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Jana S, Datta P, Das H, Jaiswal S, Ghosh PR, Lahiri D, Kundu B, Nandi SK. Copper and cobalt doped bioactive glass-fish dermal collagen electrospun mat triggers key events of diabetic wound healing in full-thickness skin defect model. J Mech Behav Biomed Mater 2022; 134:105414. [PMID: 36037706 DOI: 10.1016/j.jmbbm.2022.105414] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 08/03/2022] [Accepted: 08/07/2022] [Indexed: 10/15/2022]
Abstract
The wounds arising out of underlying hyperglycemic conditions such as diabetic foot ulcers demand a multifunctional tissue regeneration approach owing to several deficiencies in the healing mechanisms. Herein, four different types of electrospun microfibers by combining Rohu fish skin-derived collagen (Fcol) with a bioactive glass (BAG)/ion-doped bioactive glass, namely, Fcol/BAG, Fcol/CuBAG, Fcol/CoBAG, and Fcol/CuCoBAG was developed to accelerate wound healing through stimulation of key events such as angiogenesis and ECM re-construction under diabetic conditions. SEM analysis shows the porous and microfibrous architecture, while the EDX mapping provides evidence of the incorporation of dopants inside various inorganic-organic composite mats. The viscoelastic properties of the microfibrous mats as measured by a nano-DMA test show a higher damping factor non-uniform tan-delta value. The maximum ultimate tensile strength and toughness are recorded for fish collagen with copper doped bioactive glass microfibers while the least values are demonstrated by microfibers with cobalt dopant. In vitro results demonstrate excellent cell-cell and cell-material interactions when human dermal fibroblasts (HDFs) were cultured over the microfibers for 48 h. When these mats were applied over full-thickness diabetic wounds in the rabbit model, early wound healing is attained with Fcol/CuBAG, Fcol/CoBAG, and Fcol/CuCoBAG microfibers. Notably, these microfibers-treated wounds demonstrate a significantly (p < 0.01) higher density of blood vessels by CD-31 immunostaining than control, Duoderm, and Fcol/BAG treated wounds. Mature collagen deposition and excellent ECM remodeling are also evident in wounds treated with fish collagen/ion-doped bioactive glass microfibers suggesting their positive role in diabetic wound healing.
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Affiliation(s)
- Sonali Jana
- Department of Veterinary Physiology, West Bengal University of Animal and Fishery Sciences, Kolkata, India
| | - Pradyot Datta
- Bioceramics and Coating Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, India
| | - Himanka Das
- Bioceramics and Coating Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, India
| | - Satish Jaiswal
- Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, India
| | - Prabal Ranjan Ghosh
- Department of Veterinary Physiology, West Bengal University of Animal and Fishery Sciences, Kolkata, India
| | - Debrupa Lahiri
- Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, India
| | - Biswanath Kundu
- Bioceramics and Coating Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, India.
| | - Samit Kumar Nandi
- Department of Veterinary Surgery and Radiology, West Bengal University of Animal and Fishery Sciences, Kolkata, India.
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Wang P, Sun Y, Shi X, Shen H, Ning H, Liu H. Bioscaffolds embedded with regulatory modules for cell growth and tissue formation: A review. Bioact Mater 2021; 6:1283-1307. [PMID: 33251379 PMCID: PMC7662879 DOI: 10.1016/j.bioactmat.2020.10.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 10/07/2020] [Accepted: 10/21/2020] [Indexed: 02/06/2023] Open
Abstract
The demand for artificial organs has greatly increased because of various aging-associated diseases and the wide need for organ transplants. A recent trend in tissue engineering is the precise reconstruction of tissues by the growth of cells adhering to bioscaffolds, which are three-dimensional (3D) structures that guide tissue and organ formation. Bioscaffolds used to fabricate bionic tissues should be able to not only guide cell growth but also regulate cell behaviors. Common regulation methods include biophysical and biochemical stimulations. Biophysical stimulation cues include matrix hardness, external stress and strain, surface topology, and electromagnetic field and concentration, whereas biochemical stimulation cues include growth factors, proteins, kinases, and magnetic nanoparticles. This review discusses bioink preparation, 3D bioprinting (including extrusion-based, inkjet, and ultraviolet-assisted 3D bioprinting), and regulation of cell behaviors. In particular, it provides an overview of state-of-the-art methods and devices for regulating cell growth and tissue formation and the effects of biophysical and biochemical stimulations on cell behaviors. In addition, the fabrication of bioscaffolds embedded with regulatory modules for biomimetic tissue preparation is explained. Finally, challenges in cell growth regulation and future research directions are presented.
