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Wen M, Bai Q, Li Y, Li Y, Ma D, Chu J. Morphological study of remineralization of the eroded enamel lesions by tyrosine-rich amelogenin peptide. BMC Oral Health 2024; 24:1054. [PMID: 39252060 PMCID: PMC11384721 DOI: 10.1186/s12903-024-04777-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Accepted: 08/20/2024] [Indexed: 09/11/2024] Open
Abstract
BACKGROUND Tyrosine-rich amelogenin peptide (TRAP) is the main amelogenin digestion product in the developmental enamel matrix. It has been shown to promote remineralization of demineralized enamel in our previous study. However, direct evidence of the effect of TRAP on the morphology and nanostructure of crystal growth on an enamel surface has not been reported. This study aimed to examine the effect of TRAP on the morphology of calcium phosphate crystals grown on early enamel erosion using a pH-cycling model. METHODS Eroded lesions were produced in human premolars by 30-second immersion in 37% phosphoric acid. Forty-five samples of eroded human premolar enamel blocks were selected and randomly divided into 3 groups: deionized water (DDW, negative control); 100 µg/mL TRAP, and 2 ppm sodium fluoride (NaF, positive control group). For 14 days, the specimens were exposed to a pH-cycling model. Using scanning electron microscopy (SEM) and atomic force microscopy (AFM) methods, the surface morphology, calcium-phosphorus ratio, and enamel surface roughness were examined. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) were used to assess crystal characteristics. RESULTS After pH-cycling, compared to the two control groups, the surface of the eroded enamel of the peptide TRAP group shows a large number of new, densely arranged rod-like crystals, parallel to each other, regularly arranged, forming an ordered structure, with crystal morphology similar to that of natural enamel. The crystals are mostly hydroxyapatite (HA). CONCLUSION This study demonstrates that the peptide TRAP modulates the formation of hydroxyapatite in eroded enamel and that the newly formed crystals resemble natural enamel crystals and promote the remineralization of enamel, providing a promising biomaterial for remineralization treatment of enamel lesions.
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Affiliation(s)
- Mingzhu Wen
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Qinghua Bai
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yiwei Li
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yaru Li
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Dandan Ma
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Jinpu Chu
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
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Li Y, Li Y, Bai Q, Wen M, Ma D, Lin Y, Chu J. Recombinant amelogenin peptide TRAP promoting remineralization of early enamel caries: An in vitro study. Front Physiol 2023; 14:1076265. [PMID: 36755789 PMCID: PMC9899998 DOI: 10.3389/fphys.2023.1076265] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 01/13/2023] [Indexed: 01/24/2023] Open
Abstract
Objective: To explore the regulatory effect of recombinant amelogenin peptide TRAP on the remineralization of early enamel carious lesions. Methods: Forty-eight bovine enamel blocks that prepared initial lesions in vitro were split at random into four groups for immersion treatment for 12 days: 1) remineralizing medium; 2) studied peptide 1 (consisting of the N- and C-termini of porcine amelogenin) + remineralizing medium; 3) studied peptide 2 (TRAP) + remineralizing medium; 4) fluoride + remineralizing medium. After demineralization and remineralization immersion, each specimen's mean mineral loss and lesion depth were measured using micro-computed tomography (micro-CT). The changes in lesion depth (∆LD) and mineral gain (∆Z) were computed following remineralization. The enamel samples were then cut into sections and examined with polarized light microscopy (PLM). The cross-section morphology was observed by scanning electron microscopy (SEM). The crystal phase was analyzed by an X-ray micro-diffractometer (XRD). The calcium-binding properties were determined using isothermal titration calorimetry (ITC). Results: Micro-CT analysis revealed a significant reduction in mineral loss in the four groups following the remineralization treatment (p < 0.05). The treatment with fluoride resulted in the greatest ∆Z and ∆LD, whereas the treatment with a remineralizing medium showed the least ∆Z and ∆LD among all groups. The ∆Z and ∆LD of the studied peptide 1 and studied peptide 2 groups were greater than those of the remineralizing medium group. However, there was no significant difference between the studied peptide 1 and studied peptide 2 groups (p > 0.05). All of the samples that the PLM analyzed had a thickening of the surface layer. A negative birefringent band changed in the lesion's body. The SEM displayed that minerals were formed in all four groups of samples. The XRD results indicated that the products of remineralization of the studied peptide were hydroxyapatite crystals (HA). ITC showed that there were two binding modes between the calcium and peptide TRAP. Conclusion: This study confirmed the potential of the recombinant amelogenin peptide TRAP as a key functional motif of amelogenin protein for enamel remineralization and provided a promising biomaterial for remineralization in initial enamel carious lesion treatment.
