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Shi X, Janmey PA. Large Polyacrylamide Hydrogels for Large-Batch Cell Culture and Mechanobiological Studies. Macromol Biosci 2023; 23:e2300042. [PMID: 37128976 PMCID: PMC10524403 DOI: 10.1002/mabi.202300042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/24/2023] [Indexed: 05/03/2023]
Abstract
The rigidity of a cell's substrate or extracellular matrix plays a vital role in regulating cell and tissue functions. Polyacrylamide (PAAm) hydrogels are one of the most widely used cell culture substrates that provide a physiologically relevant range of stiffness. However, it is still arduous and time-consuming to prepare PAAm substrates in large batches for high-yield or multiscale cell cultures. In this communication, a simple method to prepare PAAm hydrogels with less time cost and easily accessible materials is presented. The hydrogel is mechanically uniform and supports cell culture in a large batch. It is further shown that the stiffness of the hydrogel covers a large range of Young's modulus and is sensed by cells, regulating various cell features including changes in cell morphology, proliferation, and contractility. This method improves the reproducibility of mechanobiology studies and can be easily applied for mechanobiology research requiring large numbers of cells or experimental groups.
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Affiliation(s)
- Xuechen Shi
- Institute for Medicine and Engineering and Department of Physiology, University of Pennsylvania, Philadelphia, 19104, USA
| | - Paul A Janmey
- Institute for Medicine and Engineering and Department of Physiology, University of Pennsylvania, Philadelphia, 19104, USA
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2
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Tomba C, Migdal C, Fuard D, Villard C, Nicolas A. Poly-l-lysine/Laminin Surface Coating Reverses Glial Cell Mechanosensitivity on Stiffness-Patterned Hydrogels. ACS Appl Bio Mater 2022; 5:1552-1563. [PMID: 35274925 DOI: 10.1021/acsabm.1c01295] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Brain tissues demonstrate heterogeneous mechanical properties, which evolve with aging and pathologies. The observation in these tissues of smooth to sharp rigidity gradients raises the question of brain cell responses to both different values of rigidity and their spatial variations, in dependence on the surface chemistry they are exposed to. Here, we used recent techniques of hydrogel photopolymerization to achieve stiffness texturing down to micrometer resolution in polyacrylamide hydrogels. We investigated primary neuron adhesion and orientation as well as glial cell proliferative properties on these rigidity-textured hydrogels for two adhesive coatings: fibronectin or poly-l-lysine/laminin. Our main observation is that glial cell adhesion and proliferation is favored on the stiffer regions when the adhesive coating is fibronectin and on the softer ones when it consists of poly-l-lysine/laminin. This behavior was unchanged by the presence or the absence of neuronal cells. In addition, glial cells were not confined by sharp, micron-scaled gradients of rigidity. Our observations suggest that rigidity sensing could involve adhesion-related pathways that profoundly depend on surface chemistry.
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Affiliation(s)
- Caterina Tomba
- Univ. Grenoble Alps, CNRS, LTM, 38000 Grenoble, France.,Univ. Grenoble Alps, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
| | - Camille Migdal
- Univ. Grenoble Alps, CNRS, LTM, 38000 Grenoble, France.,Univ. Grenoble Alps, CEA, CNRS, Inserm, BIG-BCI, 38000 Grenoble, France.,Univ. Grenoble Alps, CEA, Inserm, BIG-BGE, 38000 Grenoble, France
| | - David Fuard
- Univ. Grenoble Alps, CNRS, LTM, 38000 Grenoble, France
| | - Catherine Villard
- Univ. Grenoble Alps, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
| | - Alice Nicolas
- Univ. Grenoble Alps, CNRS, LTM, 38000 Grenoble, France
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Abstract
Human mesenchymal stem cells (HMSCs) are important for cell-based therapies. However, the success of HMSC therapy requires large-scale in vitro expansion of these multipotent cells. The traditional expansion of HMSCs on tissue-culture-treated stiff polystyrene induces significant changes in their shape, multipotency, and secretome, leading to early senescence and subdued paracrine activity. To enhance their therapeutic potential, here, we have developed two-dimensional soft hydrogels with imprinted microscale aligned grooves for use as HMSC culture substrates. We showed that, depending on the dimensions of the topographical features, these substrates led to lower cellular spreading and cytoskeletal tension, maintaining multipotency and osteogenic and adipogenic differentiate potential, while lowering cellular senescence. We also observed a greater capacity of HMSCs to produce anti-inflammatory cytokines after short-term priming on these hydrogel substrates. Overall, these soft hydrogels with unique surface topography have shown great promise as in vitro culture substrates to maximize the therapeutic potential of HMSCs.
