1
|
Pan F, Aaron Lau KH, Messersmith PB, Lu JR, Zhao X. Interfacial Assembly Inspired by Marine Mussels and Antifouling Effects of Polypeptoids: A Neutron Reflection Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12309-12318. [PMID: 32970448 PMCID: PMC7586401 DOI: 10.1021/acs.langmuir.0c02247] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/24/2020] [Indexed: 06/11/2023]
Abstract
Polypeptoid-coated surfaces and many surface-grafted hydrophilic polymer brushes have been proven efficient in antifouling-the prevention of nonspecific biomolecular adsorption and cell attachment. Protein adsorption, in particular, is known to mediate subsequent cell-surface interactions. However, the detailed antifouling mechanism of polypeptoid and other polymer brush coatings at the molecular level is not well understood. Moreover, most adsorption studies focus only on measuring a single adsorbed mass value, and few techniques are capable of characterizing the hydrated in situ layer structure of either the antifouling coating or adsorbed proteins. In this study, interfacial assembly of polypeptoid brushes with different chain lengths has been investigated in situ using neutron reflection (NR). Consistent with past simulation results, NR revealed a common two-step structure for grafted polypeptoids consisting of a dense inner region that included a mussel adhesive-inspired oligopeptide for grafting polypeptoid chains and a highly hydrated upper region with very low polymer density (molecular brush). Protein adsorption was studied with human serum albumin (HSA) and fibrinogen (FIB), two common serum proteins of different sizes but similar isoelectric points (IEPs). In contrast to controls, we observed higher resistance by grafted polypeptoid against adsorption of the larger FIB, especially for longer chain lengths. Changing the pH to close to the IEPs of the proteins, which generally promotes adsorption, also did not significantly affect the antifouling effect against FIB, which was corroborated by atomic force microscopy imaging. Moreover, NR enabled characterization of the in situ hydrated layer structures of the polypeptoids together with proteins adsorbed under selected conditions. While adsorption on bare SiO2 controls resulted in surface-induced protein denaturation, this was not observed on polypeptoids. Our current results therefore highlight the detailed in situ view that NR may provide for characterizing protein adsorption on polymer brushes as well as the excellent antifouling behavior of polypeptoids.
Collapse
Affiliation(s)
- Fang Pan
- School
of Pharmacy, Changzhou University, Changzhou 213164, China
- School
of Physics & Astronomy, University of
Manchester, Manchester M13 9PL, U.K.
| | - King Hang Aaron Lau
- Department
of Pure & Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, U.K.
| | - Phillip B. Messersmith
- Department
of Materials Science and Engineering, Department of Bioengineering, University of California−Berkeley, Berkeley California 94720, United States
| | - Jian R. Lu
- School
of Physics & Astronomy, University of
Manchester, Manchester M13 9PL, U.K.
| | - Xiubo Zhao
- School
of Pharmacy, Changzhou University, Changzhou 213164, China
- Department
of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, U.K.
| |
Collapse
|
2
|
Obiweluozor FO, Emechebe GA, Kim DW, Cho HJ, Park CH, Kim CS, Jeong IS. Considerations in the Development of Small-Diameter Vascular Graft as an Alternative for Bypass and Reconstructive Surgeries: A Review. Cardiovasc Eng Technol 2020; 11:495-521. [PMID: 32812139 DOI: 10.1007/s13239-020-00482-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Accepted: 08/11/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND Current design strategies for small diameter vascular grafts (< 6 mm internal diameter; ID) are focused on mimicking native vascular tissue because the commercially available grafts still fail at small diameters, notably due to development of intimal hyperplasia and thrombosis. To overcome these challenges, various design approaches, material selection, and surface modification strategies have been employed to improve the patency of small-diameter grafts. REVIEW The purpose of this review is to outline various considerations in the development of small-diameter vascular grafts, including material choice, surface modifications to enhance biocompatibility/endothelialization, and mechanical properties of the graft, that are currently being implanted. Additionally, we have taken into account the general vascular physiology, tissue engineering approaches, and collective achievements of the authors in this area. We reviewed both commercially available synthetic grafts (e-PTFE and PET), elastic polymers such as polyurethane and biodegradable and bioresorbable materials. We included naturally occurring materials by focusing on their potential application in the development of future vascular alternatives. CONCLUSION Until now, there are few comprehensive reviews regarding considerations in the design of small-diameter vascular grafts in the literature. Here-in, we have discussed in-depth the various strategies employed to generate engineered vascular graft due to their high demand for vascular surgeries. While some TEVG design strategies have shown greater potential in contrast to autologous or synthetic ePTFE conduits, many are still hindered by high production cost which prevents their widespread adoption. Nonetheless, as tissue engineers continue to develop on their strategies and procedures for improved TEVGs, soon, a reliable engineered graft will be available in the market. Hence, we anticipate a viable TEVG with resorbable property, fabricated via electrospinning approach to hold a greater potential that can overcome the challenges observed in both autologous and allogenic grafts. This is because they can be mechanically tuned, incorporated/surface-functionalized with bioactive molecules and mass-manufactured in a reproducible manner. It is also found that most of the success in engineered vascular graft approaching commercialization is for large vessels rather than small-diameter grafts used as cardiovascular bypass grafts. Consequently, the field of vascular engineering is still available for future innovators that can take up the challenge to create a functional arterial substitute.