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Affiliation(s)
- Yaru Li
- 1The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China,2College of Stomatology, Zhengzhou University, Zhengzhou, China
| | - Yiwei Li
- 1The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China,2College of Stomatology, Zhengzhou University, Zhengzhou, China
| | - Qinghua Bai
- 1The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China,2College of Stomatology, Zhengzhou University, Zhengzhou, China
| | - Mingzhu Wen
- 1The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China,2College of Stomatology, Zhengzhou University, Zhengzhou, China
| | - Dandan Ma
- 1The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yisha Lin
- 1The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China,2College of Stomatology, Zhengzhou University, Zhengzhou, China
| | - Jinpu Chu
- 1The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China,*Correspondence: Jinpu Chu,
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Lei Y, Xu J, Pan M, Chen Y, Li X, Zhu W, Shu C, Fang T, Liao H, Luo Q, Li X. Construction of an antibacterial low-defect hybrid layer by facile PEI electrostatic assembly promotes dentin bonding. J Mater Chem B 2023; 11:335-344. [PMID: 36412982 DOI: 10.1039/d2tb01683d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Dentin bonding is the most common form of human tissue repair among tissue-biomaterial adhesions, concerning billions of people's oral health worldwide. However, insufficient adhesive infiltration in the demineralized dentin matrix (DDM) always produces numerous defects in the bonding interface termed the hybrid layer, which causes high levels of bacteria-related secondary dental diseases, and less than 50% of the bonding lasts more than 5 years. Therefore, it is urgent and vital to construct an antibacterial low-defect hybrid layer to solve the durability-related problems. A DDM with a hydrogel-like surface formed by the hydration of highly-anionic non-collagenous proteins (NCPs) is firstly used as a template to electrostatically assemble polyethyleneimine (PEI). The formation of a stable antibacterial polyelectrolyte complex of PEI/NCPs rapidly eliminates NCP hydration capacity and significantly improves the infiltration of various adhesives. Simultaneously, both the PEI during the assembly and the PEI-assembled DDM can directly destroy a biofilm of S. Mutans on the DDM. Consequently, a long-term antibacterial and low-defect hybrid layer is successfully created, which greatly improves the bonding effectiveness. This helps to improve the clinical treatment of bacteria-based dental diseases and the tooth-restoration repair effect and prevent secondary dental diseases, having significance in clinical dentistry and providing insights for other tissue-biomaterial adhesions.
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Affiliation(s)
- Yuqing Lei
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Jiajia Xu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Mengqi Pan
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Yadong Chen
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Xiaojun Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Weipu Zhu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Chang Shu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Tianxiang Fang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Hongbing Liao
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, College of Stomatology, Guangxi Medical University, Guilin 530021, China
| | - Qiaojie Luo
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Xiaodong Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
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Synthesis and Biological Properties of Alanine-Grafted Hydroxyapatite Nanoparticles. LIFE (BASEL, SWITZERLAND) 2022; 13:life13010116. [PMID: 36676065 PMCID: PMC9867268 DOI: 10.3390/life13010116] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 12/26/2022] [Accepted: 12/29/2022] [Indexed: 01/04/2023]
Abstract
Hydroxyapatite attracts great attention as hard tissues implant material for bones and teeth. Its application in reconstructive medicine depends on its biocompatibility, which is in a function of composition and surface properties. The insertion of a protein element in the composition of implants can improve the cell adhesion and the osseointegration. Having this in mind, the proposal of this work was to develop L-alanine-grafted hydroxyapatite nanoparticles and to study their biocompatibility. Two L-alanine sources and three grafting methods were used for hydroxyapatite surface functionalization. The efficiency of grafting was determined based on X-ray powder diffraction, Fourier-transform infrared spectroscopy, thermal analyses, and field-emission scanning electron microscopy. The results indicated the formation of hydroxyapatite with 8-25 wt% of organic content, depending on the grafting method. Protein adsorption, cell adhesion, and viability studies were carried out to evaluate biological properties of grafted materials. The viability of MG-63 human osteoblastic cells following 24 h incubation with the alanine-grafted hydroxyapatite samples is well preserved, being in all cases above the viability of cells incubated with hydroxyapatite. The alanine-grafted hydroxyapatite prepared in situ and by simple mixture showed higher protein adsorption and cell adhesion, respectively, indicating their potential toward use in regenerative medicine.
