1
|
Chen S, Huang Z, Visalakshan RM, Liu H, Bachhuka A, Wu Y, Dabare PRL, Luo P, Liu R, Gong Z, Xiao Y, Vasilev K, Chen Z, Chen Z. Plasma polymerized bio-interface directs fibronectin adsorption and functionalization to enhance "epithelial barrier structure" formation via FN-ITG β1-FAK-mTOR signaling cascade. Biomater Res 2022; 26:88. [PMID: 36572920 PMCID: PMC9791785 DOI: 10.1186/s40824-022-00323-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 11/15/2022] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Transepithelial medical devices are increasing utilized in clinical practices. However, the damage of continuous natural epithelial barrier has become a major risk factor for the failure of epithelium-penetrating implants. How to increase the "epithelial barrier structures" (focal adhesions, hemidesmosomes, etc.) becomes one key research aim in overcoming this difficulty. Directly targeting the in situ "epithelial barrier structures" related proteins (such as fibronectin) absorption and functionalization can be a promising way to enhance interface-epithelial integration. METHODS Herein, we fabricated three plasma polymerized bio-interfaces possessing controllable surface chemistry. Their capacity to adsorb and functionalize fibronectin (FN) from serum protein was compared by Liquid Chromatography-Tandem Mass Spectrometry. The underlying mechanisms were revealed by molecular dynamics simulation. The response of gingival epithelial cells regarding the formation of epithelial barrier structures was tested. RESULTS Plasma polymerized surfaces successfully directed distinguished protein adsorption profiles from serum protein pool, in which plasma polymerized allylamine (ppAA) surface favored adsorbing adhesion related proteins and could promote FN absorption and functionalization via electrostatic interactions and hydrogen bonds, thus subsequently activating the ITG β1-FAK-mTOR signaling and promoting gingival epithelial cells adhesion. CONCLUSION This study offers an effective perspective to overcome the current dilemma of the inferior interface-epithelial integration by in situ protein absorption and functionalization, which may advance the development of functional transepithelial biointerfaces. Tuning the surface chemistry by plasma polymerization can control the adsorption of fibronectin and functionalize it by exposing functional protein domains. The functionalized fibronectin can bind to human gingival epithelial cell membrane integrins to activate epithelial barrier structure related signaling pathway, which eventually enhances the formation of epithelial barrier structure.
Collapse
Affiliation(s)
- Shoucheng Chen
- grid.12981.330000 0001 2360 039XHospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, No.56, Lingyuan West Road, Yuexiu District, Guangzhou, 510055 China
| | - Zhuwei Huang
- grid.12981.330000 0001 2360 039XHospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, No.56, Lingyuan West Road, Yuexiu District, Guangzhou, 510055 China
| | | | - Haiwen Liu
- grid.12981.330000 0001 2360 039XHospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, No.56, Lingyuan West Road, Yuexiu District, Guangzhou, 510055 China
| | - Akash Bachhuka
- grid.410367.70000 0001 2284 9230Department of Electronics, Electric and Automatic Engineering, Rovira i Virgili University (URV), Tarragona, 43003 Spain
| | - You Wu
- grid.12981.330000 0001 2360 039XHospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, No.56, Lingyuan West Road, Yuexiu District, Guangzhou, 510055 China
| | - Panthihage Ruvini L. Dabare
- grid.1026.50000 0000 8994 5086Academic Unit of Science, Technology, Engineering and Mathematics (STEM), University of South Australia, Mawson Lakes, SA 5095 Australia
| | - Pu Luo
