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De-Deus G, Arashiro FN, Souza EM, Silva EJNL, Guimarães TDM, Maciel ACDC, Oliveira DDS, Belladonna FG, Lopes RT, Versiani MA. The impact of long-term storage conditions on the development of experimental dentinal microcracks. AUST ENDOD J 2024; 50:60-68. [PMID: 37876340 DOI: 10.1111/aej.12806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 07/27/2023] [Accepted: 10/16/2023] [Indexed: 10/26/2023]
Abstract
This study evaluated the impact of long-term storage conditions (medium and time) on the development of experimental dentinal microcracks through micro-computed tomography. Sixty freshly extracted premolars were stored in formalin, water, or dry conditions (n = 20) and scanned after 72 h, 30 days, 6 months and 3 years of extraction. The effect of the storage medium and time on the occurrence of dentinal defects was statistically evaluated. A total of 211 000 images were screened revealing the existence of 11 519 slices with dentinal defects. Dry conditions significantly contributed to the development of new defects in all time points. During the 3-year follow-up period, no new defects were detected in the teeth that were stored in water and, in a single tooth, in the formalin group, after 6 months of storage.
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Affiliation(s)
- Gustavo De-Deus
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Fabio Nakao Arashiro
- Department of Endodontics, School of Dentistry Federal University of Mato Grosso do Sul, Campo Grande, Brazil
| | - Erick Miranda Souza
- Department of Dentistry II, Federal University of Maranhão, São Luís, Maranhão, Brazil
| | - Emmanuel João Nogueira Leal Silva
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
- Department of Endodontics, Grande Rio University, Duque de Caxias, Rio de Janeiro, Brazil
| | | | | | | | | | - Ricardo Tadeu Lopes
- Nuclear Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marco Aurélio Versiani
- Dental Specialty Center, Brazilian Military Police, Belo Horizonte, Minas Gerais, Brazil
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2
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Haupt F, Dullin C, Krebs M, Hettwer-Steeger I, Kanzow P, Rödig T. Micro-CT evaluation of frozen and embalmed human cadavers on the effect of root canal preparation on microcrack formation in old dentin. PLoS One 2023; 18:e0281124. [PMID: 36716302 PMCID: PMC9886256 DOI: 10.1371/journal.pone.0281124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Accepted: 01/13/2023] [Indexed: 02/01/2023] Open
Abstract
The aim of this study was to evaluate the existence of preoperative dentinal defects among differently preserved dentoalveolar bone-blocks (frozen vs. embalmed) and to investigate the effect of varying apical forces (low: <4 N, high: 4-8 N) during root canal preparation on microcrack formation using micro-computed tomography (micro-CT). Thirteen embalmed and seven frozen bone-blocks containing 1-3 single rooted teeth were collected. The teeth were evenly divided into three groups (n = 10): FLow (frozen, <4 N), ELow (embalmed, <4 N), EHigh (embalmed, 4-8 N). After working length determination all specimens were scanned preoperatively. Root canal preparation was performed using nickel-titanium instruments sizes 25/.06 and 40/.06 (F6 SkyTaper; Komet, Lemgo, Germany). A postoperative scan was performed and image stacks were co-registered. All cross-sectional images were screened to identify the presence of dentinal defects. The results were expressed as the percentage of teeth/slices presenting dentinal defects. The statistical analyses were performed with Kruskal-Wallis-Test and Mann-Whitney-U-Test (α = 5%). Embalmed specimens presented a significantly higher percentage of slices with preoperative microcracks (p<0.05) than frozen specimens. No significant difference between groups was observed regarding the induction of microcracks (p>0.05). Root canal preparation does not induce microcracks in dentoalveolar bone-blocks from donors of old age, irrespective of the preservation method and the apically directed forces.
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Affiliation(s)
- Franziska Haupt
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
- * E-mail:
| | - Christian Dullin
- Department of Diagnostic and Interventional Radiology, University Medical Center Göttingen, Göttingen, Germany
| | - Marcel Krebs
- Department of Pathology, University Medical Center Göttingen, Göttingen, Germany
| | | | - Philipp Kanzow
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Tina Rödig
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
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3
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Influence of moisture content of frozen and embalmed human cadavers for identification of dentinal microcracks using micro-computed tomography. J Mech Behav Biomed Mater 2022; 133:105310. [PMID: 35696968 DOI: 10.1016/j.jmbbm.2022.105310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Revised: 05/31/2022] [Accepted: 06/02/2022] [Indexed: 10/18/2022]
Abstract
The aim of this study was to investigate the influence of moisture content in frozen and embalmed human cadavers on the detection of dentinal microcracks using micro-computed tomography (micro-CT). The group of embalmed specimens included three mandibular and two maxillary segments each containing one tooth. The group of frozen cadavers consisted of two frozen mandibular bone-blocks with two teeth and one mandibular segment containing one tooth. The final number of teeth for each preservation method was n = 5. All specimens were scanned with eight different moisture conditions: 48 h wet, 2 h dry, 48 h wet, 24 h dry, 48 h wet, 1 wk dry, 48 h wet, 1 wk dry. Micro-CT images were screened for the presence of dentinal microcracks. Statistical analysis was performed by nonparametric analysis of variance (α = 5%). Only few microcracks were observed in wet and in 2 h dried bone-blocks with no significant differences (p = 0.63 and p = 0.23, respectively). There was a significant and steady increase of microcracks within the groups of dried specimens as follows: 2 h dry < 24 h dry < first wk dry < second wk dry (all p < 0.008). Preservation method had no significant influence on the visibility of microcracks (p = 0.98). Identification of dentinal microcracks on micro-CT images is influenced by moisture content of cadaveric bone-blocks irrespective of the preservation method.
