scholarly journals Chitosan Based Biocomposites for Hard Tissue Engineering

2021 ◽  
Author(s):  
Fouad Dabbarh ◽  
Noureddin Elbakali-Kassimi ◽  
Mohammed Berrada
Keyword(s):  
Type I Collagen ◽  
Soft Tissues ◽  
Calcium Phosphates ◽  
Low Cost ◽  
Type I ◽  
Hard Tissue ◽  
Structural Support ◽  
Bone Substitute Materials ◽  
Autologous Bone ◽  
Hard Tissue Engineering

Bone is the second most transplanted organ, just after blood. It provides structural support, protection for organs and soft tissues. It holds some critical biological processes such as the bone marrow blood forming system. It is responsible for storing and supplying minerals such calcium and phosphate. Bone is a connective tissue formed by two predominant phases: an inorganic phase containing mainly apatitic calcium and phosphate and an organic phase made of fibrous type I collagen. This natural biocomposite has many biological features such osteoconductivity, osteoinductivity, osteogenicity and is subject to a continuous remodeling process through osteoclastic and osteoblastic activities. In biomedical engineering, the restoration of damaged hard tissue with autologous bone is not always possible or even the best option. The development of some safe and low-cost alternatives such as biocomposites that mimic organic and calcified bone materials have shown very good results and offer an alternative to autologous bone implants. However, the mechanical properties of biocomposites still present a big challenge as a hard tissue substitute. This chapter reviews the properties of bone substitute materials chitosan and calcium phosphates, discusses strategies used in the treatment of calcified hard tissues as well as new approaches developed in this field.

scholarly journals Racemization and isomerization of type I collagen C-telopeptides in human bone and soft tissues: assessment of tissue turnover

2000 ◽  
Vol 345 (3) ◽  
pp. 481-485 ◽  
Author(s):  
Evelyne GINEYTS ◽  
Paul A. C. CLOOS ◽  
Olivier BOREL ◽  
Laurent GRIMAUD ◽  
Pierre D. DELMAS ◽  
...  
Keyword(s):  
Bone Resorption ◽  
Type I Collagen ◽  
Soft Tissues ◽  
Systematic Evaluation ◽  
Specific Marker ◽  
Type I ◽  
Aspartic Acid Residue ◽  
Post Translational Modifications ◽  
High Degree

Urinary excretion of the type I collagen C-telopeptide (CTx) has been shown to be a sensitive index of the rate of bone resorption. The human type I collagen sequence A1209HDGGR1214 of CTx can undergo racemization of the aspartic acid residue Asp1211 and isomerization of the bond between this residue and Gly1212. These spontaneous non-enzymic chemical reactions takes place in vivo in bone, and the degree of racemization and isomerization of CTx molecules may be an index of the biological age and the remodelling of bone. The aim of the present study was to investigate the degree of racemization and isomerization of type I collagen in human connective soft tissues, in order to estimate the rate of collagen turnover in adult tissues and compare it with that of bone. We also performed a systematic evaluation of the pyridinium cross-link content in adult human tissues. Using antibodies raised against the different CTx forms, we found that bone and dermis are the tissues that show most racemization and isomerization. The type I collagen of arteries, lung, intestine, kidney, skeletal muscle and heart shows significantly less racemization and isomerization than that of bone, suggesting that these soft tissues have a faster turnover than bone. We also found that pyridinoline and, to a lesser degree, deoxypyridinoline are distributed throughout the different tissues investigated. Because bone type I collagen is characterized by a high degree of both racemization/isomerization and deoxypyridinoline cross-linking, the concomitant assessment of these two post-translational modifications is likely to result in a highly specific marker of bone resorption.

scholarly journals Treatment with type-I collagen scaffolds in patients with venous ulcers. Case report

Case reports ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 128-136
Author(s):  
Martha Isabel González-Duque ◽  
Julián Daniel Hernández-Martínez ◽  
Marta Raquel Fontanilla ◽  
Sofía Elizabeth Muñoz-Medina
Keyword(s):  
Type I Collagen ◽  
Low Cost ◽  
Adult Population ◽  
Lower Limbs ◽  
Collagen Membrane ◽  
Type I ◽  
Dermal Substitute ◽  
Collagen Scaffolds ◽  
Venous Ulcers

Introduction: Chronic venous insufficiency affects about 5% of the global adult population. Venous leg ulcers are one of the most frequent complications of this pathology, with a global prevalence of 2%. This disease affects both the quality of life of patients and, due to the high cost of the treatment, the health system. Compressive therapy and moist wound healing have been the gold standard treatment. However, when complications occur, they may not be effective.Case report: This is the case of a 66-year-old female patient with venous ulcers on her lower limbs and symptoms of fever and local pain that did not respond to conventional therapies. The patient was treated with a new dermal substitute made of an acellular type-I collagen membrane, which promotes the closure of the ulcer by stimulating the replacement of injured tissue with tissue similar to the healthy one. The condition of the patient improved at 16 weeks, and after 8 months of treatment there was no recurrence of the lesions.Conclusions: Acellular type-I collagen membrane developed by the Tissue Engineering Working Group of the Department of Pharmacy of the Universidad Nacional de Colombia is effective in treating venous ulcers of the lower limbs. Its low cost facilitates the access of the whole population to therapies based on its application.