Collapse
Affiliation(s)
- Francis O Obiweluozor
- Department of Cardiac and Thoracic Surgery, Chonnam National University Hospital and Medical School, 42 Jebong-Ro Dong-gu, Gwangju, 501-757, Republic of Korea.
| | - Gladys A Emechebe
- Department of Bionanosystem Engineering Graduate School, Chonbuk National University, Jeonju City, Republic of Korea
| | - Do-Wan Kim
- Department of Cardiac and Thoracic Surgery, Chonnam National University Hospital and Medical School, 42 Jebong-Ro Dong-gu, Gwangju, 501-757, Republic of Korea
| | - Hwa-Jin Cho
- Department of Cardiac and Thoracic Surgery, Chonnam National University Hospital and Medical School, 42 Jebong-Ro Dong-gu, Gwangju, 501-757, Republic of Korea
| | - Chan Hee Park
- Department of Bionanosystem Engineering Graduate School, Chonbuk National University, Jeonju City, Republic of Korea
- Department of Mechanical Engineering Graduate School, Chonbuk National University, Jeonju City, Republic of Korea
| | - Cheol Sang Kim
- Department of Bionanosystem Engineering Graduate School, Chonbuk National University, Jeonju City, Republic of Korea
- Department of Mechanical Engineering Graduate School, Chonbuk National University, Jeonju City, Republic of Korea
| | - In Seok Jeong
- Department of Cardiac and Thoracic Surgery, Chonnam National University Hospital and Medical School, 42 Jebong-Ro Dong-gu, Gwangju, 501-757, Republic of Korea.
| |
Collapse
|
3
|
Olvera D, Sathy BN, Kelly DJ. Spatial Presentation of Tissue-Specific Extracellular Matrix Components along Electrospun Scaffolds for Tissue Engineering the Bone-Ligament Interface. ACS Biomater Sci Eng 2020; 6:5145-5161. [PMID: 33455265 DOI: 10.1021/acsbiomaterials.0c00337] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The bone-ligament interface transitions from a highly organized type I collagen rich matrix to a nonmineralized fibrocartilage region and finally to a mineralized fibrocartilage region that interfaces with the bone. Therefore, engineering the bone-ligament interface requires a biomaterial substrate capable of maintaining or directing the spatially defined differentiation of multiple cell phenotypes. To date the appropriate combination of biophysical and biochemical factors that can be used to engineer such a biomaterial substrate remain unknown. Here we show that microfiber scaffolds functionalized with tissue-specific extracellular matrix (ECM) components can direct the differentiation of MSCs toward the phenotypes seen at the bone-ligament interface. Ligament-ECM (L-ECM) promoted the expression of the ligament-marker gene tenomodulin (TNMD) and higher levels of type I and III collagen expression compared to functionalization with commercially available type I collagen. Functionalization of microfiber scaffolds with cartilage-ECM (C-ECM) promoted chondrogenesis of MSCs, as evidenced by adoption of a round cell morphology and increased SRY-box 9 (SOX9) expression in the absence of exogenous growth factors. Next, we fabricated a multiphasic scaffold by controlling the spatial presentation of L-ECM and C-ECM along the length of a single electrospun microfiber construct, with the distal region of the C-ECM coated fibers additionally functionalized with an apatite layer (using simulated body fluid) to promote endochondral ossification. These ECM functionalized scaffolds promoted spatially defined differentiation of MSCs, with higher expression of TNMD observed in the region functionalized with L-ECM, and higher expression of type X collagen and osteopontin (markers of endochondral ossification) observed at the end of the scaffold functionalized with C-ECM and the apatite coating. Our results demonstrate the utility of tissue-specific ECM derived components as a cue for directing MSC differentiation when engineering complex multiphasic interfaces such as the bone-ligament enthesis.
Collapse
Affiliation(s)
- Dinorath Olvera
- Trinity Centre for Biomedical Engineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland.,Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland
| | - Binulal N Sathy
- Trinity Centre for Biomedical Engineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland.,Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland.,Centre for Nanosciences & Molecular Medicine, Amrita Institute of Medical Sciences and Research Centre, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Daniel J Kelly
- Trinity Centre for Biomedical Engineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland.,Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland.,Department of Anatomy and Regenerative Medicine, Royal College of Surgeons in Ireland, Dublin 2, Ireland.,Advanced Materials and Bioengineering Research Centre (AMBER), Royal College of Surgeons in Ireland and Trinity College Dublin, Dublin 2, Ireland
| |
Collapse
|
4
|
Recent Advances in Studying Interfacial Adsorption of Bioengineered Monoclonal Antibodies. Molecules 2020; 25:molecules25092047. [PMID: 32353995 PMCID: PMC7249052 DOI: 10.3390/molecules25092047] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 03/13/2020] [Accepted: 04/23/2020] [Indexed: 11/24/2022] Open
Abstract
Monoclonal antibodies (mAbs) are an important class of biotherapeutics; as of 2020, dozens are commercialized medicines, over a hundred are in clinical trials, and many more are in preclinical developmental stages. Therapeutic mAbs are sequence modified from the wild type IgG isoforms to varying extents and can have different intrinsic structural stability. For chronic treatments in particular, high concentration (≥ 100 mg/mL) aqueous formulations are often preferred for at-home administration with a syringe-based device. MAbs, like any globular protein, are amphiphilic and readily adsorb to interfaces, potentially causing structural deformation and even unfolding. Desorption of structurally perturbed mAbs is often hypothesized to promote aggregation, potentially leading to the formation of subvisible particles and visible precipitates. Since mAbs are exposed to numerous interfaces during biomanufacturing, storage and administration, many studies have examined mAb adsorption to different interfaces under various mitigation strategies. This review examines recent published literature focusing on adsorption of bioengineered mAbs under well-defined solution and surface conditions. The focus of this review is on understanding adsorption features driven by distinct antibody domains and on recent advances in establishing model interfaces suitable for high resolution surface measurements. Our summary highlights the need to further understand the relationship between mAb interfacial adsorption and desorption, solution aggregation, and product instability during fill-finish, transport, storage and administration.