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Affiliation(s)
- Pengju Wang
- Department of Mechanical Manufacturing and Automation, School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Yazhou Sun
- Department of Mechanical Manufacturing and Automation, School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Xiaoquan Shi
- Department of Mechanical Manufacturing and Automation, School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Huixing Shen
- Department of Mechanical Manufacturing and Automation, School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Haohao Ning
- Department of Mechanical Manufacturing and Automation, School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Haitao Liu
- Department of Mechanical Manufacturing and Automation, School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
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RAD51B (rs8017304 and rs2588809), TRIB1 (rs6987702, rs4351379, and rs4351376), COL8A1 (rs13095226), and COL10A1 (rs1064583) Gene Variants with Predisposition to Age-Related Macular Degeneration. DISEASE MARKERS 2019; 2019:5631083. [PMID: 31191752 PMCID: PMC6525907 DOI: 10.1155/2019/5631083] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 03/27/2019] [Indexed: 12/16/2022]
Abstract
Background Age-related macular degeneration (AMD) is a progressive neurodegenerative disease of a central part of the neural retina (macula) and a leading cause of blindness in elderly people. While it is known that the AMD is a multifactorial disease, genetic factors involved in lipid metabolism, inflammation, and neovascularization are currently being widely studied in genome-wide association studies (GWAS). The aim of our study was to evaluate the impact of new single nucleotide polymorphisms (SNPs) in RAD51B, TRIB1, COL8A1, and COL10A1 genes on AMD development. Methods Case-control study involved 254 patients diagnosed with early AMD, 244 patients with exudative AMD, and 942 control subjects. The genotyping of RAD51B (rs8017304 and rs2588809), TRIB1 (rs6987702, rs4351379, and rs4351376), COL8A1 (rs13095226), and COL10A1 (rs1064583) was carried out using TaqMan assays by a real-time polymerase chain reaction (RT-PCR) method. Results Statistically significant difference was found in genotype (TT, TC, and CC) distribution of COL8A1 rs13095226 between exudative AMD and control groups (60.2%, 33.6%, and 6.1% vs. 64.9%, 32.3%, and 2.9%, respectively, p = 0.036). Also, comparing with TT+TC, rs13095226 CC genotype was associated with 3.5-fold increased odds of exudative AMD development (OR = 3.540; 95% CI: 1.415-8.856; p = 0.007). Conclusion Our study revealed a strong association between a variant in COL8A1 (rs13095226) and exudative AMD development.
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Tang J, Chen J, Guo J, Wei Q, Fan H. Construction and evaluation of fibrillar composite hydrogel of collagen/konjac glucomannan for potential biomedical applications. Regen Biomater 2018; 5:239-250. [PMID: 30094063 PMCID: PMC6077832 DOI: 10.1093/rb/rby018] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 06/06/2018] [Accepted: 06/21/2018] [Indexed: 12/12/2022] Open
Abstract
Konjac glucomannan (KGM) is recognized as a safe material for its health-promoting benefits and thus widely used in various fields including pharmaceutical industry. In recent decades, the combination of collagen and KGM attracts more attentions for biomedical purpose, especially the hybrid films of collagen–KGM or collagen–KGM–polysaccharide. In this study, to further and deeply develop the intrinsic values of both collagen and KGM as biomaterials, a novel kind of composite hydrogel comprising collagen and KGM at a certain ratio was fabricated under mild conditions via fibrillogenesis process of the aqueous blends of collagen and KGM that experienced deacetylation simultaneously. The chemical composition, microcosmic architectures, swelling behavior, biodegradation and dynamic mechanic properties of such resulted composite hydrogels were systematically investigated. Biologic experiments, including cell culture in vitro and hypodermic implantation in vivo, were also conducted on these collagen/KGM composite hydrogels to evaluate their biologic performances. The relevant results prove that, based on collagen self-assembly behavior, this synthesis strategy is efficient to construct a composite hydrogel of collagen/KGM with improved mechanical properties, biodegradability, excellent biocompatibility and bioactivity, which are promising for potential biomedical applications such as tissue engineering and regenerative medicine.
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Affiliation(s)
- Jiayuan Tang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P.R. China
| | - Jinlin Chen
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P.R. China
| | - Jing Guo
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P.R. China
| | - Qingrong Wei
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P.R. China
| | - Hongsong Fan
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P.R. China
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Y. Rioja A, Muniz-Maisonet M, J. Koob T, D. Gallant N. Effect of nordihydroguaiaretic acid cross-linking on fibrillar collagen: in vitro evaluation of fibroblast adhesion strength and migration. AIMS BIOENGINEERING 2017. [DOI: 10.3934/bioeng.2017.2.300] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Wang F, Wang M, She Z, Fan K, Xu C, Chu B, Chen C, Shi S, Tan R. Collagen/chitosan based two-compartment and bi-functional dermal scaffolds for skin regeneration. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 52:155-62. [PMID: 25953553 DOI: 10.1016/j.msec.2015.03.013] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Revised: 01/26/2015] [Accepted: 03/09/2015] [Indexed: 01/03/2023]
Abstract
Inspired from the sophisticated bilayer structures of natural dermis, here, we reported collagen/chitosan based two-compartment and bi-functional dermal scaffolds. Two functions refer to mediating rapid angiogenesis based on recombinant human vascular endothelial growth factor (rhVEGF) and antibacterial from gentamicin, which were encapsulated in PLGA microspheres. The gentamicin and rhVEGF encapsulated PLGA microspheres were further combined with collagen/chitosan mixtures in low (lower layer) and high (upper layer) concentrations, and molded to generate the two-compartment and bi-functional scaffolds. Based on morphology and pore structure analyses, it was found that the scaffold has a distinct double layered porous and connective structure with PLGA microspheres encapsulated. Statistical analysis indicated that the pores in the upper layer and in the lower layer have great variations in diameter, indicative of a two-compartment structure. The release profiles of gentamicin and rhVEGF exceeded 28 and 49 days, respectively. In vitro culture of mouse fibroblasts showed that the scaffold can facilitate cell adhesion and proliferation. Moreover, the scaffold can obviously inhibit proliferation of Staphylococcus aureus and Serratia marcescens, exhibiting its unique antibacterial effect. The two-compartment and bi-functional dermal scaffolds can be a promising candidate for skin regeneration.
