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Hua W, Zhang C, Raymond L, Mitchell K, Wen L, Yang Y, Zhao D, Liu S, Jin Y. 3D printing-based full-scale human brain for diverse applications. BRAIN-X 2023; 1:e5. [PMID: 37818250 PMCID: PMC10564551 DOI: 10.1002/brx2.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/12/2023]
Abstract
Surgery is the most frequent treatment for patients with brain tumors. The construction of full-scale human brain models, which is still challenging to realize via current manufacturing techniques, can effectively train surgeons before brain tumor surgeries. This paper aims to develop a set of three-dimensional (3D) printing approaches to fabricate customized full-scale human brain models for surgery training as well as specialized brain patches for wound healing after surgery. First, a brain patch designed to fit a wound's shape and size can be easily printed in and collected from a stimuli-responsive yield-stress support bath. Then, an inverse 3D printing strategy, called "peeling-boiled-eggs," is proposed to fabricate full-scale human brain models. In this strategy, the contour layer of a brain model is printed using a sacrificial ink to envelop the target brain core within a photocurable yield-stress support bath. After crosslinking the contour layer, the as-printed model can be harvested from the bath to photo crosslink the brain core, which can be eventually released by liquefying the contour layer. Both the brain patch and full-scale human brain model are successfully printed to mimic the scenario of wound healing after removing a brain tumor, validating the effectiveness of the proposed 3D printing approaches.
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Affiliation(s)
- Weijian Hua
- Department of Mechanical Engineering, University of Nevada Reno, Reno, Nevada, USA
| | - Cheng Zhang
- Department of Mechanical Engineering, University of Nevada Reno, Reno, Nevada, USA
- School of Mechanical Engineering, Dalian University of Technology, Dalian, Liaoning, China
| | - Lily Raymond
- Department of Mechanical Engineering, University of Nevada Reno, Reno, Nevada, USA
| | - Kellen Mitchell
- Department of Mechanical Engineering, University of Nevada Reno, Reno, Nevada, USA
| | - Lai Wen
- Department of Pharmacology, Center for Molecular and Cellular Signaling in the Cardiovascular System, School of Medicine, University of Nevada, Reno, Nevada, USA
| | - Ying Yang
- Department of Chemistry, University of Nevada Reno, Reno, Nevada, USA
| | - Danyang Zhao
- School of Mechanical Engineering, Dalian University of Technology, Dalian, Liaoning, China
| | - Shu Liu
- Department of Gerontology, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning, China
| | - Yifei Jin
- Department of Mechanical Engineering, University of Nevada Reno, Reno, Nevada, USA
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Meissner S, Raos B, Svirskis D. Hydrogels can control the presentation of growth factors and thereby improve their efficacy in tissue engineering. Eur J Pharm Biopharm 2022. [DOI: 10.1016/j.ejpb.2022.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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3
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Gheorghita D, Grosu E, Robu A, Ditu LM, Deleanu IM, Gradisteanu Pircalabioru G, Raiciu AD, Bita AI, Antoniac A, Antoniac VI. Essential Oils as Antimicrobial Active Substances in Wound Dressings. MATERIALS (BASEL, SWITZERLAND) 2022; 15:ma15196923. [PMID: 36234263 PMCID: PMC9570933 DOI: 10.3390/ma15196923] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 09/30/2022] [Accepted: 10/03/2022] [Indexed: 05/13/2023]
Abstract
Wound dressings for skin lesions, such as bedsores or pressure ulcers, are widely used for many patients, both during hospitalization and in subsequent treatment at home. To improve the treatment and shorten the healing time and, therefore, the cost, numerous types of wound dressings have been developed by manufacturers. Considering certain inconveniences related to the intolerance of some patients to antibiotics and the antimicrobial, antioxidant, and curative properties of certain essential oils, we conducted research by incorporating these oils, based on polyvinyl alcohol/ polyvinyl pyrrolidone (PVA/PVP) biopolymers, into dressings. The objective of this study was to study the potential of a polymeric matrix for wound healing, with polyvinyl alcohol as the main material and polyvinyl pyrrolidone and hydroxypropyl methylcellulose (HPMC) as secondary materials, together with additives (plasticizers poly(ethylene glycol) (PEG) and glycerol), stabilizers (Zn stearate), antioxidants (vitamin A and vitamin E), and four types of essential oils (fennel, peppermint, pine, and thyme essential oils). For all the studied samples, the combining compatibility, antimicrobial, and cytotoxicity properties were investigated. The obtained results demonstrated a uniform morphology for almost all the samples and adequate barrier properties for contact with suppurating wounds. The results show that the obtained samples containing essential oils have a good inhibitory effect on, or antimicrobial properties against, Staphylococcus aureus ATCC 25923, Enterococcus faecalis ATCC 29212, Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853, and Candida albicans ATCC 10231. The MTT assay showed that the tested samples were not toxic and did not lead to cell death. The results showed that the essential oils used provide an effective solution as active substances in wound dressings.
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Affiliation(s)
- Daniela Gheorghita
- Faculty of Material Science and Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei Street, 060042 Bucharest, Romania
| | - Elena Grosu
- Faculty of Material Science and Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei Street, 060042 Bucharest, Romania
| | - Alina Robu
- Faculty of Material Science and Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei Street, 060042 Bucharest, Romania
| | - Lia Mara Ditu
- Faculty of Biology, University of Bucharest, 1-3 Intr. Portocalelor Street, 060101 Bucharest, Romania
| | - Iuliana Mihaela Deleanu
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania
| | - Gratiela Gradisteanu Pircalabioru
- Research Institute of the University of Bucharest, 90 Sos. Panduri, 050663 Bucharest, Romania
- Academy of Romanian Scientists, 54 Splaiul Independentei Street, 050094 Bucharest, Romania
| | - Anca-Daniela Raiciu
- Faculty of Pharmacy, Titu Maiorescu University, 22 Dambovnicului Street, 040441 Bucharest, Romania
- S.C. Hofigal Import Export S.A., 2 Intrarea Serelor Street, 042124 Bucharest, Romania
| | - Ana-Iulia Bita
- Faculty of Material Science and Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei Street, 060042 Bucharest, Romania
- Correspondence:
| | - Aurora Antoniac
- Faculty of Material Science and Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei Street, 060042 Bucharest, Romania
| | - Vasile Iulian Antoniac
- Faculty of Material Science and Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei Street, 060042 Bucharest, Romania
- Academy of Romanian Scientists, 54 Splaiul Independentei Street, 050094 Bucharest, Romania
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Hamilton M, Harrington S, Dhar P, Stehno-Bittel L. Hyaluronic Acid Hydrogel Microspheres for Slow Release Stem Cell Delivery. ACS Biomater Sci Eng 2021; 7:3754-3763. [PMID: 34323078 DOI: 10.1021/acsbiomaterials.1c00658] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Cell therapies are hampered by a lack of available delivery systems, resulting in inconsistent outcomes in animal studies and human clinical trials. Hydrogel encapsulants offer a broad range of tunable characteristics in the design of cell delivery vehicles. The focus of the hydrogel field has been on durable encapsulants that provide long-term paracrine function of the cells. However, some cell therapies require cell-to-cell contact in order to elicit their effect. Controlled release microencapsulants would be beneficial in these situations, but appropriate polymers have not been adaptable to microsphere manufacturing because they harden too slowly. We developed and tested a novel microencapsulant formulation (acrylated hyaluronic acid: AHA) with degradation characteristics as a controlled release cell delivery vehicle. The properties of AHA microspheres were evaluated and compared to those of poly(ethylene glycol) diacrylate (PEGDA), a durable hydrogel. AHA microspheres possessed a higher swelling ratio, lower diffusion barrier, faster degradation rate, a lower storage modulus, and a larger average diameter than microspheres composed of PEGDA. Additionally, in vitro cell viability and release and short-term in vivo biocompatibility in immune competent Sprague-Dawley rats was assessed for each microsphere type. Compared to PEGDA, microspheres composed of AHA resulted in significantly less foreign body response in vivo as measured by a lack of cellularity or fibrotic ring in the surrounding tissue and no cellular infiltration into the microsphere. This study illustrates the potential of AHA microspheres as a degradable cell delivery system with superior encapsulated cell viability and biocompatibility with the surrounding tissue.
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Affiliation(s)
- Megan Hamilton
- University of Kansas Bioengineering Program, 1132 Learned Hall, 1530 West 15th Street, Lawrence, Kansas 66045, United States
| | - Stephen Harrington
- Likarda LLC, 10330 Hickman Mills Drive, Suite B, Kansas City, Missouri 64137, United States
| | - Prajnaparamita Dhar
- University of Kansas Bioengineering Program, 1132 Learned Hall, 1530 West 15th Street, Lawrence, Kansas 66045, United States.,Department of Chemical and Petroleum Engineering, The University of Kansas, 4132 Learned Hall, 1530 West 15th Street, Lawrence, Kansas 66045, United States
| | - Lisa Stehno-Bittel
- Likarda LLC, 10330 Hickman Mills Drive, Suite B, Kansas City, Missouri 64137, United States
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Huh J, Moon YW, Park J, Atala A, Yoo JJ, Lee SJ. Combinations of photoinitiator and UV absorber for cell-based digital light processing (DLP) bioprinting. Biofabrication 2021; 13:034103. [PMID: 33930877 DOI: 10.1088/1758-5090/abfd7a] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 04/30/2021] [Indexed: 11/12/2022]
Abstract
Digital light processing (DLP) bioprinting, which provides predominant speed, resolution, and adaptability for fabricating complex cell-laden three-dimensional (3D) structures, requires a combination of photoinitiator (PI) and UV absorber (UA) that plays critical roles during the photo-polymerization of bioinks. However, the PI and UA combination has not been highlighted for cell-based DLP bioprinting. In this study, the most used PIs and UAs in cell-based bioprinting were compared to optimize a combination that can ensure the maximum DLP printability, while maintaining the cellular activities during the process. The crosslinking time and printability of PIs were assessed, which are critical in minimizing the cell damage by the UV exposure during the fabrication process. On the other hand, the UAs were evaluated based on their ability to prevent the over-curing of layers beyond the focal layer and the scattering of light, which are required for the desirable crosslinking of a hydrogel and high resolution (25-50µms) to create a complex 3D cell-laden construct. Lastly, the cytotoxicity of PIs and UAs was assessed by measuring the cellular activity of 2D cultured and 3D bioprinted cells. The optimized PI and UA combination provided high initial cell viability (>90%) for up to 14 days in culture and could fabricate complex 3D structures like a perfusable heart-shaped construct with open vesicles and atriums. This combination can provide a potential starting condition when preparing the bioink for the cell-based DLP bioprinting in tissue engineering applications.