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Affiliation(s)
- Akram Abbasi
- School of Engineering, Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Sachiko Imaichi
- Takeda Pharmaceuticals, Cambridge, Massachusetts 02139, United States
| | - Vincent Ling
- Takeda Pharmaceuticals, Cambridge, Massachusetts 02139, United States
| | - Anita Shukla
- School of Engineering, Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
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Pérez-Calixto D, Amat-Shapiro S, Zamarrón-Hernández D, Vázquez-Victorio G, Puech PH, Hautefeuille M. Determination by Relaxation Tests of the Mechanical Properties of Soft Polyacrylamide Gels Made for Mechanobiology Studies. Polymers (Basel) 2021; 13:629. [PMID: 33672475 PMCID: PMC7923444 DOI: 10.3390/polym13040629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 02/08/2021] [Accepted: 02/11/2021] [Indexed: 02/04/2023] Open
Abstract
Following the general aim of recapitulating the native mechanical properties of tissues and organs in vitro, the field of materials science and engineering has benefited from recent progress in developing compliant substrates with physical and chemical properties similar to those of biological materials. In particular, in the field of mechanobiology, soft hydrogels can now reproduce the precise range of stiffnesses of healthy and pathological tissues to study the mechanisms behind cell responses to mechanics. However, it was shown that biological tissues are not only elastic but also relax at different timescales. Cells can, indeed, perceive this dissipation and actually need it because it is a critical signal integrated with other signals to define adhesion, spreading and even more complicated functions. The mechanical characterization of hydrogels used in mechanobiology is, however, commonly limited to the elastic stiffness (Young's modulus) and this value is known to depend greatly on the measurement conditions that are rarely reported in great detail. Here, we report that a simple relaxation test performed under well-defined conditions can provide all the necessary information for characterizing soft materials mechanically, by fitting the dissipation behavior with a generalized Maxwell model (GMM). The simple method was validated using soft polyacrylamide hydrogels and proved to be very useful to readily unveil precise mechanical properties of gels that cells can sense and offer a set of characteristic values that can be compared with what is typically reported from microindentation tests.
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Affiliation(s)
- Daniel Pérez-Calixto
- Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico; (D.P.-C.); (S.A.-S.); (D.Z.-H.); (G.V.-V.)
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
- Posgrado en Ciencia e Ingeniería de Materiales, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Samuel Amat-Shapiro
- Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico; (D.P.-C.); (S.A.-S.); (D.Z.-H.); (G.V.-V.)
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Diego Zamarrón-Hernández
- Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico; (D.P.-C.); (S.A.-S.); (D.Z.-H.); (G.V.-V.)
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Genaro Vázquez-Victorio
- Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico; (D.P.-C.); (S.A.-S.); (D.Z.-H.); (G.V.-V.)
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Pierre-Henri Puech
- Adhesion and Inflammation Lab (LAI), Aix Marseille University, LAI UM 61, Inserm, UMR_S 1067, CNRS, UMR 7333, F-13288 Marseille, France;
| | - Mathieu Hautefeuille
- Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico; (D.P.-C.); (S.A.-S.); (D.Z.-H.); (G.V.-V.)