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Alunni Cardinali M, Morresi A, Fioretto D, Vivarelli L, Dallari D, Govoni M. Brillouin and Raman Micro-Spectroscopy: A Tool for Micro-Mechanical and Structural Characterization of Cortical and Trabecular Bone Tissues. MATERIALS 2021; 14:ma14226869. [PMID: 34832271 PMCID: PMC8618195 DOI: 10.3390/ma14226869] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/04/2021] [Accepted: 11/12/2021] [Indexed: 02/03/2023]
Abstract
Human bone is a specialized tissue with unique material properties, providing mechanical support and resistance to the skeleton and simultaneously assuring capability of adaptation and remodelling. Knowing the properties of such a structure down to the micro-scale is of utmost importance, not only for the design of effective biomimetic materials but also to be able to detect pathological alterations in material properties, such as micro-fractures or abnormal tissue remodelling. The Brillouin and Raman micro-spectroscopic (BRmS) approach has the potential to become a first-choice technique, as it is capable of simultaneously investigating samples’ mechanical and structural properties in a non-destructive and label-free way. Here, we perform a mapping of cortical and trabecular bone sections of a femoral epiphysis, demonstrating the capability of the technique for discovering the morpho-mechanics of cells, the extracellular matrix, and marrow constituents. Moreover, the interpretation of Brillouin and Raman spectra merged with an approach of data mining is used to compare the mechanical alterations in specimens excised from distinct anatomical areas and subjected to different sample processing. The results disclose in both cases specific alterations in the morphology and/or in the tissue chemical make-up, which strongly affects bone mechanical properties, providing a method potentially extendable to other important biomedical issues.
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Affiliation(s)
- Martina Alunni Cardinali
- Department of Physics and Geology, University of Perugia, Via A. Pascoli, I-06123 Perugia, Italy;
- Correspondence:
| | - Assunta Morresi
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, I-06123 Perugia, Italy;
| | - Daniele Fioretto
- Department of Physics and Geology, University of Perugia, Via A. Pascoli, I-06123 Perugia, Italy;
- CEMIN—Center of Excellence for Innovative Nanostructured Material, I-06123 Perugia, Italy
| | - Leonardo Vivarelli
- Reconstructive Orthopaedic Surgery and Innovative Techniques—Musculoskeletal Tissue Bank, IRCCS Istituto Ortopedico Rizzoli, Via G.C. Pupilli 1, 40136 Bologna, Italy; (L.V.); (D.D.); (M.G.)
| | - Dante Dallari
- Reconstructive Orthopaedic Surgery and Innovative Techniques—Musculoskeletal Tissue Bank, IRCCS Istituto Ortopedico Rizzoli, Via G.C. Pupilli 1, 40136 Bologna, Italy; (L.V.); (D.D.); (M.G.)
| | - Marco Govoni
- Reconstructive Orthopaedic Surgery and Innovative Techniques—Musculoskeletal Tissue Bank, IRCCS Istituto Ortopedico Rizzoli, Via G.C. Pupilli 1, 40136 Bologna, Italy; (L.V.); (D.D.); (M.G.)
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Optical investigation of bovine grey and white matters in visible and near-infrared ranges. POLISH JOURNAL OF MEDICAL PHYSICS AND ENGINEERING 2021. [DOI: 10.2478/pjmpe-2021-0012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Introduction: Due to enormous interests for laser in medicine and biology, optical properties characterization of different tissue have be affecting in development processes. In addition, the optical properties of biological tissues could be influenced by storage methods. Thus, optical properties of bovine white and grey tissues preserved by formalin have been characterized over a wide wavelength spectrum varied between 440 nm and 1000 nm.
Materials and Methods: To that end, a single integrating sphere system was assembled for spectroscopic characterization and an inverse adding-doubling algorithm was used to retrieve optical coefficients, i.e. reduced scattering and absorption coefficients.
Results: White matter has shown a strong scattering property in comparison to grey matter. On the other hand, the grey matter has absorbed light extensively. In comparison, the reduced scattering profile for both tissue types turned out to be consistent with prior works that characterized optical coefficients in vivo. On the contrary, absorption coefficient behavior has a different feature.
Conclusion: Formalin could change the tissue’s optical properties because of the alteration of tissue’s structure and components. The absence of hemoglobin that seeps out due to the use of a formalin could reduce the absorption coefficient over the visible range. Both the water replacement by formalin could reduce the refractive index of a stored tissue and the absence of hemoglobin that scatters light over the presented wavelength range should diminish the reduced scattering coefficients over that wavelength range.
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Zwirner J, Scholze M, Ondruschka B, Hammer N. What is Considered a Variation of Biomechanical Parameters in Tensile Tests of Collagen-Rich Human Soft Tissues? - Critical Considerations Using the Human Cranial Dura Mater as a Representative Morpho-Mechanic Model. MEDICINA (KAUNAS, LITHUANIA) 2020; 56:E520. [PMID: 33027931 PMCID: PMC7600870 DOI: 10.3390/medicina56100520] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 09/27/2020] [Accepted: 09/28/2020] [Indexed: 12/23/2022]
Abstract
Background and Objectives: Profound knowledge on the load-dependent behavior of human soft tissues is required for the development of suitable replacements as well as for realistic computer simulations. Regarding the former, e.g., the anisotropy of a particular biological tissue has to be represented with site- and direction-dependent particular mechanical values. Contrary to this concept of consistent mechanical properties of a defined soft tissue, mechanical parameters of soft tissues scatter considerably when being determined in tensile tests. In spite of numerous measures taken to standardize the mechanical testing of soft tissues, several setup- and tissue-related factors remain to influence the mechanical parameters of human soft tissues to a yet unknown extent. It is to date unclear if measurement extremes should be considered a variation or whether these data have to be deemed incorrect measurement outliers. This given study aimed to determine mechanical parameters of the human cranial dura mater as a model for human soft tissues using a highly standardized protocol and based on this, critically evaluate the definition for the term mechanical "variation" of human soft tissue. Materials and Methods: A total of 124 human dura mater samples with an age range of 3 weeks to 94 years were uniformly retrieved, osmotically adapted and mechanically tested using customized 3D-printed equipment in a quasi-static tensile testing setup. Scanning electron microscopy of 14 samples was conducted to relate the mechanical parameters to morphological features of the dura mater. Results: The here obtained mechanical parameters were scattered (elastic modulus = 46.06 MPa, interquartile range = 33.78 MPa; ultimate tensile strength = 5.56 MPa, interquartile range = 4.09 MPa; strain at maximum force = 16.58%, interquartile range = 4.81%). Scanning electron microscopy revealed a multi-layered nature of the dura mater with varying fiber directions between its outer and inner surface. Conclusions: It is concluded that mechanical parameters of soft tissues such as human dura mater are highly variable even if a highly standardized testing setup is involved. The tissue structure and composition appeared to be the main contributor to the scatter of the mechanical parameters. In consequence, mechanical variation of soft tissues can be defined as the extremes of a biomechanical parameter due to an uncontrollable change in tissue structure and/or the respective testing setup.