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Krukowski S, Sztelmach K. The influence of single and binary mixtures of collagen amino acids on the structure of synthetic calcium hydroxyapatite as a nanobiomaterial. RSC Adv 2022; 12:23769-23777. [PMID: 36093235 PMCID: PMC9394482 DOI: 10.1039/d2ra03372k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Accepted: 08/16/2022] [Indexed: 11/21/2022] Open
Abstract
The modifications carried out as part of this study were aimed at examining the effect of the addition of collagen amino acids: glycine, proline and hydroxyproline (used separately and in binary mixtures) on the physicochemical properties of hydroxyapatite obtained in their presence in vitro. The influence of mixtures of amino acids on these properties is an important element of scientific novelty. The obtained samples were tested with the use of instrumental methods: FT-IR, TEM, EDXMA, PXRD and UV spectrophotometry. The results showed the influence of the amino acids used on changes in the relative content of the labile phosphate groups constituting the structure of the hydrated surface layer of crystals. As a consequence, there were differences in some physicochemical properties of the obtained hydroxyapatites (degree of crystallinity, molar Ca/P ratio). It was also determined how the ability of the used amino acids to bind to hydroxyapatite changes.
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Affiliation(s)
- Sylwester Krukowski
- Medical University of Warsaw, Faculty of Pharmacy, Department of Analytical Chemistry Warsaw Poland
| | - Konrad Sztelmach
- Medical University of Warsaw, Faculty of Pharmacy, Department of Analytical Chemistry Warsaw Poland
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Ding L, Han S, Wang K, Zheng S, Zheng W, Peng X, Niu Y, Li W, Zhang L. Remineralization of enamel caries by an amelogenin-derived peptide and fluoride in vitro. Regen Biomater 2020; 7:283-292. [PMID: 32523730 PMCID: PMC7266664 DOI: 10.1093/rb/rbaa003] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 12/29/2019] [Accepted: 01/17/2020] [Indexed: 02/06/2023] Open
Abstract
Dental caries is one of the most common oral diseases in the world. This study was tantamount to investigate the combinatory effects of an amelogenin-derived peptide (called QP5) and fluoride on the remineralization of artificial enamel caries. The peptide QP5 was synthesized and characterized, and the binding capability of the peptide on hydroxyapatite (HA) and demineralized tooth enamel surface was analysed. Then, the mineralization function of the peptide and fluoride was studied through the spontaneous mineralization testing and remineralization on enamel caries in vitro. First, the novel peptide QP5 could bind on the hydroxyapatite and demineralized tooth enamel surfaces. Second, QP5 can transitorily stabilize the formation of amorphous calcium phosphate and direct the transformation into hydroxyapatite crystals alone and in combination with fluoride. In addition, compared to blocks treated by peptide QP5 alone or fluoride, the sample blocks showed significantly higher surface microhardness, lower mineral loss and shallower lesion depth after treatment with a combination of QP5 and fluoride at high or low concentrations. The peptide QP5 could control the crystallization of hydroxyapatite, and combinatory application of peptide QP5 and fluoride had a potential synergistic effect on the remineralization of enamel caries.
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Affiliation(s)
- Longjiang Ding
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Sili Han
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Kun Wang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Sainan Zheng
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Wenyue Zheng
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xiu Peng
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yumei Niu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Wei Li
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Linglin Zhang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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Zhang Y, Wang Z, Jiang T, Wang Y. Biomimetic regulation of dentine remineralization by amino acid in vitro. Dent Mater 2018; 35:298-309. [PMID: 30545612 DOI: 10.1016/j.dental.2018.11.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 11/18/2018] [Accepted: 11/20/2018] [Indexed: 11/25/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the effect of conditioning solutions containing DL-aspartic amino (Asp) on dentine remineralization induced by bioactive glass 45S5 (BAG) in a simulated oral environment. METHODS Sixty dentine discs from human third molars were used. Dentine specimens were treated with ethylene diamine tetraacetic acid (EDTA) to create a partially demineralization model and randomly divided to 4 groups: Artificial saliva (AS) group, Asp group (pretreated with Asp and remineralized with distilled water), BAG group (pretreated with distilled water and remineralized by BAG), Asp-BAG group (pretreated with Asp and remineralized by BAG). Each samples were measured at various time points, and at the end of the experiment, 6% citric acid challenge were taken. The remineralization characteristics were analyzed by using the spectroscopic data from attenuated total reflectance spectroscopy (ATR-IR) and Raman spectroscopy. The micro-morphology and structure were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Dentine permeability was measured before and after each treatment to evaluate the resistance of remineralized layer to acid and simulated oral environment. RESULTS Both BAG and Asp-BAG groups significantly reduced dentine permeability and formed enamel-like apatite layers on dentine surface. For the mineralization of BAG, Asp showed inhibition effect. The 7-day mineral matrix area ratio in BAG group (12.54±2.29) was lower than the value in the Asp-BAG group (17.77±2.27) (p<0.05) and the Raman intensity (RI%) in Asp-BAG Group (1.49±0.26) was also significantly higher than that of BAG group (1.34±0.14) (p<0.05). According to permeability test, the apatite layer in BAG group and Asp-BAG group effectively occluded the dentinal tubules (p<0.05) and had certain acidic resistance (p>0.05). Furthermore, adsorbed acidic amino acid on hydroxyapatite (HAP) altered the crystal to increase into a larger size in diameter during crystal growth. SIGNIFICANCE The study demonstrated that a superior remineralization efficacy of BAG with Asp pretreatment on dentine.