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Affiliation(s)
- Feng Wang
- Department of Plastic Surgery and Burns, Shenzhen Second People's Hospital, Shenzhen 518035, PR China
| | - Mingbo Wang
- Key Laboratory of Biomedical Materials and Implants, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, PR China
| | - Zhending She
- Key Laboratory of Biomedical Materials and Implants, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, PR China; Shenzhen Lando Biomaterials Co., Ltd., Shenzhen 518057, PR China
| | - Kunwu Fan
- Department of Plastic Surgery and Burns, Shenzhen Second People's Hospital, Shenzhen 518035, PR China
| | - Cheng Xu
- Department of Plastic Surgery and Burns, Shenzhen Second People's Hospital, Shenzhen 518035, PR China
| | - Bin Chu
- Key Laboratory of Biomedical Materials and Implants, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, PR China
| | - Changsheng Chen
- Key Laboratory of Biomedical Materials and Implants, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, PR China
| | - Shengjun Shi
- The Burns Department of Zhujiang Hospital, Southern Medical University, Guangzhou 510280, PR China.
| | - Rongwei Tan
- Key Laboratory of Biomedical Materials and Implants, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, PR China; Shenzhen Lando Biomaterials Co., Ltd., Shenzhen 518057, PR China.
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Sorkio AE, Vuorimaa-Laukkanen EP, Hakola HM, Liang H, Ujula TA, Valle-Delgado JJ, Österberg M, Yliperttula ML, Skottman H. Biomimetic collagen I and IV double layer Langmuir-Schaefer films as microenvironment for human pluripotent stem cell derived retinal pigment epithelial cells. Biomaterials 2015; 51:257-269. [PMID: 25771016 DOI: 10.1016/j.biomaterials.2015.02.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 01/26/2015] [Accepted: 02/01/2015] [Indexed: 12/11/2022]
Abstract
The environmental cues received by the cells from synthetic substrates in vitro are very different from those they receive in vivo. In this study, we applied the Langmuir-Schaefer (LS) deposition, a variant of Langmuir-Blodgett technique, to fabricate a biomimetic microenvironment mimicking the structure and organization of native Bruch's membrane for the production of the functional human embryonic stem cell derived retinal pigment epithelial (hESC-RPE) cells. Surface pressure-area isotherms were measured simultaneously with Brewster angle microscopy to investigate the self-assembly of human collagens type I and IV on air-subphase interface. Furthermore, the structure of the prepared collagen LS films was characterized with scanning electron microscopy, atomic force microscopy, surface plasmon resonance measurements and immunofluorescent staining. The integrity of hESC-RPE on double layer LS films was investigated by measuring transepithelial resistance and permeability of small molecular weight substance. Maturation and functionality of hESC-RPE cells on double layer collagen LS films was further assessed by RPE-specific gene and protein expression, growth factor secretion, and phagocytic activity. Here, we demonstrated that the prepared collagen LS films have layered structure with oriented fibers corresponding to architecture of the uppermost layers of Bruch's membrane and result in increased barrier properties and functionality of hESC-RPE cells as compared to the commonly used dip-coated controls.
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Affiliation(s)
- Anni E Sorkio
- BioMediTech, University of Tampere FM5/BMT, 33014 University of Tampere, Finland.
| | - Elina P Vuorimaa-Laukkanen
- Department of Chemistry and Bioengineering, Tampere University of Technology, Korkeakoulunkatu 8, 33720 Tampere, Finland
| | - Hanna M Hakola
- Department of Chemistry and Bioengineering, Tampere University of Technology, Korkeakoulunkatu 8, 33720 Tampere, Finland
| | - Huamin Liang
- Department of Chemistry and Bioengineering, Tampere University of Technology, Korkeakoulunkatu 8, 33720 Tampere, Finland
| | - Tiina A Ujula
- Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, 00076 Aalto, Finland
| | - Juan José Valle-Delgado
- Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, 00076 Aalto, Finland
| | - Monika Österberg
- Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, 00076 Aalto, Finland
| | - Marjo L Yliperttula
- Division of Biopharmaceutical Sciences, Centre for Drug Research, Faculty of Pharmacy, University of Helsinki, Viikinkaari 5, 00790 Helsinki, Finland
| | - Heli Skottman
- BioMediTech, University of Tampere FM5/BMT, 33014 University of Tampere, Finland
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Grohmann J, Taetzner S, Theuss T, Kuehnel F, Buchwald U, Einspanier A. The conclusiveness of less-invasive imaging techniques (computer tomography, X-ray) with regard to their identification of bone diseases in a primate model (Callithrix jacchus). J Med Primatol 2012; 41:130-7. [PMID: 22300635 DOI: 10.1111/j.1600-0684.2011.00531.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Although common marmosets seem to be appropriate animal models to examine bone diseases, no data about the conclusiveness of less-invasive techniques are available. Therefore, the aim was to combine different techniques to analyse changes in bone metabolism of common marmosets with bone diseases. METHODS Five monkeys were examined by X-ray, computer tomography (CT), histology and immunohistochemistry (IHC). RESULTS Monkeys with lowest bone mineral density (BMD) showed increased bone marrow, decreased cancellous bone and decreased contrast in X-ray. Highest alkaline phosphatase (AP)-levels were detected in bones with low elastic modulus. Expression of osteopontin (OPN), osteocalcin (OC) and runt-related transcriptions factor 2 (RUNX 2) was detected in bones with high modulus. No expression was present in bones with lower modulus. Collagen type I and V were found in every bone. CONCLUSIONS In conclusion, CT, X-ray and AP are useful techniques to detect bone diseases in common marmosets. These observations could be confirmed by IHC.