Collapse
|
5
|
Firkowska-Boden I, Zhang X, Jandt KD. Controlling Protein Adsorption through Nanostructured Polymeric Surfaces. Adv Healthc Mater 2018; 7. [PMID: 29193909 DOI: 10.1002/adhm.201700995] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 10/09/2017] [Indexed: 12/11/2022]
Abstract
The initial host response to healthcare materials' surfaces after implantation is the adsorption of proteins from blood and interstitial fluids. This adsorbed protein layer modulates the biological/cellular responses to healthcare materials. This stresses the significance of the surface protein assembly for the biocompatibility and functionality of biomaterials and necessitates a profound fundamental understanding of the capability to control protein-surface interactions. This review, therefore, addresses this by systematically analyzing and discussing strategies to control protein adsorption on polymeric healthcare materials through the introduction of specific surface nanostructures. Relevant proteins, healthcare materials' surface properties, clinical applications of polymer healthcare materials, fabrication methods for nanostructured polymer surfaces, amorphous, semicrystalline and block copolymers are considered with a special emphasis on the topographical control of protein adsorption. The review shows that nanostructured polymer surfaces are powerful tools to control the amount, orientation, and order of adsorbed protein layers. It also shows that the understanding of the biological responses to such ordered protein adsorption is still in its infancy, yet it has immense potential for future healthcare materials. The review, which is-as far as it is known-the first one discussing protein adsorption on nanostructured polymer surfaces, concludes with highlighting important current research questions.
Collapse
Affiliation(s)
- Izabela Firkowska-Boden
- Chair of Materials Science (CMS); Otto Schott Institute of Materials Research (OSIM); Friedrich Schiller University Jena; Löbdergraben 32 07743 Jena Germany
| | - Xiaoyuan Zhang
- Chair of Materials Science (CMS); Otto Schott Institute of Materials Research (OSIM); Friedrich Schiller University Jena; Löbdergraben 32 07743 Jena Germany
| | - Klaus D. Jandt
- Chair of Materials Science (CMS); Otto Schott Institute of Materials Research (OSIM); Friedrich Schiller University Jena; Löbdergraben 32 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
- Jena School for Microbial Communication (JSMC); Neugasse 23 07743 Jena Germany
| |
Collapse
|
6
|
Magyari K, Vanea E, Baia L, Simon V. Attachment and conformational changes of collagen on bioactive glass surface. Biomed Mater Eng 2016; 27:63-74. [DOI: 10.3233/bme-161567] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- K. Magyari
- Faculty of Physics & Interdisciplinary Research Institute on Bio-Nano-Sciences, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
| | - E. Vanea
- Faculty of Physics & Interdisciplinary Research Institute on Bio-Nano-Sciences, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
| | - L. Baia
- Faculty of Physics & Interdisciplinary Research Institute on Bio-Nano-Sciences, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
| | - V. Simon
- Faculty of Physics & Interdisciplinary Research Institute on Bio-Nano-Sciences, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
| |
Collapse
|
7
|
Dragneva N, Rubel O, Floriano WB. Molecular Dynamics of Fibrinogen Adsorption onto Graphene, but Not onto Poly(ethylene glycol) Surface, Increases Exposure of Recognition Sites That Trigger Immune Response. J Chem Inf Model 2016; 56:706-20. [DOI: 10.1021/acs.jcim.5b00703] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Nadiya Dragneva
- Thunder Bay Regional Research Institute, 290 Munro Street, Thunder Bay, Ontario P7A 7T1, Canada
- Biotechnology
Ph.D. Program, Faculty of Science and Environment Studies, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
| | - Oleg Rubel
- Thunder Bay Regional Research Institute, 290 Munro Street, Thunder Bay, Ontario P7A 7T1, Canada
- Department
of Materials Science and Engineering, McMaster University, 1280 Main
Street West, Hamilton, Ontario L8S 4L8, Canada
| | - Wely B. Floriano
- Thunder Bay Regional Research Institute, 290 Munro Street, Thunder Bay, Ontario P7A 7T1, Canada
- Biotechnology
Ph.D. Program, Faculty of Science and Environment Studies, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
- Department
of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
| |
Collapse
|
8
|
Zeng Q, Qin J, Yin X, Liu H, Zhu L, Dong W, Zhang S. Preparation and hemocompatibility of electrospun O-carboxymethyl chitosan/PVA nanofibers. J Appl Polym Sci 2016. [DOI: 10.1002/app.43565] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Qinghuan Zeng
- Hainan Provincial Fine Chemical Engineering Research Center; Hainan University; Haikou Hainan 570228 People's Republic of China
| | - Jinmin Qin