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Affiliation(s)
- Yuanmei Zhang
- Department of Stomatology, the First Affiliated Hospital of Zhengzhou University, No.1, Jianshe East Road, Zhengzhou, China.
| | - Zhejun Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, 237# Luoyu Road, Wuhan 430079, China; Division of Endodontics, Department of Oral Biological & Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, Canada
| | - Tao Jiang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, 237# Luoyu Road, Wuhan 430079, China
| | - Yining Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, 237# Luoyu Road, Wuhan 430079, China.
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Liu Y, Ding C, He L, Yang X, Gou Y, Xu X, Liu Y, Zhao C, Li J, Li J. Bioinspired heptapeptides as functionalized mineralization inducers with enhanced hydroxyapatite affinity. J Mater Chem B 2018; 6:1984-1994. [PMID: 32254364 DOI: 10.1039/c7tb03067c] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The regeneration of mineral crystals under physiological conditions is an efficient way to repair defects in hard tissues. To achieve robust mineralization on surfaces such as the tooth enamel, an inducer requires strong affinity with the substrates and should be able to induce mineralization. Thus far, most studies used a single molecule containing two components to realize the above functions separately, which might be troublesome to synthesize and purify. In this work, inspired by the statherin in the salivary acquired pellicle, we designed a simple peptide sequence, Asp-Asp-Asp-Glu-Glu-Lys-Cys (peptide-7), to accomplish the dual tasks of adsorption and mineralization on enamel surfaces. We speculate the calcium binding ability of the negatively charged carboxylic acid groups in the peptide itself contributes to the dual functions of peptide-7. In vitro and in vivo experiments demonstrated its excellent repair effect on enamel as compared to fluoride. More importantly, due to the strong affinity between peptides and hydroxyapatite, a compact mineralized crystal layer and a strong adhesion between the regenerated minerals and the bottom substrates were observed, similar to the effect induced by fluoride. This work sheds light on the interaction mechanism between peptide-7 and minerals. In addition, since it is safer than fluoride, peptide-7 may have potential applications in the repair of other hard tissues and the functionalization of biomaterials.
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Affiliation(s)
- Yuebo Liu
- State Key Laboratory of Oral Diseases National Clinical Research Center for Oral Diseases Dept. of Cariology and Endodonics West China Hospital of Stomatology, Sichuan University, China.
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Wakasa M, Eshita Y, Nakanishi K, Isobe T, Manago K, Okamoto M, Isshiki T. STEM and HRTEM studies of accumulated deposits on human tooth surface. Microsc Res Tech 2017; 80:511-524. [PMID: 28124499 DOI: 10.1002/jemt.22825] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 12/04/2016] [Accepted: 12/07/2016] [Indexed: 11/11/2022]
Abstract
The aim of this study was to clarify the fine structure of accumulated deposits on the surface of teeth that are considered to affect the gloss of teeth. The study was carried out using, as specimens, human incisor teeth having gloss, which were extracted from teenage donors and those incapable of showing gloss even by brushing which were extracted from donors in their 50s. Thin longitudinal sections of tooth enamel with accumulated deposits on the surface were prepared by focused ion beam (FIB) milling, and the fine structure was analyzed using a scanning transmission electron microscope (STEM) and a high resolution transmission electron microscope (HRTEM). By FIB, thin longitudinal sections could be prepared from tooth enamel together with organic and inorganic substances accumulated on the surface without artifacts. The accumulated deposits on the surface of teeth having gloss were composed of organic substances. However, it was first revealed by STEM observation that the accumulated solid deposits on the surface of teeth having no gloss had a complicated structure wherein inorganic and organic substances coexisted. It is suggested that the organic substances contain proteins derived from saliva. The inorganic substances were spherical and needle-like hydroxyapatites (HAs). It is considered that amino acids constituting the proteins affected the nucleus formation and the crystal formation of HA. It is considered that the unevenness of the accumulated deposits existing on the surface of tooth enamel having no gloss causes the decrease in gloss of teeth due to diffuse reflection of light.