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Affiliation(s)
- JunTae Huh
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, United States of America
| | - Young-Wook Moon
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
| | - Jihoon Park
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, United States of America
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, United States of America
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, United States of America
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6
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Hammer JA, West JL. Chemically Orthogonal Protein Ligation Domains for Independent Control of Hydrogel Modification with Adhesive Ligands and Growth Factors. Bioconjug Chem 2020; 31:2504-2512. [PMID: 33089994 DOI: 10.1021/acs.bioconjchem.0c00405] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The twin, chemically orthogonal protein ligation domains, SpyCatcher and SnoopCatcher, were used to link two engineered proteins into poly(ethylene glycol) (PEG) hydrogels in order to control both endothelial cell adhesion and material-mediated pro-mitotic stimulation. SpyCatcher was appended with an N-terminal adhesion ligand RGDS to form RGDS-SC, and SnoopCatcher was appended with the vascular endothelial growth factor (VEGF)-mimetic peptide QK to form QK-SnpC. QK-SnpC formed a spontaneous covalent bond with SnoopTag peptide with 40% reaction efficiency, both in solution, in a PEG gel containing SnoopTag peptide, and in a PEG gel with both SnoopTag and SpyTag sites. QK-SnpC added to cell culture media enhanced endothelial cell proliferation compared to a negative control, and was statistically indistinguishable from the positive control of 130 pM VEGF165. Endothelial cells seeded onto PEG gels presenting both RGDS-SC and QK-SnpC showed ∼50% of cells actively proliferating (defined as Ki67+), compared to ∼31% of cells seeded on gels presenting RGDS-SC alone. These results show that complementary nondiffusing biochemical signals can be linked into PEG-DA hydrogels simultaneously using 'Catcher-based ligation strategies, thereby inducing more nuanced cell-material interactions.
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Affiliation(s)
- Joshua A Hammer
- Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, North Carolina 27708-0281, United States
| | - Jennifer L West
- Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, North Carolina 27708-0281, United States
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7
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What is the quality of hydrogel spacer insertions? and which patients will benefit? A literature review. JOURNAL OF RADIOTHERAPY IN PRACTICE 2020. [DOI: 10.1017/s1460396919000979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
AbstractAim:To evaluate the quality of rectal hydrogel spacer (HS) insertions from literature in patients undergoing radical radiotherapy for prostate cancer. The secondary aim is to assess the benefit of HSs in patients with risk factors more likely to have rectal complications, such as non-conventional radiotherapy dose fractionations and high-risk disease.Method and materials:A literature search of peer-reviewed electronic articles was carried out using Boolean connectors and Medical Subject Headings in the databases. Databases searched included ScienceDirect, Medline and Cinahl. The articles were assessed using relevant critical appraisal skills programme tools.Results:From the 26 studies used, HS showed a clinically significant relative reduction in rectal planning dose volumes for both high- and low-risk prostate cancer patients in a range of radiotherapy treatment modalities including volumetric modulated arc therapy, intensity-modulated radiotherapy, intensity-modulated proton therapy, stereotactic ablative body radiotherapy and brachytherapy. Spacer placements were successfully inserted in 99% of patients. However, rectal wall infiltration occurrence was 6% and ≥2 cm unsymmetrical placements in 2%.Findings:A spacer scoring system based on the HS symmetry has provided evidence of the quality of the position inserted, which was visually aided by T2-wieghted MRIs. Despite optimal HS placements ranging from 62 to 72%, HS had a clinically significant reduction of ≥25% in planned rectal V70 dose in 97% of patients.
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8
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Li W, Fan X, Wang Y, Wang J, Li M, Li X, Tang K, Wan G. A glycidyl methacrylate modified collagen/polyethylene glycol diacrylate hydrogel: a mechanically strong hydrogel for loading levofloxacin. NEW J CHEM 2020. [DOI: 10.1039/d0nj02853c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Artificial suturing of incision after ocular trauma is very complicated and is prone to infection.
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Affiliation(s)
- Weilin Li
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
- College of Ecology and Resources Engineering
| | - Xialian Fan
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
- The First Affiliated Hospital of Zhengzhou University
| | - Ying Wang
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Jingru Wang
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Mengya Li
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Xiumin Li
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Keyong Tang
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Guangming Wan
- The First Affiliated Hospital of Zhengzhou University
- Zhengzhou 450052
- China
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9
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Luong TD, Zoughaib M, Garifullin R, Kuznetsova S, Guler MO, Abdullin TI. In Situ functionalization of Poly(hydroxyethyl methacrylate) Cryogels with Oligopeptides via β-Cyclodextrin–Adamantane Complexation for Studying Cell-Instructive Peptide Environment. ACS APPLIED BIO MATERIALS 2019; 3:1116-1128. [DOI: 10.1021/acsabm.9b01059] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Thai Duong Luong
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia
| | - Mohamed Zoughaib
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia
| | - Ruslan Garifullin
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia
- Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
| | - Svetlana Kuznetsova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia
| | - Mustafa O. Guler
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Timur I. Abdullin
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia
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10
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Matta R, Lee S, Genet N, Hirschi KK, Thomas JL, Gonzalez AL. Minimally Invasive Delivery of Microbeads with Encapsulated, Viable and Quiescent Neural Stem Cells to the Adult Subventricular Zone. Sci Rep 2019; 9:17798. [PMID: 31780709 PMCID: PMC6882840 DOI: 10.1038/s41598-019-54167-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 11/09/2019] [Indexed: 01/29/2023] Open
Abstract
Stem cell therapies demonstrate promising results as treatment for neurological disease and injury, owing to their innate ability to enhance endogenous neural tissue repair and promote functional recovery. However, delivery of undifferentiated and viable neuronal stem cells requires an engineered delivery system that promotes integration of transplanted cells into the inflamed and cytotoxic region of damaged tissue. Within the brain, endothelial cells (EC) of the subventricular zone play a critical role in neural stem cell (NSC) maintenance, quiescence and survival. Therefore, here, we describe the use of polyethylene glycol microbeads for the coincident delivery of EC and NSC as a means of enhancing appropriate NSC quiescence and survival during transplantation into the mouse brain. We demonstrate that EC and NSC co-encapsulation maintained NSC quiescence, enhanced NSC viability, and facilitated NSC extravasation in vitro, as compared to NSC encapsulated alone. In addition, co-encapsulated cells delivered to an in vivo non-injury model reduced inflammatory response compared to freely injected NSC. These results suggest the strong potential of a biomimetic engineered niche for NSC delivery into the brain following neurological injury.
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Affiliation(s)
- Rita Matta
- Department of Biomedical Engineering, Yale University School of Medicine, New Haven, CT, 06511, United States
| | - Seyoung Lee
- Department of Neurology, Yale University School of Medicine, New Haven, CT, 06511, United States
- Yale Stem Cell Center, Yale University School of Medicine, New Haven, CT, 06511, United States
| | - Nafiisha Genet
- Yale Stem Cell Center, Yale University School of Medicine, New Haven, CT, 06511, United States
- Yale Cardiovascular Research Center, Yale University School of Medicine, New Haven, CT, 06511, United States
| | - Karen K Hirschi
- Department of Biomedical Engineering, Yale University School of Medicine, New Haven, CT, 06511, United States
- Yale Stem Cell Center, Yale University School of Medicine, New Haven, CT, 06511, United States
- Yale Cardiovascular Research Center, Yale University School of Medicine, New Haven, CT, 06511, United States
| | - Jean-Leon Thomas
- Department of Neurology, Yale University School of Medicine, New Haven, CT, 06511, United States.
- Yale Stem Cell Center, Yale University School of Medicine, New Haven, CT, 06511, United States.
- Sorbonne Universités, UPMC Université Paris 06, Institut National de la Santé et de la Recherche Médicale U1127, Centre National de la Recherche Scientifique, AP-HP, Institut du Cerveau et de la Moelle Epinière, Hôpital Pitié-Salpêtrière, Paris, France.
| | - Anjelica L Gonzalez
- Department of Biomedical Engineering, Yale University School of Medicine, New Haven, CT, 06511, United States.
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11
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Using Tools from Optogenetics to Create Light-Responsive Biomaterials: LOVTRAP-PEG Hydrogels for Dynamic Peptide Immobilization. Ann Biomed Eng 2019; 48:1885-1894. [PMID: 31720906 DOI: 10.1007/s10439-019-02407-w] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 11/07/2019] [Indexed: 10/25/2022]
Abstract
Hydrogel materials have become a versatile platform for in vitro cell culture due to their ability to simulate many aspects of native tissues. However, precise spatiotemporal presentation of peptides and other biomolecules has remained challenging. Here we report the use of light-sensing proteins (LSPs), more commonly used in optogenetics research, as light-activated reversible binding sites within synthetic poly(ethylene glycol) (PEG) hydrogels. We used LOVTRAP, a two component LSP system consisting of LOV2, a protein domain that can cycle reversibly between "light" and "dark" conformations in response to blue light, and a z-affibody, Zdark (Zdk), that binds the dark state of LOV2, to spatiotemporally control the presentation of a recombinant protein within PEG hydrogels. By immobilizing LOV2 within PEG gels, we were able to capture a recombinant fluorescent protein (used as a model biomolecule) containing a Zdk domain, and then release the Zdk fusion protein using blue light. Zdk was removed from LOV2-containing PEG gels using focused blue light, resulting in a 30% reduction of fluorescence compared to unexposed regions of the gel. Additionally, the reversible binding capability of LOVTRAP was observed in our system, enabling our LOV2 gels to capture and release Zdk at least three times. By adding a Zdk domain to a recombinant peptide or protein, dynamic, spatially constrained displays of non-diffusing ligands within a PEG gel could feasibly be achieved using LOV2.
