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Jennings CM, Markel AC, Domingo MJE, Miller KS, Bayer CL, Parekh SH. Collagen organization and structure in FBLN5-/- mice using label-free microscopy: implications for pelvic organ prolapse. BIOMEDICAL OPTICS EXPRESS 2024; 15:2863-2875. [PMID: 38855688 PMCID: PMC11161343 DOI: 10.1364/boe.518976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/14/2024] [Accepted: 03/26/2024] [Indexed: 06/11/2024]
Abstract
Pelvic organ prolapse (POP) is a gynecological disorder described by the descent of superior pelvic organs into or out of the vagina as a consequence of disrupted muscles and tissue. A thorough understanding of the etiology of POP is limited by the availability of clinically relevant samples, restricting longitudinal POP studies on soft-tissue biomechanics and structure to POP-induced models such as fibulin-5 knockout (FBLN5-/- ) mice. Despite being a principal constituent in the extracellular matrix, little is known about structural perturbations to collagen networks in the FBLN5-/- mouse cervix. We identify significantly different collagen network populations in normal and prolapsed cervical cross-sections using two label-free, nonlinear microscopy techniques. Collagen in the prolapsed mouse cervix tends to be more isotropic, and displays reduced alignment persistence via 2-D Fourier transform analysis of images acquired using second harmonic generation microscopy. Furthermore, coherent Raman hyperspectral imaging revealed elevated disorder in the secondary structure of collagen in prolapsed tissues. Our results underscore the need for in situ multimodal monitoring of collagen organization to improve POP predictive capabilities.
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Affiliation(s)
- Christian M Jennings
- Department of Biomedical Engineering, University of Texas at Austin, Austin, Texas, USA
| | - Andrew C Markel
- Department of Biomedical Engineering, Tulane University, New Orleans, Lousiana, USA
| | - Mari J E Domingo
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas, USA
| | - Kristin S Miller
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas, USA
- Department of Mechanical Engineering, University of Texas at Dallas, Richardson, Texas, USA
- Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Carolyn L Bayer
- Department of Biomedical Engineering, Tulane University, New Orleans, Lousiana, USA
| | - Sapun H Parekh
- Department of Biomedical Engineering, University of Texas at Austin, Austin, Texas, USA
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Jennings CM, Markel AC, Domingo MJ, Miller KS, Bayer CL, Parekh SH. Collagen organization and structure in FLBN5-/- mice using label-free microscopy: implications for pelvic organ prolapse. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.31.578106. [PMID: 38352586 PMCID: PMC10862878 DOI: 10.1101/2024.01.31.578106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
Pelvic organ prolapse (POP) is a gynecological disorder described by the descent of superior pelvic organs into or out of the vagina as a consequence of disrupted muscles and tissue. A thorough understanding of the etiology of POP is limited by the availability of clinically relevant samples, restricting longitudinal POP studies on soft-tissue biomechanics and structure to POP-induced models such as fibulin-5 knockout (FBLN5-/-) mice. Despite being a principal constituent in the extracellular matrix, little is known about structural perturbations to collagen networks in the FBLN5-/- mouse cervix. We identify significantly different collagen network populations in normal and prolapsed cervical cross-sections using two label-free, nonlinear microscopy techniques. Collagen in the prolapsed mouse cervix tends to be more isotropic, and displays reduced alignment persistence via 2-D Fourier Transform analysis of images acquired using second harmonic generation microscopy. Furthermore, coherent Raman hyperspectral imaging revealed elevated disorder in the secondary structure of collagen in prolapsed tissues. Our results underscore the need for in situ multimodal monitoring of collagen organization to improve POP predictive capabilities.
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Affiliation(s)
- Christian M. Jennings
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, USA
| | - Andrew C. Markel
- Department of Biomedical Engineering, Tulane University, New Orleans, LA, USA
| | - Mari J.E. Domingo
- Department of Bioengineering, University of Texas at Dallas, Richardson, TX, USA
| | - Kristin S. Miller
- Department of Bioengineering, University of Texas at Dallas, Richardson, TX, USA
- Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX, USA
- Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Carolyn L. Bayer
- Department of Biomedical Engineering, Tulane University, New Orleans, LA, USA
| | - Sapun H. Parekh
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, USA
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Sharma VJ, Green A, McLean A, Adegoke J, Gordon CL, Starkey G, D'Costa R, James F, Afara I, Lal S, Wood B, Raman J. Towards a point-of-care multimodal spectroscopy instrument for the evaluation of human cardiac tissue. Heart Vessels 2023; 38:1476-1485. [PMID: 37608153 PMCID: PMC10602956 DOI: 10.1007/s00380-023-02292-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 07/13/2023] [Indexed: 08/24/2023]
Abstract
To demonstrate that point-of-care multimodal spectroscopy using Near-Infrared (NIR) and Raman Spectroscopy (RS) can be used to diagnose human heart tissue. We generated 105 spectroscopic scans, which comprised 4 NIR and 3 RS scans per sample to generate a "multimodal spectroscopic scan" (MSS) for each heart, done across 15 patients, 5 each from the dilated cardiomyopathy (DCM), Ischaemic Heart Disease (IHD) and Normal pathologies. Each of the MSS scans was undertaken in 3 s. Data were entered into machine learning (ML) algorithms to assess accuracy of MSS in diagnosing tissue type. The median age was 50 years (IQR 49-52) for IHD, 47 (IQR 45-50) for DCM and 36 (IQR 33-52) for healthy patients (p = 0.35), 60% of which were male. MSS identified key differences in IHD, DCM and normal heart samples in regions typically associated with fibrosis and collagen (NIR wavenumbers: 1433, 1509, 1581, 1689 and 1725 nm; RS wavelengths: 1658, 1450 and 1330 cm-1). In principal component (PC) analyses, these differences explained 99.2% of the variation in 4 PCs for NIR, 81.6% in 10 PCs for Raman, and 99.0% in 26 PCs for multimodal spectroscopic signatures. Using a stack machine learning algorithm with combined NIR and Raman data, our model had a precision of 96.9%, recall of 96.6%, specificity of 98.2% and Area Under Curve (AUC) of 0.989 (Table 1). NIR and Raman modalities alone had similar levels of precision at 94.4% and 89.8% respectively (Table 1). MSS combined with ML showed accuracy of 90% for detecting dilated cardiomyopathy, 100% for ischaemic heart disease and 100% for diagnosing healthy tissue. Multimodal spectroscopic signatures, based on NIR and Raman spectroscopy, could provide cardiac tissue scans in 3-s to aid accurate diagnoses of fibrosis in IHD, DCM and normal hearts. Table 1 Machine learning performance metrics for validation data sets of (a) Near-Infrared (NIR), (b) Raman and (c and d) multimodal data using logistic regression (LR), stochastic gradient descent (SGD) and support vector machines (SVM), with combined "stack" (LR + SGD + SVM) AUC Precision Recall Specificity (a) NIR model Logistic regression 0.980 0.944 0.933 0.967 SGD 0.550 0.281 0.400 0.700 SVM 0.840 0.806 0.800 0.900 Stack 0.933 0.794 0.800 0.900 (b) Raman model Logistic regression 0.985 0.940 0.929 0.960 SGD 0.892 0.869 0.857 0.932 SVM 0.992 0.940 0.929 0.960 Stack 0.954 0.869 0.857 0.932 (c) MSS: multimodal (NIR + Raman) to detect DCM vs. IHD vs. normal patients Logistic regression 0.975 0.841 0.828 0.917 SGD 0.847 0.803 0.793 0.899 SVM 0.971 0.853 0.828 0.917 Stack 0.961 0.853 0.828 0.917 (d) MSS: multimodal (NIR + Raman) to detect pathological vs. normal patients Logistic regression 0.961 0.969 0.966 0.984 SGD 0.944 0.967 0.966 0.923 SVM 1.000 1.000 1.000 1.000 Stack 1.000 0.944 0.931 0.969 Bold values indicate values obtained from the stack algorithm and used for analyses.
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Affiliation(s)
- Varun J Sharma
- Department of Surgery, Melbourne Medical School, University of Melbourne, Melbourne, Australia.
- Brian F. Buxton Department of Cardiac Surgery, Austin Hospital, Melbourne, Australia.
- Spectromix Laboratory, Melbourne, VIC, Australia.
| | - Alexander Green
- Spectromix Laboratory, Melbourne, VIC, Australia
- Monash Biospectroscopy, Monash University, Melbourne, Australia
| | - Aaron McLean
- Spectromix Laboratory, Melbourne, VIC, Australia
- Monash Biospectroscopy, Monash University, Melbourne, Australia
| | - John Adegoke
- Spectromix Laboratory, Melbourne, VIC, Australia
- Monash Biospectroscopy, Monash University, Melbourne, Australia
| | - Claire L Gordon
- Department of Infectious Diseases, Austin Health, Melbourne, VIC, Australia
- Department of Microbiology and Immunology, The University of Melbourne, The Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
- North Eastern Public Health Unit, Austin Health, Melbourne, VIC, Australia
| | - Graham Starkey
- Liver Transplant Unit, Austin Hospital, Melbourne, Australia
| | - Rohit D'Costa
- DonateLife Victoria, Carlton, Melbourne, VIC, Australia
- Department of Intensive Care Medicine, Melbourne Health, Melbourne, VIC, Australia
| | - Fiona James
- Department of Infectious Diseases, Austin Health, Melbourne, VIC, Australia
- North Eastern Public Health Unit, Austin Health, Melbourne, VIC, Australia
| | - Isaac Afara
- School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, Australia
| | - Sean Lal
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia
| | - Bayden Wood
- Spectromix Laboratory, Melbourne, VIC, Australia
- Monash Biospectroscopy, Monash University, Melbourne, Australia
| | - Jaishankar Raman
- Department of Surgery, Melbourne Medical School, University of Melbourne, Melbourne, Australia
- Brian F. Buxton Department of Cardiac Surgery, Austin Hospital, Melbourne, Australia
- Spectromix Laboratory, Melbourne, VIC, Australia
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Toledano M, Osorio E, Osorio MT, Aguilera FS, Toledano R, Romero EF, Osorio R. Dexamethasone-doped nanoparticles improve mineralization, crystallinity and collagen structure of human dentin. J Dent 2023; 130:104447. [PMID: 36754111 DOI: 10.1016/j.jdent.2023.104447] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 02/01/2023] [Accepted: 02/04/2023] [Indexed: 02/09/2023] Open
Abstract
OBJECTIVES Bioactive materials have been used for functionalization of adhesives to promote dentin remineralization. This study aims to evaluate bonding ability and both mechanical and chemical behavior of demineralized dentin infiltrated with polymeric nanoparticles doped with dexamethasone (Dex-NPs). METHODS Dentin conditioned surfaces were infiltrated with NPs, Dex-NPs or Dex-Zn-NPs. Bonded interfaces were also created and stored for 24 h or 21d, and then submitted to microtensile bond strength testing. Dentin remineralization was analyzed by Nanohardness, Young's modulus and Raman analysis. RESULTS At 21d of storage, dentin treated with undoped-NPs attained the lowest nanohardness and Young's modulus. Dex-NPs and Zn-Dex-NPs increased dentin nanohardness and Young's modulus after 21d Raman analysis showed high remineralization, crystallinity, crosslinking and better structure of collagen when functionalized Dex-NPs were present at the dentin interface. CONCLUSIONS Infiltration of dentin with Dex-NPs promoted functional remineralization as proved by nanomechanical and morpho-chemical evaluation tests. Dexamethasone in dentin facilitated crystallographic maturity, crystallinity and improved maturity and secondary structure of dentin collagen. CLINICAL SIGNIFICANCE Using dexamethasone-functionalized NPs before resin infiltration is a clear option to obtain dentin remineralization, as these NPs produce the reinforcement of the dentin structure, which will lead to the improvement of the longevity of resin restorations.