- grid.12981.330000 0001 2360 039XHospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, No.56, Lingyuan West Road, Yuexiu District, Guangzhou, 510055 China
| | - Runheng Liu
- grid.12981.330000 0001 2360 039XHospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, No.56, Lingyuan West Road, Yuexiu District, Guangzhou, 510055 China
| | - Zhuohong Gong
- grid.12981.330000 0001 2360 039XHospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, No.56, Lingyuan West Road, Yuexiu District, Guangzhou, 510055 China
| | - Yin Xiao
- grid.1024.70000000089150953Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, 4059 Australia
| | - Krasimir Vasilev
- grid.1026.50000 0000 8994 5086Academic Unit of Science, Technology, Engineering and Mathematics (STEM), University of South Australia, Mawson Lakes, SA 5095 Australia
| | - Zhuofan Chen
- grid.12981.330000 0001 2360 039XHospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, No.56, Lingyuan West Road, Yuexiu District, Guangzhou, 510055 China
| | - Zetao Chen
- grid.12981.330000 0001 2360 039XHospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, No.56, Lingyuan West Road, Yuexiu District, Guangzhou, 510055 China
| |
Collapse
|
2
|
Yoshino H, Hasuike A, Sanjo N, Sato D, Kubota T, Nagashima H, Sato S. CO 2 Laser De-epithelization Technique for Subepithelial Connective Tissue Graft: A Study of 21 Recessions. In Vivo 2020; 34:869-875. [PMID: 32111797 DOI: 10.21873/invivo.11851] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 01/06/2020] [Accepted: 01/07/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM To report cases in which we achieved sufficient width of the keratinized gingiva using a coronally advanced flap in combination with a subepithelial connective tissue graft (SCTG) obtained by the 'CO2 laser de-epithelization technique' (CODE). PATIENTS AND METHODS Eleven patients with 21 Miller Class I, II, and III gingival recessions had surgery. To prepare SCTG, free gingival grafts were harvested and de-epithelialized extra-orally. De-epithelialization was conducted by irradiation of CO2 laser. Postoperative examinations were performed at 12 months. RESULTS At 12 months, statistically highly significant root coverage was achieved in all recessions. Complete root coverage was obtained in 7 of the 21 recessions. The treatment yielded mean root coverage of 41.0%, and was associated with a mean gain of keratinized gingiva of 2.9±0.3 mm. CONCLUSION The use of CODE allows harvesting grafts of excellent quality and quantity and increases the keratinization of the overlying mucosal epithelium.
Collapse
Affiliation(s)
- Hiroyuki Yoshino
- Private Practice, Kawaguchi, Japan.,Kawaguchi Institute of Periodontology and Implantology, Kawaguchi, Japan
| | - Akira Hasuike
- Department of Periodontology, Nihon University School of Dentistry, Tokyo, Japan .,Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
| | - Naoya Sanjo
- Kawaguchi Institute of Periodontology and Implantology, Kawaguchi, Japan.,Private Practice, Tokyo, Japan
| | - Daisuke Sato
- Kawaguchi Institute of Periodontology and Implantology, Kawaguchi, Japan.,Private Practice, Tokyo, Japan
| | - Tatsuya Kubota
- Kawaguchi Institute of Periodontology and Implantology, Kawaguchi, Japan.,Department of Periodontology, Nihon University School of Dentistry, Tokyo, Japan
| | - Hidekazu Nagashima
- Kawaguchi Institute of Periodontology and Implantology, Kawaguchi, Japan.,Department of Periodontology, Nihon University School of Dentistry, Tokyo, Japan
| | - Shuichi Sato
- Department of Periodontology, Nihon University School of Dentistry, Tokyo, Japan.,Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
| |
Collapse
|
3
|
Alexaline MM, Magne B, Zuleta Rodríguez A, Nivet M, Bacqueville D, Lataillade J, Trouillas M. Influence of fibrin matrices and their released factors on epidermal substitute phenotype and engraftment. J Tissue Eng Regen Med 2019; 13:1362-1374. [DOI: 10.1002/term.2879] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 04/24/2019] [Accepted: 04/29/2019] [Indexed: 12/12/2022]