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12
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Photoluminescent functionalized carbon quantum dots loaded electroactive Silk fibroin/PLA nanofibrous bioactive scaffolds for cardiac tissue engineering. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2019; 202:111680. [PMID: 31810038 DOI: 10.1016/j.jphotobiol.2019.111680] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 10/23/2019] [Accepted: 10/30/2019] [Indexed: 01/27/2023]
Abstract
Tissue engineering and stem cell rehabilitation are the hopeful aspects that are being investigated for the management of Myocardial Infarction (MI); cardiac patches have been used to start myocardial rejuvenation. In this study, we engineered p-phenylenediamine surface functionalized (modif-CQD) into the Silk fibroin/PLA (SF/PLA) nanofibrous bioactive scaffolds with improved physico-chemical abilities, mechanical and cytocompatibility to cardiomyocytes. The micrograph results visualized the morphological improved spherical modif-CQD have been equivalently spread throughout the SF/PLA bioactive cardiac scaffolds. The fabricated CQD@SF/PLA nanofibrous bioactive scaffolds were highly porous with fully consistent pores; effectively improved young modulus and swelling asset for the suitability and effective implantation efficacy. The scaffolds were prepared with rat cardiomyocytes and cultured for up to 7 days, without electrical incentive. After 7 days of culture, the scaffold pores all over the construct volume were overflowing with cardiomyocytes. The metabolic activity and viability of the cardiomyocytes in CQD@SF/PLA scaffolds were significantly higher than cardiomyocytes in Silk fibroin /PLA scaffolds. The integration of CQD also influenced greatly and increases the expression of cardiac-marker genes. The results of the present investigations evidently recommended that well-organized cardiac nanofibrous scaffold with greater cardiac related mechanical abilities and biocompatibilities for cardiac tissue engineering and nursing care applications.
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13
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Hosoyama K, Lazurko C, Muñoz M, McTiernan CD, Alarcon EI. Peptide-Based Functional Biomaterials for Soft-Tissue Repair. Front Bioeng Biotechnol 2019; 7:205. [PMID: 31508416 PMCID: PMC6716508 DOI: 10.3389/fbioe.2019.00205] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Accepted: 08/09/2019] [Indexed: 11/15/2022] Open
Abstract
Synthetically derived peptide-based biomaterials are in many instances capable of mimicking the structure and function of their full-length endogenous counterparts. Combine this with the fact that short mimetic peptides are easier to produce when compared to full length proteins, show enhanced processability and ease of modification, and have the ability to be prepared under well-defined and controlled conditions; it becomes obvious why there has been a recent push to develop regenerative biomaterials from these molecules. There is increasing evidence that the incorporation of peptides within regenerative scaffolds can result in the generation of structural recognition motifs that can enhance cell attachment or induce cell signaling pathways, improving cell infiltration or promote a variety of other modulatory biochemical responses. By highlighting the current approaches in the design and application of short mimetic peptides, we hope to demonstrate their potential in soft-tissue healing while at the same time drawing attention to the advances made to date and the problems which need to be overcome to advance these materials to the clinic for applications in heart, skin, and cornea repair.
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Affiliation(s)
- Katsuhiro Hosoyama
- Division of Cardiac Surgery Research, University of Ottawa Heart Institute, Ottawa, ON, Canada
| | - Caitlin Lazurko
- Division of Cardiac Surgery Research, University of Ottawa Heart Institute, Ottawa, ON, Canada.,Biochemistry, Microbiology and Immunology Department, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Marcelo Muñoz
- Division of Cardiac Surgery Research, University of Ottawa Heart Institute, Ottawa, ON, Canada
| | - Christopher D McTiernan
- Division of Cardiac Surgery Research, University of Ottawa Heart Institute, Ottawa, ON, Canada
| | - Emilio I Alarcon
- Division of Cardiac Surgery Research, University of Ottawa Heart Institute, Ottawa, ON, Canada.,Biochemistry, Microbiology and Immunology Department, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
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14
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Hammer JA, Ruta A, Therien AM, West JL. Cell-Compatible, Site-Specific Covalent Modification of Hydrogel Scaffolds Enables User-Defined Control over Cell-Material Interactions. Biomacromolecules 2019; 20:2486-2493. [PMID: 31121097 DOI: 10.1021/acs.biomac.9b00183] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
SpyCatcher, a 15 kDa protein domain that spontaneously forms a site-specific covalent bond with the 13 amino acid peptide SpyTag, was used to covalently link a model recombinant protein containing a SpyCatcher domain and the adhesive ligand Arg-Gly-Asp-Ser (RGDS) (RGDS-SC) into SpyTag-containing poly(ethylene glycol) (PEG) hydrogels. This new strategy for covalent immobilization of proteins or peptides provides an easy and gentle mechanism for biochemical modification of hydrogels. Labeling efficiency was approximately 100% when soluble RGDS-SC was applied to SpyTag-containing hydrogels at a 1:1 molar ratio. RGDS-SC remained stably bound throughout the 5 days of rinsing, and 3T3 fibroblasts were able to adhere to PEG gels presenting RGDS-SC, but did not adhere when the scrambled amino acid sequence RDGS was presented instead. Fibroblasts encapsulated within 3D cell-degradable PEG hydrogels containing SpyTag did not spread until RGDS-SC was added to the gels, at which point cell spreading was induced. This cell-friendly site-specific ligation strategy could have great utility in driving specific cellular outcomes using biochemically dynamic hydrogels.
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Affiliation(s)
- Joshua A Hammer
- Department of Biomedical Engineering , Duke University , 101 Science Drive Campus Box 90281 , Durham , North Carolina 27708-0281 , United States
| | - Anna Ruta
- Department of Biomedical Engineering , Duke University , 101 Science Drive Campus Box 90281 , Durham , North Carolina 27708-0281 , United States
| | - Aidan M Therien
- Department of Biomedical Engineering , Duke University , 101 Science Drive Campus Box 90281 , Durham , North Carolina 27708-0281 , United States
| | - Jennifer L West
- Department of Biomedical Engineering , Duke University , 101 Science Drive Campus Box 90281 , Durham , North Carolina 27708-0281 , United States
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15
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Kim M, Lee S, Ki CS. Cellular Behavior of RAW264.7 Cells in 3D Poly(ethylene glycol) Hydrogel Niches. ACS Biomater Sci Eng 2019; 5:922-932. [PMID: 33405849 DOI: 10.1021/acsbiomaterials.8b01150] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Although macrophages undergo dynamic cellular responses in diverse extracellular environments, macrophage research has mostly relied on conventional culture methodologies such as two-dimensional and suspension cultures. In contrast, recent efforts have revealed evidence of the characteristic cellular behaviors of macrophages in actual tissues using a three-dimensional (3D) culture matrix. In this work, we exploited a poly(ethylene glycol)-based hydrogel as a macrophage culture matrix and observed cellular behaviors in 3D by manipulating the matrix properties. In the 3D microenvironment, macrophage-like RAW264.7 cells proliferated and formed spherical clusters by degrading the surrounding hydrogel network. Interestingly, we observed the significant upregulation of matrix metalloproteinases (MMPs) (i.e., MMP9 and MMP14) as well as M1 polarization markers (i.e., iNOS, COX2, TNF-α) in 3D, whereas M2 polarization markers (i.e., CD206, Arg1, TGF-β) were downregulated. Specifically, the expressions of both M1 and M2 markers were simultaneously increased in a stiff matrix compared to those of a soft matrix. In addition, matrix degradability significantly influenced the TNF-α secretion of encapsulated RAW264.7 cells. The MMP sensitivity of the hydrogel decreased TNF-α expression in a soft matrix, whereas it upregulated TNF-α in a stiff matrix compared to those of MMP-insensitive hydrogel. These findings suggest that the highly tunable poly(ethylene glycol) hydrogels can dictate macrophage behavior by altering the surrounding 3D microenvironment.
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16
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Polycaprolactone porous template facilitates modulated release of molecules from alginate hydrogels. REACT FUNCT POLYM 2018. [DOI: 10.1016/j.reactfunctpolym.2018.09.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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17
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Dhillon J, Young SA, Sherman SE, Bell GI, Amsden BG, Hess DA, Flynn LE. Peptide-modified methacrylated glycol chitosan hydrogels as a cell-viability supporting pro-angiogenic cell delivery platform for human adipose-derived stem/stromal cells. J Biomed Mater Res A 2018; 107:571-585. [PMID: 30390406 DOI: 10.1002/jbm.a.36573] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 09/26/2018] [Accepted: 10/27/2018] [Indexed: 12/18/2022]
Abstract
Cell-based therapies involving the injection of adipose-derived stem/stromal cells (ASCs) within rationally designed biomaterials are a promising approach for stimulating angiogenesis. With this focus, the current work explored the effects of incorporating integrin-binding RGD or IKVAV peptides within in situ-gelling N-methacrylate glycol chitosan (MGC) hydrogels on the response of encapsulated human ASCs. Initial studies focused on hydrogel characterization to validate that the MGC, MGC-RGD, and MGC-IKVAV hydrogels had similar biomechanical properties. ASC viability following encapsulation and culture under 2% O2 was significantly impaired in the MGC-IKVAV group relative to the MGC and MGC-RGD groups. In contrast, sustained viability, along with enhanced cell spreading and metabolic activity were observed in the MGC-RGD group. Investigation of angiogenic transcription suggested that the incorporation of the peptide groups did not substantially alter the pro-angiogenic gene expression profile of the encapsulated ASCs after 7 days of culture under 2% O2. Consistent with the in vitro findings, preliminary in vivo characterization following subcutaneous implantation into NOD/SCID mice showed that ASC retention was enhanced in the MGC-RGD hydrogels relative to the MGC-IKVAV group at 14 days. Further, the encapsulated ASCs in the MGC and MGC-RGD groups promoted murine CD31+ endothelial cell recruitment to the peri-implant region. Overall, the results indicate that the MGC-RGD and MGC hydrogels are promising platforms for ASC delivery, and suggest that strategies that support long-term ASC viability can augment in vivo angiogenesis through paracrine mechanisms. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 107A: 571-585, 2019.