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Affiliation(s)
- Johann Zwirner
- Department of Anatomy, University of Otago, Dunedin 9016, New Zealand
| | - Mario Scholze
- Institute of Materials Science and Engineering, Chemnitz University of Technology, 09125 Chemnitz, Germany;
- Department of Macroscopic and Clinical Anatomy, Medical University of Graz, 8010 Graz, Austria
| | - Benjamin Ondruschka
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, 22529 Hamburg, Germany;
| | - Niels Hammer
- Department of Macroscopic and Clinical Anatomy, Medical University of Graz, 8010 Graz, Austria
- Department of Orthopaedic and Trauma Surgery, University of Leipzig, 04103 Leipzig, Germany
- Fraunhofer IWU, 01187 Dresden, Germany
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7
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Rawson SD, Shearer T, Lowe T, O'Brien M, Wong JKF, Margetts L, Cartmell SH. Four-Dimensional Imaging of Soft Tissue and Implanted Biomaterial Mechanics: A Barbed Suture Case Study for Tendon Repair. ACS APPLIED MATERIALS & INTERFACES 2018; 10:38681-38691. [PMID: 30346683 DOI: 10.1021/acsami.8b09700] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Timely, recent developments in X-ray microcomputed tomography (XμCT) imaging such as increased resolution and improved sample preparation enable nondestructive time-lapse imaging of polymeric biomaterials when implanted in soft tissue, which we demonstrate herein. Imaging the full three-dimensional (3D) structure of an implanted biomaterial provides new opportunities to assess the micromechanics of the interface between the implant and tissues and how this changes over time as force is applied in load-bearing musculoskeletal applications. In this paper, we present a case study demonstrating in situ XμCT and finite element analysis, using a dynamically loaded barbed suture repair for its novel use in tendon tissue. The aim of this study was to identify the distribution of stress in the suture and tendon as load is applied. The data gained demonstrate a clear 3D visualization of microscale features in both the tissue and implant in wet conditions. XμCT imaging has revealed, for the first time, pores around the suture, preventing full engagement of all the barbs with the tendon tissue. Subsequent finite element analysis reveals the localized stress and strain, which are not evenly distributed along the suture, or throughout the tissue. This case study demonstrates for the first time a powerful in situ mechanical imaging tool, which could be readily adapted by other laboratories to interrogate and optimize the interface between the implanted biomaterials and the soft tissue.
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8
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Pinkert MA, Hortensius RA, Ogle BM, Eliceiri KW. Imaging the Cardiac Extracellular Matrix. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1098:21-44. [PMID: 30238364 DOI: 10.1007/978-3-319-97421-7_2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Cardiovascular disease is the global leading cause of death. One route to address this problem is using biomedical imaging to measure the molecules and structures that surround cardiac cells. This cellular microenvironment, known as the cardiac extracellular matrix, changes in composition and organization during most cardiac diseases and in response to many cardiac treatments. Measuring these changes with biomedical imaging can aid in understanding, diagnosing, and treating heart disease. This chapter supports those efforts by reviewing representative methods for imaging the cardiac extracellular matrix. It first describes the major biological targets of ECM imaging, including the primary imaging target of fibrillar collagen. Then it discusses the imaging methods, describing their current capabilities and limitations. It categorizes the imaging methods into two main categories: organ-scale noninvasive methods and cellular-scale invasive methods. Noninvasive methods can be used on patients, but only a few are clinically available, and others require further development to be used in the clinic. Invasive methods are the most established and can measure a variety of properties, but they cannot be used on live patients. Finally, the chapter concludes with a perspective on future directions and applications of biomedical imaging technologies.
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Affiliation(s)
- Michael A Pinkert
- Laboratory for Optical and Computational Instrumentation and Department of Medical Physics, University of Wisconsin at Madison, Madison, WI, USA.,Morgridge Institute for Research, Madison, WI, USA
| | - Rebecca A Hortensius
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA
| | - Brenda M Ogle
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA
| | - Kevin W Eliceiri
- Laboratory for Optical and Computational Instrumentation and Department of Medical Physics, University of Wisconsin at Madison, Madison, WI, USA. .,Morgridge Institute for Research, Madison, WI, USA.
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9
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Wilke J, Schleip R, Yucesoy CA, Banzer W. Not merely a protective packing organ? A review of fascia and its force transmission capacity. J Appl Physiol (1985) 2018; 124:234-244. [DOI: 10.1152/japplphysiol.00565.2017] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Recent research indicates that fascia is capable of changing its biomechanical properties. Moreover, as it links the skeletal muscles, forming a body-wide network of multidirectional myofascial continuity, the classical conception of muscles as independent actuators has been challenged. Hence, the present synthesis review aims to characterize the mechanical relevance of the connective tissue for the locomotor system. Results of cadaveric and animal studies suggest a clinically relevant myofascial force transmission to neighboring structures within one limb (e.g., between synergists) and in the course of muscle-fascia chains (e.g., between leg and trunk). Initial in vivo trials appear to underpin these findings, demonstrating the existence of nonlocal exercise effects. However, the factors influencing the amount of transmitted force (e.g., age and physical activity) remain controversial, as well as the role of the central nervous system within the context of the observed remote exercise effects.