Affiliation(s)
- Maia M. Alexaline
- Unité mixte Inserm U1197 ‐ Institut de Recherche Biomédicale des Armées (IRBA), Antenne Centre de Transfusion Sanguine des Armées Clamart France
- Celogos Paris France
| | - Brice Magne
- Unité mixte Inserm U1197 ‐ Institut de Recherche Biomédicale des Armées (IRBA), Antenne Centre de Transfusion Sanguine des Armées Clamart France
- Scarcell therapeutics Paris France
| | - Amparo Zuleta Rodríguez
- Unité mixte Inserm U1197 ‐ Institut de Recherche Biomédicale des Armées (IRBA), Antenne Centre de Transfusion Sanguine des Armées Clamart France
| | - Muriel Nivet
- Unité mixte Inserm U1197 ‐ Institut de Recherche Biomédicale des Armées (IRBA), Antenne Centre de Transfusion Sanguine des Armées Clamart France
| | - Daniel Bacqueville
- Unité mixte Inserm U1197 ‐ Institut de Recherche Biomédicale des Armées (IRBA), Antenne Centre de Transfusion Sanguine des Armées Clamart France
- Service Pharmacologie Division 2 et Pharmacocinétique cutanée, Département PharmacologieCentre R&D Pierre Fabre Dermo‐Cosmétique Toulouse France
| | - Jean‐Jacques Lataillade
- Unité mixte Inserm U1197 ‐ Institut de Recherche Biomédicale des Armées (IRBA), Antenne Centre de Transfusion Sanguine des Armées Clamart France
| | - Marina Trouillas
- Unité mixte Inserm U1197 ‐ Institut de Recherche Biomédicale des Armées (IRBA), Antenne Centre de Transfusion Sanguine des Armées Clamart France
| |
Collapse
|
4
|
Petry L, Kippenberger S, Meissner M, Kleemann J, Kaufmann R, Rieger UM, Wellenbrock S, Reichenbach G, Zöller N, Valesky E. Directing adipose-derived stem cells into keratinocyte-like cells: impact of medium composition and culture condition. J Eur Acad Dermatol Venereol 2018; 32:2010-2019. [PMID: 29705993 DOI: 10.1111/jdv.15010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 03/22/2018] [Indexed: 12/16/2022]
Abstract
BACKGROUND Adipose-derived stem cells (ASC) are known to transdifferentiate into a wide range of different cell species in vitro including along the epidermal lineage. This property makes them a promising tool for regenerative medicine to restore the epidermal barrier. OBJECTIVE This study is dedicated to identify in vitro conditions enabling transdifferentiation to a keratinocyte-like phenotype. In particular, the impact of different culture conditions (media compositions, 2D, 3D cultures) and extracellular matrix (ECM) molecules was evaluated. METHODS Adipose-derived stem cells derived from subcutaneous abdominal fat were characterized by stemness-associated markers and subjected to different media. Epithelial differentiation in 2D cultures was monitored by pan-cytokeratin expression using flow cytometry and immunocytochemistry. To evaluate the impact of different ECM molecules on epidermal stratification, 3D cultures were produced, lifted to the air-liquid interface (ALI) and examined by histological analysis and quantitative real-time RT-PCR. RESULTS We identified a medium composition containing retinoic acid, hydrocortisone, ascorbic acid and BMP-4 enabling maximum pan-cytokeratin expression in 2D cultures. Moreover, adhesion to type IV collagen further promotes the pan-cytokeratin expression. When cultures were lifted to the ALI, significant stratification was observed, particularly in supports coated with type IV collagen or fibronectin. Moreover, epidermal differentiation markers (involucrin, cytokeratin 1 and 14) become induced. CONCLUSION Conditions with hampered wound healing such as non-healing ulcers demand new treatment regimes. The here introduced optimized protocols for transdifferentiation of ASC into keratinocyte-like cells may help to establish more effective treatment procedures.