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
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Muncie JM, Ayad NME, Lakins JN, Xue X, Fu J, Weaver VM. Mechanical Tension Promotes Formation of Gastrulation-like Nodes and Patterns Mesoderm Specification in Human Embryonic Stem Cells. Dev Cell 2020; 55:679-694.e11. [PMID: 33207224 PMCID: PMC7755684 DOI: 10.1016/j.devcel.2020.10.015] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 08/20/2020] [Accepted: 10/26/2020] [Indexed: 12/17/2022]
Abstract
Embryogenesis is directed by morphogens that induce differentiation within a defined tissue geometry. Tissue organization is mediated by cell-cell and cell-extracellular matrix (ECM) adhesions and is modulated by cell tension and tissue-level forces. Whether cell tension regulates development by modifying morphogen signaling is less clear. Human embryonic stem cells (hESCs) exhibit an intrinsic capacity for self-organization, which motivates their use as a tractable model of early human embryogenesis. We engineered patterned substrates that recapitulate the biophysical properties of the early embryo and mediate the self-organization of "gastrulation-like" nodes in cultured hESCs. Tissue geometries that generated local nodes of high cell-adhesion tension directed the spatial patterning of the BMP4-dependent "gastrulation-like" phenotype by enhancing phosphorylation and junctional release of β-catenin to promote Wnt signaling and mesoderm specification. Furthermore, direct force application via mechanical stretching promoted BMP-dependent mesoderm specification, confirming that tissue-level forces can directly regulate cell fate specification in early human development.
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Affiliation(s)
- Jonathon M Muncie
- Graduate Program in Bioengineering, University of California, San Francisco and University of California Berkeley, San Francisco, CA 94143, USA; Center for Bioengineering and Tissue Regeneration, Department of Surgery, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Nadia M E Ayad
- Graduate Program in Bioengineering, University of California, San Francisco and University of California Berkeley, San Francisco, CA 94143, USA; Center for Bioengineering and Tissue Regeneration, Department of Surgery, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Johnathon N Lakins
- Center for Bioengineering and Tissue Regeneration, Department of Surgery, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Xufeng Xue
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jianping Fu
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA; Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA; Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Valerie M Weaver
- Center for Bioengineering and Tissue Regeneration, Department of Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA; UCSF Comprehensive Cancer Center, Helen Diller Family Cancer Research Center, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Anatomy, Department of Bioengineering and Therapeutic Sciences, Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA 94143, USA.
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Serna-Márquez N, Rodríguez-Hernández A, Ayala-Reyes M, Martínez-Hernández LO, Peña-Rico MÁ, Carretero-Ortega J, Hautefeuille M, Vázquez-Victorio G. Fibrillar Collagen Type I Participates in the Survival and Aggregation of Primary Hepatocytes Cultured on Soft Hydrogels. Biomimetics (Basel) 2020; 5:E30. [PMID: 32630500 PMCID: PMC7345357 DOI: 10.3390/biomimetics5020030] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 06/15/2020] [Accepted: 06/23/2020] [Indexed: 12/11/2022] Open
Abstract
Liver is an essential organ that carries out multiple functions such as glycogen storage, the synthesis of plasma proteins, and the detoxification of xenobiotics. Hepatocytes are the parenchyma that sustain almost all the functions supported by this organ. Hepatocytes and non-parenchymal cells respond to the mechanical alterations that occur in the extracellular matrix (ECM) caused by organogenesis and regenerating processes. Rearrangements of the ECM modify the composition and mechanical properties that result in specific dedifferentiation programs inside the hepatic cells. Quiescent hepatocytes are embedded in the soft ECM, which contains an important concentration of fibrillar collagens in combination with a basement membrane-associated matrix (BM). This work aims to evaluate the role of fibrillar collagens and BM on actin cytoskeleton organization and the function of rat primary hepatocytes cultured on soft elastic polyacrylamide hydrogels (PAA HGs). We used rat tail collagen type I and Matrigel® as references of fibrillar collagens and BM respectively and mixed different percentages of collagen type I in combination with BM. We also used peptides obtained from decellularized liver matrices (dECM). Remarkably, hepatocytes showed a poor adhesion in the absence of collagen on soft PAA HGs. We demonstrated that collagen type I inhibited apoptosis and activated extracellular signal-regulated kinases 1/2 (ERK1/2) in primary hepatocytes cultured on soft hydrogels. Epidermal growth factor (EGF) was not able to rescue cell viability in conjugated BM but affected cell aggregation in soft PAA HGs conjugated with combinations of different proportions of collagen and BM. Interestingly, actin cytoskeleton was localized and preserved close to plasma membrane (cortical actin) and proximal to intercellular ducts (canaliculi-like structures) in soft conditions; however, albumin protein expression was not preserved, even though primary hepatocytes did not remodel their actin cytoskeleton significantly in soft conditions. This investigation highlights the important role of fibrillar collagens on soft hydrogels for the maintenance of survival and aggregation of the hepatocytes. Data suggest evaluating the conditions that allow the establishment of optimal biomimetic environments for physiology and cell biology studies, where the phenotype of primary cells may be preserved for longer periods of time.