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Affiliation(s)
- Manuel Toledano
- Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, University of Granada, Granada 18071, Spain
| | - Estrella Osorio
- Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, University of Granada, Granada 18071, Spain
| | - María T Osorio
- Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, University of Granada, Granada 18071, Spain
| | - Fátima S Aguilera
- Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, University of Granada, Granada 18071, Spain.
| | - Raquel Toledano
- Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, University of Granada, Granada 18071, Spain
| | - Enrique Fernández- Romero
- Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, University of Granada, Granada 18071, Spain
| | - Raquel Osorio
- Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, University of Granada, Granada 18071, Spain
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An Overview of Collagen-Based Composite Scaffold for Bone Tissue Engineering. Appl Biochem Biotechnol 2023:10.1007/s12010-023-04318-y. [PMID: 36652090 DOI: 10.1007/s12010-023-04318-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/06/2023] [Indexed: 01/19/2023]
Abstract
Bone regeneration or restoration is a series of well-ordered physiological activities that occur throughout a person's life, they are continuously being repaired and remodeled. A conventional bone repair procedure, such as autograft and allograft bone transplant, has failed to address bone reconstruction disputes and complexity. On the other hand, Tissue Engineering is a potential therapy option for repairing rather than replacing the damaged tissue. Biomaterials in bone tissue engineering (BTE) help pave the way for damaged tissues as an artificial extracellular matrix, facilitating new tissue growth. Collagen-based biomaterials for repair and replacement have inspired much interest in the hunt for versatile biomaterials compatible with human tissue. It is a major organic component of extracellular matrix in bone and has been employed as scaffolding material in BTE for decades. In this review, we documented the role of collagen in BTE, focusing on collagen type I, its crosslinking capability, collagen-based biomaterials, and fabrication methods. It also considers osteoblast citration a critical process in bone formation, a unique perspective for an old relationship.
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Hong DW, Chen LB, Lin XJ, Attin T, Yu H. Dual function of quercetin as an MMP inhibitor and crosslinker in preventing dentin erosion and abrasion: An in situ/in vivo study. Dent Mater 2022; 38:e297-e307. [PMID: 36192276 DOI: 10.1016/j.dental.2022.09.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 09/22/2022] [Accepted: 09/23/2022] [Indexed: 11/19/2022]
Abstract
OBJECTIVE The aim of the present study was to evaluate the in situ/in vivo effect of quercetin on dentin erosion and abrasion. METHODS Human dentin blocks (2 × 2 × 2 mm) were embedded and assigned to 6 groups: 75 μg/mL, 150 μg/mL and 300 μg/mL quercetin (Q75, Q150, Q300); 120 μg/mL chlorhexidine (CHX, positive control); and deionized water and ethanol (the negative controls). The specimens were treated with the respective solutions for 2 min and then subjected to in situ/in vivo erosive/abrasive challenge for 7 d as follows: in vivo erosion 4 times a day and then in vivo toothbrush abrasion after the first and last erosive challenges of each day. Dentin loss was assessed by profilometry. An additional dentin specimen was used to evaluate the penetration depth of quercetin into dentin by tracking the spatial distribution of its characteristic Raman peak. Moreover, dentin blocks (7 × 1.7 × 0.7 mm) were used to detect the impact of quercetin on dentin-derived matrix metalloproteinase (MMP) inhibition by in situ zymography, and the inhibition percentage (%) was calculated. Additionally, the potential collagen crosslinking interactions with quercetin were detected by Raman spectroscopy, and the crosslinking degree was determined with a ninhydrin assay. Fully demineralized dentin beams (0.5 × 0.5 × 10 mm) were used to evaluate the impact of quercetin on the mechanical properties of dentin collagen fibre by the ultimate micro-tensile strength test (μUTS). The data were analysed by one-way analysis of variance and Tukey's test (α = 0.05). RESULTS Compared to the negative controls, all treatment solutions significantly reduced dentin loss. The dentin loss of Q150 and Q300 was significantly less than that of CHX (all P < 0.05). The amount of quercetin decreased with increasing dentin depth, and the maximum penetration depth was approximately 25-30 µm. In situ zymography showed that quercetin significantly inhibited the activities of dentin-derived MMPs. The inhibitory percentages of Q75 and Q150 were significantly lower than that of CHX (all P < 0.05), but no significant difference was found between Q300 and CHX (P = 0.58). The collagen crosslinking interactions with quercetin primarily involved hydrogen bonding and the degree of crosslinking increased in a concentration-dependent manner. Statistically significant increases in μUTS values were observed for demineralized dentin beams after quercetin treatment compared with those of the control treatments (all P < 0.05). SIGNIFICANCE This study provides the first direct evidence that quercetin could penetrate approximately 25-30 µm into dentin and further prevent dentin erosion and abrasion by inhibiting dentin-derived MMP activity as well as crosslinking collagen of the demineralized organic matrix.
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Affiliation(s)
- Deng-Wei Hong
- Fujian Key Laboratory of Oral Diseases & Fujian Provincial Engineering Research Center of Oral Biomaterial & Stomatological Key Laboratory of Fujian College and University, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China; Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China
| | - Li-Bing Chen
- Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China
| | - Xiu-Jiao Lin
- Fujian Key Laboratory of Oral Diseases & Fujian Provincial Engineering Research Center of Oral Biomaterial & Stomatological Key Laboratory of Fujian College and University, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China; Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China
| | - Thomas Attin
- Clinic for Conservative and Preventive Dentistry, Center of Dental Medicine, University Zurich, Switzerland
| | - Hao Yu
- Fujian Key Laboratory of Oral Diseases & Fujian Provincial Engineering Research Center of Oral Biomaterial & Stomatological Key Laboratory of Fujian College and University, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China; Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China; Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan.
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Volumetric and Ultrasonic Studies on Interactions of Hexylene and Propylene Glycols in Aqueous Solutions of Glutaraldehyde at Different Temperatures. J SOLUTION CHEM 2022. [DOI: 10.1007/s10953-022-01192-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Early cardiac-chamber-specific fingerprints in heart failure with preserved ejection fraction detected by FTIR and Raman spectroscopic techniques. Sci Rep 2022; 12:3440. [PMID: 35236899 PMCID: PMC8891318 DOI: 10.1038/s41598-022-07390-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 02/11/2022] [Indexed: 11/09/2022] Open
Abstract
The pathophysiology of heart failure with preserved ejection fraction (HFpEF) is a matter of investigation and its diagnosis remains challenging. Although the mechanisms that are responsible for the development of HFpEF are not fully understood, it is well known that nearly 80% of patients with HFpEF have concomitant hypertension. We investigated whether early biochemical alterations were detectable during HFpEF progression in salt-induced hypertensive rats, using Fourier-transformed infrared (FTIR) and Raman spectroscopic techniques as a new diagnostic approach. Greater protein content and, specifically, greater collagen deposition were observed in the left atrium and right ventricle of hypertensive rats, together with altered metabolism of myocytes. Additionally, Raman spectra indicated a conformational change, or different degree of phosphorylation/methylation, in tyrosine-rich proteins. A correlation was found between tyrosine content and cardiac fibrosis of both right and left ventricles. Microcalcifications were detected in the left and right atria of control animals, with a progressive augmentation from six to 22 weeks. A further increase occurred in the left ventricle and right atrium of 22-week salt-fed animals, and a positive correlation was shown between the mineral deposits and the cardiac size of the left ventricle. Overall, FTIR and Raman techniques proved to be sensitive to early biochemical changes in HFpEF and preceded clinical humoral and imaging markers.
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Amin M, Abdullah BM, Rowley-Neale SJ, Wylie S, Slate AJ, Banks CE, Whitehead KA. Diamine Oxidase-Conjugated Multiwalled Carbon Nanotubes to Facilitate Electrode Surface Homogeneity. SENSORS (BASEL, SWITZERLAND) 2022; 22:675. [PMID: 35062637 PMCID: PMC8780216 DOI: 10.3390/s22020675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 01/04/2022] [Accepted: 01/11/2022] [Indexed: 11/16/2022]
Abstract
Carbon nanomaterials have gained significant interest over recent years in the field of electrochemistry, and they may be limited in their use due to issues with their difficulty in dispersion. Enzymes are prime components for detecting biological molecules and enabling electrochemical interactions, but they may also enhance multiwalled carbon nanotube (MWCNT) dispersion. This study evaluated a MWCNT and diamine oxidase enzyme (DAO)-functionalised screen-printed electrode (SPE) to demonstrate improved methods of MWCNT functionalisation and dispersion. MWCNT morphology and dispersion was determined using UV-Vis spectroscopy (UV-Vis) and scanning electron microscopy (SEM). Carboxyl groups were introduced onto the MWCNT surfaces using acid etching. MWCNT functionalisation was carried out using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) and N-Hydroxysuccinimide (NHS), followed by DAO conjugation and glutaraldehyde (GA) crosslinking. Modified C-MWNCT/EDC-NHS/DAO/GA was drop cast onto SPEs. Modified and unmodified electrodes after MWCNT functionalisation were characterised using optical profilometry (roughness), water contact angle measurements (wettability), Raman spectroscopy and energy dispersive X-ray spectroscopy (EDX) (vibrational modes and elemental composition, respectively). The results demonstrated that the addition of the DAO improved MWCNT homogenous dispersion and the solution demonstrated enhanced stability which remained over two days. Drop casting of C-MWCNT/EDC-NHS/DAO/GA onto carbon screen-printed electrodes increased the surface roughness and wettability. UV-Vis, SEM, Raman and EDX analysis determined the presence of carboxylated MWCNT variants from their non-carboxylated counterparts. Electrochemical analysis demonstrated an efficient electron transfer rate process and a diffusion-controlled redox process. The modification of such electrodes may be utilised for the development of biosensors which could be utilised to support a range of healthcare related fields.