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Affiliation(s)
- Jan Wilke
- Department of Sports Medicine, Goethe University, Frankfurt am Main, Germany
| | - Robert Schleip
- Fascia Research Group, Neurosurgical Clinic Guenzburg of Ulm University, Ulm, Germany
| | - Can A. Yucesoy
- Institute of Biomedical Engineering, Bogazici University, Instanbul, Turkey
| | - Winfried Banzer
- Department of Sports Medicine, Goethe University, Frankfurt am Main, Germany
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Rieppo L, Kokkonen HT, Kulmala KAM, Kovanen V, Lammi MJ, Töyräs J, Saarakkala S. Infrared microspectroscopic determination of collagen cross-links in articular cartilage. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:35007. [PMID: 28290599 DOI: 10.1117/1.jbo.22.3.035007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 02/22/2017] [Indexed: 06/06/2023]
Abstract
Collagen forms an organized network in articular cartilage to give tensile stiffness to the tissue. Due to its long half-life, collagen is susceptible to cross-links caused by advanced glycation end-products. The current standard method for determination of cross-link concentrations in tissues is the destructive high-performance liquid chromatography (HPLC). The aim of this study was to analyze the cross-link concentrations nondestructively from standard unstained histological articular cartilage sections by using Fourier transform infrared (FTIR) microspectroscopy. Half of the bovine articular cartilage samples ( n = 27 ) were treated with threose to increase the collagen cross-linking while the other half ( n = 27 ) served as a control group. Partial least squares (PLS) regression with variable selection algorithms was used to predict the cross-link concentrations from the measured average FTIR spectra of the samples, and HPLC was used as the reference method for cross-link concentrations. The correlation coefficients between the PLS regression models and the biochemical reference values were r = 0.84 ( p < 0.001 ), r = 0.87 ( p < 0.001 ) and r = 0.92 ( p < 0.001 ) for hydroxylysyl pyridinoline (HP), lysyl pyridinoline (LP), and pentosidine (Pent) cross-links, respectively. The study demonstrated that FTIR microspectroscopy is a feasible method for investigating cross-link concentrations in articular cartilage.
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Affiliation(s)
- Lassi Rieppo
- University of Oulu, Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, Oulu, FinlandbUniversity of Eastern Finland, Department of Applied Physics, Kuopio, Finland
| | - Harri T Kokkonen
- South Karelia Central Hospital, Department of Radiology, Lappeenranta, Finland
| | | | - Vuokko Kovanen
- University of Jyväskylä, Department of Health Sciences, Jyväskylä, Finland
| | - Mikko J Lammi
- Umeå University, Department of Integrative Medical Biology, Umeå, SwedenfHealth Science Center of Xi'an Jiaotong University, School of Public Health, Key Laboratory of Trace Elements and Endemic Diseases, National Health and Family Planning Commission, Xi'an, China
| | - Juha Töyräs
- University of Eastern Finland, Department of Applied Physics, Kuopio, FinlandgKuopio University Hospital, Diagnostic Imaging Center, Kuopio, Finland
| | - Simo Saarakkala
- University of Oulu, Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, Oulu, FinlandhOulu University Hospital, Department of Diagnostic Radiology, Oulu, FinlandiUniversity of Oulu and Oulu University Hospital, Medical Research Center Oulu, Oulu, Finland
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11
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Krause F, Wilke J, Vogt L, Banzer W. Intermuscular force transmission along myofascial chains: a systematic review. J Anat 2016; 228:910-8. [PMID: 27001027 DOI: 10.1111/joa.12464] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/11/2016] [Indexed: 01/08/2023] Open
Abstract
The present review aims to provide a systematic overview on tensile transmission along myofascial chains based on anatomical dissection studies and in vivo experiments. Evidence for the existence of myofascial chains is growing, and the capability of force transmission via myofascial chains has been hypothesized. However, there is still a lack of evidence concerning the functional significance and capability for force transfer. A systematic literature research was conducted using MEDLINE (Pubmed), ScienceDirect and Google Scholar. Studied myofascial chains encompassed the superficial backline (SBL), the back functional line (BFL) and the front functional line (FFL). Peer-reviewed human dissection studies as well as in vivo experiments reporting intermuscular tension transfer between the constituents of a myofascial chain were included. To assess methodic quality, two independent investigators rated studies by means of validated assessment tools (QUACS and PEDro Scale). The literature research identified 1022 articles. Nine studies (moderate to excellent methodological quality) were included. Concerning the SBL and the BFL, there is moderate evidence for force transfer at all three transitions (based on six studies), and one of two transitions (three studies). One study yields moderate evidence for a slight, but not significant force transfer at one transition in the FFL. The findings of the present study indicate that tension can be transferred between some of the examined adjacent structures. Force transfer might have an impact in overuse conditions as well as on sports performance. However, different methods of force application and measurement hinder the comparability of results. Considering anatomical variations in the degree of continuity and histological differences of the linking structures is crucial for interpretation. Future studies should focus on the in vivo function of myofascial continuity during isolated active or passive tissue tensioning.