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Affiliation(s)
- Jobanpreet Dhillon
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, N6A 3K7, Canada.,Krembil Centre for Stem Cell Biology, Molecular Medicine Research Laboratories, Robarts Research Institute, London, Ontario, N6A 5B7, Canada
| | - Stuart A Young
- Department of Chemical Engineering, Queen's University, Kingston, Ontario, K7L 3N6, Canada.,Human Mobility Research Centre, Queen's University, Kingston, Ontario, K7L 3N6, Canada
| | - Stephen E Sherman
- Krembil Centre for Stem Cell Biology, Molecular Medicine Research Laboratories, Robarts Research Institute, London, Ontario, N6A 5B7, Canada.,Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada
| | - Gillian I Bell
- Krembil Centre for Stem Cell Biology, Molecular Medicine Research Laboratories, Robarts Research Institute, London, Ontario, N6A 5B7, Canada.,Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada
| | - Brian G Amsden
- Department of Chemical Engineering, Queen's University, Kingston, Ontario, K7L 3N6, Canada.,Human Mobility Research Centre, Queen's University, Kingston, Ontario, K7L 3N6, Canada
| | - David A Hess
- Krembil Centre for Stem Cell Biology, Molecular Medicine Research Laboratories, Robarts Research Institute, London, Ontario, N6A 5B7, Canada.,Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada
| | - Lauren E Flynn
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, N6A 3K7, Canada.,Department of Chemical and Biochemical Engineering, Thompson Engineering Building, The University of Western Ontario, London, Ontario, N6A 5B9, Canada
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18
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O'Halloran NA, Dolan EB, Kerin MJ, Lowery AJ, Duffy GP. Hydrogels in adipose tissue engineering-Potential application in post-mastectomy breast regeneration. J Tissue Eng Regen Med 2018; 12:2234-2247. [PMID: 30334613 DOI: 10.1002/term.2753] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 10/02/2018] [Accepted: 10/15/2018] [Indexed: 12/11/2022]
Abstract
Current methods of breast reconstruction are associated with significant shortcomings, including capsular contracture, infection, rupture, the need for reoperation in implant-based reconstruction, and donor site morbidity in autologous reconstruction. These limitations result in severe physical and psychological issues for breast cancer patients. Recently, research has moved into the field of adipose tissue engineering to overcome these limitations. A wide range of regenerative strategies has been devised utilising various scaffold designs and biomaterials. A scaffold capable of providing appropriate biochemical and biomechanical cues for adipogenesis is required. Hydrogels have been widely studied for their suitability for adipose tissue regeneration and are advantageous secondary to their ability to accurately imitate the native extracellular matrix. The aim of this review was to analyse the use of hydrogel scaffolds in the field of adipose tissue engineering.
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Affiliation(s)
- Niamh A O'Halloran
- Discipline of Surgery, The Lambe Institute, National University of Ireland Galway, Galway, Ireland
| | - Eimear B Dolan
- School of Pharmacy, Royal College of Surgeons in Ireland, Dublin 2, Ireland.,Tissue Engineering Research Group, Department of Anatomy, Royal College of Surgeons in Ireland, Dublin 2, Ireland.,Discipline of Anatomy, School of Medicine, College of Medicine Nursing and Health Sciences, National University of Ireland Galway, Galway, Ireland
| | - Michael J Kerin
- Discipline of Surgery, The Lambe Institute, National University of Ireland Galway, Galway, Ireland
| | - Aoife J Lowery
- Discipline of Surgery, The Lambe Institute, National University of Ireland Galway, Galway, Ireland
| | - Garry P Duffy
- Discipline of Anatomy, School of Medicine, College of Medicine Nursing and Health Sciences, National University of Ireland Galway, Galway, Ireland
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19
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Goonoo N. Vascularization and angiogenesis in electrospun tissue engineered constructs: towards the creation of long-term functional networks. Biomed Phys Eng Express 2018. [DOI: 10.1088/2057-1976/aaab03] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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20
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Turner PA, Garrett MR, Didion SP, Janorkar AV. Spheroid Culture System Confers Differentiated Transcriptome Profile and Functional Advantage to 3T3-L1 Adipocytes. Ann Biomed Eng 2018; 46:772-787. [PMID: 29500565 DOI: 10.1007/s10439-018-1993-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 02/05/2018] [Indexed: 12/21/2022]
Abstract
This study highlights functional differences between 2-D monolayer and 3-D spheroid 3T3-L1 adipocyte culture models and explores the underlying genomic mechanisms responsible for the different phenotypes present. The spheroids showed higher triglyceride accumulation than the monolayer culture and further increase with larger spheroid size. Whole transcriptome analysis indicated significant differential expression of genes related to adipogenesis, including adipocytokine signaling, fatty acid metabolism, and PPAR-γ signaling. Spheroids also showed downregulation of matrix metalloproteinases (MMPs), integrin, actin-cytoskeleton associated genes, and Rho/GTPase3 expression relative to 2-D monolayer, indicating suppression of the Rho-ROCK pathway and thereby promoting adipogenic differentiation. When exposed to linoleic acid (500 μM) and TNF-α (125 ng/mL) to promote chronic adiposity, linoleic acid treatment resulted in increased intracellular triglycerides and subsequent TNF-α treatment resulted in significantly altered adipocytokine signaling, fatty acid metabolism, and PPAR signaling, in addition to upregulation of multiple MMPs in spheroids vs. monolayer. Overall, 3-D spheroids showed enhanced adipogenic phenotype as indicated by triglyceride synthesis and transcriptome changes while retaining sensitivity to a pro-inflammatory stimulus. The 3-D spheroid culture thus may provide a simple, convenient, and sensitive in vitro model to study adipocyte response to metabolic stresses relevant to clinical pathologies.
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Affiliation(s)
- Paul A Turner
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, Jackson, MS, USA
| | - Michael R Garrett
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson, MS, USA
| | - Sean P Didion
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson, MS, USA
| | - Amol V Janorkar
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, Jackson, MS, USA.
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21
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Lim KS, Martens P, Poole-Warren L. Biosynthetic Hydrogels for Cell Encapsulation. SPRINGER SERIES IN BIOMATERIALS SCIENCE AND ENGINEERING 2018. [DOI: 10.1007/978-3-662-57511-6_1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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22
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Madl CM, LeSavage BL, Dewi RE, Dinh CB, Stowers RS, Khariton M, Lampe KJ, Nguyen D, Chaudhuri O, Enejder A, Heilshorn SC. Maintenance of neural progenitor cell stemness in 3D hydrogels requires matrix remodelling. NATURE MATERIALS 2017; 16:1233-1242. [PMID: 29115291 PMCID: PMC5708569 DOI: 10.1038/nmat5020] [Citation(s) in RCA: 266] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 10/02/2017] [Indexed: 05/07/2023]
Abstract
Neural progenitor cell (NPC) culture within three-dimensional (3D) hydrogels is an attractive strategy for expanding a therapeutically relevant number of stem cells. However, relatively little is known about how 3D material properties such as stiffness and degradability affect the maintenance of NPC stemness in the absence of differentiation factors. Over a physiologically relevant range of stiffness from ∼0.5 to 50 kPa, stemness maintenance did not correlate with initial hydrogel stiffness. In contrast, hydrogel degradation was both correlated with, and necessary for, maintenance of NPC stemness. This requirement for degradation was independent of cytoskeletal tension generation and presentation of engineered adhesive ligands, instead relying on matrix remodelling to facilitate cadherin-mediated cell-cell contact and promote β-catenin signalling. In two additional hydrogel systems, permitting NPC-mediated matrix remodelling proved to be a generalizable strategy for stemness maintenance in 3D. Our findings have identified matrix remodelling, in the absence of cytoskeletal tension generation, as a previously unknown strategy to maintain stemness in 3D.
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Affiliation(s)
| | - Bauer L. LeSavage
- Department of Bioengineering, Stanford University, Stanford, CA 94305
| | - Ruby E. Dewi
- Department of Materials Science & Engineering, Stanford University, Stanford, CA 94305
| | - Cong B. Dinh
- Department of Materials Science & Engineering, Stanford University, Stanford, CA 94305
| | - Ryan S. Stowers
- Department of Mechanical Engineering, Stanford University, Stanford, CA 94305
| | | | - Kyle J. Lampe
- Department of Materials Science & Engineering, Stanford University, Stanford, CA 94305
- Department of Chemical Engineering, University of Virginia, Charlottesville, VA 22904
| | - Duong Nguyen
- Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg SE-412 96, Sweden
| | - Ovijit Chaudhuri
- Department of Mechanical Engineering, Stanford University, Stanford, CA 94305
| | - Annika Enejder
- Department of Materials Science & Engineering, Stanford University, Stanford, CA 94305
- Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg SE-412 96, Sweden
| | - Sarah C. Heilshorn
- Department of Materials Science & Engineering, Stanford University, Stanford, CA 94305
- Corresponding Author: Sarah C. Heilshorn, 476 Lomita Mall, McCullough Room 246, Stanford University, Stanford, CA 94305-4045, USA,
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23
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Application of Hydrogel in Reconstruction Surgery: Hydrogel/Fat Graft Complex Filler for Volume Reconstruction in Critical Sized Muscle Defects. BIOMED RESEARCH INTERNATIONAL 2016; 2016:3459431. [PMID: 27446947 PMCID: PMC4944025 DOI: 10.1155/2016/3459431] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 06/13/2016] [Indexed: 01/17/2023]
Abstract
Autogenic fat graft usually suffers from degeneration and volume shrinkage in volume reconstruction applications. How to maintain graft viability and graft volume is an essential consideration in reconstruction therapies. In this presented investigation, a new fat graft transplantation method was developed aiming to improve long term graft viability and volume reconstruction effect by incorporation of hydrogel. The harvested fat graft is dissociated into small fragments and incorporated into a collagen based hydrogel to form a hydrogel/fat graft complex for volume reconstruction purpose. In vitro results indicate that the collagen based hydrogel can significantly improve the survivability of cells inside isolated graft. In a 6-month investigation on artificial created defect model, this hydrogel/fat graft complex filler has demonstrated the ability of promoting fat pad formation inside the targeted defect area. The newly generated fat pad can cover the whole defect and restore its original dimension in 6-month time point. Compared to simple fat transplantation, this hydrogel/fat graft complex system provides much improvement on long term volume restoration effect against degeneration and volume shrinkage. One notable effect is that there is continuous proliferation of adipose tissue throughout the 6-month period. In summary, the hydrogel/fat graft system presented in this investigation demonstrated a better and more significant effect on volume reconstruction in large sized volume defect than simple fat transplantation.
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24
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Colosi C, Shin SR, Manoharan V, Massa S, Costantini M, Barbetta A, Dokmeci MR, Dentini M, Khademhosseini A. Microfluidic Bioprinting of Heterogeneous 3D Tissue Constructs Using Low-Viscosity Bioink. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:677-84. [PMID: 26606883 PMCID: PMC4804470 DOI: 10.1002/adma.201503310] [Citation(s) in RCA: 517] [Impact Index Per Article: 64.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 10/03/2015] [Indexed: 04/14/2023]
Abstract
A novel bioink and a dispensing technique for 3D tissue-engineering applications are presented. The technique incorporates a coaxial extrusion needle using a low-viscosity cell-laden bioink to produce highly defined 3D biostructures. The extrusion system is then coupled to a microfluidic device to control the bioink arrangement deposition, demonstrating the versatility of the bioprinting technique. This low-viscosity cell-responsive bioink promotes cell migration and alignment within each fiber organizing the encapsulated cells.