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Affiliation(s)
- M. Amin
- Department of Engineering and Technology, Liverpool John Moore’s University, Liverpool L3 3AF, UK; (B.M.A.); (S.W.)
- Microbiology at Interfaces Group, Manchester Metropolitan University, Manchester M1 5GD, UK
| | - B. M. Abdullah
- Department of Engineering and Technology, Liverpool John Moore’s University, Liverpool L3 3AF, UK; (B.M.A.); (S.W.)
| | - S. J. Rowley-Neale
- Faculty of Science and Engineering, Manchester Metropolitan University, Manchester M1 5GD, UK; (S.J.R.-N.); (C.E.B.)
| | - S. Wylie
- Department of Engineering and Technology, Liverpool John Moore’s University, Liverpool L3 3AF, UK; (B.M.A.); (S.W.)
| | - A. J. Slate
- Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK;
| | - C. E. Banks
- Faculty of Science and Engineering, Manchester Metropolitan University, Manchester M1 5GD, UK; (S.J.R.-N.); (C.E.B.)
| | - K. A. Whitehead
- Microbiology at Interfaces Group, Manchester Metropolitan University, Manchester M1 5GD, UK
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Shaik TA, Alfonso-Garcia A, Richter M, Korinth F, Krafft C, Marcu L, Popp J. FLIm and Raman Spectroscopy for Investigating Biochemical Changes of Bovine Pericardium upon Genipin Cross-Linking. Molecules 2020; 25:E3857. [PMID: 32854230 PMCID: PMC7503846 DOI: 10.3390/molecules25173857] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 08/18/2020] [Accepted: 08/19/2020] [Indexed: 12/11/2022] Open
Abstract
Biomaterials used in tissue engineering and regenerative medicine applications benefit from longitudinal monitoring in a non-destructive manner. Label-free imaging based on fluorescence lifetime imaging (FLIm) and Raman spectroscopy were used to monitor the degree of genipin (GE) cross-linking of antigen-removed bovine pericardium (ARBP) at three incubation time points (0.5, 1.0, and 2.5 h). Fluorescence lifetime decreased and the emission spectrum redshifted compared to that of uncross-linked ARBP. The Raman signature of GE-ARBP was resonance-enhanced due to the GE cross-linker that generated new Raman bands at 1165, 1326, 1350, 1380, 1402, 1470, 1506, 1535, 1574, 1630, 1728, and 1741 cm-1. These were validated through density functional theory calculations as cross-linker-specific bands. A multivariate multiple regression model was developed to enhance the biochemical specificity of FLIm parameters fluorescence intensity ratio (R2 = 0.92) and lifetime (R2 = 0.94)) with Raman spectral results. FLIm and Raman spectroscopy detected biochemical changes occurring in the collagenous tissue during the cross-linking process that were characterized by the formation of a blue pigment which affected the tissue fluorescence and scattering properties. In conclusion, FLIm parameters and Raman spectroscopy were used to monitor the degree of cross-linking non-destructively.
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Affiliation(s)
- Tanveer Ahmed Shaik
- Leibniz Institute of Photonic Technology Jena e.V., Albert-Einstein-Str. 9, 07745 Jena, Germany; (T.A.S.); (F.K.); (C.K.)
| | - Alba Alfonso-Garcia
- Biomedical Engineering Department, University of California Davis, Davis, CA 95616, USA;
| | - Martin Richter
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany;
| | - Florian Korinth
- Leibniz Institute of Photonic Technology Jena e.V., Albert-Einstein-Str. 9, 07745 Jena, Germany; (T.A.S.); (F.K.); (C.K.)
| | - Christoph Krafft
- Leibniz Institute of Photonic Technology Jena e.V., Albert-Einstein-Str. 9, 07745 Jena, Germany; (T.A.S.); (F.K.); (C.K.)
| | - Laura Marcu
- Biomedical Engineering Department, University of California Davis, Davis, CA 95616, USA;
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology Jena e.V., Albert-Einstein-Str. 9, 07745 Jena, Germany; (T.A.S.); (F.K.); (C.K.)
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany;
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Kaczmarek B, Mazur O. Collagen-Based Materials Modified by Phenolic Acids-A Review. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E3641. [PMID: 32824538 PMCID: PMC7476000 DOI: 10.3390/ma13163641] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 08/13/2020] [Accepted: 08/14/2020] [Indexed: 02/06/2023]
Abstract
Collagen-based biomaterials constitute one of the most widely studied types of materials for biomedical applications. Low thermal and mechanical parameters are the main disadvantages of such structures. Moreover, they present low stability in the case of degradation by collagenase. To improve the properties of collagen-based materials, different types of cross-linkers have been researched. In recent years, phenolic acids have been studied as collagen modifiers. Mainly, tannic acid has been tested for collagen modification as it interacts with a polymeric chain by strong hydrogen bonds. When compared to pure collagen, such complexes show both antimicrobial activity and improved physicochemical properties. Less research reporting on other phenolic acids has been published. This review is a summary of the present knowledge about phenolic acids (e.g., tannic, ferulic, gallic, and caffeic acid) application as collagen cross-linkers. The studies concerning collagen-based materials with phenolic acids are summarized and discussed.
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Affiliation(s)
- Beata Kaczmarek
- Department of Biomaterials and Cosmetics Chemistry, Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarin 7, 87-100 Toruń, Poland;
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13
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Shaik TA, Alfonso-García A, Zhou X, Arnold KM, Haudenschild AK, Krafft C, Griffiths LG, Popp J, Marcu L. FLIm-Guided Raman Imaging to Study Cross-Linking and Calcification of Bovine Pericardium. Anal Chem 2020; 92:10659-10667. [PMID: 32598134 PMCID: PMC7539574 DOI: 10.1021/acs.analchem.0c01772] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Bovine pericardium (BP) is a vascular biomaterial used in cardiovascular surgery that is typically cross-linked for masking antigenicity and enhance stability. There is a need for biochemical evaluation of the tissue properties prior to implantation to ensure that quality and reliability standards are met. Here, engineered antigen removed BP (ARBP) that was cross-linked with 0.2% and 0.6% glutaraldehyde (GA), and further calcified in vitro to simulate graft calcifications upon implantation was characterized nondestructively using fluorescence lifetime imaging (FLIm) to identify regions of interest which were then assessed by Raman spectroscopy. We observed that the tissue fluorescence lifetime shortened, and that Raman bands at 856, 935, 1282, and 1682 cm-1 decreased, and at 1032 and 1627 cm-1 increased with increasing GA cross-linking. Independent classification analysis based on fluorescence lifetime and on Raman spectra discriminated between GA-ARBP and untreated ARBP with an accuracy of 91% and 66%, respectively. Pearson's correlation analysis showed a strong correlation between pyridinium cross-links measured with high-performance liquid chromatography and fluorescence lifetime measured at 380-400 nm (R = -0.76, p = 0.00094), as well as Raman bands at 856 cm-1 for hydroxy-proline (R = -0.68, p = 0.0056) and at 1032 cm-1 for hydroxy-pyridinium (R = 0.74, p = 0.0016). Calcified areas of GA cross-linked tissue showed characteristic hydroxyapatite (959 and 1038 cm-1) bands in the Raman spectrum and fluorescence lifetime shortened by 0.4 ns compared to uncalcified regions. FLIm-guided Raman imaging could rapidly identify degrees of cross-linking and detected calcified regions with high chemical specificity, an ability that can be used to monitor tissue engineering processes for applications in regenerative medicine.
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Affiliation(s)
- Tanveer Ahmed Shaik
- Leibniz Institute of Photonic Technology Jena e.V., Albert-Einstein-Strasse 9, 07745 Jena, Germany
| | - Alba Alfonso-García
- Department of Biomedical Engineering, University of California Davis, One Shields Avenue, Davis, California 95616, United States
| | - Xiangnan Zhou
- Department of Biomedical Engineering, University of California Davis, One Shields Avenue, Davis, California 95616, United States
| | - Katherine M Arnold
- Department of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota 55905, United States
| | - Anne K Haudenschild
- Department of Biomedical Engineering, University of California Davis, One Shields Avenue, Davis, California 95616, United States
| | - Christoph Krafft
- Leibniz Institute of Photonic Technology Jena e.V., Albert-Einstein-Strasse 9, 07745 Jena, Germany
| | - Leigh G Griffiths
- Department of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota 55905, United States
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology Jena e.V., Albert-Einstein-Strasse 9, 07745 Jena, Germany
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Laura Marcu
- Department of Biomedical Engineering, University of California Davis, One Shields Avenue, Davis, California 95616, United States
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Han SJ, Moon D, Park MY, Kwon S, Noh M, Jang J, Lee JB, Kim KS. Electric field-induced changes in biomechanical properties in human dermal fibroblasts and a human skin equivalent. Skin Res Technol 2020; 26:914-922. [PMID: 32594564 DOI: 10.1111/srt.12894] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 05/30/2020] [Indexed: 12/01/2022]
Abstract
PURPOSE An electric field (EF) can be used to change the mechanical properties of cells and skin tissues. We demonstrate EF-induced elasticity changes in human dermal fibroblasts (HDFs) and a human skin equivalent and identify the underlying principles related to the changes. METHODS HDFs and human skin equivalent were stimulated with electric fields of 1.0 V/cm. Change in cellular elasticity was determined by using atomic force microscopy. Effects of EF on the biomechanical and chemical properties of a human skin equivalent were analyzed. In cells and tissues, the effects of EF on biomarkers of cellular elasticity were investigated at the gene and protein levels. RESULTS In HDFs, the cellular elasticity was increased and the expression of biomarkers of cellular elasticity was regulated by the EF. Expression of the collagen protein in the human skin equivalent was changed by EF stimulation; however, changes in density and microstructure of the collagen fibrils were not significant. The viscoelasticity of the human skin equivalent increased in response to EF stimulation, but molecular changes were not observed in collagen. CONCLUSIONS Elasticity of cells and human skin equivalent can be regulated by electrical stimulation. Especially, the change in cellular elasticity was dependent on cell age.