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Affiliation(s)
- J Grohmann
- Institute of Physiological Chemistry, University of Leipzig, Leipzig, Germany.
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Titushkin I, Sun S, Cho M. Structure and Biology of the Cellular Environment: The Extracellular Matrix. NANOTECHNOLOGY FOR BIOLOGY AND MEDICINE 2012. [DOI: 10.1007/978-0-387-31296-5_1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Surface characteristics and biological studies of hydroxyapatite coating by a new method. J Biomed Mater Res B Appl Biomater 2011; 98:395-407. [DOI: 10.1002/jbm.b.31864] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Revised: 03/26/2011] [Accepted: 03/30/2011] [Indexed: 11/07/2022]
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Toksoz S, Mammadov R, Tekinay AB, Guler MO. Electrostatic effects on nanofiber formation of self-assembling peptide amphiphiles. J Colloid Interface Sci 2011; 356:131-7. [DOI: 10.1016/j.jcis.2010.12.076] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2010] [Revised: 12/24/2010] [Accepted: 12/27/2010] [Indexed: 11/12/2022]
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Sang L, Luo D, Xu S, Wang X, Li X. Fabrication and evaluation of biomimetic scaffolds by using collagen–alginate fibrillar gels for potential tissue engineering applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2011. [DOI: 10.1016/j.msec.2010.09.008] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Groh A, Wagner M. Biased three-dimensional cell migration and collagen matrix modification. Math Biosci 2011; 231:105-19. [PMID: 21354184 DOI: 10.1016/j.mbs.2011.02.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2010] [Revised: 10/15/2010] [Accepted: 02/18/2011] [Indexed: 11/28/2022]
Abstract
Various tumours can be resected even for cure with complete removal. Surgical excision with a wide margin to ensure complete removal has therefore been suggested as the primary treatment for such lesions. The histological examination of the three-dimensional (3D) excision margins (3D histology) constitutes an important part of the quality control mechanisms in tumour surgery. Understanding histologically relevant properties of the constituents of the microenvironment in tumours and the circumferential portion of non-lesional tissue is therefore critical. Accompanied by the increasing availability of high performance computers in recent decades, there has been a strong movement aiming at the development of mathematical models whose implementations allow in silico simulations of biological reaction networks. Due to its relevance in numerous biological and pathological processes, there have been various attempts to model biased migration of single cells. The model introduced in this paper plays a prominent role insofar as it covers the under-represented 3D case. Moreover, it is uniformly formulated for both two and three dimensions. The velocity of each cell is characterised by a generalised Langevin equation, a stochastic differential equation, where chemotaxis as well as contact guidance are considered to simulate selected aspects of interactions between carcinoma cell groups and fibroblast-like cells. Algorithmic and numeric aspects of the developed equations are detailed in this paper and the results of the simulations are illustrated in different manners to emphasise specific features. A simple test scenario as well as a geometry based on segmentation data of a real histological slide has served for verification of the software. The resulting morphologies closely resemble that of desmoplastic stromal reaction readily identifiable in histological slides of infiltrating carcinoma, and the images can be interpreted in the context of 3D histology.
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Affiliation(s)
- A Groh
- Saarland University, Faculty 6 - Mathematics and Computer Science, POB 151150, 66041 Saarbrücken, Germany.
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Saralidze K, Knetsch MLW, van der Marel C, Koole LH. Versatile Polymer Microspheres for Injection Therapy: Aspects of Fluoroscopic Traceability and Biofunctionalization. Biomacromolecules 2010; 11:3556-62. [DOI: 10.1021/bm1010273] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ketie Saralidze
- Department of Biomedical Engineering/Biomaterials Sciences, Faculty of Health, Medicine, and Life Sciences, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands, and Department of Surface and Thin Film Analysis, Mi Plaza Materials Analysis, Philips Research, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
| | - Menno L. W. Knetsch
- Department of Biomedical Engineering/Biomaterials Sciences, Faculty of Health, Medicine, and Life Sciences, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands, and Department of Surface and Thin Film Analysis, Mi Plaza Materials Analysis, Philips Research, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
| | - Cees van der Marel
- Department of Biomedical Engineering/Biomaterials Sciences, Faculty of Health, Medicine, and Life Sciences, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands, and Department of Surface and Thin Film Analysis, Mi Plaza Materials Analysis, Philips Research, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
| | - Leo H. Koole
- Department of Biomedical Engineering/Biomaterials Sciences, Faculty of Health, Medicine, and Life Sciences, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands, and Department of Surface and Thin Film Analysis, Mi Plaza Materials Analysis, Philips Research, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
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Kadirvel R, Ding YH, Dai D, Lewis DA, Kallmes DF. Differential gene expression in well-healed and poorly healed experimental aneurysms after coil treatment. Radiology 2010; 257:418-26. [PMID: 20829543 DOI: 10.1148/radiol.10100362] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE To compare gene expression patterns between well-healed and poorly healed aneurysms following coil embolization in a rabbit model. MATERIALS AND METHODS The Institutional Animal Care and Use Committee approved all procedures before initiation of the study. Elastase-induced, saccular aneurysms were created in rabbits and embolized by using platinum microcoils. Group 1 aneurysms were densely packed (volumetric packing density, >30%) to achieve good healing, whereas group 2 aneurysms were loosely packed (volumetric packing density, <20%), which yields poor healing. At 2 or 4 weeks after implantation, samples were harvested. RNA was isolated separately from the necks and domes of the aneurysms and analyzed by using a microarray containing 294 rabbit genes. Genes with significant differences between groups (P < .05; false discovery rate, <0.1; fold change, ≥1.2 and ≤0.8) were considered differentially expressed. RESULTS At 2 weeks, of 294 genes, 22 (7.5%) genes in the neck and 14 (4.8%) genes in the dome were differentially expressed between groups; at 4 weeks, of 294 genes, 25 (8.5%) genes in the neck and 17 (5.8%) genes in the dome were differentially expressed between groups. Genes overexpressed in group 1 as compared with group 2 aneurysms included those encoding proteases, adhesion molecules, and chemoattractant molecules. Conversely, group 2 aneurysms had increased expression of genes encoding structural molecules, including collagens, as compared with expression in group 1 aneurysms. CONCLUSION Robust healing after coil embolization is associated with substantial biological activity, as evidenced by overexpression of proteases, adhesion molecules, and chemoattractants. However, contrary to prior hypotheses, structural molecules such as collagen were not associated with the healing response in the rabbit model.
