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Nakipoglu M, Özkabadayı Y, Karahan S, Tezcaner A. Bilayer wound dressing composed of asymmetric polycaprolactone membrane and chitosan-carrageenan hydrogel incorporating storax balsam. Int J Biol Macromol 2024; 254:128020. [PMID: 37956814 DOI: 10.1016/j.ijbiomac.2023.128020] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 11/08/2023] [Accepted: 11/09/2023] [Indexed: 11/15/2023]
Abstract
A comprehensive approach is needed to develop multifunctional wound dressing that is simple yet efficient. In this work, Liquidambar orientalis Mill. storax loaded hydroxyethyl chitosan (HECS)-carrageenan (kC) based hydrogel (HECS-kC) and polydopamine coated asymmetric polycaprolactone membrane (PCL-DOP) were used to develop a multifunctional and modular bilayer wound dressing. Asymmetric PCL-DOP membrane was prepared by non-solvent induced phase separation (NIPS) followed by polydopamine coating and demonstrated an excellent barrier against bacteria while allowing permeability for 5.45 ppm dissolved‑oxygen and 2130 g/m2 water vapor transmission in 24 h in addition to 805 kPa tensile strength. Storax loaded HECS-kC hydrogel, on the other hand, demonstrated a pH-responsive degradation and swelling to provide necessary conditions to facilitate wound healing. The hydrogels showed stretchability above 140 %, mild adhesive strength on sheep skin and PCL-DOP membrane, while the storax incorporation enhanced antibacterial and antioxidant activity. Furthermore, rat full-thickness skin defect model showed that the developed bilayer wound dressing could significantly facilitate wound healing compared to Tegaderm™ and control groups. This study shows that the bilayered wound dressing has the potential to be used as a simple and effective wound care system.
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Affiliation(s)
- Mustafa Nakipoglu
- Department of Biotechnology, Middle East Technical University, Ankara 06800, Turkey; Department of Molecular Biology and Genetics, Bartin University, Bartin 74100, Turkey.
| | - Yasin Özkabadayı
- Department of Histology, Kırıkkale University, Kırıkkale 71450, Turkey.
| | - Siyami Karahan
- Department of Histology, Kırıkkale University, Kırıkkale 71450, Turkey.
| | - Ayşen Tezcaner
- Department of Biotechnology, Middle East Technical University, Ankara 06800, Turkey; Department of Engineering Sciences, Middle East Technical University, Ankara 06800, Turkey.
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Progress and opportunities in Gellan gum-based materials: A review of preparation, characterization and emerging applications. Carbohydr Polym 2023; 311:120782. [PMID: 37028862 DOI: 10.1016/j.carbpol.2023.120782] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 02/27/2023] [Accepted: 02/28/2023] [Indexed: 03/08/2023]
Abstract
Gellan gum, a microbial exopolysaccharide, is biodegradable and has potential to fill several key roles in many fields from food to pharmacy, biomedicine and tissue engineering. In order to improve the physicochemical and biological properties of gellan gum, some researchers take advantage of numerous hydroxyl groups and the free carboxyl present in each repeating unit. As a result, design and development of gellan-based materials have advanced significantly. The goal of this review is to provide a summary of the most recent, high-quality research trends that have used gellan gum as a polymeric component in the design of numerous cutting-edge materials with applications in various fields.
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Huang H, Trentle M, Liu Z, Xiang K, Higgins W, Wang Y, Xue B, Yang S. Polymer Complex Fiber: Property, Functionality, and Applications. ACS APPLIED MATERIALS & INTERFACES 2023; 15:7639-7662. [PMID: 36719982 DOI: 10.1021/acsami.2c19583] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Polymer complex fibers (PCFs) are a novel kind of fiber material processed from polymer complexes that are assembled through noncovalent interactions. These can realize the synergy of functional components and miscibility on the molecular level. The dynamic character of noncovalent interactions endows PCFs with remarkable properties, such as reversibility, stimuli responsiveness, self-healing, and recyclability, enabling them to be applied in multidisciplinary fields. The objective of this article is to provide a review of recent progress in the field of PCFs. The classification based on chain interactions will be first introduced followed by highlights of the fabrication technologies and properties of PCFs. The effects of composition and preparation method on fiber properties are also discussed, with some emphasis on utilizing these for rational design. Finally, we carefully summarize recent advanced applications of PCFs in the fields of energy storage and sensors, water treatment, biomedical materials, artificial actuators, and biomimetic platforms. This review is expected to deepen the comprehension of PCF materials and open new avenues for developing PCFs with tailor-made properties for advanced application.