Collapse
Affiliation(s)
- L Petry
- Dermatology, Venereology and Allergology, Clinic of the Johann Wolfgang Goethe University, Frankfurt/Main, Germany
| | - S Kippenberger
- Dermatology, Venereology and Allergology, Clinic of the Johann Wolfgang Goethe University, Frankfurt/Main, Germany
| | - M Meissner
- Dermatology, Venereology and Allergology, Clinic of the Johann Wolfgang Goethe University, Frankfurt/Main, Germany
| | - J Kleemann
- Dermatology, Venereology and Allergology, Clinic of the Johann Wolfgang Goethe University, Frankfurt/Main, Germany
| | - R Kaufmann
- Dermatology, Venereology and Allergology, Clinic of the Johann Wolfgang Goethe University, Frankfurt/Main, Germany
| | - U M Rieger
- Department of Plastic & Aesthetic, Reconstructive & Hand Surgery, AGAPLESION Markus Hospital, Frankfurt/Main, Germany
| | - S Wellenbrock
- Department of Plastic & Aesthetic, Reconstructive & Hand Surgery, AGAPLESION Markus Hospital, Frankfurt/Main, Germany
| | - G Reichenbach
- Dermatology, Venereology and Allergology, Clinic of the Johann Wolfgang Goethe University, Frankfurt/Main, Germany
| | - N Zöller
- Dermatology, Venereology and Allergology, Clinic of the Johann Wolfgang Goethe University, Frankfurt/Main, Germany
| | - E Valesky
- Dermatology, Venereology and Allergology, Clinic of the Johann Wolfgang Goethe University, Frankfurt/Main, Germany
| |
Collapse
|
5
|
Magin CM, Neale DB, Drinker MC, Willenberg BJ, Reddy ST, La Perle KM, Schultz GS, Brennan AB. Evaluation of a bilayered, micropatterned hydrogel dressing for full-thickness wound healing. Exp Biol Med (Maywood) 2016; 241:986-95. [PMID: 27037279 DOI: 10.1177/1535370216640943] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Nearly 12 million wounds are treated in emergency departments throughout the United States every year. The limitations of current treatments for complex, full-thickness wounds are the driving force for the development of new wound treatment devices that result in faster healing of both dermal and epidermal tissue. Here, a bilayered, biodegradable hydrogel dressing that uses microarchitecture to guide two key steps in the proliferative phase of wound healing, re-epithelialization, and revascularization, was evaluated in vitro in a cell migration assay and in vivo in a bipedicle ischemic rat wound model. Results indicate that the Sharklet™-micropatterned apical layer of the dressing increased artificial wound coverage by up to 64%, P = 0.024 in vitro. In vivo evaluation demonstrated that the bilayered dressing construction enhanced overall healing outcomes significantly compared to untreated wounds and that these outcomes were not significantly different from a leading clinically available wound dressing. Collectively, these results demonstrate high potential for this new dressing to effectively accelerate wound healing.
Collapse
Affiliation(s)
| | - Dylan B Neale
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA
| | | | - Bradley J Willenberg
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA Department of Internal Medicine, University of Central Florida, Orlando, FL 32827, USA Saisijin Biotech, LLC, Orlando, FL 32827, USA
| | | | - Krista Md La Perle
- Department of Veterinary Biosciences, College of Veterinary Medicine and Comparative Pathology & Mouse Phenotyping Shared Resource, Comprehensive Cancer Center The Ohio State University, Columbus, OH 43210, USA
| | - Gregory S Schultz
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Anthony B Brennan
- Sharklet Technologies, Inc., Aurora, CO 80045, USA Saisijin Biotech, LLC, Orlando, FL 32827, USA J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA
| |
Collapse
|
6
|
Tjin MS, Chua AWC, Ma DR, Lee ST, Fong E. Human epidermal keratinocyte cell response on integrin-specific artificial extracellular matrix proteins. Macromol Biosci 2014; 14:1125-34. [PMID: 24789105 DOI: 10.1002/mabi.201400015] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 03/10/2014] [Indexed: 11/11/2022]
Abstract
Cell-matrix interactions play critical roles in regulating cellular behavior in wound repair and regeneration of the human skin. In particular, human skin keratinocytes express several key integrins such as alpha5beta1, alpha3beta1, and alpha2beta1 for binding to the extracellular matrix (ECM) present in the basement membrane in uninjured skin. To mimic these key integrin-ECM interactions, artificial ECM (aECM) proteins containing functional domains derived from laminin 5, type IV collagen, fibronectin, and elastin are prepared. Human skin keratinocyte cell responses on the aECM proteins are specific to the cell-binding domain present in each construct. Keratinocyte attachment to the aECM protein substrates is also mediated by specific integrin-material interactions. In addition, the aECM proteins are able to support the proliferation of keratinocyte stem cells, demonstrating their promise for use in skin tissue engineering.