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Affiliation(s)
- Ramanathan Kadirvel
- Department of Radiology, Neuroradiology Research Laboratory, Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA
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Goffin AJJ, Rajadas J, Fuller GG. Interfacial flow processing of collagen. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:3514-3521. [PMID: 20000428 DOI: 10.1021/la9031317] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A new method for creating substrates made out of ordered collagen fibers, on which cells in culture can align, is proposed. The substrates can be used for research in cell culture, and this research presents a significant advance in the technology to coat implants in order to improve cell adhesion. In the procedure presented here, a molecular solution of collagen is spread at the interface of a saline solution and air to induce fiber formation, compressed at a high speed to induce orientation and deposited on solid substrates via Langmuir-Blodgett transfer. Several interfacial techniques are employed to investigate the behavior of collagen, which is shown to be dependent on the salt concentration of the subphase as well as the temperature. After Langmuir-Blodgett transfer, primary human fibroblasts and adipose-derived stem cells are cultured on the collagen substrates. Both types of cells respond favorably to the collagen orientation and align with the deposited fibers. The technique presented here provides a simple method to produce well-controlled, oriented collagen substrates that can be used in tissue culture research or scaffolding applications without the use of additives and/or bioincompatible materials.
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Affiliation(s)
- An J J Goffin
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA
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Groh A, Louis AK. Stochastic modelling of biased cell migration and collagen matrix modification. J Math Biol 2009; 61:617-47. [PMID: 20012047 DOI: 10.1007/s00285-009-0314-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2009] [Revised: 11/09/2009] [Indexed: 10/20/2022]
Abstract
Matrix dynamics plays a crucial role in several physiological and pathological processes. In this paper we develop a model framework, which describes the temporal fibre network evolution depending on the influence of migrating fibroblasts. The cells are regarded as discrete objects in the plane, whose velocities are determined by a generalised Langevin equation. For its solution we verify existence and uniqueness. The courses of the trajectories are affected by two external impulses, chemotaxis and contact guidance, respectively. The extracellular matrix is described by a continuous vector field which contains both information on density and orientation of the fibrous material. Modelling dynamic interaction between the discrete and the continuum variables is an essential point of this paper. In particular, the smoothing of the fluctuating paths plays a key role. Besides a detailed description of the formulated equations, we also supply the condensed pseudo code of the algorithm. We investigate several examples and present results both from artificial and real data.
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Affiliation(s)
- Andreas Groh
- Fakultät für Mathematik und Informatik, Postfach 151150, 66041, Saarbrücken, Germany.
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Gu C, Zheng R, Yang Z, Wen A, Wu H, Zhang H, Yi D. Novel glycidyl methacrylated dextran/gelatin nanoparticles loaded with basic fibroblast growth factor: formulation and characteristics. Drug Dev Ind Pharm 2009; 35:1419-29. [DOI: 10.3109/03639040902988558] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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19
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Rice MA, Homier PM, Waters KR, Anseth KS. Effects of directed gel degradation and collagenase digestion on the integration of neocartilage produced by chondrocytes encapsulated in hydrogel carriers. J Tissue Eng Regen Med 2008; 2:418-29. [DOI: 10.1002/term.113] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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20
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Zippel R, Wilhelm L, Hoene A, Walschus U, Ueberrueck T, Schlosser M. Local tissue reaction and differentiation of the prosthesis-specific antibody response following functional implantation of vascular grafts in pigs. J Biomed Mater Res B Appl Biomater 2008; 85:334-42. [DOI: 10.1002/jbm.b.30951] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mazzocca AD, McCarthy MB, Arciero C, Jhaveri A, Obopilwe E, Rincon L, Wyman J, Gronowicz GA, Arciero RA. Tendon and bone responses to a collagen-coated suture material. J Shoulder Elbow Surg 2007; 16:S222-30. [PMID: 17448699 DOI: 10.1016/j.jse.2007.02.113] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2006] [Revised: 01/10/2007] [Accepted: 02/05/2007] [Indexed: 02/01/2023]
Abstract
Tendon to bone integration after rotator cuff repair is not a reproducible process. During repair, bioabsorbable and nonabsorbable suture material is universally used to facilitate the procedure. Improving the biological architecture of inert suture might aid in overall tendon to bone healing. The objective of our study is to enhance the bone to tendon union by absorbing type I collagen onto high strength nonabsorbable polyester/polyethylene suture commonly used in rotator cuff surgery. Our purpose was to evaluate the tendon and bone cellular response to this novel coated suture compared to uncoated suture. Primary human osteoblasts (HOBs) and tenocytes were plated onto polyester/polyethylene suture that was either uncoated or coated with type I bovine collagen. Cell adhesion to the sutures was assayed at 24 hours. Proliferation was determined at 48 hours by measuring [3H]- Thymidine incorporation in cells attached to the sutures. At 24 and 48 hours, respectively, cells grown on the collagen-coated suture showed a significantly greater response measured by adhesion and proliferation than cells grown on uncoated suture. At five days of culture, alkaline phosphatase activity and protein synthesis was significantly greater on the collagen-coated suture compared to uncoated. Collagen-coated polyester/polyethylene suture appears to stimulate adhesion, proliferation alkaline phosphatase, and protein synthesis more than uncoated sutures, and therefore may aid in the tendon to bone incorporation process critical to rotator cuff repair.