- Hainan Provincial Fine Chemical Engineering Research Center; Hainan University; Haikou Hainan 570228 People's Republic of China
| | - Xueqiong Yin
- Hainan Provincial Fine Chemical Engineering Research Center; Hainan University; Haikou Hainan 570228 People's Republic of China
| | - Haifang Liu
- Affiliated Haikou Hospital, Xiangya School of Medicine central south University; Haikou Municipal People's Hospital; Haikou Hainan 570208 People's Republic of China
| | - Li Zhu
- Hainan Provincial Fine Chemical Engineering Research Center; Hainan University; Haikou Hainan 570228 People's Republic of China
| | - Wenyuan Dong
- Hainan Provincial Fine Chemical Engineering Research Center; Hainan University; Haikou Hainan 570228 People's Republic of China
| | - Song Zhang
- Hainan Provincial Fine Chemical Engineering Research Center; Hainan University; Haikou Hainan 570228 People's Republic of China
| |
Collapse
|
9
|
Ge A, Seo JH, Qiao L, Yui N, Ye S. Structural Reorganization and Fibrinogen Adsorption Behaviors on the Polyrotaxane Surfaces Investigated by Sum Frequency Generation Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2015; 7:22709-22718. [PMID: 26393413 DOI: 10.1021/acsami.5b07760] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Polyrotaxanes, such as supramolecular assemblies with methylated α-cyclodextrins (α-CDs) as host molecules noncovalently threaded on the linear polymer backbone, are promising materials for biomedical applications because they allow adsorbed proteins possessing a high surface flexibility as well as control of the cellular morphology and adhesion. To provide a general design principle for biomedical materials, we examined the surface reorganization behaviors and adsorption conformations of fibrinogen on the polyrotaxane surfaces with comparison to several random copolymers by sum frequency generation (SFG) vibrational spectroscopy. We showed that the polyrotaxane (OMe-PRX-PMB) with methylated α-CDs as the host molecule exhibited unique surface structures in an aqueous environment. The hydrophobic interaction between the methoxy groups of the methylated α-CD molecules and methyl groups of the n-butyl methacrylate (BMA) side chains may dominate the surface restructuring behavior of the OMe-PRX-PMB. The orientation analysis revealed that the orientation of the fibrinogen adsorbed on the OMe-PRX-PMB surface is close to a single distribution, which is different from the adsorption behaviors of fibrinogen on other polyrotaxane or random copolymer surfaces.
Collapse
Affiliation(s)
- Aimin Ge
- Catalysis Research Center, Hokkaido University , Sapporo 001-0021, Japan
| | - Ji-Hun Seo
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University , Tokyo 101-0062, Japan
| | - Lin Qiao
- Catalysis Research Center, Hokkaido University , Sapporo 001-0021, Japan
| | - Nobuhiko Yui
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University , Tokyo 101-0062, Japan
| | - Shen Ye
- Catalysis Research Center, Hokkaido University , Sapporo 001-0021, Japan
| |
Collapse
|
10
|
Stoleru E, Baican MC, Coroaba A, Hitruc GE, Lungu M, Vasile C. Plasma-activated fibrinogen coatings onto poly(vinylidene fluoride) surface for improving biocompatibility with tissues. J BIOACT COMPAT POL 2015. [DOI: 10.1177/0883911515595236] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
CO2, N2, and N2/H2 radiofrequency plasma exposure was used for functionalization of poly(vinylidene fluoride) surface aiming the fibrinogen immobilization. Fibrinogen was immobilized onto poly(vinylidene fluoride) surface using both simple plasma activation and covalent coupling. The modified surfaces have been characterized by X-ray photoelectron spectroscopy, attenuated total reflectance–Fourier transform infrared spectroscopy, near infrared–chemical imaging, atomic force microscopy, and wettability measurements, and the obtained materials were tested as supports for fibroblast cell cultures. The plasma type and the immobilization procedure have influenced the fibrinogen attachment onto the poly(vinylidene fluoride) surface, which was achieved mainly through amide bonds when using coupling agents. Covalent immobilization of fibrinogen onto poly(vinylidene fluoride) surface leads to a more stable protein-modified polymer surface. Non-cytotoxic plasma-based coating technology has the ability to covalently immobilize bioactive molecules for surface modification of some biomaterials that mainly could be achieved by the immobilization of proteins such as fibrinogen that triggers desirable cellular responses. The fibrinogen-modified poly(vinylidene fluoride) materials showed increased cell viability of fibroblasts. Cell viability was enhanced by plasma-activated fibrinogen coatings onto poly(vinylidene fluoride) surface, this being more significant if coating was linked further by a coupling reaction. Hence, they could be good candidates for biomedical applications.