Collapse
Affiliation(s)
- Monica Suryana Tjin
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, Nanyang Avenue, 639798, Singapore
| | | | | | | | | |
Collapse
|
7
|
Mekala NK, Baadhe RR, Potumarthi R. Mass transfer aspects of 3D cell cultures in tissue engineering. ASIA-PAC J CHEM ENG 2014. [DOI: 10.1002/apj.1800] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Naveen Kumar Mekala
- Department of Biotechnology; National Institute of Technology; Warangal 506004 India
| | - Rama Raju Baadhe
- Department of Biotechnology; National Institute of Technology; Warangal 506004 India
| | | |
Collapse
|
8
|
Bush KA, Pins GD. Development of microfabricated dermal epidermal regenerative matrices to evaluate the role of cellular microenvironments on epidermal morphogenesis. Tissue Eng Part A 2012; 18:2343-53. [PMID: 22724677 DOI: 10.1089/ten.tea.2011.0479] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Topographic features at the dermal-epidermal junction (DEJ) provide instructive cues critical for modulating keratinocyte functions and enhancing the overall architecture and organization of skin. This interdigitated interface conforms to a series of rete ridges and papillary projections on the dermis that provides three-dimensional (3D) cellular microenvironments as well as structural stability between the dermal and epidermal layers during mechanical loading. The dimensions of these cellular microenvironments exhibit regional differences on the surface of the body, and quantitative histological analyses have shown that localization of highly proliferative keratinocytes also varies, according to the regional geometries of these microenvironments. In this study, we combined photolithography, collagen processing, and biochemical conjugation techniques to create microfabricated dermal epidermal regeneration matrices (μDERMs) with features that mimic the native 3D cellular microenvironment at the DEJ. We used this model system to study the effect of the 3D cellular microenvironment on epithelialization and basal keratinocyte interaction with the microenvironment on the surface of the μDERMs. We found that features closely mimicking those in high-friction areas of the body (deep, narrow channels) epithelialized faster than features mimicking low-friction areas. Additionally, when evaluating β1 expression, an integrin involved in epidermal morphogenesis, it was found that integrin-bright expression was localized in the depths of the features, suggesting that the μDERMs may play a role in defining cellular microenvironments as well as a protective environment for the regenerative population of keratinocytes. The outcomes of this study suggest that μDERMs can serve as a robust biomimetic model system to evaluate the roles of the 3D microenvironment on enhancing the regenerative capacity and structural stability of bioengineered skin substitutes.
Collapse
Affiliation(s)
- Katie A Bush
- Program in Biomedical Engineering and Medical Physics, University of Massachusetts Medical School, Worcester, Massachusetts, USA
| | | |
Collapse
|
9
|
Di Mundo R, Nardulli M, Milella A, Favia P, d'Agostino R, Gristina R. Cell adhesion on nanotextured slippery superhydrophobic substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4914-21. [PMID: 21413742 DOI: 10.1021/la200136t] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In this work, the response of Saos2 cells to polymeric surfaces with different roughness/density of nanometric dots produced by a tailored plasma-etching process has been studied. Topographical features have been evaluated by atomic force microscopy, while wetting behavior, in terms of water-surface adhesion energy, has been evaluated by measurements of drop sliding angle. Saos2 cytocompatibility has been investigated by scanning electron microscopy, fluorescent microscopy, and optical microscopy. The similarity in outer chemical composition has allowed isolation of the impact of the topographical features on cellular behavior. The results indicate that Saos2 cells respond differently to surfaces with different nanoscale topographical features, clearly showing a certain inhibition in cell adhesion when the nanoscale is particularly small. This effect appears to be attenuated in surfaces with relatively bigger nanofeatures, though these express a more pronounced slippery/dry wetting character.
Collapse
Affiliation(s)
- Rosa Di Mundo
- Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy
| | | | | | | | | | | |
Collapse
|
10
|
Bush KA, Pins GD. Carbodiimide conjugation of fibronectin on collagen basal lamina analogs enhances cellular binding domains and epithelialization. Tissue Eng Part A 2010; 16:829-38. [PMID: 19778179 DOI: 10.1089/ten.tea.2009.0514] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
To improve the regenerative potential of biomaterials used as bioengineered scaffolds, it is necessary to strategically incorporate biologically active molecules that promote in vivo cellular processes that lead to a fully functional tissue. This work evaluates the effects of strategically binding fibronectin (FN) to collagen basal lamina analogs to enhance keratinocyte functions necessary for complete skin regeneration. We found that FN that was passively adsorbed to collagen-glycosaminoglycan basal lamina analogs enhanced epithelial thickness and keratinocyte proliferation compared with nontreated basal lamina analogs at 3 days of air/liquid (A/L) interface culture. Additionally, we evaluated the availability of FN cellular binding site domains when FN was either passively adsorbed or [1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride] conjugated to basal lamina analogs fabricated from collagen-glycosaminoglycan coprecipitate or self-assembled type I collagen. It was found that 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride conjugation of FN significantly enhanced FN binding site presentation as well as epithelial thickness. Overall, the results gained from this study will be used to improve the regenerative capacity of basal lamina analogs for bioengineered skin substitutes as well as the development of bioengineered scaffolds for other tissue engineering applications.