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Affiliation(s)
- Augustus D Mazzocca
- Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT 06031, USA.
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Machado CB, Ventura JMG, Lemos AF, Ferreira JMF, Leite MF, Goes AM. 3D chitosan-gelatin-chondroitin porous scaffold improves osteogenic differentiation of mesenchymal stem cells. Biomed Mater 2007; 2:124-31. [PMID: 18458445 DOI: 10.1088/1748-6041/2/2/010] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A porous 3D scaffold was developed to support and enhance the differentiation process of mesenchymal stem cells (MSC) into osteoblasts in vitro. The 3D scaffold was made with chitosan, gelatin and chondroitin and it was crosslinked by EDAC. The scaffold physicochemical properties were evaluated. SEM revealed the high porosity and interconnection of pores in the scaffold; rheological measurements show that the scaffold exhibits a characteristic behavior of strong gels. The elastic modulus found in compressive tests of the crosslinked scaffold was about 50 times higher than the non-crosslinked one. After 21 days, the 3D matrix submitted to hydrolytic degradation loses above 40% of its weight. MSC were collected from rat bone marrow and seeded in chitosan-gelatin-chondroitin 3D scaffolds and in 2D culture plates as well. MSC were differentiated into osteoblasts for 21 days. Cell proliferation and alkaline phosphatase activity were followed weekly during the osteogenic process. The osteogenic differentiation of MSC was improved in 3D culture as shown by MTT assay and alkaline phosphatase activity. On the 21st day, bone markers, osteopontin and osteocalcin, were detected by the PCR analysis. This study shows that the chitosan-gelatin-chondroitin 3D structure provides a good environment for the osteogenic process and enhances cellular proliferation.
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Affiliation(s)
- C B Machado
- Department of Biochemistry and Immunology, Institute of Biological Sciences, Federal University of Minas Gerais, Brazil
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Saralidze K, Knetsch MLW, van Hooy-Corstjens CSJ, Koole LH. Radio-Opaque and Surface-Functionalized Polymer Microparticles: Potentially Safer Biomaterials for Different Injection Therapies. Biomacromolecules 2006; 7:2991-6. [PMID: 17096523 DOI: 10.1021/bm0603903] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Injectable polymer particles with a diameter in the range of 30-300 microm find applications as a biomaterial in different clinical fields, such as cosmetic surgery, reconstructive surgery, and urology. However, clinical effects tend to disappear after several months, either due to migration of the particles away from the injection site (caused by weak adherence with the surrounding soft tissues) or due to fibrosis (caused by excessive encapsulation of the particles by fibrous tissue). Little is known about the fate of injected microparticles, due to the fact that they are extremely difficult to trace in a noninvasive manner. Design, synthesis, and characterization of new polymeric microspheres with two additional features that can enhance safety and can help to overcome drawbacks of existing products are reported. First, the new microparticles feature clear radio-opacity (X-ray visibility) as they are prepared on the basis of a reactive methacrylic monomer that contains covalently bound iodine. Model experiments reveal that the level of X-ray contrast is sufficient for clinical monitoring; they can be visualized both during the injection and afterward. The particles feature excellent cytocompatibility in vitro and in vivo. Second, a method is explored to functionalize the surface of the particles, for example, through immobilization of collagen. Other extracellular matrix proteins can also be immobilized, and this provides a mechanism to control anchoring of the particles in soft tissue. The results are briefly discussed in the context of improved biomaterials, contemporary X-ray imaging, and control over biomaterial-soft tissue interactions in vivo.
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Affiliation(s)
- Ketie Saralidze
- Contribution from the Center for Biomaterials Research, University of Maastricht, PO Box 616, 6200 MD Maastricht, The Netherlands
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Moreira PL, An YH, Santos AR, Genari SC. In vitro analysis of anionic collagen scaffolds for bone repair. ACTA ACUST UNITED AC 2004; 71:229-37. [PMID: 15386402 DOI: 10.1002/jbm.b.30026] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Collagen has been extensively described as a beneficial material in bone tissue engineering due to its biocompatibility, biodegradability, low antigenicity, and high tensile strength. However, collagen scaffolds in their pure form have some drawbacks and improvements in the physical, chemical, and biologic properties of collagen are necessary to overcome those inadequacies. Recently, the selective hydrolysis of carboxyamides of asparagine and glutamine residues of collagen has been employed to increase the number of negative sites and enhance the piezoelectric properties of collagen. Anionic collagen scaffolds were prepared by use of a hydrolysis treatment for either 24 h [bovine pericardium (BP 24)] or 48 h (BP 48). Bovine osteoblasts were cultured on them and on native matrices to understand the cellular interactions responsible for the good osteoconductivity and biocompatibility reported with in vivo tests. Based on the data obtained on cell adhesion, alkaline phosphatase (ALP) and extracellular matrix macromolecule production, and cellular proliferation through histological analysis, we may conclude that the materials tested reveal sufficient biocompatibility level for bone repair. Further, the evidence of some connection between ALP activity and the mineralization process should be emphasized. BP 48 presented the most promising results stimulating in vitro mineralization, ALP production, and possible osteoblast differentiation.