Collapse
Affiliation(s)
- Elena Stoleru
- “P. Poni” Institute of Macromolecular Chemistry, Iasi, Romania
| | - Mihaela C Baican
- “Gr. T. Popa” University of Medicine and Pharmacy, Iasi, Romania
| | - Adina Coroaba
- “P. Poni” Institute of Macromolecular Chemistry, Iasi, Romania
| | | | - Maria Lungu
- National Institute of Research and Development for Biological Sciences, Bucharest, Romania
| | - Cornelia Vasile
- “P. Poni” Institute of Macromolecular Chemistry, Iasi, Romania
| |
Collapse
|
11
|
Innate Immunity and Biomaterials at the Nexus: Friends or Foes. BIOMED RESEARCH INTERNATIONAL 2015; 2015:342304. [PMID: 26247017 PMCID: PMC4515263 DOI: 10.1155/2015/342304] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 06/15/2015] [Accepted: 06/22/2015] [Indexed: 01/04/2023]
Abstract
Biomaterial implants are an established part of medical practice, encompassing a broad range of devices that widely differ in function and structural composition. However, one common property amongst biomaterials is the induction of the foreign body response: an acute sterile inflammatory reaction which overlaps with tissue vascularisation and remodelling and ultimately fibrotic encapsulation of the biomaterial to prevent further interaction with host tissue. Severity and clinical manifestation of the biomaterial-induced foreign body response are different for each biomaterial, with cases of incompatibility often associated with loss of function. However, unravelling the mechanisms that progress to the formation of the fibrotic capsule highlights the tightly intertwined nature of immunological responses to a seemingly noncanonical “antigen.” In this review, we detail the pathways associated with the foreign body response and describe possible mechanisms of immune involvement that can be targeted. We also discuss methods of modulating the immune response by altering the physiochemical surface properties of the biomaterial prior to implantation. Developments in these areas are reliant on reproducible and effective animal models and may allow a “combined” immunomodulatory approach of adapting surface properties of biomaterials, as well as treating key immune pathways to ultimately reduce the negative consequences of biomaterial implantation.
Collapse
|
12
|
Protopopova AD, Barinov NA, Zavyalova EG, Kopylov AM, Sergienko VI, Klinov DV. Visualization of fibrinogen αC regions and their arrangement during fibrin network formation by high-resolution AFM. J Thromb Haemost 2015; 13:570-9. [PMID: 25393591 DOI: 10.1111/jth.12785] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 11/09/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND Fibrinogen has been intensively studied with transmission electron microscopy and x-ray diffraction. But until now, a complete 3D structure of the molecule has not yet been available because the two highly flexible αC regions could not be resolved in fibrinogen crystals. This study was aimed at determining whether the αC regions can be visualized by high-resolution atomic force microscopy. METHODS Atomic force microscopy with super high resolution was used to image single molecules of fibrinogen and fibrin associates. The key approach was to use a graphite surface modified with the monolayer of amphiphilic carbohydrate-glycine molecules and unique supersharp cantilevers with 1 nm tip diameter. RESULTS Fibrinogen αC regions were visualized along with the complete domain structure of the protein. In almost all molecules at pH 7.4 the D domain regions had one or two protrusions of average height 0.4 ± 0.1 nm and length 21 ± 6 nm. The complex, formed between thrombin and fibrinogen, was also visualized. Images of growing fibrin fibers with clearly visible αC regions have been obtained. CONCLUSIONS Fibrin αC regions were visible in protofibrils and large fibers; αC regions intertwined near a branchpoint and looked like a zipper. These results support the idea that αC regions are involved in the thickening of fibrin fibers. In addition, new details were revealed about the behavior of individual fibrin molecules during formation of the fibrin network. Under the diluted condition, the positioning of the αC regions could suggest their involvement in long-range interactions between fibrin but not fibrinogen molecules.
Collapse
Affiliation(s)
- A D Protopopova
- Scientific Research Institute of Physical-Chemical Medicine, Moscow, Russia
| | | | | | | | | | | |
Collapse
|
13
|
Stefanović IS, Djonlagić J, Tovilović G, Nestorov J, Antić VV, Ostojić S, Pergal MV. Poly(urethane-dimethylsiloxane) copolymers displaying a range of soft segment contents, noncytotoxic chemistry, and nonadherent properties toward endothelial cells. J Biomed Mater Res A 2014; 103:1459-75. [PMID: 25046378 DOI: 10.1002/jbm.a.35285] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Revised: 07/07/2014] [Accepted: 07/18/2014] [Indexed: 11/09/2022]
Abstract
Polyurethane copolymers based on α,ω-dihydroxypropyl poly(dimethylsiloxane) (PDMS) with a range of soft segment contents were prepared by two-stage polymerization, and their microstructures, thermal, thermomechanical, and surface properties, as well as in vitro hemo- and cytocompatibility were evaluated. All utilized characterization methods confirmed the existence of moderately microphase separated structures with the appearance of some microphase mixing between segments as the PDMS (i.e., soft segment) content increased. Copolymers showed higher crystallinity, storage moduli, surface roughness, and surface free energy, but less hydrophobicity with decreasing PDMS content. Biocompatibility of copolymers was evaluated using an endothelial EA.hy926 cell line by direct contact, an extraction method and after pretreatment of copolymers with multicomponent protein mixture, as well as by a competitive protein adsorption assay. Copolymers showed no toxic effect to endothelial cells and all copolymers, except that with the lowest PDMS content, exhibited resistance to endothelial cell adhesion, suggesting their unsuitability for long-term biomedical devices which particularly require re-endothelialization. All copolymers exhibited excellent resistance to fibrinogen adsorption and adsorbed more albumin than fibrinogen in the competitive adsorption assay, suggesting their good hemocompatibility. The noncytotoxic chemistry of these synthesized materials, combined with their nonadherent properties which are inhospitable to cell attachment and growth, underlie the need for further investigations to clarify their potential for use in short-term biomedical devices.