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Affiliation(s)
- Nathalia Serna-Márquez
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia (LaNSBioDyT), Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad de México CP 04510, Mexico; (N.S.-M.); (A.R.-H.); (M.A.-R.); (L.O.M.-H.); (J.C.-O.); (M.H.)
| | - Adriana Rodríguez-Hernández
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia (LaNSBioDyT), Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad de México CP 04510, Mexico; (N.S.-M.); (A.R.-H.); (M.A.-R.); (L.O.M.-H.); (J.C.-O.); (M.H.)
| | - Marisol Ayala-Reyes
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia (LaNSBioDyT), Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad de México CP 04510, Mexico; (N.S.-M.); (A.R.-H.); (M.A.-R.); (L.O.M.-H.); (J.C.-O.); (M.H.)
| | - Lorena Omega Martínez-Hernández
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia (LaNSBioDyT), Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad de México CP 04510, Mexico; (N.S.-M.); (A.R.-H.); (M.A.-R.); (L.O.M.-H.); (J.C.-O.); (M.H.)
- Instituto de Biotecnología, Universidad del Papaloapan, Tuxtepec CP 68301, Oaxaca, Mexico;
| | - Miguel Ángel Peña-Rico
- Instituto de Biotecnología, Universidad del Papaloapan, Tuxtepec CP 68301, Oaxaca, Mexico;
| | - Jorge Carretero-Ortega
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia (LaNSBioDyT), Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad de México CP 04510, Mexico; (N.S.-M.); (A.R.-H.); (M.A.-R.); (L.O.M.-H.); (J.C.-O.); (M.H.)
| | - Mathieu Hautefeuille
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia (LaNSBioDyT), Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad de México CP 04510, Mexico; (N.S.-M.); (A.R.-H.); (M.A.-R.); (L.O.M.-H.); (J.C.-O.); (M.H.)
- Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad de México CP 04510, Mexico
| | - Genaro Vázquez-Victorio
- Laboratorio Nacional de Soluciones Biomiméticas para Diagnóstico y Terapia (LaNSBioDyT), Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad de México CP 04510, Mexico; (N.S.-M.); (A.R.-H.); (M.A.-R.); (L.O.M.-H.); (J.C.-O.); (M.H.)
- Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad de México CP 04510, Mexico
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Díaz Lantada A, Mazarío Picazo N, Guttmann M, Wissmann M, Schneider M, Worgull M, Hengsbach S, Rupp F, Bade K, Plaza GR. Soft-Lithography of Polyacrylamide Hydrogels Using Microstructured Templates: Towards Controlled Cell Populations on Biointerfaces. Materials (Basel) 2020; 13:E1586. [PMID: 32235578 PMCID: PMC7177395 DOI: 10.3390/ma13071586] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/17/2020] [Accepted: 03/25/2020] [Indexed: 02/08/2023]
Abstract
Polyacrylamide hydrogels are interesting materials for studying cells and cell-material interactions, thanks to the possibility of precisely adjusting their stiffness, shear modulus and porosity during synthesis, and to the feasibility of processing and manufacturing them towards structures and devices with controlled morphology and topography. In this study a novel approach, related to the processing of polyacrylamide hydrogels using soft-lithography and employing microstructured templates, is presented. The main novelty relies on the design and manufacturing processes used for achieving the microstructured templates, which are transferred by soft-lithography, with remarkable level of detail, to the polyacrylamide hydrogels. The conceived process is demonstrated by patterning polyacrylamide substrates with a set of vascular-like and parenchymal-like textures, for controlling cell populations. Final culture of amoeboid cells, whose dynamics is affected by the polyacrylamide patterns, provides a preliminary validation of the described strategy and helps to discuss its potentials.