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Affiliation(s)
- Patricia L Moreira
- Department of Cellular Biology, State University of Campinas, PO Box 6109, São Paulo 13084-971, Brazil.
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Reyes CD, García AJ. Engineering integrin-specific surfaces with a triple-helical collagen-mimetic peptide. J Biomed Mater Res A 2003; 65:511-23. [PMID: 12761842 DOI: 10.1002/jbm.a.10550] [Citation(s) in RCA: 155] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Integrin-mediated cell adhesion to extracellular matrix proteins anchors cells and triggers signals that direct cell function. The integrin alpha(2)beta(1) recognizes the glycine-phenylalanine-hydroxyproline-glycine-glutamate-arginine (GFOGER) motif in residues 502-507 of the alpha(1)(I) chain of type I collagen. Integrin recognition is entirely dependent on the triple-helical conformation of the ligand similar to that of native collagen. This study focuses on engineering alpha(2)beta(1)-specific bioadhesive surfaces by immobilizing a triple-helical collagen-mimetic peptide incorporating the GFOGER binding sequence onto model nonadhesive substrates. Circular dichroism spectroscopy verified that this peptide adopts a stable triple-helical conformation in solution. Passively adsorbed GFOGER-peptide exhibited dose-dependent HT1080 cell adhesion and spreading comparable to that observed on type I collagen. Subsequent antibody blocking conditions verified the involvement of integrin alpha(2)beta(1) in these adhesion events. Focal adhesion formation was observed by immunofluorescent staining for alpha(2)beta(1) and vinculin on MC3T3-E1 cells. Model functionalized surfaces then were engineered using three complementary peptide-tethering schemes. These peptide-functionalized substrates supported alpha(2)beta(1)-mediated cell adhesion and focal adhesion assembly. Our results suggest that this peptide is active in an immobilized conformation and may be applied as a surface modification agent to promote alpha(2)beta(1)-specific cell adhesion. Engineering surfaces that specifically target certain integrin-ligand interactions and signaling cascades provides a biomolecular strategy for optimizing cellular responses in biomaterials and tissue engineering applications.
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Affiliation(s)
- Catherine D Reyes
- Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 315 Ferst Drive, Atlanta, Georgia 30332-0363, USA
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Lauer-Fields JL, Malkar NB, Richet G, Drauz K, Fields GB. Melanoma cell CD44 interaction with the alpha 1(IV)1263-1277 region from basement membrane collagen is modulated by ligand glycosylation. J Biol Chem 2003; 278:14321-30. [PMID: 12574156 DOI: 10.1074/jbc.m212246200] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Invasion of the basement membrane is believed to be a critical step in the metastatic process. Melanoma cells have been shown previously to bind distinct triple-helical regions within basement membrane (type IV) collagen. Additionally, tumor cell binding sites within type IV collagen contain glycosylated hydroxylysine residues. In the present study, we have utilized triple-helical models of the type IV collagen alpha1(IV)1263-1277 sequence to (a) determine the melanoma cell receptor for this ligand and (b) analyze the results of single-site glycosylation on melanoma cell recognition. Receptor identification was achieved by a combination of methods, including (a) cell adhesion and spreading assays using triple-helical alpha1(IV)1263-1277 and an Asp(1266)Abu variant, (b) inhibition of cell adhesion and spreading assays, and (c) triple-helical alpha1(IV)1263-1277 affinity chromatography with whole cell lysates and glycosaminoglycans. Triple-helical alpha1(IV)1263-1277 was bound by melanoma cell CD44/chondroitin sulfate proteoglycan receptors and not by the collagen-binding integrins or melanoma-associated proteoglycan. Melanoma cell adhesion to and spreading on the triple-helical alpha1(IV)1263-1277 sequence was then compared for glycosylated (replacement of Lys(1265) with Hyl(O-beta-d-galactopyranosyl)) versus non-glycosylated ligand. Glycosylation was found to strongly modulate both activities, as adhesion and spreading were dramatically decreased due to the presence of galactose. CD44/chondroitin sulfate proteoglycan did not bind to glycosylated alpha1(IV)1263-1277. Overall, this study (a) is the first demonstration of the prophylactic effects of glycosylation on tumor cell interaction with the basement membrane, (b) provides a rare example of an apparent unfavorable interaction between carbohydrates, and (c) suggests that sugars may mask "cryptic sites" accessible to tumor cells with cell surface or secreted glycosidase activities.
