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Cloyd AK, Boone K, Ye Q, Snead ML, Spencer P, Tamerler C. Engineered Peptides Enable Biomimetic Route for Collagen Intrafibrillar Mineralization. Int J Mol Sci 2023; 24:ijms24076355. [PMID: 37047325 PMCID: PMC10093982 DOI: 10.3390/ijms24076355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/07/2023] [Accepted: 03/16/2023] [Indexed: 03/30/2023] Open
Abstract
Overcoming the short lifespan of current dental adhesives remains a significant clinical need. Adhesives rely on formation of the hybrid layer to adhere to dentin and penetrate within collagen fibrils. However, the ability of adhesives to achieve complete enclosure of demineralized collagen fibrils is recognized as currently unattainable. We developed a peptide-based approach enabling collagen intrafibrillar mineralization and tested our hypothesis on a type-I collagen-based platform. Peptide design incorporated collagen-binding and remineralization-mediating properties using the domain structure conservation approach. The structural changes from representative members of different peptide clusters were generated for each functional domain. Common signatures associated with secondary structure features and the related changes in the functional domain were investigated by attenuated total reflectance Fourier-transform infrared (ATR-FTIR) and circular dichroism (CD) spectroscopy, respectively. Assembly and remineralization properties of the peptides on the collagen platforms were studied using atomic force microscopy (AFM). Mechanical properties of the collagen fibrils remineralized by the peptide assemblies was studied using PeakForce-Quantitative Nanomechanics (PF-QNM)-AFM. The engineered peptide was demonstrated to offer a promising route for collagen intrafibrillar remineralization. This approach offers a collagen platform to develop multifunctional strategies that combine different bioactive peptides, polymerizable peptide monomers, and adhesive formulations as steps towards improving the long-term prospects of composite resins.
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Affiliation(s)
- Aya K. Cloyd
- Bioengineering Program, University of Kansas, Lawrence, KS 66045, USA
- Institute for Bioengineering Research, University of Kansas, Lawrence, KS 66045, USA
| | - Kyle Boone
- Institute for Bioengineering Research, University of Kansas, Lawrence, KS 66045, USA
- Department of Mechanical Engineering, University of Kansas, Lawrence, KS 66045, USA
| | - Qiang Ye
- Institute for Bioengineering Research, University of Kansas, Lawrence, KS 66045, USA
| | - Malcolm L. Snead
- Center for Craniofacial Molecular Biology, Herman Ostrow School of Dentistry of USC, University of Southern California, Los Angeles, CA 90007, USA
| | - Paulette Spencer
- Bioengineering Program, University of Kansas, Lawrence, KS 66045, USA
- Institute for Bioengineering Research, University of Kansas, Lawrence, KS 66045, USA
- Department of Mechanical Engineering, University of Kansas, Lawrence, KS 66045, USA
| | - Candan Tamerler
- Bioengineering Program, University of Kansas, Lawrence, KS 66045, USA
- Institute for Bioengineering Research, University of Kansas, Lawrence, KS 66045, USA
- Department of Mechanical Engineering, University of Kansas, Lawrence, KS 66045, USA
- Correspondence:
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The influence of calcium fluoride nanoparticles’ addition on the bond integrity, degree of conversion, ion-release, and dentin interaction of an adhesive. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-021-02282-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Kumar D, Ghose D, Bolskar RD, Mutreja I, Jones RS. A novel methacrylate derivative polymer that resists bacterial cell-mediated biodegradation. J Biomed Mater Res B Appl Biomater 2021; 110:991-1000. [PMID: 34855282 DOI: 10.1002/jbm.b.34972] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 11/02/2021] [Accepted: 11/16/2021] [Indexed: 01/25/2023]
Abstract
This study tests biodegradation resistance of a custom synthesized novel ethylene glycol ethyl methacrylate (EGEMA) with ester bond linkages that are external to the central polymer backbone when polymerized. Ethylene glycol dimethacrylate (EGDMA) with internal ester bond linkages and EGEMA discs were prepared in a polytetrafluoroethylene (PTFE) mold using 40 μl macromer and photo/co-initiator mixture cured for 40 s at 1000 mW/cm2 . The discs were stored in the constant presence of Streptococcus mutans (S. mutans) in Todd Hewitt Yeast + Glucose (THYE+G) media up to 9 weeks (n = 8 for each macromer type) and physical/mechanical properties were assessed. Initial measurements EGEMA versus EGDMA polymer discs showed equivalent degree of conversion (45.69% ± 2.38 vs. 46.79% ± 4.64), diametral tensile stress (DTS; 8.12± 2.92 MPa vs. 6.02 ± 1.48 MPa), and low subsurface optical defects (0.41% ± 0.254% vs. 0.11% ± 0.074%). The initial surface wettability (contact angle) was slightly higher (p ≤ .012) for EGEMA (62.02° ± 3.56) than EGDMA (53.86° ± 5.61°). EGDMA showed higher initial Vicker's hardness than EGEMA (8.03 ± 0.88 HV vs. 5.93 ± 0.69 HV; p ≤ .001). After 9 weeks of S. mutans exposure, EGEMA (ΔDTS-1.30 MPa) showed higher resistance to biodegradation effects with a superior DTS than EGDMA (ΔDTS-6.39 MPa) (p = .0039). Visible and scanning electron microscopy images of EGEMA show less surface cracking and defects than EGDMA. EGDMA had higher loss of material (18.9% vs. 8.5%, p = .0009), relative changes to fracture toughness (92.5% vs. 49.2%, p = .0022) and increased water sorption (6.1% vs. 1.9%, p = .0022) compared to EGEMA discs. The flipped external ester group linkage design is attributed to EGEMA showing higher resistance to bacterial degradation effects than an internal ester group linkage design methacrylate.
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Affiliation(s)
- Dhiraj Kumar
- Department of Surgical and Developmental Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, USA
| | - Debarati Ghose
- Department of Surgical and Developmental Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, USA
| | | | - Isha Mutreja
- Minnesota Dental Research Center for Biomaterials and Biomechanics, Department of Restorative Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, USA
| | - Robert S Jones
- Department of Surgical and Developmental Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, USA
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