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Affiliation(s)
- Masanobu Wakasa
- Analytical Science Research, Kao Corporation, Wakayama, Wakayama Prefecture, 640-8580, Japan
| | - Yoshiyuki Eshita
- Personal Health Care Products Research, Kao Corporation, Sumida-ku, Tokyo, 131-8501, Japan
| | - Kuniyuki Nakanishi
- Analytical Science Research, Kao Corporation, Wakayama, Wakayama Prefecture, 640-8580, Japan
| | - Tsutomu Isobe
- Personal Health Care Products Research, Kao Corporation, Sumida-ku, Tokyo, 131-8501, Japan
| | - Kenji Manago
- Analytical Science Research, Kao Corporation, Wakayama, Wakayama Prefecture, 640-8580, Japan
| | - Masayuki Okamoto
- Analytical Science Research, Kao Corporation, Wakayama, Wakayama Prefecture, 640-8580, Japan
| | - Toshiyuki Isshiki
- Department of Electrical Engineering and Electronics, Kyoto Institute of Technology, Sakyo-ku, Kyoto, 606-8580, Japan
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Wang Z, Xu Z, Zhao W, Sahai N. A potential mechanism for amino acid-controlled crystal growth of hydroxyapatite. J Mater Chem B 2015; 3:9157-9167. [PMID: 32263130 DOI: 10.1039/c5tb01036e] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The mineral component of bone, dentin and calcified parts of avian tendon, hydroxyapatite (HAP), has non-stoichiometric composition (idealized as Ca10(PO4)6(OH)2), plate-like morphology and nanometer size. This unique crystal morphology contributes to the physico-chemical and biochemical properties of bone. Thus, understanding the mechanism for the controlled growth of plate-like HAP nanocrystals is significant in the study of bone biomineralization. Previous studies have shown that acidic non-collagenous proteins (ANCPs), which are enriched in the residues of acidic amino acids, may play an important role in HAP crystal growth modulation. In this study, glutamic acid (Glu) and phosphoserine (Ser-OPO3) were used as model compounds to modify the synthesis of HAP nanocrystals. To identify the mechanisms of amino acids as regulators, X-ray diffraction (XRD), transmission electron microscopy (TEM) and solid state nuclear magnetic resonance (ssNMR) were used. The crystals obtained in the inorganic controls were needle-like, while crystals synthesized in the presence of the amino acids presented a plate-like morphology. The plate-like crystals had a preferred crystal orientation on (300) face, which was lacking in the inorganically grown crystals, indicating preferential adsorption and suppression of growth in specific crystal directions. Ser-OPO3 was more efficient than Glu in modulating HAP nucleation and crystal growth. Furthermore, NMR revealed interactions between the charged side chain groups in amino acids and the crystal surfaces. These results were successfully explained through our MD simulations for the free energy calculation of amino acid binding on HAP crystal faces. The present study revealed that amino acids may act as effective regulators of HAP morphology without the need to invoke large NCPs in bone biomineralization and in designing bioinspired materials for orthopaedic and dental applications.
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Affiliation(s)
- Ziqiu Wang
- Department of Polymer Science, University of Akron, 170 University Ave, Akron, OH 44325-3909, USA.
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Wu X, Zhao X, Li Y, Yang T, Yan X, Wang K. In situ synthesis carbonated hydroxyapatite layers on enamel slices with acidic amino acids by a novel two-step method. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 54:150-7. [DOI: 10.1016/j.msec.2015.05.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Revised: 03/13/2015] [Accepted: 05/02/2015] [Indexed: 10/23/2022]
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TOMOAIA GHEORGHE, PASCA ROXANADIANA. On the Collagen Mineralization. A Review. CLUJUL MEDICAL (1957) 2015; 88:15-22. [PMID: 26528042 PMCID: PMC4508610 DOI: 10.15386/cjmed-359] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 12/17/2014] [Indexed: 01/19/2023]
Abstract
Collagen mineralization (CM) is a challenging process that has received a lot of attention in the past years. Among the reasons for this interest, the key role is the importance of collagen and hydroxyapatite in natural bone, as major constituents. Different protocols of mineralization have been developed, specially using simulated body fluid (SBF) and many methods have been used to characterize the systems obtained, starting with methods of determining the mineral content (XRD, FTIR, Raman, High-Resolution Spectral Ultrasound Imaging), continuing with imaging methods (AFM, TEM, SEM, Fluorescence Microscopy), thermal analysis (DSC and TGA), evaluation of the mechanical and biological properties, including statistical methods and molecular modeling. In spite of the great number of studies regarding collagen mineralization, its mechanism, both in vivo and in vitro, is not completely understood. Some of the methods used in vitro and investigation methods are reviewed here.