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Affiliation(s)
- Andrés Díaz Lantada
- Product Development Laboratory, Mechanical Engineering Department, Universidad Politécnica de Madrid, c/José Gutiérrez Abascal 2, 28006 Madrid, Spain;
| | - Noelia Mazarío Picazo
- Product Development Laboratory, Mechanical Engineering Department, Universidad Politécnica de Madrid, c/José Gutiérrez Abascal 2, 28006 Madrid, Spain;
- Centre for Biomedical Technology, Universidad Politécnica de Madrid, Parque Científico y Tecnológico de la UPM, Crta. M40, km. 38, 28223 Pozuelo de Alarcón, Madrid, Spain;
| | - Markus Guttmann
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (M.G.); (M.W.); (M.S.); (M.W.); (S.H.); (F.R.); (K.B.)
| | - Markus Wissmann
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (M.G.); (M.W.); (M.S.); (M.W.); (S.H.); (F.R.); (K.B.)
| | - Marc Schneider
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (M.G.); (M.W.); (M.S.); (M.W.); (S.H.); (F.R.); (K.B.)
| | - Matthias Worgull
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (M.G.); (M.W.); (M.S.); (M.W.); (S.H.); (F.R.); (K.B.)
| | - Stefan Hengsbach
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (M.G.); (M.W.); (M.S.); (M.W.); (S.H.); (F.R.); (K.B.)
| | - Florian Rupp
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (M.G.); (M.W.); (M.S.); (M.W.); (S.H.); (F.R.); (K.B.)
| | - Klaus Bade
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (M.G.); (M.W.); (M.S.); (M.W.); (S.H.); (F.R.); (K.B.)
| | - Gustavo R. Plaza
- Centre for Biomedical Technology, Universidad Politécnica de Madrid, Parque Científico y Tecnológico de la UPM, Crta. M40, km. 38, 28223 Pozuelo de Alarcón, Madrid, Spain;
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8
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Datko Williams L, Farley A, Cupelli M, Alapati S, Kennedy MS, Dean D. Effects of substrate stiffness on dental pulp stromal cells in culture. J Biomed Mater Res A 2018; 106:1789-1797. [PMID: 29468814 DOI: 10.1002/jbm.a.36382] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 02/07/2018] [Accepted: 02/09/2018] [Indexed: 12/19/2022]
Abstract
Dental pulp stromal cells (DPSCs) can be differentiated down lineages known to either express bone or dentin specific protein markers. Since the differentiation of cells can be heavily influenced by their environment, it may be possible to influence the osteogenic/odontogenic potential of DPSCs by modulating the mechanical properties of substrate on which they are grown. In this study, human DPSCs were grown with and without hydroxyapatite (HA) microparticles on a range of substrates including fibronectin-coated hydrogels and glass substrates, which represented an elastic moduli range of approximately 3 kPa-50 GPa, over a 21-day period. Alkaline phosphatase activity, osteopontin production, and mineralization were monitored. The presence of HA microparticles increased the relative degree of mineralized matrix produced by the cells relative to those in the same substrate and media condition without the HA microparticles. In addition, cultures with cells grown on stiffer substrates had higher ALP activity and higher degree of mineralization than those grown on softer substrates. This study shows that DPSCs are affected by the mechanical properties of their underlying growth substrate and by the presence of HA microparticles. In addition, relatively stiff substrates (>75 kPa) may be required for significant mineralization of these cultures. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1789-1797, 2018.
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Affiliation(s)
| | - Amanda Farley
- Bioengineering Department, Clemson University, Clemson, South Carolina, 29634
| | - Matthew Cupelli
- Bioengineering Department, Clemson University, Clemson, South Carolina, 29634
| | - Satish Alapati
- Department of Endodontics, University of Illinois at Chicago, Chicago, Illinois, 60612
| | - Marian S Kennedy
- Department of Materials Science and Engineering, Clemson University, Clemson, South Carolina, 29634
| | - Delphine Dean
- Bioengineering Department, Clemson University, Clemson, South Carolina, 29634
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