Collapse
Affiliation(s)
- Ivan S Stefanović
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000, Belgrade, Serbia
| | | | | | | | | | | | | |
Collapse
|
14
|
Chen W, Inoue Y, Ishihara K. Quantitative evaluation of interaction force of fibrinogen at well-defined surfaces with various structures. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2014; 25:1629-40. [DOI: 10.1080/09205063.2014.936925] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
15
|
Magyari K, Baia L, Vulpoi A, Simon S, Popescu O, Simon V. Bioactivity evolution of the surface functionalized bioactive glasses. J Biomed Mater Res B Appl Biomater 2014; 103:261-72. [DOI: 10.1002/jbm.b.33203] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 04/04/2014] [Accepted: 04/24/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Klára Magyari
- Faculty of Physics and Institute of Interdisciplinary Research in Bio-Nano-Sciences; Babes-Bolyai University; 400084 Cluj-Napoca Romania
| | - Lucian Baia
- Faculty of Physics and Institute of Interdisciplinary Research in Bio-Nano-Sciences; Babes-Bolyai University; 400084 Cluj-Napoca Romania
| | - Adriana Vulpoi
- Faculty of Physics and Institute of Interdisciplinary Research in Bio-Nano-Sciences; Babes-Bolyai University; 400084 Cluj-Napoca Romania
| | - Simion Simon
- Faculty of Physics and Institute of Interdisciplinary Research in Bio-Nano-Sciences; Babes-Bolyai University; 400084 Cluj-Napoca Romania
| | - Octavian Popescu
- Molecular Biology Center of Institute of Interdisciplinary Research in Bio-Nano-Sciences, Babes-Bolyai University; 400271 Cluj-Napoca Romania
- Romanian Academy; Institute of Biology; 060031 Bucharest Romania
| | - Viorica Simon
- Faculty of Physics and Institute of Interdisciplinary Research in Bio-Nano-Sciences; Babes-Bolyai University; 400084 Cluj-Napoca Romania
| |
Collapse
|
16
|
Mirmohammadi SA, Imani M, Uyama H, Atai M. Hybrid Organic-Inorganic Nanocomposites Based on Poly(ϵ-Caprolactone)/Polyhedral Oligomeric Silsesquioxane: Synthesis andIn VitroEvaluations. INT J POLYM MATER PO 2014. [DOI: 10.1080/00914037.2013.854236] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
17
|
Pergal MV, Nestorov J, Tovilović G, Ostojić S, Gođevac D, Vasiljević-Radović D, Djonlagić J. Structure and properties of thermoplastic polyurethanes based on poly(dimethylsiloxane): Assessment of biocompatibility. J Biomed Mater Res A 2013; 102:3951-64. [DOI: 10.1002/jbm.a.35071] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 11/29/2013] [Accepted: 12/18/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Marija V. Pergal
- Institute of Chemistry; Technology and Metallurgy, University of Belgrade; Njegoševa 12 Belgrade 11000 Serbia
| | - Jelena Nestorov
- Department of Biochemistry; Institute for Biological Research “Siniša Stanković”; University of Belgrade; 142 Despot Stefan Blvd Belgrade 11000 Serbia
| | - Gordana Tovilović
- Department of Biochemistry; Institute for Biological Research “Siniša Stanković”; University of Belgrade; 142 Despot Stefan Blvd Belgrade 11000 Serbia
| | - Sanja Ostojić
- Institute of General and Physical Chemistry; University of Belgrade; Studentski trg 12-16 Belgrade 11000 Serbia
| | - Dejan Gođevac
- Institute of Chemistry; Technology and Metallurgy, University of Belgrade; Njegoševa 12 Belgrade 11000 Serbia
| | - Dana Vasiljević-Radović
- Institute of Chemistry; Technology and Metallurgy, University of Belgrade; Njegoševa 12 Belgrade 11000 Serbia
| | - Jasna Djonlagić
- Faculty of Technology and Metallurgy; University of Belgrade; Karnegijeva 4 Belgrade 11000 Serbia
| |
Collapse
|
18
|
Mirmohammadi SA, Imani M, Uyama H, Atai M. In situ photocrosslinkable nanohybrids based on poly(ε-caprolactone fumarate)/polyhedral oligomeric silsesquioxane: synthesis and characterization. JOURNAL OF POLYMER RESEARCH 2013. [DOI: 10.1007/s10965-013-0297-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
19
|
Biomaterials-based modulation of the immune system. BIOMED RESEARCH INTERNATIONAL 2013; 2013:732182. [PMID: 24171170 PMCID: PMC3793288 DOI: 10.1155/2013/732182] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 08/19/2013] [Indexed: 01/29/2023]
Abstract
The immune system is traditionally considered from the perspective of defending against bacterial or viral infections. However, foreign materials like implants can also illicit immune responses. These immune responses are mediated by a large number of molecular signals, including cytokines, antibodies and reactive radical species, and cell types, including macrophages, neutrophils, natural killer cells, T-cells, B-cells, and dendritic cells. Most often, these molecular signals lead to the generation of fibrous encapsulation of the biomaterials, thereby shielding the body from these biomaterials. In this review we will focus on two different types of biomaterials: those that actively modulate the immune response, as seen in antigen delivery vehicles for vaccines, and those that illicit relatively small immune response, which are important for implantable materials. The first serves to actively influence the immune response by co-opting certain immune pathways, while the second tries to mimic the properties of the host in an attempt to remain undetected by the immune system. As these are two very different end points, each type of biomaterial has been studied and developed separately and in recent years, many advances have been made in each respective area, which will be highlighted in this review.