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Affiliation(s)
- Cristina Colosi
- Biomaterials Innovation Research Center, Harvard Medical School, Brigham and Women's Hospital, Cambridge, MA, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, 02139, USA
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, Rome, 00185, Italy
| | - Su Ryon Shin
- Biomaterials Innovation Research Center, Harvard Medical School, Brigham and Women's Hospital, Cambridge, MA, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Boston, MA, 02115, USA
| | - Vijayan Manoharan
- Biomaterials Innovation Research Center, Harvard Medical School, Brigham and Women's Hospital, Cambridge, MA, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, 02139, USA
| | - Solange Massa
- Biomaterials Innovation Research Center, Harvard Medical School, Brigham and Women's Hospital, Cambridge, MA, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, 02139, USA
- Programa de Doctorado en Biomedicina, Universidad de los Andes, Santiago, 7620001, Chile
| | - Marco Costantini
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, Rome, 00185, Italy
| | - Andrea Barbetta
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, Rome, 00185, Italy
| | - Mehmet Remzi Dokmeci
- Biomaterials Innovation Research Center, Harvard Medical School, Brigham and Women's Hospital, Cambridge, MA, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Boston, MA, 02115, USA
| | - Mariella Dentini
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, Rome, 00185, Italy
| | - Ali Khademhosseini
- Biomaterials Innovation Research Center, Harvard Medical School, Brigham and Women's Hospital, Cambridge, MA, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Boston, MA, 02115, USA
- Department of Bioindustrial Technologies, College of Animal Bioscience and Technology, Konkuk University, Hwayang-dong, Kwangjin-gu, Seoul, 143-701, Republic of Korea
- Department of Physics, King Abdulaziz University, Jeddah, 21569, Saudi Arabia
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25
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Chee PL, Lakshmanan L, Jiang S, Ye H, Kai D, Loh XJ. An Injectable Double-Network Hydrogel for Cell Encapsulation. Aust J Chem 2016. [DOI: 10.1071/ch15659] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Further developing on the technique originally intended for the purpose of forming tough hydrogels, we showed in this study that the double-network system can also be used to synthesize an injectable gel. The gel was made up of poly(ethylene glycol) methyl ether methacrylate, sodium alginic acid, and calcium chloride, and two networks, consisting of ionic and covalent networks, were found to co-exist in the gel. Additionally, the rheology studies showed that the mechanical properties of the gel only deteriorated under high strain, demonstrating the robustness of the gel upon injection. The results of a cell cytotoxicity test and a preliminary cell encapsulation study were promising, showing good cell compatibility and thus suggesting that the hydrogels could potentially be used for cell delivery.
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26
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Sivashanmugam A, Arun Kumar R, Vishnu Priya M, Nair SV, Jayakumar R. An overview of injectable polymeric hydrogels for tissue engineering. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.05.014] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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27
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Vaicik MK, Morse M, Blagajcevic A, Rios J, Larson J, Yang F, Cohen RN, Papavasiliou G, Brey EM. Hydrogel-Based Engineering of Beige Adipose Tissue. J Mater Chem B 2015; 3:7903-7911. [PMID: 26693015 PMCID: PMC4675174 DOI: 10.1039/c5tb00952a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Brown and beige adipose tissues have a significant capacity for energy expenditure that may be exploited as a treatment for obesity and metabolic disease. However, the limited volumes of these tissues in adults hinders realization of this potential. Engineering beige adipose tissue may provide an alternative source of this tissue. In this paper we describe the preparation of poly(ethylene glycol) (PEGDA) hydrogels with mechanical properties similar to native adipose tissue. Adipose derived stem cells (ASC) were cultured in hydrogels without adhesive sequences or degradable monomers. Cells were able to differentiate, independent of scaffold properties and were maintained as a viable and functioning adipose tissue mass. The cells expressed their own basement membrane proteins consistent with the composition of adipose tissue. The ASCs could be induced to express uncoupling protein-1 (UCP-1) and cIDEA, makers of beige adipocytes with expression level varying with hydrogel stiffness. This hydrogel-based culture system serves as a first step in engineering beige adipose tissue.
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Affiliation(s)
- M K Vaicik
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL ; Research Service, Veteran Affairs Hospital, Hines, IL
| | - M Morse
- Section of Endocrinology, Department of Medicine, University of Chicago, Chicago, IL
| | - A Blagajcevic
- Section of Endocrinology, Department of Medicine, University of Chicago, Chicago, IL
| | - J Rios
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL
| | - J Larson
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL
| | - F Yang
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL
| | - R N Cohen
- Section of Endocrinology, Department of Medicine, University of Chicago, Chicago, IL
| | - G Papavasiliou
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL
| | - E M Brey
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL ; Research Service, Veteran Affairs Hospital, Hines, IL
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28
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Zhang Q, Hubenak J, Iyyanki T, Alred E, Turza KC, Davis G, Chang EI, Branch-Brooks CD, Beahm EK, Butler CE. Engineering vascularized soft tissue flaps in an animal model using human adipose-derived stem cells and VEGF+PLGA/PEG microspheres on a collagen-chitosan scaffold with a flow-through vascular pedicle. Biomaterials 2015; 73:198-213. [PMID: 26410787 DOI: 10.1016/j.biomaterials.2015.09.024] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 09/04/2015] [Accepted: 09/09/2015] [Indexed: 12/23/2022]
Abstract
Insufficient neovascularization is associated with high levels of resorption and necrosis in autologous and engineered fat grafts. We tested the hypothesis that incorporating angiogenic growth factor into a scaffold-stem cell construct and implanting this construct around a vascular pedicle improves neovascularization and adipogenesis for engineering soft tissue flaps. Poly(lactic-co-glycolic-acid/polyethylene glycol (PLGA/PEG) microspheres containing vascular endothelial growth factor (VEGF) were impregnated into collagen-chitosan scaffolds seeded with human adipose-derived stem cells (hASCs). This setup was analyzed in vitro and then implanted into isolated chambers around a discrete vascular pedicle in nude rats. Engineered tissue samples within the chambers were harvested and analyzed for differences in vascularization and adipose tissue growth. In vitro testing showed that the collagen-chitosan scaffold provided a supportive environment for hASC integration and proliferation. PLGA/PEG microspheres with slow-release VEGF had no negative effect on cell survival in collagen-chitosan scaffolds. In vivo, the system resulted in a statistically significant increase in neovascularization that in turn led to a significant increase in adipose tissue persistence after 8 weeks versus control constructs. These data indicate that our model-hASCs integrated with a collagen-chitosan scaffold incorporated with VEGF-containing PLGA/PEG microspheres supported by a predominant vascular vessel inside a chamber-provides a promising, clinically translatable platform for engineering vascularized soft tissue flap. The engineered adipose tissue with a vascular pedicle could conceivably be transferred as a vascularized soft tissue pedicle flap or free flap to a recipient site for the repair of soft-tissue defects.
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Affiliation(s)
- Qixu Zhang
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
| | - Justin Hubenak
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Tejaswi Iyyanki
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Erik Alred
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Kristin C Turza
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Greg Davis
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Edward I Chang
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Cynthia D Branch-Brooks
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Elisabeth K Beahm
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Charles E Butler
- Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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29
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Huber B, Borchers K, Tovar GE, Kluger PJ. Methacrylated gelatin and mature adipocytes are promising components for adipose tissue engineering. J Biomater Appl 2015; 30:699-710. [PMID: 26017717 DOI: 10.1177/0885328215587450] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In vitro engineering of autologous fatty tissue constructs is still a major challenge for the treatment of congenital deformities, tumor resections or high-graded burns. In this study, we evaluated the suitability of photo-crosslinkable methacrylated gelatin (GM) and mature adipocytes as components for the composition of three-dimensional fatty tissue constructs. Cytocompatibility evaluations of the GM and the photoinitiator Lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP) showed no cytotoxicity in the relevant range of concentrations. Matrix stiffness of cell-laden hydrogels was adjusted to native fatty tissue by tuning the degree of crosslinking and was shown to be comparable to that of native fatty tissue. Mature adipocytes were then cultured for 14 days within the GM resulting in a fatty tissue construct loaded with viable cells expressing cell markers perilipin A and laminin. This work demonstrates that mature adipocytes are a highly valuable cell source for the composition of fatty tissue equivalents in vitro. Photo-crosslinkable methacrylated gelatin is an excellent tissue scaffold and a promising bioink for new printing techniques due to its biocompatibility and tunable properties.
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Affiliation(s)
- Birgit Huber
- Institute of Interfacial Process Engineering and Plasma Technology, University of Stuttgart, Stuttgart, Germany
| | - Kirsten Borchers
- Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, Nobelstraße, Stuttgart, Germany
| | - Günter Em Tovar
- Institute of Interfacial Process Engineering and Plasma Technology, University of Stuttgart, Stuttgart, Germany Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, Nobelstraße, Stuttgart, Germany
| | - Petra J Kluger
- Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, Nobelstraße, Stuttgart, Germany Reutlingen University, Process Analysis & Technology (PA&T), Alteburgstraße, Reutlingen, Germany
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Turner PA, Tang Y, Weiss SJ, Janorkar AV. Three-dimensional spheroid cell model of in vitro adipocyte inflammation. Tissue Eng Part A 2015; 21:1837-47. [PMID: 25781458 DOI: 10.1089/ten.tea.2014.0531] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
To improve treatment of obesity, a contributing factor to multiple systemic and metabolic diseases, a better understanding of metabolic state and environmental stress at the cellular level is essential. This work presents development of a three-dimensional (3D) in vitro model of adipose tissue displaying induced lipid accumulation as a function of fatty acid supplementation that, subsequently, investigates cellular responses to a pro-inflammatory stimulus, thereby recapitulating key stages of obesity progression. Three-dimensional spheroid organization of adipose cells was induced by culturing 3T3-L1 mouse preadipocytes on an elastin-like polypeptide-polyethyleneimine (ELP-PEI)-coated surface. Results indicate a more differentiated phenotype in 3D spheroid cultures relative to two-dimensional (2D) monolayer analogues based on triglyceride accumulation, CD36 and CD40 protein expression, and peroxisome proliferator-activated receptor-γ (PPAR-γ) and adiponectin mRNA expression. The 3T3-L1 adipocyte spheroid model was then used to test the effects of a pro-inflammatory microenvironment, namely maturation in the presence of elevated fatty acid levels followed by acute exposure to tumor necrosis factor alpha (TNF-α). Under these conditions, we demonstrate that metabolic function was reduced across all cultures exposed to TNF-α, especially so when pre-exposed to linoleic acid. Further, in response to TNF-α, enhanced lipolysis, monitored as increased extracellular glycerol and fatty acids levels, was observed in adipocytes cultured in the presence of exogenous fatty acids. Taken together, our 3D spheroid model showed enhanced adipogenic differentiation and presents a platform for elucidating the key phenotypic responses that occur in pro-inflammatory microenvironments that characterize obesogenic states.