Collapse
Affiliation(s)
- Katie A Bush
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA 01606, USA
| | | |
Collapse
|
11
|
Tocce EJ, Smirnov VK, Kibalov DS, Liliensiek SJ, Murphy CJ, Nealey PF. The ability of corneal epithelial cells to recognize high aspect ratio nanostructures. Biomaterials 2010; 31:4064-72. [PMID: 20153044 PMCID: PMC2868502 DOI: 10.1016/j.biomaterials.2010.01.101] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Accepted: 01/15/2010] [Indexed: 11/25/2022]
Abstract
The basement membrane of the human corneal epithelium comprises topographic features including fibers, pores, and elevations with feature dimensions on the order of 20-400 nm. Understanding the impact of sub-micron and nanotopography on corneal cell behavior will contribute to our understanding of biomechanical cues and will assist in the design of improved synthetic corneal implants. We utilized well defined ridge and groove wave-like nanostructures (wave ordered structures, WOS) of 60-140 pitches (30-70 nm ridge widths) and 200 nm depths to assess human corneal epithelial cell (HCEC) contact guidance and to establish HCEC contact acuity defined as the lower limit in feature dimensions at which cells respond to biomimetic topographic cues. Results using the WOS substrates demonstrate that HCEC contact acuity is in the range of 60 nm pitch for cells in a serum-free basal medium (EpiLife) and in the range of 90 nm pitch for cells in epithelial medium. To further investigate the influence of HCEC contact acuity in the presence of larger topographic cues, we fabricated 70 nm pitch WOS-overlaid parallel to the top of the ridges of 800-4000 nm pitch. HCEC cultured in epithelial medium demonstrate a significant increase in the percent of cells aligning to 4000 nm pitch topography with WOS-overlay compared to controls (both flat and 70 nm WOS alone) and 4000 nm pitch topography alone. These results highlight the significance of the lower range of basement membrane scale topographic cues on cell response and allow for improved prosthetic design.
Collapse
Affiliation(s)
| | | | | | | | | | - Paul F. Nealey
- Chemical & Biological Engineering, University of Wisconsin, Madison
| |
Collapse
|
12
|
Nirmalanandhan VS, Juncosa-Melvin N, Shearn JT, Boivin GP, Galloway MT, Gooch C, Bradica G, Butler DL. Combined effects of scaffold stiffening and mechanical preconditioning cycles on construct biomechanics, gene expression, and tendon repair biomechanics. Tissue Eng Part A 2009; 15:2103-2111. [PMID: 19191501 DOI: 10.1089/ten.tea.2008.0335] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Our group has previously reported that in vitro mechanical stimulation of tissue-engineered tendon constructs significantly increases both construct stiffness and the biomechanical properties of the repair tissue after surgery. When optimized using response surface methodology, our results indicate that a mechanical stimulus with three components (2.4% strain, 3000 cycles/day, and one cycle repetition) produced the highest in vitro linear stiffness. Such positive correlations between construct and repair stiffness after surgery suggest that enhancing structural stiffness before surgery could not only accelerate repair stiffness but also prevent premature failures in culture due to poor mechanical integrity. In this study, we examined the combined effects of scaffold crosslinking and subsequent mechanical stimulation on construct mechanics and biology. Autologous tissue-engineered constructs were created by seeding mesenchymal stem cells (MSCs) from 15 New Zealand white rabbits on type I collagen sponges that had undergone additional dehydrothermal crosslinking (termed ADHT in this manuscript). Both constructs from each rabbit were mechanically stimulated for 8h/day for 12 consecutive days with half receiving 100 cycles/day and the other half receiving 3000 cycles/day. These paired MSC-collagen autologous constructs were then implanted in bilateral full-thickness, full-length defects in the central third of rabbit patellar tendons. Increasing the number of in vitro cycles/day delivered to the ADHT constructs in culture produced no differences in stiffness or gene expression and no changes in biomechanical properties or histology 12 weeks after surgery. Compared to MSC-based repairs from a previous study that received no additional treatment in culture, ADHT crosslinking of the scaffolds actually lowered the 12-week repair stiffness. Thus, while ADHT crosslinking may initially stiffen a construct in culture, this specific treatment also appears to mask any benefits of stimulation among repairs postsurgery. Our findings emphasize the importance of properly preconditioning a scaffold to better control/modulate MSC differentiation in vitro and to further enhance repair outcome in vivo.