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Affiliation(s)
- Frieder Krause
- Department of Sports Medicine, Goethe University Frankfurt/Main, Frankfurt am Main, Germany
| | - Jan Wilke
- Department of Sports Medicine, Goethe University Frankfurt/Main, Frankfurt am Main, Germany
| | - Lutz Vogt
- Department of Sports Medicine, Goethe University Frankfurt/Main, Frankfurt am Main, Germany
| | - Winfried Banzer
- Department of Sports Medicine, Goethe University Frankfurt/Main, Frankfurt am Main, Germany
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12
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Ling Y, Li C, Feng K, Duncan R, Eisma R, Huang Z, Nabi G. Effects of fixation and preservation on tissue elastic properties measured by quantitative optical coherence elastography (OCE). J Biomech 2016; 49:1009-1015. [PMID: 26903410 DOI: 10.1016/j.jbiomech.2016.02.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 01/21/2016] [Accepted: 02/05/2016] [Indexed: 11/25/2022]
Abstract
Fixed and preserved tissues have been massively used in the development of biomedical equipment and instrumentation. Not only the tissue morphology, but also its mechanical properties need to be considered in the fixation and preservation procedures since mechanical properties have significant influence on the design and performance of such instruments. Understanding the effects of storage and preservation conditions on the mechanical properties of soft tissue has both clinical and experimental significance. To this end, we aimed to study the effects of tissue preservation (by 10% formalin and Thiel fluids) on the elastic properties of five different kinds of fresh tissues from pig and chicken; specifically fat, liver, muscle, tendon and cartilage. The tissue elasticity was measured intensively and strictly within a controlled timeline of 6 months by quantitative optical coherence elastography (OCE) system. Our findings suggest that the elasticity change of tissues in the formalin solution has an ascending trend, but that of Thiel remains almost constant, providing a more real texture and properties.
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Affiliation(s)
- Yuting Ling
- Academic Section of Urology, Division of Imaging Technology, School of Medicine, University of Dundee, Dundee DD1 9SY, Scotland, UK; School of Engineering, Physics and Mathematics, University of Dundee, Dundee DD1 4HN, Scotland, UK
| | - Chunhui Li
- Academic Section of Urology, Division of Imaging Technology, School of Medicine, University of Dundee, Dundee DD1 9SY, Scotland, UK; School of Engineering, Physics and Mathematics, University of Dundee, Dundee DD1 4HN, Scotland, UK.
| | - Kairui Feng
- School of Engineering, Physics and Mathematics, University of Dundee, Dundee DD1 4HN, Scotland, UK
| | - Robyn Duncan
- Centers for Anatomy and Human Identification, College of Life Sciences, University of Dundee, Dundee DD1 4HN, UK
| | - Roos Eisma
- Centers for Anatomy and Human Identification, College of Life Sciences, University of Dundee, Dundee DD1 4HN, UK
| | - Zhihong Huang
- School of Engineering, Physics and Mathematics, University of Dundee, Dundee DD1 4HN, Scotland, UK
| | - Ghulam Nabi
- Academic Section of Urology, Division of Imaging Technology, School of Medicine, University of Dundee, Dundee DD1 9SY, Scotland, UK
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13
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Pascart T, Cortet B, Olejnik C, Paccou J, Migaud H, Cotten A, Delannoy Y, During A, Hardouin P, Penel G, Falgayrac G. Bone Samples Extracted from Embalmed Subjects Are Not Appropriate for the Assessment of Bone Quality at the Molecular Level Using Raman Spectroscopy. Anal Chem 2016; 88:2777-83. [DOI: 10.1021/acs.analchem.5b04400] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Tristan Pascart
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
- Department
of Rheumatology, Saint-Philibert Hospital, Lille University, 59160 Lomme, France
| | - Bernard Cortet
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Cecile Olejnik
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Julien Paccou
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Henri Migaud
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Anne Cotten
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Yann Delannoy
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
- Lille University, Taphonomy Unit, EA 7367, 59000 Lille, France
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14
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Wilke J, Engeroff T, Nürnberger F, Vogt L, Banzer W. Anatomical study of the morphological continuity between iliotibial tract and the fibularis longus fascia. Surg Radiol Anat 2015; 38:349-52. [PMID: 26522465 DOI: 10.1007/s00276-015-1585-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 10/26/2015] [Indexed: 01/26/2023]
Abstract
PURPOSE Recent research indicates that the skeletal muscles of the human body do not function as independent actuators. Instead, they seem to be linked by connective tissue forming myofascial chains. While the existence of such meridians has been demonstrated for the ventral and the dorsal side of the body, no data are available for morphological fusion of lateral muscles. This study aimed to provide evidence for the inferior part of the lateral myofascial chain. METHODS Fourteen legs (7 embalmed cadavers, four ♂, 86 ± 7 years) were dissected to reveal a potential myofascial continuity between the fibularis longus muscle, more detailed, its fascia, and the iliotibial tract (ITT). Three investigators judged the general existence as well as the degree and characteristics of the continuity. If an anatomical continuity was evident, strain was applied to both structures in order to evaluate the tissues' ability for tensile transmission. RESULTS An indirect connection between the iliotibial tract and the fascia of the fibularis longus muscle was found: in all examined legs, the ITT fused strongly with the crural fascia. The latter was hardly separable from the fibularis longus fascia. Application of strain to the ITT caused local movement in the crural fascia and the underlying fascia of the fibularis muscle. CONCLUSIONS The iliotibial tract fuses firmly with the crural fascia and the degree of continuity suggests that moderate amounts of strain might be transmitted. However, biomechanical studies precisely quantifying this tensile transmission are warranted in order to estimate the relevance of the linkage for the locomotor system.