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Affiliation(s)
- GHEORGHE TOMOAIA
- Orthopedic Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - ROXANA-DIANA PASCA
- Orthopedic Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
- Chemical Engineering Department, Babes-Bolyai University of Cluj-Napoca, Romania
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Xu Z, Yang Y, Wang Z, Mkhonto D, Shang C, Liu ZP, Cui Q, Sahai N. Small molecule-mediated control of hydroxyapatite growth: Free energy calculations benchmarked to density functional theory. J Comput Chem 2013; 35:70-81. [DOI: 10.1002/jcc.23474] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 09/01/2013] [Accepted: 10/06/2013] [Indexed: 02/04/2023]
Affiliation(s)
- Zhijun Xu
- Department of Polymer Science; 170 University Avenue; University of Akron; Akron Ohio 44325-3909
| | - Yang Yang
- Department of Chemistry and Biochemistry; 201 Mullica Hill Road; Rowan University; Glassboro New Jersey 08028
| | - Ziqiu Wang
- Department of Polymer Science; 170 University Avenue; University of Akron; Akron Ohio 44325-3909
| | - Donald Mkhonto
- Council for Scientific and Industrial Research; Meiring Naude Road Brumeria 0184 South Africa
| | - Cheng Shang
- Department of Chemistry; Key Laboratory of Computational Physical Science (Ministry of Education); Fudan University; Shanghai 200433 People's Republic China
| | - Zhi-Pan Liu
- Department of Chemistry; Key Laboratory of Computational Physical Science (Ministry of Education); Fudan University; Shanghai 200433 People's Republic China
| | - Qiang Cui
- Department of Chemistry and Theoretical Chemistry Institute; 1101 University Avenue; University of Wisconsin; Madison Wisconsin 53706
| | - Nita Sahai
- Department of Polymer Science; 170 University Avenue; University of Akron; Akron Ohio 44325-3909
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14
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DeVolder RJ, Kim IW, Kim ES, Kong H. Modulating the rigidity and mineralization of collagen gels using poly(lactic-co-glycolic acid) microparticles. Tissue Eng Part A 2012; 18:1642-51. [PMID: 22480235 DOI: 10.1089/ten.tea.2011.0547] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Extensive efforts have been made to prepare osteoconductive collagen gels for the regeneration of normal bone and the pathological examination of diseased bone; however, collagen gels are often plagued by limited controllability of their rigidity and mineral deposition. This study reports a simple but efficient strategy that tunes the mechanical properties of, and apatite formation in, collagen gels by incorporating hydrolyzable poly(lactic-co-glycolic acid) (PLGA) microparticles within the gels. The PLGA microparticles are associated with the collagen fibrils and increased both the gel's elasticity and rigidity while minimally influencing its permeability. As compared with pure collagen gels, the PLGA microparticle-filled collagen gels, termed PLGA-Col hydrogels, significantly enhanced the deposition of apatite-like minerals within the gels when incubated in simulated body fluid or encapsulated with mesenchymal stem cells (MSCs) undergoing osteogenic differentiation. Finally, PLGA-Col hydrogels mineralized by differentiated MSCs led to an enhanced formation of bone-like tissues within the hydrogels. Overall, the PLGA-Col hydrogel system developed in this study will serve to improve the quality of osteoconductive matrices for both fundamental and clinical studies that are relevant to bone repair, regeneration, and pathogenesis.