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Affiliation(s)
- Paul A Turner
- 1Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, Jackson, Mississippi
| | - Yi Tang
- 2Life Sciences Institute, University of Michigan, Ann Arbor, Michigan
| | - Stephen J Weiss
- 2Life Sciences Institute, University of Michigan, Ann Arbor, Michigan
| | - Amol V Janorkar
- 1Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, Jackson, Mississippi
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31
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Fonseca KB, Granja PL, Barrias CC. Engineering proteolytically-degradable artificial extracellular matrices. Prog Polym Sci 2014. [DOI: 10.1016/j.progpolymsci.2014.07.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Lee HY, Yang HJ, Rhie JW, Han KT. Adipose tissue regeneration in vivo using micronized acellular allogenic dermis as an injectable scaffold. Aesthetic Plast Surg 2014; 38:1001-10. [PMID: 25099494 DOI: 10.1007/s00266-014-0379-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 06/05/2014] [Indexed: 11/30/2022]
Abstract
Over the past few years, the clinical use of injectable artificial materials in plastic surgery has increased. In addition, autologous lipoimplantation is being performed for volume replacement of soft tissue for aesthetic purposes. In this study, acellular allogenic dermis was utilized as a scaffold for the culturing of preadipocytes, confirming the possibility of three-dimensional proliferation of progenitor cells, the eventual differentiation of stromal cells in adipose tissue into the adipocytes, and the in vivo implantation of such adipocytes to form fat tissue. Preadipocytes, recently called ASCs (adipose tissue-derived stromal/stem cells), were cultured in acellular allogenic dermis, successfully attached to the dermal particles in a three-dimensional structure, and proliferated, differentiated, and eventually formed a cluster. For the in vivo implantation, four groups were formed: the first group was cultured within the dermal scaffold for 24 h before implantation (24-h preconditioned group), the second group was induced for differentiation for 10 days before implantation (10-day preconditioned group), the third group was implanted immediately after cell propagation (nonpreconditioned group), and the control group was implanted with only dermal scaffold. In vivo implanted preadipocytes showed great differentiation into adipocytes within the dermal scaffolds. Also, the 10-day preconditioned group showed a greater volume of fat tissue compared to the 24-h preconditioned group. From these results, we confirmed that after a three-dimensional culture in acellular allogenic dermis, implanted preadipocytes formed a greater amount of fat tissue and that this could be a possible effective method for future soft tissue restoration.
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Affiliation(s)
- Hee Young Lee
- Medikan, Human Tower B1F, 20-9 Jamwon-dong, Socho-ku, Seoul, South Korea
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Dingal PCDP, Discher DE. Material control of stem cell differentiation: challenges in nano-characterization. Curr Opin Biotechnol 2014; 28:46-50. [DOI: 10.1016/j.copbio.2013.11.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 10/31/2013] [Accepted: 11/01/2013] [Indexed: 11/25/2022]
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Kang M, Colombo JS, D’Souza RN, Hartgerink JD. Sequence effects of self-assembling multidomain peptide hydrogels on encapsulated SHED cells. Biomacromolecules 2014; 15:2004-11. [PMID: 24813237 PMCID: PMC4059253 DOI: 10.1021/bm500075r] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 04/27/2014] [Indexed: 01/08/2023]
Abstract
Here we report three new nanofibrous, self-assembling multidomain peptide (MDP) sequences and examine the effect of sequence on the morphology and expansion of encapsulated Stem cells from Human Exfoliated Deciduous teeth (SHED). We modified our previously reported set of serine-based MDPs, changing the serine residues in the amphiphilic region to threonine. The three new threonine-based sequences self-assemble into antiparallel β-sheet nanofibers, confirmed by CD and IR. AFM and negative-stained TEM show that the nanofibers formed by the new sequences are more curved than their serine-containing predecessors. Despite this change in nanofiber morphology, SEM illustrates that all three new sequences still form porous hydrogels. K(TL)2SLRG(TL)3KGRGDS, with a designed cleavage site, is able to be degraded by Matrix Metalloprotease 2. We then examine SHED cell response to these new sequences as well as their serine-based predecessors. We observe faster cell attachment and spreading in hydrogels formed by K2(SL)6K2GRGDS and K(SL)3RG(SL)3KGRGDS. By day 3, the SHEDs in all of the serine-based sequences exhibit a fibroblast-like morphology. Additionally, the SHED cells expand more rapidly in the serine-based gels while the cell number remains relatively constant in the threonine-based peptides. In hydrogels formed by K2(TL)6K2GRGDS and K(TL)2SLRG(TL)3KGRGDS, this low expansion rate is accompanied by changes in morphology where SHEDs exhibit a stellate morphology after 3 days in culture; however, by day 7 they appear more fibroblast-shaped. Throughout the duration of the experiment, the SHED cells encapsulated in the K2(TL)6K2 hydrogels remain rounded. These results suggest that the basic MDP structure easily accommodates modifications in sequence and, for SHED cells, the threonine-containing gels require the integrin-binding RGDS sequence for cell attachment to occur, while the serine-based gels are less selective and support an increase in cell number, regardless of the presence or absence of RGDS.
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Affiliation(s)
- Marci
K. Kang
- Departments of Chemistry and Bioengineering, Rice
University, Houston, Texas 77005, United
States
| | - John S. Colombo
- Departments of Chemistry and Bioengineering, Rice
University, Houston, Texas 77005, United
States
- School
of Dentistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Rena N. D’Souza
- School
of Dentistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Jeffrey D. Hartgerink
- Departments of Chemistry and Bioengineering, Rice
University, Houston, Texas 77005, United
States
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Abstract
With advancements in biological and engineering sciences, the definition of an ideal biomaterial has evolved over the past 50 years from a substance that is inert to one that has select bioinductive properties and integrates well with adjacent host tissue. Biomaterials are a fundamental component of tissue engineering, which aims to replace diseased, damaged, or missing tissue with reconstructed functional tissue. Most biomaterials are less than satisfactory for pediatric patients because the scaffold must adapt to the growth and development of the surrounding tissues and organs over time. The pediatric community, therefore, provides a distinct challenge for the tissue engineering community.
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Affiliation(s)
- Timothy J Keane
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Bridgeside Point 2, 450 Technology Drive, Pittsburgh, Pennsylvania 15219; Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Stephen F Badylak
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Bridgeside Point 2, 450 Technology Drive, Pittsburgh, Pennsylvania 15219; Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania.
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36
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Adipose-derived stromal cells for osteoarticular repair: trophic function versus stem cell activity. Expert Rev Mol Med 2014; 16:e9. [PMID: 24810570 PMCID: PMC4017835 DOI: 10.1017/erm.2014.9] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The identification of multipotent adipose-derived stromal cells (ASC) has raised hope that tissue regeneration approaches established with bone-marrow-derived stromal cells (BMSC) can be reproduced with a cell-type that is far more accessible in large quantities. Recent detailed comparisons, however, revealed subtle functional differences between ASC and BMSC, stressing the concept of a common mesenchymal progenitor existing in a perivascular niche across all tissues. Focussing on bone and cartilage repair, this review summarises recent in vitro and in vivo studies aiming towards tissue regeneration with ASC. Advantages of good accessibility, high yield and superior growth properties are counterbalanced by an inferiority of ASC to form ectopic bone and stimulate long-bone healing along with their less pronounced osteogenic and angiogenic gene expression signature. Hence, particular emphasis is placed on establishing whether stem cell activity of ASC is so far proven and relevant for successful osteochondral regeneration, or whether trophic activity may largely determine therapeutic outcome.
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38
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Browning MB, Cereceres SN, Luong PT, Cosgriff-Hernandez EM. Determination of the in vivo degradation mechanism of PEGDA hydrogels. J Biomed Mater Res A 2014; 102:4244-51. [PMID: 24464985 DOI: 10.1002/jbm.a.35096] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Revised: 01/02/2014] [Accepted: 01/21/2014] [Indexed: 12/28/2022]
Abstract
Poly(ethylene glycol) (PEG) hydrogels are one of the most extensively utilized biomaterials systems due to their established biocompatibility and highly tunable properties. It is widely acknowledged that traditional acrylate-derivatized PEG (PEGDA) hydrogels are susceptible to slow degradation in vivo and are therefore unsuitable for long-term implantable applications. However, there is speculation whether the observed degradation is due to hydrolysis of endgroup acrylate esters or oxidation of the ether backbone, both of which are possible in the foreign body response to implanted devices. PEG diacrylamide (PEGDAA) is a polyether-based hydrogel system with similar properties to PEGDA but with amide linkages in place of the acrylate esters. This provides a hydrolytically-stable control that can be used to isolate the relative contributions of hydrolysis and oxidation to the in vivo degradation of PEGDA. Here we show that PEGDAA hydrogels remained stable over 12 weeks of subcutaneous implantation in a rat model while PEGDA hydrogels underwent significant degradation as indicated by both increased swelling ratio and decreased modulus. As PEGDA and PEGDAA have similar susceptibility to oxidation, these results demonstrate for the first time that the primary in vivo degradation mechanism of PEGDA is hydrolysis of the endgroup acrylate esters. Additionally, the maintenance of PEGDAA hydrogel properties in vivo indicates their suitability for long-term implants. These studies serve to elucidate key information about a widely used biomaterial system to allow for better implantable device design and to provide a biostable replacement option for PEGDA in applications that require long-term stability.