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Affiliation(s)
- Se Jik Han
- Department of Biomedical Engineering, Graduate school, Kyung Hee University, Seoul, South Korea.,Department of Biomedical Engineering, College of medicine, Kyung Hee University, Seoul, South Korea
| | - Donggerami Moon
- Department of Biomedical Engineering, College of medicine, Kyung Hee University, Seoul, South Korea
| | - Moon Young Park
- Department of Biomedical Engineering, College of medicine, Kyung Hee University, Seoul, South Korea
| | - Sangwoo Kwon
- Department of Biomedical Engineering, College of medicine, Kyung Hee University, Seoul, South Korea
| | - Minjoo Noh
- Department of Innovation, Innovation Lab, Cosmax R&I Center, Gyeonggi-do, South Korea
| | - Jihui Jang
- Department of Innovation, Innovation Lab, Cosmax R&I Center, Gyeonggi-do, South Korea
| | - Jun Bae Lee
- Department of Innovation, Innovation Lab, Cosmax R&I Center, Gyeonggi-do, South Korea
| | - Kyung Sook Kim
- Department of Biomedical Engineering, College of medicine, Kyung Hee University, Seoul, South Korea
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Arbez B, Libouban H. Biomaterials preparation by electrospinning of gelatin and sodium hyaluronate/gelatin nanofibers with non-toxic solvents. Morphologie 2020; 104:158-168. [PMID: 32518048 DOI: 10.1016/j.morpho.2020.05.002] [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] [Received: 04/02/2020] [Accepted: 05/14/2020] [Indexed: 11/28/2022]
Abstract
Gelatin (Ge) based fibers have been produced by electrospinning with a non-toxic solvent for preparing membranes usable in maxillofacial surgery. Ge and Ge/sodium hyaluronate (SH) nanofibers were successfully electrospun to produce membranes whose thickness was around 150 to 200μm. The mean fiber diameter reached a maximum of 660nm for Ge fibers and 210nm for Ge/SH fibers. The presence of Ge and SH was confirmed in the membranes by Raman spectroscopy. Ge membranes had low mechanical properties and only small samples of 0.5cm in size could be retrieved from the collector as larger sample tended to tear and break. Ge/SH membranes could be retrieved from the collector slightly easily. Membranes could be handled carefully but in vivo implantation could not be planned due to poor mechanical resistance. Crosslinking by glutaraldehyde vapors reduced the mean porosity of Ge membranes; it totally prevents membranes to be retrieved from the collector. Beta tricalcium phosphate (β-TCP) particles were added with Ge during electrospinning to increase osseointegration of the membranes and promote bone formation. β-TCP particles formed agglomerates outside the fibers, and we could not obtain β-TCP particles inside the Ge fibers due to their low diameter. In general, electrospun membranes lacked reproducibility. Despite the great interest of Ge-based membranes and Ge/β-TCP membranes, the low mechanical properties of the fibers, the lack of reproducibility and the difficulty to retrieve the membranes from the collector did not allow our biomaterials to be implanted or to be envisaged for industrial production.
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Affiliation(s)
- B Arbez
- Groupe Études Remodelage Osseux et bioMatériaux (GEROM), LabCom NextBone, IRIS-IBS institut de biologie en santé, université d'Angers, CHU d'Angers, 49933 Angers cedex, France
| | - H Libouban
- Groupe Études Remodelage Osseux et bioMatériaux (GEROM), LabCom NextBone, IRIS-IBS institut de biologie en santé, université d'Angers, CHU d'Angers, 49933 Angers cedex, France.
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Adamiak K, Sionkowska A. Current methods of collagen cross-linking: Review. Int J Biol Macromol 2020; 161:550-560. [PMID: 32534089 DOI: 10.1016/j.ijbiomac.2020.06.075] [Citation(s) in RCA: 133] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 06/04/2020] [Accepted: 06/08/2020] [Indexed: 01/16/2023]
Abstract
This review provides a report on cross-linking methods used for collagen modifications. Collagen materials have attracted significant academic interest due to its biological properties in native state. However, in many cases the mechanical properties and degradation rate should be tailored to especial biomedical and cosmetic applications. In the proposed review paper, the structure, preparation, and properties of several collagen based materials have been discussed in general, and detailed examples of collagen cross-linking methods have been drawn from scientific literature and practical work. Both, physical and chemical methods of improvement of collagenous materials have been reviewed. In the review paper the cross-linking with glutaraldehyde, genipin, EDC-NHS, dialdehyde starch, chitosan, temperature, UV light and enzyme has been discussed. A critical comparison of currently available cross-linking methods has been shown.
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Affiliation(s)
| | - Alina Sionkowska
- Nicolaus Copernicus University in Torun, Faculty of Chemistry, Department of Biomaterials and Cosmetics Chemistry, Gagarin 7 street, 87-100 Torun, Poland.
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Mutated Human P-Selectin Glycoprotein Ligand-1 and Viral Protein-1 of Enterovirus 71 Interactions on Au Nanoplasmonic Substrate for Specific Recognition by Surface-Enhanced Raman Spectroscopy. COATINGS 2020. [DOI: 10.3390/coatings10040403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Protein tyrosine sulfation is a common post-translational modification that stimulates intercellular or extracellular protein-protein interactions and is responsible for various important biological processes, including coagulation, inflammation, and virus infections. Recently, human P-selectin glycoprotein ligand-1 (PSGL-1) has been shown to serve as a functional receptor for enterovirus 71 (EV71). It has been proposed that the capsid viral protein VP1 of EV71 is directly involved in this specific interaction with sulfated or mutated PSGL-1. Surface-enhanced Raman spectroscopy (SERS) is used to distinguish PSGL-1 and VP1 interactions on an Au nanoporous substrate and identify specific VP1 interaction positions of tyrosine residue sites (46, 48, and 51). The three tyrosine sites in PSGL-1 were replaced by phenylalanine (F), as determined using SERS. A strong phenylalanine SERS signal was obtained in three regions of the mutated protein on the nanoporous substrate. The mutated protein positions at (51F) and (48F, 51F) produced a strong SERS peak at 1599–1666 cm−1, which could be related to a binding with the mutated protein and anti-sulfotyrosine interactions on the nanoporous substrate. A strong SERS effect of the mutated protein and VP1 interactions appeared at (48F), (51F), and (46F, 48F). In these positions, there was less interaction with VP1, as indicated by a strong phenylalanine signal from the mutated protein.
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18
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Yin NH, Parker AW, Matousek P, Birch HL. Detection of Age-Related Changes in Tendon Molecular Composition by Raman Spectroscopy-Potential for Rapid, Non-Invasive Assessment of Susceptibility to Injury. Int J Mol Sci 2020; 21:E2150. [PMID: 32245089 PMCID: PMC7139798 DOI: 10.3390/ijms21062150] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 03/16/2020] [Accepted: 03/16/2020] [Indexed: 12/11/2022] Open
Abstract
The lack of clinical detection tools at the molecular level hinders our progression in preventing age-related tendon pathologies. Raman spectroscopy can rapidly and non-invasively detect tissue molecular compositions and has great potential for in vivo applications. In biological tissues, a highly fluorescent background masks the Raman spectral features and is usually removed during data processing, but including this background could help age differentiation since fluorescence level in tendons increases with age. Therefore, we conducted a stepwise analysis of fluorescence and Raman combined spectra for better understanding of the chemical differences between young and old tendons. Spectra were collected from random locations of vacuum-dried young and old equine tendon samples (superficial digital flexor tendon (SDFT) and deep digital flexor tendon (DDFT), total n = 15) under identical instrumental settings. The fluorescence-Raman spectra showed an increase in old tendons as expected. Normalising the fluorescence-Raman spectra further indicated a potential change in intra-tendinous fluorophores as tendon ages. After fluorescence removal, the pure Raman spectra demonstrated between-group differences in CH2 bending (1450 cm-1) and various ring-structure and carbohydrate-associated bands (1000-1100 cm-1), possibly relating to a decline in cellular numbers and an accumulation of advanced glycation end products in old tendons. These results demonstrated that Raman spectroscopy can successfully detect age-related tendon molecular differences.
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Affiliation(s)
- Nai-Hao Yin
- Research Department of Orthopaedics and Musculoskeletal Science, University College London, Royal National Orthopaedic Hospital, Stanmore HA7 4LP, UK;
| | - Anthony W. Parker
- Central Laser Facility, Research Complex at Harwell, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK; (A.W.P.); (P.M.)
| | - Pavel Matousek
- Central Laser Facility, Research Complex at Harwell, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK; (A.W.P.); (P.M.)
| | - Helen L. Birch
- Research Department of Orthopaedics and Musculoskeletal Science, University College London, Royal National Orthopaedic Hospital, Stanmore HA7 4LP, UK;
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Miao Z, Zhang P, Zhang Y, Huang X, Liu J, Wang G. Single-cell analysis reveals the effects of glutaraldehyde and formaldehyde on individual Nosema bombycis spores. Analyst 2019; 144:3136-3143. [DOI: 10.1039/c8an02425a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single-cell analysis based on optical techniques offers new understanding of the action underlying the use of aldehyde disinfectants against microsporidia spores.
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Affiliation(s)
- Zhenbin Miao
- College of Physics Science and Technology
- Guangxi Normal University
- Guilin
- China
- Guangxi Academy of Sciences
| | - Pengfei Zhang
- School of Precision Instruments and Optoelectronics Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Yu Zhang
- College of Physics Science and Technology
- Guangxi Normal University
- Guilin
- China
| | - Xuhua Huang
- Guangxi Academy of Sericultural Sciences
- Nanning
- China
| | - Junxian Liu
- College of Physics Science and Technology
- Guangxi Normal University
- Guilin
- China
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Toledano M, Osorio E, Aguilera FS, Toledano-Osorio M, López-López MT, Osorio R. Stored potential energy increases and elastic properties alterations are produced after restoring dentin with Zn-containing amalgams. J Mech Behav Biomed Mater 2018; 91:109-121. [PMID: 30553207 DOI: 10.1016/j.jmbbm.2018.12.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 11/27/2018] [Accepted: 12/05/2018] [Indexed: 12/14/2022]
Abstract
The aim of this research was to ascertain the mechanical and chemical behavior of sound and caries-affected dentin (CAD), after the placement of Zn-free vs containing amalgam restorations. Peritubular and intertubular dentin were evaluated using, a) nanoindenter in scanning mode; the load and displacement responses were used to perform the nano-Dynamic mechanical analysis and to estimate the complex (E * ) and storage modulus (E'); b) Raman spectroscopy was used to describe the hierarchical cluster analysis (HCA). Assessments were performed before restoration placement and after restoring, and after 3 months of storage with thermocycling (100,000cy/5 °C and 55 °C). When CAD was treated with Zn-containing restorations, differences between E * and E' at both peritubular and intertubular dentin augmented, with energy concentration and production of implications in the mechanical performance of the restored teeth. E * and E' were very low at intratubular dentin of CAD restored with Zn-containing restorations. The relative presence of minerals, the phosphate crystallinity and the crosslinking of collagen increased their values at both types of dentin (peritubular and intertubular) when CAD was treated with Zn-containing restorations. The nature and secondary structure of collagen improved in CAD treated with Zn-containing amalgams. Different levels of dentin remineralization were revealed by hierarchical cluster analysis.