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Affiliation(s)
- Hao Huang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai201620, P. R. China
| | - Miranda Trentle
- Department of Chemistry, The University of Alabama at Birmingham, Birmingham, Alabama35294, United States
| | - Zexin Liu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai201620, P. R. China
| | - Kehui Xiang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai201620, P. R. China
| | - William Higgins
- Department of Chemistry, The University of Alabama at Birmingham, Birmingham, Alabama35294, United States
| | - Yunbing Wang
- National Engineering Research Center for Biomaterials and College of Biomedical Engineering, Sichuan University, Chengdu610064, P. R. China
| | - Bing Xue
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai201620, P. R. China
| | - Shuguang Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai201620, P. R. China
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4
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Patel A, Kosanovich J, Sansare S, Balmuri S, Sant V, Empey KM, Sant S. In vitro and in vivo evaluation of cerium oxide nanoparticles in respiratory syncytial virus infection. Bioact Mater 2022; 24:124-135. [PMID: 36606255 PMCID: PMC9791695 DOI: 10.1016/j.bioactmat.2022.12.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 11/23/2022] [Accepted: 12/06/2022] [Indexed: 12/23/2022] Open
Abstract
Respiratory syncytial virus (RSV) is the most common cause of viral bronchiolitis among children worldwide, yet there is no vaccine for RSV disease. This study investigates the potential of cube and sphere-shaped cerium oxide nanoparticles (CNP) to modulate reactive oxygen (ROS) and nitrogen (RNS) species and immune cell phenotypes in the presence of RSV infection in vitro and in vivo. Cube and sphere-shaped CNP were synthesized by hydrothermal and ultrasonication methods, respectively. Physico-chemical characterization confirmed the shape of sphere and cube CNP and effect of various parameters on their particle size distribution and zeta potential. In vitro results revealed that sphere and cube CNP differentially modulated ROS and RNS levels in J774 macrophages. Specifically, cube CNP significantly reduced RSV-induced ROS levels without affecting RNS levels while sphere CNP increased RSV-induced RNS levels with minimal effect on ROS levels. Cube CNP drove an M1 phenotype in RSV-infected macrophages in vitro by increasing macrophage surface expression of CD80 and CD86 with a concomitant increase in TNFα and IL-12p70, while simultaneously decreasing M2 CD206 expression. Intranasal administration of sphere and cube-CNP were well-tolerated with no observed toxicity in BALB/c mice. Notably, cube CNP preferentially accumulated in murine alveolar macrophages and induced their activation, avoiding enhanced uptake and activation of other inflammatory cells such as neutrophils, which are associated with RSV-mediated inflammation. In conclusion, we report that sphere and cube CNP modulate macrophage polarization and innate cellular responses during RSV infection.
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Key Words
- APTES, 3-aminopropyltriethoxysilane
- BAL, Bronchoalveolar lavage
- BHA, Butylated hydroxyanisole
- Bioactive nanoparticles
- CNP, Cerium oxide nanoparticles
- Cerium oxide nanoparticles
- DLS, Dynamic light scattering
- DMEM, Dulbecco's Modified Eagle's Medium
- FITC, Fluorescein isothiocyanate
- Gas6, Growth arrest specific-6
- HEPES, 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid
- Immunomodulation
- MFI, Mean fluorescence intensity
- Macrophage phenotypes
- Nanoparticle shape
- PBS, Phosphate buffered saline
- RFU, Relative fluorescence units
- RNS, Reactive nitrogen species
- ROS, Reactive oxygen species
- RSV, Respiratory syncytial virus
- Reactive oxygen species
- Respiratory syncytial virus
- SDS-PAGE, Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- SOD, Superoxide dismutase
- TEM, Transmission electron microscopy
- iNOS, Induced nitrous oxide synthase
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Affiliation(s)
- Akhil Patel
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Jessica Kosanovich
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Sameera Sansare
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Sricharani Balmuri
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Vinayak Sant
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Kerry M. Empey
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, 15261, USA,Center for Clinical Pharmaceutical Sciences, Department of Pharmacy and Therapeutics, School of Pharmacy, Clinical and Translational Science Institute, Department of Immunology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, 15261, USA,Corresponding author. 3501 Terrace Street, 207 Salk Pavilion, Pittsburgh, PA, 15261, USA.
| | - Shilpa Sant
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, 15261, USA,Department of Bioengineering, Swanson School of Engineering, McGowan Institute for Regenerative Medicine, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA, 15261, USA,Corresponding author. 700 Technology Drive, Pittsburgh Technology Center, Room 4307, Pittsburgh, PA, 15219, USA.