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Affiliation(s)
- Ross J DeVolder
- Department of Chemical and Biomolecular Engineering, University of Illinois-Champaign-Urbana, Urbana, IL 61801, USA
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15
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Shin H, Park SH, Park JW, Lee CY. Effect of fluoride concentration in pH 4.3 and pH 7.0 supersaturated solutions on the crystal growth of hydroxyapatite. Restor Dent Endod 2012. [DOI: 10.5395/rde.2012.37.1.16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Haneol Shin
- Department of Conservative Dentistry, Yonsei University College of Dentistry, Seoul, Korea
| | - Sung-Ho Park
- Department of Conservative Dentistry, Yonsei University College of Dentistry, Seoul, Korea
| | - Jeong-Won Park
- Department of Conservative Dentistry, Gangnam Severance Hospital, Yonsei University College of Dentistry, Seoul, Korea
| | - Chan-Young Lee
- Department of Conservative Dentistry, Yonsei University College of Dentistry, Seoul, Korea
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HAMADA Y, FUJITANI W, KAWAGUCHI N, DAITO K, NIIDO T, UCHINAKA A, MORI S, KOJIMA Y, MANABE M, NISHIDA K, ARITA K, NAKANO T, MATSUURA N. The preparation of PLLA/calcium phosphate hybrid composite and its evaluation of biocompatibility. Dent Mater J 2012. [DOI: 10.4012/dmj.2012-117] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Yang Y, Cui Q, Sahai N. How does bone sialoprotein promote the nucleation of hydroxyapatite? A molecular dynamics study using model peptides of different conformations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:9848-9859. [PMID: 20438109 DOI: 10.1021/la100192z] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Bone sialoprotein (BSP) is a highly phosphorylated, acidic, noncollagenous protein in bone matrix. Although BSP has been proposed to be a nucleator of hydroxyapatite (Ca(5)(PO(4))(3)OH), the major mineral component of bone, no detailed mechanism for the nucleation process has been elucidated at the atomic level to date. In the present work, using a peptide model, we apply molecular dynamics (MD) simulations to study the conformational effect of a proposed nucleating motif of BSP (a phosphorylated, acidic, 10 amino-acid residue sequence) on controlling the distributions of Ca(2+) and inorganic phosphate (Pi) ions in solution, and specifically, we explore whether a nucleating template for orientated hydroxyapatite could be formed in different peptide conformations. Both the alpha-helical conformation and the random coil structure have been studied, and inorganic solutions without the peptide are simulated as reference. Ca(2+) distributions around the peptide surface and interactions between Ca(2+) and Pi in the presence of the peptide are examined in detail. From the MD simulations, although in some cases for the alpha-helical conformation, we observe that a Ca(2+) equilateral triangle forms around the surface of peptide, which matches the distribution of Ca(2+) ions on the (001) face of the hydroxyapatite crystal, we do not consistently find a stable nucleating template formation in general for either the helical conformation or the random coil structure. Therefore, independent of conformations, the BSP nucleating motif is more likely to help nucleate an amorphous calcium phosphate cluster, which ultimately converts to crystalline hydroxyapatite.
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Affiliation(s)
- Yang Yang
- Department of Geoscience, University of Wisconsin, Madison, 1215 West Dayton Street, Madison, Wisconsin 53706, USA
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Uddin MH, Matsumoto T, Ishihara S, Nakahira A, Okazaki M, Sohmura T. Apatite Containing Aspartic Acid for Selective Protein Loading. J Dent Res 2010; 89:488-92. [DOI: 10.1177/0022034509357309] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Physico-chemical modifications of hydroxyapatite (HAp) materials are considered as pre-requisites for the development of new bioactive carrier materials for drug delivery and tissue engineering applications. Since acidic amino acids have well-documented affinities to both HAp and basic proteins, HAp modified by aspartic acid (Asp, acidic amino acid) might be one of the candidate substrates for a basic protein carrier. Here, we synthesized HAp in the presence of various concentrations of Asp and observed that HAp crystallinity and other physico-chemical properties were effectively modulated. Detailed studies indicated that Asp was not incorporated in the HAp crystal lattice, but rather was trapped in HAp crystals. Protein adsorption studies indicated that the HAp particles modified by Asp had a selective loading capacity for basic protein. Therefore, HAp particles containing Asp might have potential in drug delivery applications, especially as the carrier of basic proteins including bFGF and BMP.