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Affiliation(s)
- Manuel Toledano
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain.
| | - Estrella Osorio
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain
| | - Fátima S Aguilera
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain
| | - Manuel Toledano-Osorio
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain
| | - Modesto T López-López
- University of Granada, Faculty of Science, Applied Physics Department, Fuente Nueva s/n, 18071 Granada, Spain
| | - Raquel Osorio
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain
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21
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Riaz T, Zeeshan R, Zarif F, Ilyas K, Muhammad N, Safi SZ, Rahim A, Rizvi SAA, Rehman IU. FTIR analysis of natural and synthetic collagen. APPLIED SPECTROSCOPY REVIEWS 2018; 53:703-746. [DOI: 10.1080/05704928.2018.1426595] [Citation(s) in RCA: 242] [Impact Index Per Article: 40.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2023]
Affiliation(s)
- Tehseen Riaz
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Lahore, Pakistan
| | - Rabia Zeeshan
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Lahore, Pakistan
| | - Faiza Zarif
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Lahore, Pakistan
| | - Kanwal Ilyas
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Lahore, Pakistan
| | - Nawshad Muhammad
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Lahore, Pakistan
| | - Sher Zaman Safi
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Lahore, Pakistan
| | - Abdur Rahim
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Lahore, Pakistan
| | - Syed A. A. Rizvi
- Department of Pharmaceutical Sciences, College of Pharmacy, Nova Southeastern University, Fort Lauderdale, Florida, USA
| | - Ihtesham Ur Rehman
- Department of Materials Science & Engineering, Kroto Research Institute, University of Sheffield, Sheffield, UK
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Biochemical assessment of nanostructures in human trabecular bone: Proposal of a Raman microspectroscopy based measurements protocol. Injury 2018; 49 Suppl 2:S11-S21. [PMID: 30077357 DOI: 10.1016/j.injury.2018.07.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 07/26/2018] [Accepted: 07/27/2018] [Indexed: 02/02/2023]
Abstract
BACKGROUND Improvements to the understating of the compositional contributions of bone mineral and organic components to the competence of trabecular bone are crucial. The purpose of this study was to propose a protocol to study biochemical composition of trabecular bone, based on two combined Raman analysis methodologies. MATERIAL AND METHODS Both cluster and single point Raman mappings were obtained, in order to assess bone degeneration associated with aging, disease, or injury, and to help in the evaluation and development of successful therapies. In this study, human trabecular bone has been analysed throughout a) Raman cluster analysis: bone mineral content, carbonate-to-phosphate ratio (both from the mineral components), the crosslinking and nature/secondary structure of collagen (both from the organic components); and b) Single point Raman spectra, where Raman points related to the minerals and organic components were also obtained, both techniques were employed in spectra attained at 400 to 1700 cm-1. RESULTS Multivariate analysis confirmed: 1) the different spectral composition, 2) the existence of centroids grouped by chemical affinity of the various components of the trabecular bone, and 3) the several traces of centroids and distribution of chemical compositional clusters. CONCLUSIONS This study is important, because it delivers a study protocol that provides molecular variations information in both mineral and collagen structure of trabecular bone tissue. This will enable clinicians to benefit knowing the microstructural differences in the bone subjected to degeneration of their patients.
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Toledano M, Osorio R, Osorio E, Cabello I, Toledano-Osorio M, Aguilera FS. In vitro mechanical stimulation facilitates stress dissipation and sealing ability at the conventional glass ionomer cement-dentin interface. J Dent 2018; 73:61-69. [PMID: 29653140 DOI: 10.1016/j.jdent.2018.04.006] [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: 01/30/2018] [Revised: 04/06/2018] [Accepted: 04/08/2018] [Indexed: 10/17/2022] Open
Abstract
OBJECTIVE The aim of this study was to evaluate the induced changes in the chemical and mechanical performance at the glass-ionomer cement-dentin interface after mechanical load application. METHODS A conventional glass-ionomer cement (GIC) (Ketac Bond), and a resin-modified glass-ionomer cement (RMGIC) (Vitrebond Plus) were used. Bonded interfaces were stored in simulated body fluid, and then tested or submitted to the mechanical loading challenge. Different loading waveforms were applied: No cycling, 24 h cycled in sine or loaded in sustained hold waveforms. The cement-dentin interface was evaluated using a nano-dynamic mechanical analysis, estimating the complex modulus and tan δ. Atomic Force Microscopy (AFM) imaging, Raman analysis and dye assisted confocal microscopy evaluation (CLSM) were also performed. RESULTS The complex modulus was lower and tan delta was higher at interfaces promoted with the GIC if compared to the RMGIC unloaded. The conventional GIC attained evident reduction of nanoleakage. Mechanical loading favored remineralization and promoted higher complex modulus and lower tan delta values at interfaces with RMGIC, where porosity, micropermeability and nanoleakage were more abundant. CONCLUSIONS Mechanical stimuli diminished the resistance to deformation and increased the stored energy at the GIC-dentin interface. The conventional GIC induced less porosity and nanoleakage than RMGIC. The RMGIC increased nanoleakage at the porous interface, and dye sorption appeared within the cement. Both cements created amorphous and crystalline apatites at the interface depending on the type of mechanical loading. CLINICAL SIGNIFICANCE Remineralization, lower stress concentration and resistance to deformation after mechanical loading improved the sealing of the GIC-dentin interface. In vitro oral function will favor high levels of accumulated energy and permits micropermeability at the RMGIC-dentin interface which will become remineralized.
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Affiliation(s)
- Manuel Toledano
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain.
| | - Raquel Osorio
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
| | - Estrella Osorio
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
| | - Inmaculada Cabello
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
| | - Manuel Toledano-Osorio
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
| | - Fátima S Aguilera
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
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24
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Toledano M, Osorio R, Guerado E, Caso E, Osorio E. Nanostructure in the trabecular bone of postmenopausal women: Mechanical and chemical analysis. Injury 2017; 48 Suppl 6:S26-S33. [PMID: 29162238 DOI: 10.1016/s0020-1383(17)30791-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The possibility of diagnosis and prediction of multiple disorders in trabecular bone through nano-biomechanics and chemical analysis are summarized. Improvements to the understating of the compositional contributors of bone mineral and organic components to mechanical competence are crucial. Viscoelastic properties and Raman characterization have been used to evaluate possible alterations of the trabecular bone associated with aging, disease, or injury. In this study, the trabecular bone of postmenopausal women has been analyzed throughout. (a) Nanomechanical characterization, by using nano-DMA: complex modulus, tan δ, loss modulus (E'), and storage modulus (E'); and (b) Raman analysis: relative presence of minerals, carbonate-to-phosphate ratio (both from the mineral components), the crosslinking and nature/secondary structure of collagen (both from the organic components). Complementary nano-morphological studies were done assessing roughness (SRa) and collagen fibrils width, on this trabecular bone. A general idea of the behavior of the viscoelastic performance can be obtained by the Tan δ (E″/E'), that achieved 0.98GPa of damping. 249nm and 0.898μm of SRa roughness and fibrils width were obtained, respectively. The relative presence of minerals, the carbonate-to-phosphate ratio, the crosslinking and the nature/secondary structure of collagen, between 700 and 1700cm-1, were also obtained, in order to propose a study protocol for trabecular bone characterization.
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Affiliation(s)
- Manuel Toledano
- Faculty of Dentistry, Dental Materials Section, University of Granada, Granada, Spain
| | - Raquel Osorio
- Faculty of Dentistry, Dental Materials Section, University of Granada, Granada, Spain.
| | - Enrique Guerado
- Department of Orthopaedic Surgery and Traumatology, Hospital Universitario Costa del Sol, University of Malaga, Malaga, Spain
| | - Enrique Caso
- Research Unit, Hospital Universitario Costa del Sol, University of Malaga, Malaga, Spain
| | - Estrella Osorio
- Faculty of Dentistry, Dental Materials Section, University of Granada, Granada, Spain
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He Z, Chen L, Hu X, Shimada Y, Otsuki M, Tagami J, Ruan S. Mechanical properties and molecular structure analysis of subsurface dentin after Er:YAG laser irradiation. J Mech Behav Biomed Mater 2017. [PMID: 28646753 DOI: 10.1016/j.jmbbm.2017.05.036] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The purpose of this study was to evaluate the chemical and mechanical modifications in subsurface dentin layer after Er: YAG (Erbium-Yttrium Aluminium Garnet) laser irradiation, as the guidance of new dental restorative materials specific for laser irradiated dentin. MATERIALS AND METHODS Dentin disks obtained from extracted human molars were prepared and exposed to a single pulse Er:YAG laser irradiation at 80mJ/pulse. After laser irradiation the mechanical and chemical characteristics of intertubular dentin in subsurface layer were studied using nanoindentation tester and micro-Raman spectromy (μ-RS). The dentin 5-50µm depth beneath the lased surface was determined as testing area. Two-way analysis of variance (ANOVA) were used to compare the mechanical values between lased and untreated subsurface dentin (P = 0.05). RESULTS A laser affected subsurface dentin layer after Er:YAG laser treatment is present. The laser irradiation is considered to decrease the mechanical properties in the superficial subsurface layer (<15µm deep). There was no significant difference in nanohardness and Young's modulus between lased subsurface dentin and untreated dentin (p > 0.05) under the depth of 15µm. However, the dentin at 5µm and 10µm depth beneath the lased surface exhibited significantly lower (~ 47.8% and ~ 33.6% respectively) hardness (p < 0.05). Er:YAG laser irradiation affected both mineral and organic components in subsurface dentin layer, a higher degree of crystallinity and reduced organic compounds occurred in the lased subsurface dentin. CONCLUSION Under the tested laser parameters, Er:YAG laser irradiation causes lower mechanical values and reduction of organic components in subsurface dentin, which has deleterious effects on resin adhesion to this area.