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Affiliation(s)
- Janelle L Lauer-Fields
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton 33431-0991, USA
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Hunziker EB. Articular cartilage repair: basic science and clinical progress. A review of the current status and prospects. Osteoarthritis Cartilage 2002; 10:432-63. [PMID: 12056848 DOI: 10.1053/joca.2002.0801] [Citation(s) in RCA: 1348] [Impact Index Per Article: 61.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To review the basic scientific status of repair in articular cartilage tissue and to assess the efficiency of current clinical therapies instigated for the treatment of structural lesions generated therein as a result of trauma or during the course of various diseases, notably osteoarthritis (OA). Current scientific trends and possible directions for the future will also be discussed. DESIGN A systematic and critical analysis is undertaken, beginning with a description of the spontaneous repair responses in different types of lesion. Surgical interventions aimed at inducing repair without the use of active biologics will then be considered, followed by those involving active biologics and those drawing on autogenic and allogeneic tissue transplantation principles. Cell transplantation approaches, in particular novel tissue engineering concepts, will be critically presented. These will include growth-factor-based biological treatments and gene transfection protocols. A number of technical problems associated with repair interventions, such as tissue integration, tissue retention and the role of mechanical factors, will also be analysed. RESULTS A critical analysis of the literature reveals the existence of many novel and very promising biologically-based approaches for the induction of articular cartilage repair, the vast majority of which are still at an experimental phase of development. But prospective, double-blinded clinical trials comparing currently practiced surgical treatments have, unfortunately, not been undertaken. CONCLUSION The existence of many new and encouraging biological approaches to cartilage repair justifies the future investment of time and money in this research area, particularly given the extremely high socio-economic importance of such therapeutic strategies in the prevention and treatment of these common joint diseases and traumas. Clinical epidemiological and prospective trials are, moreover, urgently needed for an objective, scientific appraisal of current therapies and future novel approaches.
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Affiliation(s)
- E B Hunziker
- M.E. Müller-Institute for Biomechanics, University of Bern, Murtenstrasse 35, Switzerland.
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Van Hoorde L, Van Aken E, Mareel M. Collagen type I: a substrate and a signal for invasion. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2001; 25:105-34. [PMID: 10986721 DOI: 10.1007/978-3-642-59766-4_7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- L Van Hoorde
- Department of Radiotherapy and Nuclear Medicine, Ghent University Hospital, Gent, Belgium
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Lee MC, Sung KL, Kurtis MS, Akeson WH, Sah RL. Adhesive force of chondrocytes to cartilage. Effects of chondroitinase ABC. Clin Orthop Relat Res 2000:286-94. [PMID: 10660724 DOI: 10.1097/00003086-200001000-00029] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Chondrocyte transplantation is a clinical procedure for cartilage repair. Transplanted cells may have difficulty attaching to the surface of chondral lesions because of the anti-adhesive properties of the proteoglycan rich matrix. This study used micromanipulation methods to determine if pretreatment of cartilage with chondroitinase ABC affects chondrocyte adhesion to cartilage and if chondrocytes adhere preferentially to the superficial, middle, or deep layers of cartilage. Bovine chondrocytes were transplanted in vitro on articular cartilage sections cut perpendicular to the articular surface. At various times between 15 and 75 minutes after seeding, a micropipette micromanipulation system was used to measure the adhesion force of individual chondrocytes to cartilage. The chondrocyte adhesion force increased with chondroitinase ABC treatment and seeding time but generally was similar for the different regions of articular cartilage (superficial, middle, deep layer) to which the cells were attached. For normal cartilage, the adhesion force increased from 1.29 +/- 0.24 mdyne after 15 to 30 minutes seeding to 5.29 +/- 0.25 mdyne after 60 to 75 minutes. Treatment with chondroitinase ABC at certain concentrations and durations (1.0 U/mL for 5 minutes or 0.5 or 1 U/mL for 15 minutes) led to an increase in adhesion force, whereas relatively low concentration or treatment time (0.25 U/mL for 15 minutes or 0.5 U/mL for 5 minutes) had little or no detectable effect. The increase in adhesion attributable to chondroitinase ABC treatment appeared most marked (+144% to +292%) for short (15 to 30 minutes) seeding durations but was still significant (+46%) for the longest seeding period (60 to 75 minutes) studied after the 1 U/mL for 15 minute treatment condition. These results provide direct biomechanical evidence that enzymatic treatment of a cartilage surface can enhance chondrocyte adhesion.
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Affiliation(s)
- M C Lee
- Department of Orthopedic Surgery, Seoul National University College of Medicine, Korea
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Fine structure of collagen: Molecular mechanisms of the interactions of collagen. J CHEM SCI 1999. [DOI: 10.1007/bf02871911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Abstract
BACKGROUND Collagen is the most abundant protein in animals. Each polypeptide chain of collagen is composed of repeats of the sequence: Gly-X-Y, where X and Y are often L-proline (Pro) and 4(R)-hydroxy-L-proline (Hyp) residues, respectively. These chains are wound into tight triple helices of great stability. The hydroxyl group of Hyp residues contributes much to this conformational stability. The existing paradigm is that this stability arises from interstrand hydrogen bonds mediated by bridging water molecules. This model was tested using chemical synthesis to replace Hyp residues with 4(R)-fluoro-L-proline (Flp) residues. The fluorine atom in Flp residues does not form hydrogen bonds but does elicit strong inductive effects. RESULTS Replacing the Hyp residues in collagen with Flp residues greatly increases triple-helical stability. The free energy contributed by the fluorine atom in Flp residues is twice that of the hydroxyl group in Hyp residues. The stability of the Flp-containing triple helix far exceeds that of any untemplated collagen mimic of similar size. CONCLUSIONS Bridging water molecules contribute little to collagen stability. Rather, collagen stability relies on previously unappreciated inductive effects. Collagen mimics containing fluorine or other appropriate electron-withdrawing substituents could be the basis of new biomaterials for restorative therapies.
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Affiliation(s)
- S K Holmgren
- Department of Biochemistry, University of Wisconsin-Madison, 53706, USA
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