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Hu Y, Zhang S, Wen Z, Fu H, Hu J, Ye X, Kang L, Li X, Yang X. Oral delivery of curcumin via multi-bioresponsive polyvinyl alcohol and guar gum based double-membrane microgels for ulcerative colitis therapy. Int J Biol Macromol 2022; 221:806-820. [PMID: 36099999 DOI: 10.1016/j.ijbiomac.2022.09.050] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 08/21/2022] [Accepted: 09/06/2022] [Indexed: 11/05/2022]
Abstract
Anti-inflammatory drugs for ulcerative colitis (UC) treatment should specifically penetrate and accumulate in the colon tissue. Herein, a multi-bioresponsive anti-inflammatory drug (curcumin, CUR)-loaded heterogeneous double-membrane microgels (CUR@microgels) for oral administration was fabricated in this study, in which the inner core was derived from polyvinyl alcohol (PVA) and guar gum (GG) and the outer gel was decoration with alginate and chitosan by polyelectrolyte interactions. The structure and morphology of microgels were characterized. In vitro, the formulation exhibited good bio-responses at different pH conditions and sustained-release properties in simulated colon fluid with a drug-release rate of 84.6 % over 34 h. With the assistance of the outlayer gels, the microgels effectively delayed the premature drug release of CUR in the upper gastrointestinal tract. In vivo studies revealed that CUR@microgels specifically accumulated in the colon tissue for 24 h, which suggest that the interlayer gels were apt to reach colon lesion. As expected, the oral administration of microgels remarkably alleviated the symptoms of UC and protected the colon tissue in DSS-induced UC mice. The above results indicated that these facilely fabricated microgels which exhibited excellent biocompatibility and multi-bioresponsive drug release, had an apparent effect on the treatment of UC, which represents a promising drug delivery strategy for CUR in a clinical application.
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Affiliation(s)
- Yan Hu
- School of Pharmaceutical Science, South-Central MinZu University, Wuhan 430074, China; National Demonstration Center for Experimental Ethnopharmacology Education, South-Central MinZu University, Wuhan 430074, China; Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, South-Central MinZu University, Wuhan 430074, China.
| | - Shangwen Zhang
- School of Pharmaceutical Science, South-Central MinZu University, Wuhan 430074, China; National Demonstration Center for Experimental Ethnopharmacology Education, South-Central MinZu University, Wuhan 430074, China; Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, South-Central MinZu University, Wuhan 430074, China
| | - Zhijie Wen
- School of Pharmaceutical Science, South-Central MinZu University, Wuhan 430074, China; National Demonstration Center for Experimental Ethnopharmacology Education, South-Central MinZu University, Wuhan 430074, China; Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, South-Central MinZu University, Wuhan 430074, China
| | - Hudie Fu
- School of Pharmaceutical Science, South-Central MinZu University, Wuhan 430074, China; National Demonstration Center for Experimental Ethnopharmacology Education, South-Central MinZu University, Wuhan 430074, China; Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, South-Central MinZu University, Wuhan 430074, China
| | - Jie Hu
- School of Pharmaceutical Science, South-Central MinZu University, Wuhan 430074, China; National Demonstration Center for Experimental Ethnopharmacology Education, South-Central MinZu University, Wuhan 430074, China; Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, South-Central MinZu University, Wuhan 430074, China
| | - Xuexin Ye
- School of Pharmaceutical Science, South-Central MinZu University, Wuhan 430074, China; National Demonstration Center for Experimental Ethnopharmacology Education, South-Central MinZu University, Wuhan 430074, China; Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, South-Central MinZu University, Wuhan 430074, China
| | - Li Kang
- School of Pharmaceutical Science, South-Central MinZu University, Wuhan 430074, China; National Demonstration Center for Experimental Ethnopharmacology Education, South-Central MinZu University, Wuhan 430074, China; Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, South-Central MinZu University, Wuhan 430074, China
| | - Xiaojun Li
- School of Pharmaceutical Science, South-Central MinZu University, Wuhan 430074, China; National Demonstration Center for Experimental Ethnopharmacology Education, South-Central MinZu University, Wuhan 430074, China; Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, South-Central MinZu University, Wuhan 430074, China
| | - Xinzhou Yang
- School of Pharmaceutical Science, South-Central MinZu University, Wuhan 430074, China; National Demonstration Center for Experimental Ethnopharmacology Education, South-Central MinZu University, Wuhan 430074, China; Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, South-Central MinZu University, Wuhan 430074, China.