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Affiliation(s)
- Zhengdi He
- Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Nanhai Road 3688, Shenzhen, Guangdong 518060, China.
| | - Lingling Chen
- Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Nanhai Road 3688, Shenzhen, Guangdong 518060, China.
| | - Xuejuan Hu
- Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Nanhai Road 3688, Shenzhen, Guangdong 518060, China.
| | - Yasushi Shimada
- Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Masayuki Otsuki
- Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Junji Tagami
- Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Shuangchen Ruan
- Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Nanhai Road 3688, Shenzhen, Guangdong 518060, China.
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Ions-modified nanoparticles affect functional remineralization and energy dissipation through the resin-dentin interface. J Mech Behav Biomed Mater 2017; 68:62-79. [DOI: 10.1016/j.jmbbm.2017.01.026] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 01/11/2017] [Accepted: 01/13/2017] [Indexed: 01/22/2023]
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Toledano M, Osorio R, Osorio E, García-Godoy F, Toledano-Osorio M, Aguilera FS. Advanced zinc-doped adhesives for high performance at the resin-carious dentin interface. J Mech Behav Biomed Mater 2016; 62:247-267. [DOI: 10.1016/j.jmbbm.2016.05.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 05/04/2016] [Accepted: 05/09/2016] [Indexed: 01/22/2023]
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Eklouh-Molinier C, Happillon T, Bouland N, Fichel C, Diébold MD, Angiboust JF, Manfait M, Brassart-Pasco S, Piot O. Investigating the relationship between changes in collagen fiber orientation during skin aging and collagen/water interactions by polarized-FTIR microimaging. Analyst 2016; 140:6260-8. [PMID: 26120602 DOI: 10.1039/c5an00278h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Upon chronological aging, human skin undergoes structural and molecular modifications, especially at the level of type I collagen. This macromolecule is one of the main dermal structural proteins and presents several age-related alterations. It exhibits a triple helical structure and assembles itself to form fibrils and fibers. In addition, water plays an important role in stabilizing the collagen triple helix by forming hydrogen-bonds between collagen residues. However, the influence of water on changes of dermal collagen fiber orientation with age has not been yet understood. Polarized-Fourier Transform Infrared (P-FTIR) imaging is an interesting biophotonic approach to determine in situ the orientation of type I collagen fibers, as we have recently shown by comparing skin samples of different ages. In this work, P-FTIR spectral imaging was performed on skin samples from two age groups (35- and 38-year-old on the one hand, 60- and 66-year-old on the other hand), and our analyses were focused on the effect of H2O/D2O substitution. Spectral data were processed with fuzzy C-means (FCM) clustering in order to distinguish different orientations of collagen fibers. We demonstrated that the orientation was altered with aging, and that D2O treatment, affecting primarily highly bound water molecules, is more marked for the youngest skin samples. Collagen-bound water-related spectral markers were also highlighted. Our results suggest a weakening of water/collagen interactions with age. This non-destructive and label-free methodology allows us to understand better the importance of bound water in collagen fiber orientation alterations occurring with skin aging. Obtaining such structural information could find benefits in dermatology as well as in cosmetics.
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Affiliation(s)
- Christophe Eklouh-Molinier
- Equipe MéDIAN-Biophotonique et Technologies pour la Santé, UFR de Pharmacie, Université de Reims Champagne-Ardenne, Reims, France.
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Bhakta S, Seraji MSI, Suib SL, Rusling JF. Antibody-like Biorecognition Sites for Proteins from Surface Imprinting on Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2015; 7:28197-206. [PMID: 26636440 PMCID: PMC4749148 DOI: 10.1021/acsami.5b11650] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Natural antibodies are used widely for important applications such as biomedical analysis, cancer therapy, and directed drug delivery, but they are expensive and may have limited stability. This study describes synthesis of antibody-like binding sites by molecular imprinting on silica nanoparticles (SiNP) using a combination of four organosilane monomers with amino acid-like side chains providing hydrophobic, hydrophilic, and H-bonding interactions with target proteins. This approach provided artificial antibody (AA) nanoparticles with good selectivity and specificity to binding domains on target proteins in a relatively low-cost synthesis. The AAs were made by polymer grafting onto SiNPs for human serum albumin (HSA) and glucose oxidase (GOx). Binding affinity, selectivity, and specificity was compared to several other proteins using adsorption isotherms and surface plasmon resonance (SPR). The Langmuir-Freundlich adsorption model was used to obtain apparent binding constants (KLF) from binding isotherms of HSA (6.7 × 10(4)) and GOx (4.7 × 10(4)) to their respective AAs. These values were 4-300 fold larger compared to a series of nontemplate proteins. SPR binding studies of AAs with proteins attached to a gold surface confirmed good specificity and revealed faster binding for the target proteins compared to nontarget proteins. Target proteins retained their secondary structures upon binding. Binding capacity of AAHSA for HSA was 5.9 mg HSA/g compared to 1.4 mg/g for previously report imprinted silica beads imprinted with poly(aminophenyl)boronic acid. Also, 90% recovery for HSA spiked into 2% calf serum was found for AAHSA.
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Affiliation(s)
- Snehasis Bhakta
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | | | - Steven L. Suib
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
- Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136, United States
| | - James F. Rusling
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
- Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136, United States
- Department of Surgery and Neag Cancer Center, University of Connecticut Health Center, Farmington, Connecticut 06030, United States
- School of Chemistry, National University of Ireland at Galway, Galway, Ireland
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On modeling and nanoanalysis of caries-affected dentin surfaces restored with Zn-containing amalgam and in vitro oral function. Biointerphases 2015; 10:041004. [DOI: 10.1116/1.4933243] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Toledano M, Aguilera FS, Osorio E, Cabello I, Toledano-Osorio M, Osorio R. Functional and molecular structural analysis of dentine interfaces promoted by a Zn-doped self-etching adhesive and an in vitro load cycling model. J Mech Behav Biomed Mater 2015; 50:131-49. [DOI: 10.1016/j.jmbbm.2015.05.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 05/20/2015] [Accepted: 05/22/2015] [Indexed: 01/22/2023]
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Self-etching zinc-doped adhesives improve the potential of caries-affected dentin to be functionally remineralized. Biointerphases 2015; 10:031002. [DOI: 10.1116/1.4926442] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Lu T, Zhu S, Ma J, Lin J, Wang W, Pan H, Tian F, Zhang W, Zhang D. Bioinspired Thermoresponsive Photonic Polymers with Hierarchical Structures and Their Unique Properties. Macromol Rapid Commun 2015; 36:1722-8. [DOI: 10.1002/marc.201500246] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Revised: 05/25/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Tao Lu
- State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Shenmin Zhu
- State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Jun Ma
- Department of Engineering; University of South Australia; Mawson Lakes SA5095 Australia
| | - Jinyou Lin
- Shanghai Synchrotron Radiation Facility; Shanghai Institute of Applied Physics Chinese Academy of Sciences; Shanghai 201204 China
| | - Wanlin Wang
- State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Hui Pan
- State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Feng Tian
- Shanghai Synchrotron Radiation Facility; Shanghai Institute of Applied Physics Chinese Academy of Sciences; Shanghai 201204 China
| | - Wang Zhang
- State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Di Zhang
- State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
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Mechanical and chemical characterisation of demineralised human dentine after amalgam restorations. J Mech Behav Biomed Mater 2015; 47:65-76. [DOI: 10.1016/j.jmbbm.2015.03.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Revised: 03/09/2015] [Accepted: 03/14/2015] [Indexed: 11/20/2022]
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Toledano M, Aguilera FS, Osorio E, Cabello I, Toledano-Osorio M, Osorio R. Bond strength and bioactivity of Zn-doped dental adhesives promoted by load cycling. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2015; 21:214-230. [PMID: 25499741 DOI: 10.1017/s1431927614013658] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The purpose of this study was to evaluate if mechanical loading influences bioactivity and bond strength at the resin-dentin interface after bonding with Zn-doped etch-and-rinse adhesives. Dentin surfaces were subjected to demineralization by 37% phosphoric acid (PA) or 0.5 M ethylenediaminetetraacetic acid (EDTA). Single bond (SB) adhesive—3M ESPE—SB+ZnO particles 20 wt% and SB+ZnCl2 2 wt% were applied on treated dentin to create the groups PA+SB, SB+ZnO, SB+ZnCl2, EDTA+SB, EDTA+ZnO, and EDTA+ZnCl2. Bonded interfaces were stored in simulated body fluid for 24 h and tested or submitted to mechanical loading. Microtensile bond strength (MTBS) was assessed. Debonded dentin surfaces were studied by high-resolution scanning electron microscopy. Remineralization of the bonded interfaces was assessed by atomic force microscope imaging/nanoindentation, Raman spectroscopy/cluster analysis, and Masson's trichrome staining. Load cycling (LC) produced reduction in MTBS in all PA+SB, and no change was encountered in EDTA+SB specimens, regardless of zinc doping. LC increased the mineralization and crystallographic maturity at the interface; a higher effect was noticed when using ZnO. Trichrome staining reflected a narrow demineralized dentin matrix after loading of dentin surfaces that were treated with SB-doped adhesives. This correlates with an increase in mineral platforms or plate-like multilayered crystals in PA or EDTA-treated dentin surfaces, respectively.