Collapse
|
20
|
de Mel A, Seifalian AM, Birchall MA. Orchestrating cell/material interactions for tissue engineering of surgical implants. Macromol Biosci 2012; 12:1010-21. [PMID: 22777725 DOI: 10.1002/mabi.201200039] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Revised: 03/25/2012] [Indexed: 12/28/2022]
Abstract
Research groups are currently recognising a critical clinical need for innovative approaches to organ failure and agenesis. Allografting, autologous reconstruction and prosthetics are hampered with severe limitations. Pertinently, readily available 'laboratory-grown' organs and implants are becoming a reality. Tissue engineering constructs vary in their design complexity depending on the specific structural and functional demands. Expeditious methods on integrating autologous stem cells onto nanoarchitectured 3D nanocomposites, are being transferred from lab to patients with a number of successful first-in-man experiences. Despite the need for a complete understanding of cell/material interactions tissue engineering is offering a plethora of exciting possibilities in regenerative medicine.
Collapse
Affiliation(s)
- Achala de Mel
- UCL Centre for Nanotechnology & Regenerative Medicine, Division of Surgery & Interventional Science, University College London, London, UK
| | | | | |
Collapse
|
21
|
Surface modification of biomaterials: a quest for blood compatibility. Int J Biomater 2012; 2012:707863. [PMID: 22693509 PMCID: PMC3368185 DOI: 10.1155/2012/707863] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Accepted: 02/22/2012] [Indexed: 02/02/2023] Open
Abstract
Cardiovascular implants must resist thrombosis and intimal hyperplasia to maintain patency. These implants when in contact with blood face a challenge to oppose the natural coagulation process that becomes activated. Surface protein adsorption and their relevant 3D confirmation greatly determine the degree of blood compatibility. A great deal of research efforts are attributed towards realising such a surface, which comprise of a range of methods on surface modification. Surface modification methods can be broadly categorized as physicochemical modifications and biological modifications. These modifications aim to modulate platelet responses directly through modulation of thrombogenic proteins or by inducing antithrombogenic biomolecules that can be biofunctionalised onto surfaces or through inducing an active endothelium. Nanotechnology is recognising a great role in such surface modification of cardiovascular implants through biofunctionalisation of polymers and peptides in nanocomposites and through nanofabrication of polymers which will pave the way for finding a closer blood match through haemostasis when developing cardiovascular implants with a greater degree of patency.
Collapse
|
22
|
Pergal MV, Antic VV, Tovilovic G, Nestorov J, Vasiljevic-Radovic D, Djonlagic J. In vitro biocompatibility evaluation of novel urethane-siloxane co-polymers based on poly(ϵ-caprolactone)-block-poly(dimethylsiloxane)-block-poly(ϵ-caprolactone). JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 23:1629-57. [PMID: 21888759 DOI: 10.1163/092050611x589338] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Novel polyurethane co-polymers (TPUs), based on poly(ϵ-caprolactone)-block-poly(dimethylsiloxane)-block-poly(ϵ-caprolactone) (PCL-PDMS-PCL) as soft segment and 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BD) as hard segment, were synthesized and evaluated for biomedical applications. The content of hard segments (HS) in the polymer chains was varied from 9 to 63 wt%. The influence of the content and length of the HS on the thermal, surface, mechanical properties and biocompatibility was investigated. The structure, composition and HS length were examined using (1)H- and quantitative (13)C-NMR spectroscopy. DSC results implied that the synthesized TPUs were semicrystalline polymers in which both the hard MDI/BD and soft PCL-PDMS-PCL segments participated. It was found that an increase in the average HS length (from 1.2 to 14.4 MDI/BD units) was accompanied by an increase in the crystallinity of the hard segments, storage moduli, hydrophilicity and degree of microphase separation of the co-polymers. Depending on the HS content, a gradual variation in surface properties of co-polymers was revealed by FT-IR, AFM and static water contact angle measurements. The in vitro biocompatibility of co-polymers was evaluated using the endothelial EA.hy926 cell line and protein adsorption on the polyurethane films. All synthesized TPUs adsorbed more albumin than fibrinogen from multicomponent protein mixture, which may indicate biocompatibility. The polyurethane films with high HS content and/or high roughness coefficient exhibit good surface properties and biocompatible behavior, which was confirmed by non-toxic effects to cells and good cell adhesion. Therefore, the non-cytotoxic chemistry of the co-polymers makes them good candidates for further development as biomedical implants.