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Affiliation(s)
- M. Hafiz Uddin
- Department of Oromaxillofacial Regeneration, Osaka University, 1-8 Yamada-oka, Suita, 565-0871, Japan
| | - T. Matsumoto
- Department of Oromaxillofacial Regeneration, Osaka University, 1-8 Yamada-oka, Suita, 565-0871, Japan
| | - S. Ishihara
- Department of Material Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, 599-8531, Japan
| | - A. Nakahira
- Department of Material Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, 599-8531, Japan
| | - M. Okazaki
- Department of Biomaterials Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - T. Sohmura
- Department of Oromaxillofacial Regeneration, Osaka University, 1-8 Yamada-oka, Suita, 565-0871, Japan
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Ndao M, Ash JT, Breen NF, Goobes G, Stayton PS, Drobny GP. A (13)C{(31)P} REDOR NMR investigation of the role of glutamic acid residues in statherin- hydroxyapatite recognition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:12136-43. [PMID: 19678690 PMCID: PMC3246581 DOI: 10.1021/la901647n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The side chain carboxyl groups of acidic proteins found in the extra-cellular matrix (ECM) of mineralized tissues play a key role in promoting or inhibiting the growth of minerals such as hydroxyapatite (HAP), the principal mineral component of bone and teeth. Among the acidic proteins found in the saliva is statherin, a 43-residue tyrosine-rich peptide that is a potent lubricant in the salivary pellicle and an inhibitor of both HAP crystal nucleation and growth. Three acidic amino acids-D1, E4, and E5-are located in the N-terminal 15 amino acid segment, with a fourth amino acid, E26, located outside the N-terminus. We have utilized (13)C{(31)P} REDOR NMR to analyze the role played by acidic amino acids in the binding mechanism of statherin to the HAP surface by measuring the distance between the delta-carboxyl (13)C spins of the three glutamic acid side chains of statherin (residues E4, E5, E26) and (31)P spins of the phosphate groups at the HAP surface. (13)C{(31)P} REDOR studies of glutamic-5-(13)C acid incorporated at positions E4 and E26 indicate a (13)C-(31)P distance of more than 6.5 A between the side chain carboxyl (13)C spin of E4 and the closest (31)P in the HAP surface. In contrast, the carboxyl (13)C spin at E5 has a much shorter (13)C-(31)P internuclear distance of 4.25 +/- 0.09 A, indicating that the carboxyl group of this side chain interacts directly with the surface. (13)C T(1rho) and slow-spinning MAS studies indicate that the motions of the side chains of E4 and E5 are more restricted than that of E26. Together, these results provide further insight into the molecular interactions of statherin with HAP surfaces.
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Affiliation(s)
- Moise Ndao
- Department of Chemistry, University of Washington, Seattle, Washington 98195
| | - Jason T. Ash
- Department of Chemistry, University of Washington, Seattle, Washington 98195
| | - Nicholas F. Breen
- Department of Chemistry, University of Washington, Seattle, Washington 98195
| | - Gil Goobes
- Department of Chemistry, Bar Ilan University, Ramat Gan 52900, Israel
| | - Patrick S. Stayton
- Department of Bioengineering, University of Washington, Seattle, Washington 98195
| | - Gary P. Drobny
- Department of Chemistry, University of Washington, Seattle, Washington 98195
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Yang M, Muto T, Knight D, Collins AM, Asakura T. Synthesis and Characterization of Silklike Materials Containing the Calcium-Binding Sequence from Calbindin D9k or the Shell Nacreous Matrix Protein MSI60. Biomacromolecules 2007; 9:416-20. [DOI: 10.1021/bm700665m] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mingying Yang
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 Japan, Oxford Biomaterials Ltd., Units 14-15 Galaxy House, New Greenham Business Park, Thatcham, RG19 6HR, United Kingdom, and Department of Chemistry, Bristol University, Bristol BS8 1TS, United Kingdom
| | - Tomoko Muto
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 Japan, Oxford Biomaterials Ltd., Units 14-15 Galaxy House, New Greenham Business Park, Thatcham, RG19 6HR, United Kingdom, and Department of Chemistry, Bristol University, Bristol BS8 1TS, United Kingdom
| | - David Knight
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 Japan, Oxford Biomaterials Ltd., Units 14-15 Galaxy House, New Greenham Business Park, Thatcham, RG19 6HR, United Kingdom, and Department of Chemistry, Bristol University, Bristol BS8 1TS, United Kingdom
| | - Andrew M. Collins
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 Japan, Oxford Biomaterials Ltd., Units 14-15 Galaxy House, New Greenham Business Park, Thatcham, RG19 6HR, United Kingdom, and Department of Chemistry, Bristol University, Bristol BS8 1TS, United Kingdom
| | - Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 Japan, Oxford Biomaterials Ltd., Units 14-15 Galaxy House, New Greenham Business Park, Thatcham, RG19 6HR, United Kingdom, and Department of Chemistry, Bristol University, Bristol BS8 1TS, United Kingdom
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