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Affiliation(s)
- Manuel Toledano
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Fátima S Aguilera
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Estrella Osorio
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Inmaculada Cabello
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Manuel Toledano-Osorio
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Raquel Osorio
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
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Unal M, Yang S, Akkus O. Molecular spectroscopic identification of the water compartments in bone. Bone 2014; 67:228-36. [PMID: 25065717 DOI: 10.1016/j.bone.2014.07.021] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 07/15/2014] [Accepted: 07/16/2014] [Indexed: 11/25/2022]
Abstract
Matrix bound water is a correlate of bone's fracture resistance and assessment of bound water is emerging as a novel measure of bone's mechanical integrity. Raman spectroscopy is one of the few nondestructive modalities to assess the hydration status in bone; however, it has not been used to study the OH-band in bone. A sequential dehydration protocol was developed to replace unbound (heat drying) and bound (ethanol or deuterium) water in bone. Raman spectra were collected serially to track the OH-band during dehydration. Spectra of synthetic hydroxyapatite, demineralized bone and bulk water were collected to identify mineral and collagen contributions to the OH-band. Band assignments were supported by computational simulations of the molecular vibrations of Gly-Pro-Hyp amino acid sequence. Experimentally and theoretically obtained spectra were interpreted for band-assignments. Water loss was measured gravimetrically and correlated to Raman intensities. Four peaks were identified to be sensitive to dehydration: 3220cm(-1) (water), 3325cm(-1) (NH and water), 3453cm(-1) (hydroxyproline and water), and 3584cm(-1) (mineral and water). These peaks were differentially sensitive to deuterium treatment such that some water peaks were replaced with deuterium oxide faster than the rest. Specifically, the peaks at 3325 and 3584cm(-1) were more tightly bound to the matrix than the remaining bands. Comparison of dehydration in mineralized and demineralized bone revealed a volume of water that may be locked in the matrix by mineral crystals. The OH-range of bone was dominated by collagen and the water since the spectral profile of dehydrated demineralized bone was similar to that of the mineralized bone. Furthermore, water associates to bone mainly by collagen as findings of experimentally and theoretically spectra. The current work is among the first thorough analysis of the Raman OH stretch band in bone and such spectral information may be used to understand the involvement of water in the fragility of aging and in diseased bone.
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Affiliation(s)
- Mustafa Unal
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.
| | - Shan Yang
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.
| | - Ozan Akkus
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA; Department of Orthopaedics, Case Western Reserve University, Cleveland, OH 44106, USA; Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.
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Toledano M, Aguilera FS, Cabello I, Osorio R. Masticatory function induced changes, at subnanostructural level, in proteins and mineral at the resin-dentine interface. J Mech Behav Biomed Mater 2014; 39:197-209. [PMID: 25146674 DOI: 10.1016/j.jmbbm.2014.07.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Revised: 07/23/2014] [Accepted: 07/27/2014] [Indexed: 01/22/2023]
Abstract
OBJECTIVE This study evaluated the ability of different in vitro mechanical loading tests to promote new mineral formation at the bonded dentine interfaces created with a two-step self-etching resin adhesive. METHODOLOGY Restored teeth were divided in the following groups: (1) unloaded, load cycling with (2) sine waveform, (3) square waveform, and hold waveform for (4) 24h, and (5) 72 h. Raman spectroscopy and cluster analysis were used to assess the resin-dentine interface. RESULTS Mechanical loading in CSEB-treated samples promoted a generalized increase of relative presence of minerals and ratio of phosphate peaks, except in square waveform, where the nature of collagen resulted damaged. Crystallinity of carbonate was higher than phosphate. The organic component showed, in general terms, an increase in crosslinking. Molecular orientation (α-helices) peaks augmented in all tests. Pentosidine vibration increases in all tests, except in hold 72 h. Ratios amide I and II/CH2 incremented, in general. Non uniform parameters of Bis-GMA and adhesive penetration were encountered, as both increased at the bottom of the hybrid layer when loading square and hold 72 h were applied. SIGNIFICANCE Functional remineralisation at the resin-dentine interface was attained after in vitro mechanical stimuli application. When loading in square waveform, the lowest vibrations to favor remineralisation were attained.
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Affiliation(s)
- Manuel Toledano
- University of Granada, Faculty of Dentistry, Dental Materials Section Colegio Máximo de Cartuja s/n 18071, Granada, Spain.
| | - Fátima S Aguilera
- University of Granada, Faculty of Dentistry, Dental Materials Section Colegio Máximo de Cartuja s/n 18071, Granada, Spain
| | - Inmaculada Cabello
- University of Granada, Faculty of Dentistry, Dental Materials Section Colegio Máximo de Cartuja s/n 18071, Granada, Spain
| | - Raquel Osorio
- University of Granada, Faculty of Dentistry, Dental Materials Section Colegio Máximo de Cartuja s/n 18071, Granada, Spain
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Remineralization of mechanical loaded resin–dentin interface: a transitional and synchronized multistep process. Biomech Model Mechanobiol 2014; 13:1289-302. [DOI: 10.1007/s10237-014-0573-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 03/14/2014] [Indexed: 12/31/2022]
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Hwang YJ, Lyubovitsky JG. The structural analysis of three-dimensional fibrous collagen hydrogels by raman microspectroscopy. Biopolymers 2013; 99:349-56. [DOI: 10.1002/bip.22183] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 11/06/2012] [Accepted: 11/07/2012] [Indexed: 01/13/2023]
Affiliation(s)
- Yu Jer Hwang
- Cell Molecular and Developmental Biology Program; University of California; Riverside; CA; 92521
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Correlations Between the Biochemistry and Mechanical States of a Sea-Urchin Ligament: A Mutable Collagenous Structure. Biointerphases 2012; 7:38. [DOI: 10.1007/s13758-012-0038-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 05/08/2012] [Indexed: 10/28/2022] Open
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Fawzy A, Nitisusanta L, Iqbal K, Daood U, Beng LT, Neo J. Characterization of riboflavin-modified dentin collagen matrix. J Dent Res 2012; 91:1049-54. [PMID: 22914538 DOI: 10.1177/0022034512459053] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Crosslinking is considered a possible approach to increasing the mechanical and structural stability and biodegradation resistance of the dentin collagen matrix. The aim of this study was to investigate the mechanical and chemical variations and collagen degradation resistance associated with crosslinking of the dentin collagen matrix with UVA-activated riboflavin. Dentin collagen matrix specimens were treated with 0.1 and 1% riboflavin for 2 min and photo-activated with 7 mW/cm(2) UVA (368 nm) for 2 min. The structural change of the dentin collagen network with collagenase exposure was investigated by AFM and SEM at different time-points. The variations in surface/bulk mechanical properties and biodegradation resistance were characterized by nano-indentation, conventional mechanical testing, and hydroxyproline liberation at different time-points. Chemical changes associated with riboflavin/collagen-matrix interaction were analyzed by micro-Raman spectroscopy. UVA-activated riboflavin increased the mechanical properties, mechanical stability, and biodegradation resistance of the dentin collagen matrix. Higher collagen-network structural resistance against collagenolytic challenges was found with crosslinking. micro-Raman spectroscopy showed a strong dependency, in both intensity and wave-number, of certain Raman bands (1242-1667 cm(-1)) with crosslinking indicating the collagen/riboflavin interactions. UVA-activated riboflavin (1%) more efficiently crosslinked the dentin collagen matrix within a relatively clinically acceptable time-frame compared with 0.1% riboflavin.
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Affiliation(s)
- A Fawzy
- Discipline of Oral Sciences, Faculty of Dentistry, National University of Singapore, 11 Lower Kent Ridge Road, Singapore, 119083, Singapore.
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Xu C, Wang Y. Collagen cross linking increases its biodegradation resistance in wet dentin bonding. THE JOURNAL OF ADHESIVE DENTISTRY 2012; 14:11-8. [PMID: 21594232 PMCID: PMC3980574 DOI: 10.3290/j.jad.a21494] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE The biodegradation of exposed dentin collagen within the adhesive/dentin (a/d) interface is one of the main reasons for composite restoration failures and seriously affects the durability of dental restorations. In the present study, the objective was to investigate whether the inclusion of the cross-linking reagent (glutaraldehyde, GA) in the adhesive would increase collagen biodegradation resistance within the a/d interface. MATERIALS AND METHODS The model adhesive consisted of ~60 % monomers (HEMA/bis-GMA, 45/55 wt/wt) and ~ 40 % ethanol as a solvent. 5% GA was added to the above formulation. After the dentin surfaces were etched for 15 s with 35% phosphoric acid, rinsed with water and blotted dry, adhesives both with and without GA were applied and polymerized by visible light for 20 s. These a/d specimens were immersed in the biodegradation solution (prepared by adding 160 mg collagenase in 1 liter of TESCA buffer solution) for up to 30 days after proceeding with the sectioning/fracture to expose the a/d interfaces. The specimens were analyzed using SEM and micro-Raman spectroscopy. RESULTS SEM results indicated that for the adhesive without GA, there were many voids and a loss of collagen fibrils in the a/d interface after being challenged by the biodegradation solution. The Raman spectra collected from the interface showed that the amide I of collagen at 1667 cm-1 obviously decreased, indicating a removal of collagen fibrils during the degradation process. For the adhesive containing GA, the collagen fibrils within the interface did not degrade at all, which was also confirmed by the Raman results. CONCLUSION The results corroborate the previous findings that by using the current adhesive system and wet bonding, the collagen fibrils in the a/d interface are largely unprotected and easily undergo biodegradation. Directly including cross-linking agents in the adhesive could protect collagen fibrils from degradation in situ within the a/d interface.
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Affiliation(s)
- Changqi Xu
- Research Fellow, University of Missouri-Kansas City School of Dentistry, Kansas City, MO, USA
| | - Yong Wang
- Associate Professor, University of Missouri-Kansas City School of Dentistry, Kansas City, MO, USA
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Jung GB, Lee HJ, Kim JH, Lim JI, Choi S, Jin KH, Park HK. Effect of cross-linking with riboflavin and ultraviolet A on the chemical bonds and ultrastructure of human sclera. JOURNAL OF BIOMEDICAL OPTICS 2011; 16:125004. [PMID: 22191917 DOI: 10.1117/1.3662458] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This study examined the effect of the cross-linking with riboflavin-ultraviolet A (UVA) irradiation on the chemical bonds and ultrastructural changes of human sclera tissues using Raman spectroscopy and atomic force microscopy (AFM). Raman spectroscopy of the normal and cross-linked human sclera tissue revealed different types of the riboflavin-UVA and collagen interactions, which could be identified from their unique peaks, intensity, and shape. Raman spectroscopy can prove to be a powerful tool for examining the chemical bond of collagenous tissues at the molecular level. After riboflavin-UVA treatment, unlike a regular parallel arrangement of normal collagen fibrils, the AFM image revealed interlocking arrangements of collagen fibrils. The observed changes in the surface topography of the collagen fibrils, as well as in their chemical bonds in the sclera tissue, support the formation of interfibrilar cross-links in sclera tissues.