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Affiliation(s)
- Jan Wilke
- Department Sports Medicine, Institute of Sports Sciences, Goethe University Frankfurt, Ginnheimer Landstraße 39, 60487, Frankfurt am Main, Germany.
| | - Tobias Engeroff
- Department Sports Medicine, Institute of Sports Sciences, Goethe University Frankfurt, Ginnheimer Landstraße 39, 60487, Frankfurt am Main, Germany
| | - Frank Nürnberger
- Department of Anatomy (II), Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Lutz Vogt
- Department Sports Medicine, Institute of Sports Sciences, Goethe University Frankfurt, Ginnheimer Landstraße 39, 60487, Frankfurt am Main, Germany
| | - Winfried Banzer
- Department Sports Medicine, Institute of Sports Sciences, Goethe University Frankfurt, Ginnheimer Landstraße 39, 60487, Frankfurt am Main, Germany
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15
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Pitzschke A, Lovisa B, Seydoux O, Haenggi M, Oertel MF, Zellweger M, Tardy Y, Wagnières G. Optical properties of rabbit brain in the red and near-infrared: changes observed under in vivo, postmortem, frozen, and formalin-fixated conditions. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:25006. [PMID: 25706688 DOI: 10.1117/1.jbo.20.2.025006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 01/29/2015] [Indexed: 05/05/2023]
Abstract
The outcome of light-based therapeutic approaches depends on light propagation in biological tissues, which is governed by their optical properties. The objective of this study was to quantify optical properties of brain tissue in vivo and postmortem and assess changes due to tissue handling postmortem. The study was carried out on eight female New Zealand white rabbits. The local fluence rate was measured in the VIS/NIR range in the brain in vivo, just postmortem, and after six weeks’ storage of the head at −20°C or in 10% formaldehyde solution. Only minimal changes in the effective attenuation coefficient μeff were observed for two methods of sacrifice, exsanguination or injection of KCl. Under all tissue conditions, μeff decreased with increasing wavelengths. After long-term storage for six weeks at −20°C, μeff decreased, on average, by 15 to 25% at all wavelengths, while it increased by 5 to 15% at all wavelengths after storage in formaldehyde. We demonstrated that μeff was not very sensitive to the method of animal sacrifice, that tissue freezing significantly altered tissue optical properties, and that formalin fixation might affect the tissue’s optical properties.)
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Affiliation(s)
- Andreas Pitzschke
- Swiss Federal Institute of Technology, Institute of Chemical Sciences and Engineering, Station 6, Lausanne CH-1015, Switzerland
| | - Blaise Lovisa
- Swiss Federal Institute of Technology, Institute of Chemical Sciences and Engineering, Station 6, Lausanne CH-1015, SwitzerlandbMedos International Sàrl, a J&J Company, Chemin Blanc 38, Le Locle CH-2400, Switzerland
| | - Olivier Seydoux
- Swiss Federal Institute of Technology, Institute of Chemical Sciences and Engineering, Station 6, Lausanne CH-1015, Switzerland
| | - Matthias Haenggi
- University of Bern, Department of Neurosurgery, Bern University Hospital, Inselspital, Bern CH-3010, Switzerland
| | - Markus F Oertel
- University of Bern, Department of Intensive Care Medicine, Bern University Hospital, Inselspital, Bern CH-3010, Switzerland
| | - Matthieu Zellweger
- Swiss Federal Institute of Technology, Institute of Chemical Sciences and Engineering, Station 6, Lausanne CH-1015, Switzerland
| | - Yanik Tardy
- Medos International Sàrl, a J&J Company, Chemin Blanc 38, Le Locle CH-2400, Switzerland
| | - Georges Wagnières
- Swiss Federal Institute of Technology, Institute of Chemical Sciences and Engineering, Station 6, Lausanne CH-1015, Switzerland
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16
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Hammer N, Löffler S, Bechmann I, Steinke H, Hädrich C, Feja C. Comparison of modified Thiel embalming and ethanol-glycerin fixation in an anatomy environment: Potentials and limitations of two complementary techniques. ANATOMICAL SCIENCES EDUCATION 2015; 8:74-85. [PMID: 24706536 DOI: 10.1002/ase.1450] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 01/29/2014] [Accepted: 03/11/2014] [Indexed: 06/03/2023]
Abstract
Thiel-fixed specimens have outstandingly lifelike visual and haptic properties. However, the original Thiel method is expensive and requires an elaborate setup. It is therefore of principal interest to modify the Thiel method in order to make it available to a broader user group. A modified Thiel embalming method will be described in detail and compared to ethanol-glycerin fixation with the help of illustrative examples. The visual properties, haptic properties, the usability for performing histological investigations, costs and potential health aspects will be considered. Tissues fixed with the modified Thiel technique gave results similar to the original method, providing more realistic visual and haptic properties than ethanol-glycerin embalming. However, Thiel fixation is significantly more expensive and requires more precautions to minimize potential health hazards than ethanol-glycerin-fixed tissues. In contrast to ethanol-glycerin-fixed specimens, the Thiel-fixed specimens are not suitable for histological investigations. Both modes of fixation are inappropriate for biomechanical testing. Modified Thiel embalming simplifies the availability of body donors with lifelike properties and has cost-saving advantages to the original technique. Thiel-embalmed body donors are ideally suited for clinical workshops but have restrictions for student dissection courses in facilities with limited storage space, air circulation or technical staff. Vice versa, ethanol-glycerin-fixed body donors are well suited for student dissection courses in such an environment but are limited in their use for clinical workshops. Modified Thiel embalming therefore ideally complements ethanol-glycerin fixation in order to provide customized solutions for clinical workshops and student dissection courses in a wide range of applications.
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Affiliation(s)
- Niels Hammer
- Institute of Anatomy, University of Leipzig, Faculty of Medicine, Leipzig, Germany
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17
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Matsuura T, Sasaki M, Katafuchi M, Tokutomi K, Mizumachi E, Makino M, Naito T, Sato H. Characterization of the bone matrix and its contribution to tooth loss in human cadaveric mandibles. Acta Odontol Scand 2014; 72:753-61. [PMID: 24694099 DOI: 10.3109/00016357.2014.903517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
OBJECTIVE It is uncertain as to what extent the major bone matrix constituents, mineral and collagen, show inter-individual variation and dependence on age and sex in jawbones. The purpose of this study was to clarify this uncertainty using cadaveric mandibles and investigate the association of bone matrix with the number of existing teeth. MATERIALS AND METHODS Cortical bone samples (1 × 1 cm) collected from the mental of 48 cadaveric mandibles (27 men and 21 women; age range = 56-93 years and 63-103 years, respectively) were used to quantify three bone matrix indices: mineral content, collagen content and extent of lysine hydroxylation of collagen. Associations with age and comparisons by sex were evaluated based on bone matrix indices and the numbers of existing teeth. The numbers of existing teeth were compared between the groups showing low and high bone matrix index values. RESULTS A great amount of inter-individual variation was seen in all bone matrix indices. No bone matrix indices were associated with age, while the number of existing teeth was negatively associated with age. The bone matrix indices and number of existing teeth did not differ by sex. The number of existing teeth was nearly twice as high in the group showing high collagen content as in the low collagen group; however, an analysis of covariance showed a significant inter-group difference not from bone matrix indices, but rather from age. Interestingly, in comparison to femoral collagen, mandibular collagen showed lower lysine hydroxylation, which can represent an aspect of bone quality. CONCLUSIONS Mandibular bone matrix shows great inter-individual variation and is independent of age and sex, but did not show as strong a relationship with tooth loss as age. Even so, mandibular collagen may represent a unique characteristic of bone matrix and deserves to be further investigated.