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Affiliation(s)
- M B Browning
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas, 77843-3120
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39
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Tanzi MC, Farè S. Adipose tissue engineering: state of the art, recent advances and innovative approaches. Expert Rev Med Devices 2014; 6:533-51. [DOI: 10.1586/erd.09.37] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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40
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Shin SR, Aghaei-Ghareh-Bolagh B, Dang TT, Topkaya SN, Gao X, Yang SY, Jung SM, Oh JH, Dokmeci MR, Tang X(S, Khademhosseini A. Cell-laden microengineered and mechanically tunable hybrid hydrogels of gelatin and graphene oxide. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:6385-91. [PMID: 23996513 PMCID: PMC3898458 DOI: 10.1002/adma.201301082] [Citation(s) in RCA: 197] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2013] [Revised: 05/21/2013] [Indexed: 05/19/2023]
Abstract
Incorporating graphene oxide inside GelMA hydrogels enhances their mechanical properties and reduces UV-induced cell damage while preserving their favorable characteristics for 3D cell encapsulation. NIH-3T3 fibroblasts encapsulated in GO-GelMA microgels demonstrate excellent cellular viability, proliferation, spreading, and alignment. GO reinforcement combined with a multi-stacking approach offers a facile engineering strategy for the construction of complex artificial tissues.
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Affiliation(s)
- Su Ryon Shin
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02139, USA
| | - Behnaz Aghaei-Ghareh-Bolagh
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Cell and Molecular Biology, Uppsala University, SE-751 24 Uppsala, Sweden
| | - Tram T. Dang
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, MA 02139, USA
| | - Seda Nur Topkaya
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Analytical Chemistry, Faculty of Pharmacy, Ege University, 35100 Bornova, Izmir, Turkey
| | - Xiguang Gao
- Department of Chemistry & Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. West, Waterloo, Ontario, N2L 3G1, Canada
| | - Seung Yun Yang
- Center for Regenerative Therapeutics & Department of Medicine, Division of Biomedical Engineering, Brigham and Women’s Hospital, 65 Landsdowne Street, Cambridge, MA 02139, USA
| | - Sung Mi Jung
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Jong Hyun Oh
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Mehmet R. Dokmeci
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02139, USA
| | - Xiaowu (Shirley) Tang
- Department of Chemistry & Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. West, Waterloo, Ontario, N2L 3G1, Canada
| | - Ali Khademhosseini
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02139, USA
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41
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Turner PA, Harris LM, Purser CA, Baker RC, Janorkar AV. A surface-tethered spheroid model for functional evaluation of 3T3-L1 adipocytes. Biotechnol Bioeng 2013; 111:174-83. [PMID: 24038000 DOI: 10.1002/bit.25099] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 08/07/2013] [Accepted: 08/13/2013] [Indexed: 11/08/2022]
Abstract
In order to effectively treat obesity, it must be better understood at the cellular level with respect to metabolic state and environmental stress. However, current two-dimensional (2D) in vitro cell culture methods do not represent the in vivo adipose tissue appropriately due to the absence of complex architecture and cellular signaling. Conversely, 3D in vitro cultures have been reported to have optimal results mimicking the adipose tissue in vivo. The main aim of this study was to examine the efficacy of a novel conjugate of a genetically engineered polymer, elastin-like polypeptide (ELP) and a synthetic polymer, polyethyleneimine (PEI), toward creating a 3D preadipocyte culture system. We then used this 3D culture model to study the preadipocyte differentiation and adipocyte maintenance processes when subjected to various dosages of nutritionally relevant free fatty acids with respect to total DNA and protein content, cell viability, and intracellular triglyceride accumulation. Our results showed that 3T3-L1 preadipocytes cultured on the ELP-PEI surface formed 3D spheroids within 72 h, whereas the cells cultured on unmodified tissue culture polystyrene surfaces remained in monolayer configuration. Significant statistical differences were discovered between the 3D spheroid and 2D monolayer culture with respect to the DNA and protein content, fatty acid consumption, and triglyceride accumulation, indicating differences in cellular response. Results indicated that the 3D culture may be a more sensitive modeling technique for in vitro adipocyte culture and provides a platform for future evaluation of 3D in vitro adipocyte function.
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Affiliation(s)
- Paul A Turner
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, 2500 North State Street, Jackson, Mississippi, 39216
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Malda J, Visser J, Melchels FP, Jüngst T, Hennink WE, Dhert WJA, Groll J, Hutmacher DW. 25th anniversary article: Engineering hydrogels for biofabrication. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:5011-28. [PMID: 24038336 DOI: 10.1002/adma.201302042] [Citation(s) in RCA: 1087] [Impact Index Per Article: 98.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Revised: 06/19/2013] [Indexed: 05/19/2023]
Abstract
With advances in tissue engineering, the possibility of regenerating injured tissue or failing organs has become a realistic prospect for the first time in medical history. Tissue engineering - the combination of bioactive materials with cells to generate engineered constructs that functionally replace lost and/or damaged tissue - is a major strategy to achieve this goal. One facet of tissue engineering is biofabrication, where three-dimensional tissue-like structures composed of biomaterials and cells in a single manufacturing procedure are generated. Cell-laden hydrogels are commonly used in biofabrication and are termed "bioinks". Hydrogels are particularly attractive for biofabrication as they recapitulate several features of the natural extracellular matrix and allow cell encapsulation in a highly hydrated mechanically supportive three-dimensional environment. Additionally, they allow for efficient and homogeneous cell seeding, can provide biologically-relevant chemical and physical signals, and can be formed in various shapes and biomechanical characteristics. However, despite the progress made in modifying hydrogels for enhanced bioactivation, cell survival and tissue formation, little attention has so far been paid to optimize hydrogels for the physico-chemical demands of the biofabrication process. The resulting lack of hydrogel bioinks have been identified as one major hurdle for a more rapid progress of the field. In this review we summarize and focus on the deposition process, the parameters and demands of hydrogels in biofabrication, with special attention to robotic dispensing as an approach that generates constructs of clinically relevant dimensions. We aim to highlight this current lack of effectual hydrogels within biofabrication and initiate new ideas and developments in the design and tailoring of hydrogels. The successful development of a "printable" hydrogel that supports cell adhesion, migration, and differentiation will significantly advance this exciting and promising approach for tissue engineering.
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Affiliation(s)
- Jos Malda
- Department of Orthopaedics, University Medical Center Utrecht, P.O. Box 85500, 3508, GA Utrecht, The Netherlands; Institute of Health and Biomedical Innovation, Queensland University of TechnologyKelvin Grove Urban Village, Brisbane, QLD 4059, Australia; Department of Equine Sciences, Faculty of Veterinary Sciences, Utrecht University, Yalelaan 112, 3584 CM, Utrecht, The Netherlands
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Swift J, Ivanovska IL, Buxboim A, Harada T, Dingal PCDP, Pinter J, Pajerowski JD, Spinler KR, Shin JW, Tewari M, Rehfeldt F, Speicher DW, Discher DE. Nuclear lamin-A scales with tissue stiffness and enhances matrix-directed differentiation. Science 2013; 341:1240104. [PMID: 23990565 DOI: 10.1126/science.1240104] [Citation(s) in RCA: 1295] [Impact Index Per Article: 117.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Tissues can be soft like fat, which bears little stress, or stiff like bone, which sustains high stress, but whether there is a systematic relationship between tissue mechanics and differentiation is unknown. Here, proteomics analyses revealed that levels of the nucleoskeletal protein lamin-A scaled with tissue elasticity, E, as did levels of collagens in the extracellular matrix that determine E. Stem cell differentiation into fat on soft matrix was enhanced by low lamin-A levels, whereas differentiation into bone on stiff matrix was enhanced by high lamin-A levels. Matrix stiffness directly influenced lamin-A protein levels, and, although lamin-A transcription was regulated by the vitamin A/retinoic acid (RA) pathway with broad roles in development, nuclear entry of RA receptors was modulated by lamin-A protein. Tissue stiffness and stress thus increase lamin-A levels, which stabilize the nucleus while also contributing to lineage determination.
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Affiliation(s)
- Joe Swift
- Molecular and Cell Biophysics Laboratory, University of Pennsylvania, Philadelphia, PA 19104, USA
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Shoham N, Sasson AL, Lin FH, Benayahu D, Haj-Ali R, Gefen A. The mechanics of hyaluronic acid/adipic acid dihydrazide hydrogel: towards developing a vessel for delivery of preadipocytes to native tissues. J Mech Behav Biomed Mater 2013; 28:320-31. [PMID: 24021174 DOI: 10.1016/j.jmbbm.2013.08.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 07/28/2013] [Accepted: 08/05/2013] [Indexed: 11/28/2022]
Abstract
Promising treatment approaches in repairing tissue defects include implementation of regenerative medicine strategies, particularly delivery of preadipocytes to sites where adipose tissue damage needs to be repaired or where fat needs to be generated. In this study, we suggest that the injectable hyaluronic acid/adipic acid dihydrazide (HA/ADH) hydrogel may be an adipose-tissue-like material in terms of biological compatibility as well as mechanical behavior. First, we show that the hydrogel enables and supports growth, proliferation and differentiation of 3T3-L1 preadipocytes. Second, given that adipose tissue is a weight-bearing biological structure, we investigate the large deformation mechanical behavior of the hydrogel with and without embedded preadipocytes, by performing confined and unconfined compression tests and then calibrating a strain energy density (SED) function to the results. Four test groups were examined: (1) Hydrogel specimens right after the preparation without cells, (2) and (3) 3-days-cultured hydrogel specimens with and without cells, respectively, and (4) 6-days-cultured hydrogel specimens with cells. A one-term Ogden SED was found to adequately describe the hyperelastic behavior of the hydrogel specimens in all experimental groups. Importantly, we found that the mechanical properties of the hydrogel, when subjected to compression, are in good agreement with those of native adipose tissue, with the better fit occurring 3-6 days after preparation of the hydrogel. Third, computational finite element studies of the mechanical (stress-strain) behavior of the HA/ADH hydrogel when containing mature adipocytes indicated that the stiffnesses of the constructs were mildly affected by the presence of the adipocytes. Hence, we conclude that injectable HA/ADH hydrogel may serve as a vessel for protecting preadipocytes during, and at a short-term after delivery to native tissues, e.g. in research towards regenerative medicine in tissue reconstructions.