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Affiliation(s)
- Gyeong-Bok Jung
- Kyung Hee University, College of Medicine, Department of Biomedical Engineering & Healthcare Industry Research Institute, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea
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Yoo JS, Kim YJ, Kim SH, Choi SH. Study on genipin: a new alternative natural crosslinking agent for fixing heterograft tissue. THE KOREAN JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY 2011; 44:197-207. [PMID: 22263152 PMCID: PMC3249303 DOI: 10.5090/kjtcs.2011.44.3.197] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2009] [Revised: 03/18/2011] [Accepted: 05/10/2011] [Indexed: 11/16/2022]
Abstract
Background In cardiac surgery, especially in the reconstruction of vascular structures and intracardiac defects, glutaraldehyde has usually been used as the reagent for fixing porcine or bovine pericardial tissues. But the well-known problem of calcification or cytotoxicity of glutaraldehyde motivates the search for a replacement. The aim of this study is to investigate the physical, mechanical, and biochemical characteristics of bovine pericardial tissues fixed with genipin, which is known to be a less toxic and more natural fixing reagent. Materials and Methods Bovine pericardial tissues were fixed with different concentrations and conditions of glutaraldehyde and genipin. To determine the physical, mechanical, and biochemical differences among different concentrations and conditions, we divided the tissue into 18 groups by concentration, the addition of organic solvents, and the timing of adding the organic solvents, and compared the characteristics of each group. Results Tensile strength, physical activity, and thermal stability tests revealed that the tissues fixed with glutaraldehyde were better with regard to mechanical strength and biochemical durability. However, the difference was not significant statistically. Conclusion Genipin can be used as an alternative crosslinking agent for pericardial tissue, considering given its physical, mechanical, biochemical characteristics and low cytotoxicity comparable to glutaraldehyde. However, further studies are needed on the immune reaction and the long term changes in genipin-fixed tissues in the human body.
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Affiliation(s)
- Jae Suk Yoo
- Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Korea
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Gullekson C, Lucas L, Hewitt K, Kreplak L. Surface-sensitive Raman spectroscopy of collagen I fibrils. Biophys J 2011; 100:1837-45. [PMID: 21463598 PMCID: PMC3072603 DOI: 10.1016/j.bpj.2011.02.026] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 01/21/2011] [Accepted: 02/17/2011] [Indexed: 10/18/2022] Open
Abstract
Collagen fibrils are the main constituent of the extracellular matrix surrounding eukaryotic cells. Although the assembly and structure of collagen fibrils is well characterized, very little appears to be known about one of the key determinants of their biological function-namely, the physico-chemical properties of their surface. One way to obtain surface-sensitive structural and chemical data is to take advantage of the near-field nature of surface- and tip-enhanced Raman spectroscopy. Using Ag and Au nanoparticles bound to Collagen type-I fibrils, as well as tips coated with a thin layer of Ag, we obtained Raman spectra characteristic to the first layer of collagen molecules at the surface of the fibrils. The most frequent Raman peaks were attributed to aromatic residues such as phenylalanine and tyrosine. In several instances, we also observed Amide I bands with a full width at half-maximum of 10-30 cm(-1). The assignment of these Amide I band positions suggests the presence of 3(10)-helices as well as α- and β-sheets at the fibril's surface.
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Affiliation(s)
| | | | | | - Laurent Kreplak
- Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
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Xu C, Wang Y. Cross-linked demineralized dentin maintains its mechanical stability when challenged by bacterial collagenase. J Biomed Mater Res B Appl Biomater 2010; 96:242-8. [PMID: 21210503 DOI: 10.1002/jbm.b.31759] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2010] [Revised: 08/02/2010] [Accepted: 08/05/2010] [Indexed: 12/31/2022]
Abstract
The molecular structure, weight loss, and mechanical properties of demineralized dentin of noncrosslinked/crosslinked by glutaraldehyde (GA) were investigated when being challenged by bacterial collagenase solution over time in this study. Raman spectra proved that crosslinking occurred in demineralized dentin matrices after being treated with GA. Meanwhile, the weight of the cross-linked demineralized dentin matrices did not change after being challenged by bacterial collagenase solution up to 1 week. However, the weight of noncross-linked dentin collagen fell by almost 45% after degradation for 5 h, and up to 100% after 19 h. The tensile strength of demineralized dentin matrices did not show a significant change after being crosslinked, while the stiffness of demineralized dentin matrices showed more improvement than that of noncross-linked collagen. The toughness of demineralized dentin matrices decreased slightly after being crosslinked. Importantly, neither the tensile strength of GA-cross-linked demineralized dentin nor its stiffness changed over time in either control buffer or collagenase solution compared with that of noncross-linked controls. These results suggested that improving the degree of crosslinking in dentin collagen could be one method to inhibit its biodegradation and further to increase the durability of dental restorations.
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Affiliation(s)
- Changqi Xu
- Department of Oral Biology, University of Missouri-Kansas City School of Dentistry, Kansas City, Missouri 64108, USA
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Hirshburg JM, Ravikumar KM, Hwang W, Yeh AT. Molecular basis for optical clearing of collagenous tissues. JOURNAL OF BIOMEDICAL OPTICS 2010; 15:055002. [PMID: 21054084 DOI: 10.1117/1.3484748] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Molecular interactions of optical clearing agents were investigated using a combination of molecular dynamics (MD) simulations and optical spectroscopy. For a series of sugar alcohols with low to high optical clearing potential, Raman spectroscopy and integrating sphere measurements were used to quantitatively characterize tissue water loss and reduction in light scattering following agent exposures. The rate of tissue water loss was found to correlate with agent optical clearing potential, but equivalent tissue optical clearing was measured in native and fixed tissue in vitro, given long-enough exposure times to the polyol series. MD simulations showed that the rate of tissue optical clearing correlated with the preferential formation of hydrogen bond bridges between agent and collagen. Hydrogen bond bridge formation disrupts the collagen hydration layer and facilitates replacement by a chemical agent to homogenize tissue refractive index. However, the reduction in tissue light scattering did not correlate with the agent index of refraction. Our results suggest that a necessary property of optical clearing agents is hyperosmolarity to tissue, but that the most effective agents with the highest rates of optical clearing are a subset with the highest collagen solubilities.
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Affiliation(s)
- Jason M Hirshburg
- Texas A&M University, Department of Biomedical Engineering, 337 Zachry Engineering Center, 3120 TAMU, College Station, Texas 77843, USA
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deAzevedo ER, Ayrosa AMIB, Faria GC, Cervantes HJ, Huster D, Bonagamba TJ, Pitombo RNM, Rabbani SR. The effects of anticalcification treatments and hydration on the molecular dynamics of bovine pericardium collagen as revealed by 13C solid-state NMR. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2010; 48:704-711. [PMID: 20641133 DOI: 10.1002/mrc.2653] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This article describes a solid-state NMR (SSNMR) investigation of the influence of hydration and chemical cross-linking on the molecular dynamics of the constituents of the bovine pericardium (BP) tissues and its relation to the mechanical properties of the tissue. Samples of natural phenethylamine-diepoxide (DE)- and glutaraldehyde (GL)-fixed BP were investigated by (13)C cross-polarization SSNMR to probe the dynamics of the collagen, and the results were correlated to the mechanical properties of the tissues, probed by dynamical mechanical analysis. For samples of natural BP, the NMR results show that the higher the hydration level the more pronounced the molecular dynamics of the collagen backbone and sidechains, decreasing the tissue's elastic modulus. In contrast, in DE- and GL-treated samples, the collagen molecules are more rigid, and the hydration seems to be less effective in increasing the collagen molecular dynamics and reducing the mechanical strength of the samples. This is mostly attributed to the presence of cross-links between the collagen plates, which renders the collagen mobility less dependent on the water absorption in chemically treated samples.
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Affiliation(s)
- E R deAzevedo
- Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, SP, Brazil.
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Kim CY, Kim KH, Moon KC, Kim WH, Sung SC, Kim YJ. Comparison of Different Methods of Aortic Valve Conduit Xenograft Preservation in an Animal Experiment Model; Fresh Cryopreservation versus Acellularized Cryopreservation. THE KOREAN JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY 2010. [DOI: 10.5090/kjtcs.2010.43.1.11] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hartman O, Zhang C, Adams EL, Farach-Carson MC, Petrelli NJ, Chase BD, Rabolt JF. Microfabricated electrospun collagen membranes for 3-D cancer models and drug screening applications. Biomacromolecules 2009; 10:2019-32. [PMID: 19624098 PMCID: PMC2777622 DOI: 10.1021/bm8012764] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Invasive epithelial tumors form from cells that are released from their natural basement membrane and form 3-D structures that interact with each other and with the microenvironment of the stromal tissues around the tumor, which often contains collagen. Cancer cells, growing as monolayers on tissue culture plastic, do not reflect many of the properties of whole tumors. This shortcoming limits their ability to serve as models for testing of pharmacologically active compounds, including those that are being tested as antineoplastics. This work seeks to create new 3-D cellular materials possessing properties similar to those in native tissues surrounding cancers, specifically electrospun micro- and nanofibrous collagen scaffolds that support tumor growth in 3-D. We hypothesize that a 3-D culture system will provide a better replica of tumor growth in a native environment and, thus, better report the bioactivity of antineoplastic agents. In addition, we optimized conditions and identified physical characteristics that support growth of the highly invasive, prostate cancer bone metastatic cell line C4-2B on these matrices for use in anticancer drug studies. The effects of matrix porosity, fiber diameter, elasticity, and surface roughness on growth of cancer cells were evaluated. Data indicates that while cells attach and grow well on both nano- and microfibrous electrospun membranes, the microfibrous membrane represented a better approximation of the tumor microenvironment. It was also observed that C4-2B nonadherent cells migrated through the depth of two electrospun membranes and formed colonies resembling tumors on day 3. An apoptosis study revealed that cells on electrospun substrates were more resistant to both antineoplastic agents, docetaxel (DOC), and camptothecin (CAM) compared to the cells grown on standard collagen-coated tissue culture polystyrene (TCP). Growth, survival, and apoptosis were measured, as well as the differences in the apoptotic capabilities, of the two above-mentioned compounds compared to known clinical performance. We conclude that 3-D electrospun membranes are amenable to high throughput screening for cancer cell susceptibility and combination killing (Banerjee, S.; Hussain, M.; Wang, Z.; Saliganan, A.; Che, M.; Bonfil, D.; Cher, M.; Sarkar, F.H. Cancer Research, 2007, 67 (8), 3818-26).
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Affiliation(s)
- Olga Hartman
- Department of Materials Science and Engineering, Center for Translational Cancer Research, and Delaware Biotechnology Institute, University of Delaware, Newark, Delaware 19716, USA.
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