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6
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Bercea M. Bioinspired Hydrogels as Platforms for Life-Science Applications: Challenges and Opportunities. Polymers (Basel) 2022; 14:polym14122365. [PMID: 35745941 PMCID: PMC9229923 DOI: 10.3390/polym14122365] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/08/2022] [Accepted: 06/09/2022] [Indexed: 12/13/2022] Open
Abstract
Hydrogels, as interconnected networks (polymer mesh; physically, chemically, or dynamic crosslinked networks) incorporating a high amount of water, present structural characteristics similar to soft natural tissue. They enable the diffusion of different molecules (ions, drugs, and grow factors) and have the ability to take over the action of external factors. Their nature provides a wide variety of raw materials and inspiration for functional soft matter obtained by complex mechanisms and hierarchical self-assembly. Over the last decade, many studies focused on developing innovative and high-performance materials, with new or improved functions, by mimicking biological structures at different length scales. Hydrogels with natural or synthetic origin can be engineered as bulk materials, micro- or nanoparticles, patches, membranes, supramolecular pathways, bio-inks, etc. The specific features of hydrogels make them suitable for a wide variety of applications, including tissue engineering scaffolds (repair/regeneration), wound healing, drug delivery carriers, bio-inks, soft robotics, sensors, actuators, catalysis, food safety, and hygiene products. This review is focused on recent advances in the field of bioinspired hydrogels that can serve as platforms for life-science applications. A brief outlook on the actual trends and future directions is also presented.
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Affiliation(s)
- Maria Bercea
- "Petru Poni" Institute of Macromolecular Chemistry, 700487 Iasi, Romania
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7
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Sood A, Gupta A, Agrawal G. Recent advances in polysaccharides based biomaterials for drug delivery and tissue engineering applications. CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS 2021. [DOI: 10.1016/j.carpta.2021.100067] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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8
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Patel A, Zaky SH, Li H, Schoedel K, Almarza AJ, Sfeir C, Sant V, Sant S. Bottom-Up Self-assembled Hydrogel-Mineral Composites Regenerate Rabbit Ulna Defect without Added Growth Factors. ACS APPLIED BIO MATERIALS 2020; 3:5652-5663. [PMID: 35021797 DOI: 10.1021/acsabm.0c00371] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Hydrogel-based biomaterials have advanced bone tissue engineering approaches in the last decade, through their ability to serve as a carrier for potent growth factor, bone morphogenic protein-2 (BMP-2). However, biophysical properties of hydrogels such as multiscale structural hierarchy and bone extracellular matrix (ECM)-mimetic microarchitecture are underutilized while designing current bone grafts. Incorporation of these properties offers great potential to create a favorable biomimetic microenvironment to harness their regenerative potential. Here, we present our approach to fabricate collagen-inspired bioactive hydrogel scaffolds (referred to as "RegenMatrix") to guide and enhance bone regeneration in a rabbit ulna defect model through the mimicry of multiscale architecture of bone ECM, i.e., native collagen. Specifically, we employed polyelectrolyte complexation to promote bottom-up self-assembly of oppositely charged polysaccharides (chitosan and kappa-carrageenan) at multiple length scales forming fibrils, which further assemble into fibers. The self-assembly and bioinspired scaffold fabrication method resulted in robust cylindrical RegenMatrix with excellent retention of the multiscale architecture and uniform mineral deposition throughout the scaffolds. RegenMatrix, in both nonmineralized and mineralized forms, enhanced bone regeneration in the semiload-bearing ulna defect when compared to the empty defect. RegenMatrix also showed greater histocompatibility without any fibrous tissue formation. Collectively, the RegenMatrix developed in this study has a great potential as a bioactive bone graft without any added growth factors.