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Affiliation(s)
- Naama Shoham
- Department of Biomedical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel
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45
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Li L, Tong Z, Jia X, Kiick KL. Resilin-Like Polypeptide Hydrogels Engineered for Versatile Biological Functions. SOFT MATTER 2013; 9:665-673. [PMID: 23505396 PMCID: PMC3595062 DOI: 10.1039/c2sm26812d] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Natural resilin, the rubber-like protein that exists in specialized compartments of most arthropods, possesses excellent mechanical properties such as low stiffness, high resilience and effective energy storage. Recombinantly-engineered resilin-like polypeptides (RLPs) that possess the favorable attributes of native resilin would be attractive candidates for the modular design of biomaterials for engineering mechanically active tissues. Based on our previous success in creating a novel RLP-based hydrogel and demonstrating useful mechanical and cell-adhesive properties, we have produced a suite of new RLP-based constructs, each equipped with 12 repeats of the putative resilin consensus sequence and a single, distinct biologically active domain. This approach allows independent control over the concentrations of cell-binding, MMP-sensitive, and polysaccharide-sequestration domains in hydrogels comprising mixtures of the various RLPs. The high purity, molecular weight and correct compositions of each new polypeptide have been confirmed via high performance liquid chromatography (HPLC), sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS), and amino acid analysis. These RLP-based polypeptides exhibit largely random-coil conformation, both in solution and in the cross-linked hydrogels, as indicated by circular dichroic and infrared spectroscopic analyses. Hydrogels of various compositions, with a range of elastic moduli (1kPa to 25kPa) can be produced from these polypeptides, and the activity of the cell-binding and matrix metalloproteinase (MMP) sensitive domains was confirmed. Tris(hydroxymethyl phosphine) cross-linked RLP hydrogels were able to maintain their mechanical integrity as well as the viability of encapsulated primary human mesenchymal stem cells (MSCs). These results validate the promising properties of these RLP-based elastomeric biomaterials.
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Affiliation(s)
- Linqing Li
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware,19716,USA
| | - Zhixiang Tong
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware,19716,USA
| | - Xinqiao Jia
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware,19716,USA
- Department of Biomedical Engineering, University of Delaware, Newark, Delaware,19716,USA
- Delaware Biotechnology Institute, 15 Innovation Way, Newark, Delaware,19711,USA
| | - Kristi L. Kiick
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware,19716,USA
- Department of Biomedical Engineering, University of Delaware, Newark, Delaware,19716,USA
- Delaware Biotechnology Institute, 15 Innovation Way, Newark, Delaware,19711,USA
- 212 DuPont Hall, Department of Materials Science and Engineering, University of Delaware, Newark, Delaware, USA. Fax: +1-302-831- 4545; Tel: +1-302-831- 0201;
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Mironi-Harpaz I, Wang DY, Venkatraman S, Seliktar D. Photopolymerization of cell-encapsulating hydrogels: crosslinking efficiency versus cytotoxicity. Acta Biomater 2012; 8:1838-48. [PMID: 22285429 DOI: 10.1016/j.actbio.2011.12.034] [Citation(s) in RCA: 223] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Revised: 12/17/2011] [Accepted: 12/30/2011] [Indexed: 11/16/2022]
Abstract
Cell-encapsulating hydrogels used in regenerative medicine are designed to undergo a rapid liquid-to-solid phase transition in the presence of cells and tissues so as to maximize crosslinking and minimize cell toxicity. Light-activated free-radical crosslinking (photopolymerization) is of particular interest in this regard because it can provide rapid reaction rates that result in uniform hydrogel properties with excellent temporal and spatial control features. Among the many initiator systems available for photopolymerization, only a few have been identified as suitable for cell-based hydrogel formation owing to their water solubility, crosslinking properties and non-toxic reaction conditions. In this study, three long-wave ultraviolet (UV) light-activtied photoinitiators (PIs) were comparatively tested in terms of cytotoxicity, crosslinking efficiency and crosslinking kinetics of cell-encapsulating hydrogels. The hydrogels were photopolymerized from poly(ethylene glycol) (PEG) diacrylate or PEG-fibrinogen precursors using Irgacure® PIs I2959, I184 and I651, as well as with a chemical initiator/accelerator (APS/TEMED). The study specifically evaluated the PI type, PI concentration and UV light intensity, and how these affected the mechanical properties of the hydrogel (i.e. maximum storage modulus), the crosslinking reaction times and the reaction's cytotoxicity to encapsulated cells. Only two initiators (I2959 and I184) were identified as being suitable for achieving both high cell viability and efficient crosslinking of the cell-encapsulating hydrogels during the photopolymerization reaction. Optimization of PI concentration or irradiation intensity was particularly important for achieving maximum mechanical properties; a sub-optimal choice of PI concentration or irradiation intensity resulted in a substantial reduction in hydrogel modulus. Cytocompatibility may be compromised by unnecessarily prolonging exposure to cytotoxic free radicals or inadvertently enhancing the instantaneous dose of radicals in solution, both of which are dependent on the PI type/concentration and irradiation intensity. In the absence of a radical initiator, the short exposures to long-wave UV light irradiation (up to 5 min, 20 mW cm(-2), 365 nm) did not prove to be cytotoxic to cells. Therefore, it is important to understand the relationship between PIs, light irradiation conditions and crosslinking when attempting to identify a suitable hydrogel formation process for cell encapsulating hydrogels.
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Affiliation(s)
- Iris Mironi-Harpaz
- Faculty of Biomedical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
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Hynd MR, Turner JN, Shain W. Applications of hydrogels for neural cell engineering. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 18:1223-44. [DOI: 10.1163/156856207782177909] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Matthew R. Hynd
- a Laboratory of Nervous System Disorders, Wadsworth Center, P.O. Box 509, Empire State Plaza, Albany, NY 12201-0509, USA
| | - James N. Turner
- b Laboratory of Nervous System Disorders, Wadsworth Center, P.O. Box 509, Empire State Plaza, Albany, NY 12201-0509, USA
| | - William Shain
- c Laboratory of Nervous System Disorders, Wadsworth Center, P.O. Box 509, Empire State Plaza, Albany, NY 12201-0509, USA
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Bartlett RL, Medow MR, Panitch A, Seal B. Hemocompatible Poly(NIPAm-MBA-AMPS) Colloidal Nanoparticles as Carriers of Anti-inflammatory Cell Penetrating Peptides. Biomacromolecules 2012; 13:1204-11. [PMID: 22452800 DOI: 10.1021/bm300173x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Rush L Bartlett
- Weldon School of Biomedical Engineering, Purdue University, 206 South Martin Jischke Drive,
West Lafayette, Indiana, 47907
| | - Matthew R. Medow
- Weldon School of Biomedical Engineering, Purdue University, 206 South Martin Jischke Drive,
West Lafayette, Indiana, 47907
| | - Alyssa Panitch
- Weldon School of Biomedical Engineering, Purdue University, 206 South Martin Jischke Drive,
West Lafayette, Indiana, 47907
| | - Brandon Seal
- Weldon School of Biomedical Engineering, Purdue University, 206 South Martin Jischke Drive,
West Lafayette, Indiana, 47907
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Browning MB, Cosgriff-Hernandez E. Development of a biostable replacement for PEGDA hydrogels. Biomacromolecules 2012; 13:779-86. [PMID: 22324325 DOI: 10.1021/bm201707z] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The exceptional tunability of poly(ethylene glycol) (PEG) hydrogel chemical, mechanical, and biological properties enables their successful use in a wide range of biomedical applications. Although PEG diacrylate (PEGDA) hydrogels are often used as nondegradable controls in short-term in vitro studies, it is widely acknowledged that the hydrolytically labile esters formed upon acrylation of the PEG diol make them susceptible to slow degradation in vivo. A PEG hydrogel system that maintains the desirable properties of PEGDA while improving biostability would be valuable in preventing degradation-related failure of gel-based devices in long-term in vivo applications. To this end, PEG diacrylamide (PEGDAA) hydrogels were synthesized and characterized in quantitative comparison to traditional PEGDA hydrogels. It was found that PEGDAA hydrogel modulus and swelling can be tuned over a similar range and to comparable degrees as PEGDA hydrogels with changes in macromer molecular weight and concentration. Additionally, PEGDAA cytocompatibility, low cell adhesion, and capacity for incorporation of bioactivity were analogous to that of PEGDA. In vitro hydrolytic degradation studies showed that the amide-based PEGDAA had significantly increased biostability relative to PEGDA. Overall, these findings indicate that PEGDAA hydrogels are a suitable replacement for PEGDA hydrogels with enhanced hydrolytic resistance. In addition, these studies provide a quantitative measure of the hydrolytic degradation rate of PEGDA hydrogels which was previously lacking in the literature.
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Affiliation(s)
- Mary Beth Browning
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843-3120, United States
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Shin SR, Bae H, Cha JM, Mun JY, Chen YC, Tekin H, Shin H, Zarabi S, Dokmeci MR, Tang S, Khademhosseini A. Carbon nanotube reinforced hybrid microgels as scaffold materials for cell encapsulation. ACS NANO 2012; 6:362-72. [PMID: 22117858 PMCID: PMC3401631 DOI: 10.1021/nn203711s] [Citation(s) in RCA: 301] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Hydrogels that mimic biological extracellular matrix (ECM) can provide cells with mechanical support and signaling cues to regulate their behavior. However, despite the ability of hydrogels to generate artificial ECM that can modulate cellular behavior, they often lack the mechanical strength needed for many tissue constructs. Here, we present reinforced CNT-gelatin methacrylate (GelMA) hybrid as a biocompatible, cell-responsive hydrogel platform for creating cell-laden three-dimensional (3D) constructs. The addition of carbon nanotubes (CNTs) successfully reinforced GelMA hydrogels without decreasing their porosity or inhibiting cell growth. The CNT-GelMA hybrids were also photopatternable allowing for easy fabrication of microscale structures without harsh processes. NIH-3T3 cells and human mesenchymal stem cells (hMSCs) readily spread and proliferated after encapsulation in CNT-GelMA hybrid microgels. By controlling the amount of CNTs incorporated into the GelMA hydrogel system, we demonstrated that the mechanical properties of the hybrid material can be tuned making it suitable for various tissue engineering applications. Furthermore, due to the high pattern fidelity and resolution of CNT incorporated GelMA, it can be used for in vitro cell studies or fabricating complex 3D biomimetic tissue-like structures.
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Affiliation(s)
- Su Ryon Shin
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, 65 Landsdowne Street, Cambridge, Massachusetts 02139, USA
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