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Affiliation(s)
- Takashi Matsuura
- Section of Fixed Prosthodontics, Department of Oral Rehabilitation
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18
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Hanada M, Takahashi M, Suzuki D, Abe M, Matsuyama Y. A biochemical study of the distribution of collagen and its crosslinks in knee ligaments and the patellar tendon. Connect Tissue Res 2014; 55:378-83. [PMID: 25140988 DOI: 10.3109/03008207.2014.957283] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE The purpose of this study was to investigate biochemical differences in collagen crosslinks from different locations within the ligaments and a tendon of the human knee. MATERIALS AND METHODS The anterior cruciate ligament (ACL), posterior cruciate ligament (PCL), medial collateral ligament (MCL), lateral collateral ligament (LCL), and patellar tendon (PT) were obtained from 24 cadavers (13 men and 11 women) whose average age at the time of death was 84.8 years. Ligaments and PT samples were obtained from the femoral and tibial insertions and the midsubstance. Hydroxyproline (Hyp) and collagen crosslinks, including pyridinoline (Pyr) and pentosidine (Pen), were compared among the different sites. RESULTS The midsubstance Hyp concentration was greater than at the femoral and tibial insertions in the ACL (p = 0.00124 and 0.000255, respectively) and PCL (p = 0.00036 and 0.042, respectively). The Pyr:collagen ratio did not differ among sites in any of the ligaments or PT. The Pen:collagen ratio at the midsubstance was greater than at the femoral and tibial insertions in the ACL (p = 0.00022 and 0.00025, respectively) and LCL (p = 0.000081 and 0.000021, respectively) and was greater at the femoral insertion in the MCL (p = 0.00010). CONCLUSIONS The mature collagen crosslink Pyr was not different in distribution in knee ligaments and the PT. Pen increased at the midsubstance ligaments and the PT. As increased Pen may represent ligament degeneration, this may indicate that degeneration may progress more rapidly at the midsubstance than at the insertion sites of a ligament.
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Affiliation(s)
- Mitsuru Hanada
- Department of Orthopaedic Surgery, Hamamatsu University School of Medicine , Hamamatsu, Shizuoka , Japan and
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19
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Ethanol and formaldehyde fixation irreversibly alter bones' organic matrix. J Mech Behav Biomed Mater 2014; 29:252-8. [DOI: 10.1016/j.jmbbm.2013.09.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 08/21/2013] [Accepted: 09/02/2013] [Indexed: 11/21/2022]
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20
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Steinke H, Lingslebe U, Böhme J, Slowik V, Shim V, Hädrich C, Hammer N. Deformation behavior of the iliotibial tract under different states of fixation. Med Eng Phys 2012; 34:1221-7. [DOI: 10.1016/j.medengphy.2011.12.009] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Revised: 12/09/2011] [Accepted: 12/14/2011] [Indexed: 01/14/2023]
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21
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Rouleau L, Tremblay D, Cartier R, Mongrain R, Leask RL. Regional variations in canine descending aortic tissue mechanical properties change with formalin fixation. Cardiovasc Pathol 2012; 21:390-7. [DOI: 10.1016/j.carpath.2011.12.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2010] [Revised: 10/17/2011] [Accepted: 12/15/2011] [Indexed: 11/16/2022] Open
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22
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Wood MFG, Vurgun N, Wallenburg MA, Vitkin IA. Effects of formalin fixation on tissue optical polarization properties. Phys Med Biol 2011; 56:N115-22. [DOI: 10.1088/0031-9155/56/8/n01] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Sasaki M, Matsuura T, Katafuchi M, Tokutomi K, Sato H. Higher Contents of Mineral and Collagen but Lower of Hydroxylysine of Collagen in Mandibular Bone Compared with Those of Humeral and Femoral Bones in Human. J HARD TISSUE BIOL 2010. [DOI: 10.2485/jhtb.19.175] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Cömert A, Kökat AM, Akkocaoğlu M, Tekdemir İ, Akça K, Çehreli MC. Fresh-frozen vs. embalmed bone: is it possible to use formalin-fixed human bone for biomechanical experiments on implants? Clin Oral Implants Res 2009; 20:521-5. [DOI: 10.1111/j.1600-0501.2008.01682.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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25
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Yan D, Zhou G, Zhou X, Liu W, Zhang WJ, Luo X, Zhang L, Jiang T, Cui L, Cao Y. The impact of low levels of collagen IX and pyridinoline on the mechanical properties of in vitro engineered cartilage. Biomaterials 2009; 30:814-21. [DOI: 10.1016/j.biomaterials.2008.10.042] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Accepted: 10/21/2008] [Indexed: 11/30/2022]
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26
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Suzuki D, Takahashi M, Abe M, Nagano A. Biochemical study of collagen and its crosslinks in the anterior cruciate ligament and the tissues used as a graft for reconstruction of the anterior cruciate ligament. Connect Tissue Res 2008; 49:42-7. [PMID: 18293177 DOI: 10.1080/03008200701820799] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Among tissue grafts used for reconstruction of the anterior cruciate ligament (ACL), the pateller tendon (PT) and semitendinosus tendon (ST) are commonly used. It was thought that there were differences in the biochemical composition and process of healing between PT and ST. The aim of this study was to investigate the biochemical difference between ACL and the graft tissues used for reconstruction of the ACL. Hydroxyproline and crosslinks of collagen and elastin were measured from samples of 29 knees from cadavers preserved in formalin solutions. The results of measurements were hydroxyproline: ACL 0.522, PT 0.577, ST 0.463 (micromol/mg dry weight); pyridinoline/collagen: ACL 0.381, PT 0.272, ST 0.244 (mol/mol); and pentosidine/collagen: ACL 0.0434, PT 0.0558, ST 0.0799 (mol/mol). The biochemical properties of PT was not so different from ST. Pentosidine also was measured in the present study to aid in the comparison of the ligament and tendons of the knee joint.