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Affiliation(s)
- Akhil Patel
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Samer H Zaky
- Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Hongshuai Li
- Musculoskeletal Growth & Regeneration Laboratory, Department of Orthopaedic Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Karen Schoedel
- Department of Pathology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Alejandro J Almarza
- Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.,Department of Bioengineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15219, United States.,McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania 15260, United States
| | - Charles Sfeir
- Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.,Department of Bioengineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15219, United States.,McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania 15260, United States
| | - Vinayak Sant
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Shilpa Sant
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.,Department of Bioengineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15219, United States.,McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania 15260, United States.,UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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9
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Patel A, Zaky SH, Schoedel K, Li H, Sant V, Beniash E, Sfeir C, Stolz DB, Sant S. Design and evaluation of collagen-inspired mineral-hydrogel nanocomposites for bone regeneration. Acta Biomater 2020; 112:262-273. [PMID: 32497742 DOI: 10.1016/j.actbio.2020.05.034] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 04/29/2020] [Accepted: 05/26/2020] [Indexed: 12/21/2022]
Abstract
Bone loss due to trauma and tumors remains a serious clinical concern. Due to limited availability and disease transmission risk with autografts and allografts, calcium phosphate bone fillers and growth factor-based substitute bone grafts are currently used in the clinic. However, substitute grafts lack bone regeneration potential when used without growth factors. When used along with the added growth factors, they lead to unwanted side effects such as uncontrolled bone growth. Collagen-based hydrogel grafts available on the market fail to provide structural guidance to native cells due to high water-solubility and faster degradation. To overcome these limitations, we employed bioinspired material design and fabricated three different hydrogels with structural features similar to native collagen at multiple length-scales. These hydrogels fabricated using polyionic complexation of oppositely charged natural polysaccharides exhibited multi-scale architecture mimicking nanoscale banding pattern, and microscale fibrous structure of native collagen. All three hydrogels promoted biomimetic apatite-like mineral deposition in vitro elucidating crystalline structure on the surface while amorphous calcium phosphate inside the hydrogels resulting in mineral-hydrogel nanocomposites. When evaluated in a non-load bearing critical size mouse calvaria defect model, chitosan - kappa carrageenan mineral-hydrogel nanocomposites enhanced bone regeneration without added growth factors compared to empty defect as well as widely used marketed collagen scaffolds. Histological assessment of the regenerated bone revealed improved healing and tissue remodeling with mineral-hydrogel nanocomposites. Overall, these collagen-inspired mineral-hydrogel nanocomposites showed multi-scale hierarchical structure and can potentially serve as promising bioactive hydrogel to promote bone regeneration. STATEMENT OF SIGNIFICANCE: Hydrogels, especially collagen, are widely used in bone tissue engineering. Collagen fibrils play arguably the most important role during natural bone development. Its multi-scale hierarchical structure to form fibers from fibrils and electrostatic charges enable mineral sequestration, nucleation, and growth. However, bulk collagen hydrogels exhibit limited bone regeneration and are mostly used as carriers for highly potent growth factors such as bone morphogenic protein-2, which increase the risk of uncontrolled bone growth. Thus, there is an unmet clinical need for a collagen-inspired biomaterial that can recreate structural hierarchy, mineral sequestration ability, and stimulate recruitment of host progenitor cells to facilitate bone regeneration. Here, we propose collagen-inspired bioactive mineral-hydrogel nanocomposites as a growth factor-free approach to guide and enhance bone regeneration.
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Affiliation(s)
- Akhil Patel
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA 15261
| | - Samer H Zaky
- Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA 15261
| | - Karen Schoedel
- Department of Pathology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261
| | - Hongshuai Li
- Musculoskeletal Growth & Regeneration Laboratory, Department of Orthopaedic Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261
| | - Vinayak Sant
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA 15261
| | - Elia Beniash
- Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA 15261; Department of Bioengineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA 15219; McGowan Institute for Regenerative Medicine, Pittsburgh, PA 15260
| | - Charles Sfeir
- Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA 15261; Department of Bioengineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA 15219; McGowan Institute for Regenerative Medicine, Pittsburgh, PA 15260
| | - Donna B Stolz
- Department of Pathology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261; McGowan Institute for Regenerative Medicine, Pittsburgh, PA 15260; Department of Cell Biology, University of Pittsburgh, Pittsburgh, PA 15260
| | - Shilpa Sant
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA 15261; Department of Bioengineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA 15219; McGowan Institute for Regenerative Medicine, Pittsburgh, PA 15260; UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA 15260.
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