Collapse
Affiliation(s)
- Marija V Pergal
- a Institute of Chemistry, Technology and Metallurgy, University of Belgrade , Studentski trg 12-16 , Belgrade , Serbia
| | | | | | | | | | | |
Collapse
|
23
|
Biocompatibility and antimicrobial activity of poly(3-hydroxyoctanoate) grafted with vinylimidazole. Int J Biol Macromol 2012; 50:310-6. [DOI: 10.1016/j.ijbiomac.2011.12.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Revised: 12/12/2011] [Accepted: 12/13/2011] [Indexed: 11/20/2022]
|
24
|
Ahmed M, Ghanbari H, Cousins BG, Hamilton G, Seifalian AM. Small calibre polyhedral oligomeric silsesquioxane nanocomposite cardiovascular grafts: influence of porosity on the structure, haemocompatibility and mechanical properties. Acta Biomater 2011; 7:3857-67. [PMID: 21763798 DOI: 10.1016/j.actbio.2011.06.051] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 06/24/2011] [Accepted: 06/24/2011] [Indexed: 01/09/2023]
Abstract
There is a significant worldwide demand for a small calibre vascular graft for use as a bypass or replacement conduit. An important feature in determining the success of a graft is the wall structure, which includes porosity, pore size and pore interconnectivity, as these play a crucial role in determining the long-term patency of a bypass graft. In this study we fabricate a small diameter (<5mm) vascular graft from polyhedral oligomeric silsesquioxane-poly(carbonate urea)urethane (POSS-PCU) via an extrusion, phase inversion method using an automated, custom built machine. Through the dispersion of a porogen, sodium bicarbonate (NaHCO(3)), in controlled concentrations (0-55%) we were able to produce grafts with well-defined pore morphologies. The impact of NaHCO(3) concentration on the structure of the graft wall and its influence on the mechanical and haemocompatibility properties are evaluated here. Scanning electron microscopy and mercury porosimetry were used to characterise graft structure. Atomic force microscopy elucidated any changes in surface morphology. The addition of NaHCO(3) improved the pore interconnectivity and increasing the concentration of NaHCO(3) led to grafts with rougher surfaces and larger pore sizes. The ultimate tensile strength and suture retention decreased with increasing concentrations of NaHCO(3), while graft compliance increased. To evaluate haemocompatibility platelets and peripheral blood mononuclear cells (PBMC) were incubated on a range of different graft samples. Platelet adhesion, PBMC surface receptor expression (CD14, CD86, CD69 and HLA-DR) and cytokine release (PF4, IL-1β, IL-6, IL-10, TNFα) were all measured. Increasing numbers of platelets adhered to grafts produced with no NaHCO(3), which exhibited a smooth surface morphology, and PBMC adherent on these grafts expressed higher levels of CD14 and CD86. Whilst the different graft samples induced varying levels of cytokine secretion in vitro, no distinct pattern suggesting a non-trivial relationship was observed.
Collapse
|
25
|
Szott LM, Horbett TA. Protein interactions with surfaces: cellular responses, complement activation, and newer methods. Curr Opin Chem Biol 2011; 15:677-82. [DOI: 10.1016/j.cbpa.2011.04.021] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Accepted: 04/07/2011] [Indexed: 10/18/2022]
|
26
|
Zavyalova EG, Protopopova AD, Kopylov AM, Yaminsky IV. Investigation of early stages of fibrin association. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4922-4927. [PMID: 21428306 DOI: 10.1021/la200148n] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Interactions between fibrinogen molecules proteolytically cleaved with thrombin were investigated using atomic force microscopy (AFM) and dynamic light scattering (DLS). Gradually decreased fibrinogen concentrations were used to study the fibrin network, large separated fibrils, small fibrils in the initial association stages, and protofibrils. In addition, a new type of structure was found in AFM experiments at a low fibrinogen concentration (20 nM): the molecules in these single-stranded associates are arranged in a row, one after the other. The height, diameter, and distance between domains in these single-stranded associates were the same as those in the original fibrinogen molecules. DLS data assumed formation of extended associates in bulk solution at fibrinogen concentration as low as 20 nM.
Collapse
Affiliation(s)
- Elena G Zavyalova
- Chemistry Department, M. V. Lomonosov Moscow State University, Leninskie gory 1-3, Moscow, 119991 Russian Federation.
| | | | | | | |
Collapse
|
27
|
Giamblanco N, Yaseen M, Zhavnerko G, Lu JR, Marletta G. Fibronectin conformation switch induced by coadsorption with human serum albumin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:312-319. [PMID: 21141946 DOI: 10.1021/la104127q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The dynamic adsorption of human serum albumin (HSA) and plasma fibronectin (Fn) onto hydrophobic poly(hydroxymethylsiloxane) (PHMS) and the structures of adsorbed protein layers from single and binary protein solutions were studied. Spectroscopic ellipsometry (SE) and quartz crystal microbalance with dissipation monitoring (QCM-D) together with atomic force microscopy (AFM) were used to measure the effective mass, thickness, viscoelastic properties, and morphology of the adsorbed protein films. Adsorbed HSA formed a rigid, tightly bound monolayer of deformed protein, and Fn adsorption yielded a thick, very viscoelastic layer that was firmly bound to the substrate. The mixed protein layers obtained from the coadsorption of binary equimolecular HSA-Fn solutions were found to be almost exclusively dominated by Fn molecules. Further sequential adsorption experiments showed little evidence of HSA adsorbed onto the predeposited Fn layer (denoted as Fn ≫ HSA), and Fn was not adsorbed onto predeposited HSA (HSA ≫ Fn). The conformational arrangement of the adsorbed Fn was analyzed in terms of the relative availability of two Fn domains. In particular, (4)F(1)·(5)F(1) binding domains in the Hep I fragment, close to the amino terminal of Fn, were targeted using a polyclonal antifibronectin antibody (anti-Fn), and the RGD sequence in the 10th segment, in the central region of the molecule, was tested by cell culture experiments. The results suggested that coadsorption with HSA induced the Fn switch from an open conformation, with the amino terminal subunit oriented toward the solution, to a close conformation, with the Fn central region oriented toward the solution.
Collapse
Affiliation(s)
- Nicoletta Giamblanco
- Laboratory for Molecular Surfaces and Nanotechnology, Dipartimento di Scienze Chimiche, Università di Catania and CSGI, Viale A. Doria 6, 95125 Catania, Italy
| | | | | | | | | |
Collapse
|
28
|
Ghanbari H, Marashi SM, Rafiei Y, Chaloupka K, Seifalian AM. Biomedical Application of Polyhedral Oligomeric Silsesquioxane Nanoparticles. ADVANCES IN SILICON SCIENCE 2011. [DOI: 10.1007/978-90-481-3787-9_9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|