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Affiliation(s)
- Daisuke Suzuki
- Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Hamamatsu, Japan.
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27
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Viglio S, Annovazzi L, Luisetti M, Stolk J, Casado B, Iadarola P. Progress in the methodological strategies for the detection in real samples of desmosine and isodesmosine, two biological markers of elastin degradation. J Sep Sci 2007; 30:202-13. [PMID: 17390614 DOI: 10.1002/jssc.200600260] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Desmosines are crosslinking amino acids unique to mature elastin in humans. Owing to this unicity, they have been discussed as potentially attractive indicators of connective tissue disorders whose clinical manifestations are mostly the result of elastin degradation. This review covers advances in immunochemical, chromatographic, and electrophoretic procedures applied in the last 25 years to detect and quantitate these crosslinksin a variety of biological samples. Recent applications of CE with LIF detection (CE-LIF) for investigating the content of desmosines in different fluids will also be discussed.
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Affiliation(s)
- Simona Viglio
- Dipartimento di Biochimica "A. Castellani", Università di Pavia, Italy
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28
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Majumder SK, Ghosh N, Gupta PK. N2 laser excited autofluorescence spectroscopy of formalin-fixed human breast tissue. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2005; 81:33-42. [PMID: 16107317 DOI: 10.1016/j.jphotobiol.2005.06.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/01/2005] [Revised: 05/24/2005] [Accepted: 06/09/2005] [Indexed: 10/25/2022]
Abstract
The paper reports results of an in vitro study on autofluorescence spectroscopy of fresh and formalin-fixed human breast tissue samples to investigate the effect of formalin fixation on the measured autofluorescence spectra. It also explores the applicability of the approach in discriminating cancerous from the uninvolved sites of the formalin-fixed breast tissues based on their autofluorescence spectra. A probability-based diagnostic algorithm, making use of the theory of relevance vector machine (RVM), a powerful recent approach for statistical pattern recognition, was developed for that purpose. The algorithm provided sensitivity values of up to 97% and specificity values of up to 100% towards cancer for both the independent validation data set as well as for the training data set based on leave-one-out cross-validation. These results suggest that autofluorescence spectroscopy may prove to be a valuable additional in vitro diagnostic modality in clinical pathology setting for discriminating cancerous tissue sites from normal sites.
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Affiliation(s)
- S K Majumder
- Biomedical Applications Section, R&D Block-D, Centre for Advanced Technology, Indore 452013, India.
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29
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Brasselet C, Durand E, Addad F, Al Haj Zen A, Smeets MB, Laurent-Maquin D, Bouthors S, Bellon G, de Kleijn D, Godeau G, Garnotel R, Gogly B, Lafont A. Collagen and elastin cross-linking: a mechanism of constrictive remodeling after arterial injury. Am J Physiol Heart Circ Physiol 2005; 289:H2228-33. [PMID: 15951346 DOI: 10.1152/ajpheart.00410.2005] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Constrictive remodeling after arterial injury is related to collagen accumulation. Cross-linking has been shown to induce a scar process in cutaneous wound healing and is increased after arterial injury. We therefore evaluated the effect of cross-linking inhibition on qualitative and quantitative changes in collagen, elastin, and arterial remodeling after balloon injury in the atherosclerotic rabbit model. Atherosclerotic-like lesions were induced in femoral arteries of 28 New Zealand White rabbits by a combination of air desiccation and a high-cholesterol diet. After 1 mo, balloon angioplasty was performed in both femoral arteries. Fourteen rabbits were fed beta-aminopropionitrile (beta-APN, 100 mg/kg) and compared with 14 untreated animals. The remodeling index, i.e., the ratio of external elastic lamina at the lesion site to external elastic lamina at the reference site, was determined 4 wk after angioplasty for both groups. Pyridinoline was significantly decreased in arteries from beta-APN-treated animals compared with controls, confirming inhibition of collagen cross-linking: 0.30 (SD 0.03) and 0.52 (SD 0.02) mmol/mol hydroxyproline, respectively (P = 0.002). Scanning and transmission electron microscopy showed a profound disorganization of collagen fibers in arteries from beta-APN-treated animals. The remodeling index was significantly higher in beta-APN-treated than in control animals [1.1 (SD 0.3) vs. 0.8 (SD 0.3), P = 0.03], indicating favorable remodeling. Restenosis decreased by 33% in beta-APN-treated animals: 32% (SD 16) vs. 48% (SD 24) (P = 0.02). Neointimal collagen density was significantly lower in beta-APN-treated animals than in controls: 23.0% (SD 3.8) vs. 29.4% (SD 4.0) (P = 0.004). These findings suggest that collagen and elastin cross-linking plays a role in the healing process via constrictive remodeling and restenosis after balloon injury in the atherosclerotic rabbit model.
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Affiliation(s)
- Camille Brasselet
- INSERM E0016, Faculté de Médecine Paris V, Université René Descartes, France
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