Collapse
|
13
|
Bush KA, Driscoll PF, Soto ER, Lambert CR, McGimpsey WG, Pins GD. Designing tailored biomaterial surfaces to direct keratinocyte morphology, attachment, and differentiation. J Biomed Mater Res A 2009; 90:999-1009. [PMID: 18655147 DOI: 10.1002/jbm.a.32168] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Precisely engineering the surface chemistry of biomaterials to modulate the adsorption and functionality of biochemical signaling molecules that direct cellular functions is critical in the development of tissue engineered scaffolds. Specifically, this study describes the use of functionalized self-assembled monolayers (SAMs) as a model system to assess the effects of biomaterial surface properties on controlling fibronectin (FN) conformation and concentration as well as keratinocyte function. By systematically analyzing FN adsorption at low and saturated surface densities, we distinguished between SAM-dependent effects of FN concentration and conformation on presenting cellular binding domains that direct cellular functions. Quantitative image analyses of immunostained samples showed that modulating the availability of the FN synergy site directly correlated with changes in keratinocyte attachment, spreading, and differentiation, through integrin-mediated signaling mechanisms. The results of this study will be used to elucidate design features that can be incorporated into dermal equivalents and percutaneous implants to enhance the rate of re-epithelialization and tissue regeneration. Furthermore, these findings indicate that SAM-based model systems are a valuable tool for designing and investigating the development of scaffolds that regulate the conformation of extracellular matrix cues and cellular functions that accelerate the rate of tissue regeneration.
Collapse
Affiliation(s)
- K A Bush
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts, USA
| | | | | | | | | | | |
Collapse
|
14
|
A molecularly defined array based on native fibrillar collagen for the assessment of skin tissue engineering biomaterials. Biomaterials 2009; 30:6213-20. [DOI: 10.1016/j.biomaterials.2009.07.050] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2009] [Accepted: 07/24/2009] [Indexed: 11/21/2022]
|
15
|
Pendegrass CJ, Gordon D, Middleton CA, Sun SNM, Blunn GW. Sealing the skin barrier around transcutaneous implants. ACTA ACUST UNITED AC 2008; 90:114-21. [DOI: 10.1302/0301-620x.90b1.19580] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Conventional amputation prostheses rely on the attachment of the socket to the stump, which may lead to soft-tissue complications. Intraosseous transcutaneous amputation prostheses (ITAPs) allow direct loading of the skeleton, but their success is limited by infection resulting from breaching of the skin at the interface with the implant. Keratinocytes provide the skin’s primary barrier function, while hemidesmosomes mediate their attachment to natural ITAP analogues. Keratinocytes must attach directly to the surface of the implant. We have assessed the proliferation, morphology and attachment of keratinocytes to four titaniumalloy surfaces in order to determine the optimal topography in vitro. We used immunolocalisation of adhesion complex components, scanning electron microscopy and transmission electron microscopy to assess cell parameters. We have shown that the proliferation, morphology and attachment of keratinocytes are affected by the surface topography of the biomaterials used to support their growth. Smoother surfaces improved adhesion. We postulate that a smooth topography at the point of epithelium-ITAP contact could increase attachment in vivo, producing an effective barrier of infection.
Collapse
Affiliation(s)
- C. J. Pendegrass
- Centre for Biomedical Engineering, Royal National Orthopaedic Hospital Trust, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK
| | - D. Gordon
- Centre for Biomedical Engineering, Royal National Orthopaedic Hospital Trust, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK
| | - C. A. Middleton
- Centre for Biomedical Engineering, Royal National Orthopaedic Hospital Trust, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK
| | - S. Ng. Man Sun
- Centre for Biomedical Engineering, Royal National Orthopaedic Hospital Trust, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK
| | - G. W. Blunn
- Centre for Biomedical Engineering, Royal National Orthopaedic Hospital Trust, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK
| |
Collapse
|