Strasbourg Cedex, France
| | - Jean-Claude Voegel
- Institut National de la Santé et de la Recherche Médicale, Unité 595, Faculté de Chirurgie Dentaire, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg Cedex, France
| | - Benoît Frisch
- Laboratoire de Chimie Enzymatique et Vectorisation LC01, UMR 7175 CNRS-Université Louis Pasteur, 74 route du Rhin, 67 400 Illkirch, France
| | - Catherine Picart
- Institut National de la Santé et de la Recherche Médicale, Unité 595, Faculté de Chirurgie Dentaire, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg Cedex, France
| |
Collapse
|
30
|
Rouse JJ, Whateley TL, Thomas M, Eccleston GM. Controlled drug delivery to the lung: Influence of hyaluronic acid solution conformation on its adsorption to hydrophobic drug particles. Int J Pharm 2006; 330:175-82. [PMID: 17207592 DOI: 10.1016/j.ijpharm.2006.11.066] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2006] [Revised: 11/24/2006] [Accepted: 11/27/2006] [Indexed: 10/23/2022]
Abstract
This work reports investigations into the interaction and adsorption of the hydrophilic polymer hyaluronic acid (HA) onto the surface of the hydrophobic corticosteroid drug fluticasone propionate (FP). The eventual aim is to formulate a bioadhesive pulmonary drug delivery system with prolonged action that avoids rapid clearance from the lungs by the mucociliary escalator. Adsorption isotherms detailing the adsorption of HA from aqueous HA solution concentrations ranging from 0.14 to 0.0008% (w/v) to a fixed FP particle concentration of 0.1% (w/v) were investigated. The method of preparing FP particles with HA molecules adsorbed on their surfaces (FP/HA particles) involved suspension of the FP either in hydrated HA solution or in water followed by addition of solid HA, centrifugation of the solids to form a pellet, washing the pellet several times with water until no HA was found in the supernatant and then freeze drying the suspension obtained by dispersing the final pellet. The freeze dried powder was then analysed for adsorbed HA using a Stains-all assay. The influence of order of addition of HA to FP, time for the adsorption process, and temperature of preparation on the adsorption isotherms was investigated. The non-equilibrium adsorption isotherms produced generally followed the same trend, in that as the HA solution concentration increased, the amount of HA adsorbed increased to a maximum at a solution concentration of approximately 0.1% (w/v) and then decreased. The maxima in the adsorption isotherms were close to the change from secondary to tertiary conformation in the HA solutions. Below the maxima, adsorption occurred via interaction of FP with the hydrophobic patches along the HA chains in the secondary structures. Above the maxima, secondary HA molecules aggregate in solution to form tertiary network structures. Adsorption from tertiary structure was reduced because strong interactions between the HA molecules limited the availability of hydrophobic patches for adsorption of HA onto FP. The influence of preparation variables on adsorption was also related to the availability of hydrophobic patches for adsorption.
Collapse
Affiliation(s)
- J J Rouse
- Department of Pharmaceutical Sciences, University of Strathclyde, Glasgow G4 ONR, UK
| | | | | | | |
Collapse
|
31
|
Cowman MK, Matsuoka S. Experimental approaches to hyaluronan structure. Carbohydr Res 2005; 340:791-809. [PMID: 15780246 DOI: 10.1016/j.carres.2005.01.022] [Citation(s) in RCA: 236] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2004] [Accepted: 01/10/2005] [Indexed: 12/17/2022]
Abstract
A review of the literature describing experimental studies on hyaluronan (HA) is presented. Methods sensitive to the hydrodynamic properties of HA, analyzed in neutral aqueous solution containing NaCl at physiological concentration, can be shown to fit the expected behavior of a high molecular weight linear semi-flexible polymer. The significant nonideality of HA solutions can be predicted by a simple treatment for hydrodynamic interactions between polymer chains. Nuclear magnetic resonance and circular dichroism studies of HA are also in agreement with a model incorporating dynamically formed and broken hydrogen bonds, contributing to the semi-flexibility of the polymer chain, and segmental motions on the nanosecond time scale. HA shows the capability for self-association in the formation of a viscoelastic putty state at pH 2.5 in the presence of salt, and a gel state at pH 2.5 in mixed organic/aqueous solution containing salt. Ordered and associated structures have also been observed for HA on the surfaces, especially in the presence of surface-structured water. These phenomena can be understood in terms of counterion-mediated polyelectrolyte interactions. The possibility that hyaluronan exists in vivo in environments that induce ordered structures and assemblies is discussed.
Collapse
Affiliation(s)
- Mary K Cowman
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, 6 Metrotech Center, Brooklyn, NY 11201, USA.
| | | |
Collapse
|