Radioimmunoassay of the carboxyterminal propeptide of human type I procollagen

1990 ◽  
Vol 36 (7) ◽  
pp. 1328-1332 ◽  
Author(s):  
J Melkko ◽  
S Niemi ◽  
L Risteli ◽  
J Risteli
Keyword(s):  
Type I Collagen ◽  
Soft Tissues ◽  
Polyacrylamide Gel Electrophoresis ◽  
Primary Cultures ◽  
Sodium Dodecyl ◽  
Type I ◽  
Lectin Affinity Chromatography ◽  
Human Type ◽  
Serum Antigen ◽  
Type I Procollagen

Abstract Type I collagen is the most abundant collagen type in soft tissues and the only type found in mineralized bone. We established a rapid equilibrium radioimmunoassay for the carboxyterminal propeptide of human type I procollagen (PICP), to be used as an indicator of the synthesis of type I collagen. We isolated type I procollagen from the medium of primary cultures of human skin fibroblasts, digested the protein with highly purified bacterial collagenase, and purified PICP by lectin-affinity chromatography, gel filtration, and ion-exchange separation on HPLC. The purity of the protein was verified by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and by N-terminal amino acid sequencing of its component chains. The final radioimmunoassay was established with polyclonal rabbit antibodies. Material antigenically related to PICP is readily detected in human serum. There is only one form of the serum antigen, its molecular size and affinity to the antibodies being similar to those of the isolated propeptide. Intra- and interassay CVs are 3% and 5%, respectively. Preliminary reference intervals for healthy adults (18 to 61 years of age) are 38-202 micrograms/L for men and 50-170 micrograms/L for women: in men the concentration is inversely related to age. The serum antigen is stable during storage and after repeated thawing.

Collagen-Agarose Co-Gels as a Model for Collagen-Matrix Interaction in Soft Tissue

2011 ◽  
Author(s):  
Spencer P. Lake ◽  
Sadie Doggett ◽  
Victor H. Barocas
Keyword(s):  
Collagen Fiber ◽  
Type I Collagen ◽  
Soft Tissues ◽  
Experimental System ◽  
Model System ◽  
Type I ◽  
Collagen Gels ◽  
Fiber Network ◽  
Fibrillar Material

Connective soft tissues have complex mechanical properties that are determined by their collagen fiber network and surrounding non-fibrillar material. The mechanical role of non-fibrillar material and the nature of its interaction with the collagen network remain poorly understood, in part because of the lack of a simple experimental model system to examine and quantify these properties. The development of a simple but representational experimental system will allow for greater insight into the interaction between fibers and the non-fibrillar matrix. Reconstituted Type I collagen gels are an attractive model tissue for exploring micro- and macroscale relationships between constituents (e.g., [1–2]), but standard collagen gels lack the non-fibrillar components (i.e., proteoglycan, minor collagens, etc.) present in native tissue. A recent study [3] added low quantities of agarose to collagen gels, which dramatically increased the shear storage modulus with minimal changes to the collagen fiber network. In this study, we suggest that collagen-agarose co-gels can serve as a model system to investigate the mechanical role of non-fibrillar ECM. Even though agarose is relatively compliant at low concentrations, and collagen fibers are very stiff in tension, we hypothesized that the presence of agarose in co-gels would have a pronounced effect on structural response and mechanical behavior in tensile loading. Therefore, the objective of this study was to examine the properties of collagen-agarose co-gels to understand better the nature of, and the relationships between, the collagen fiber network and non-fibrillar matrix of simplified tissue analogs.

Effects of fluoride on the ultrastructure and expression of Type I collagen in rat hard tissue

Chemosphere ◽  
2015 ◽  
Vol 128 ◽  
pp. 36-41 ◽  
Author(s):  
Xiaoyan Yan ◽  
Xianhui Hao ◽  
Qingli Nie ◽  
Cuiping Feng ◽  
Hongwei Wang ◽  
...  
Keyword(s):  
Type I Collagen ◽  
Type I ◽  
Hard Tissue

Morphometry of the extremely thin pulmonary blood-gas barrier in the chicken lung

2007 ◽  
Vol 292 (3) ◽  
pp. L769-L777 ◽  
Author(s):  
Rebecca R. Watson ◽  
Zhenxing Fu ◽  
John B. West
Keyword(s):  
Type I Collagen ◽  
Arithmetic Mean ◽  
Type I ◽  
Blood Gas ◽  
Gas Barrier ◽  
Structural Support ◽  
Pulmonary Capillaries ◽  
Mammalian Lung ◽  
Avian Lung ◽  
To Come

The gas exchanging region in the avian lung, although proportionally smaller than that of the mammalian lung, efficiently manages respiration to meet the high energetic requirements of flapping flight. Gas exchange in the bird lung is enhanced, in part, by an extremely thin blood-gas barrier (BGB). We measured the arithmetic mean thickness of the different components (endothelium, interstitium, and epithelium) of the BGB in the domestic chicken lung and compared the results with three mammals. Morphometric analysis showed that the total BGB of the chicken lung was significantly thinner than that of the rabbit, dog, and horse (54, 66, and 70% thinner, respectively) and that all layers of the BGB were significantly thinner in the chicken compared with the mammals. The interstitial layer was strikingly thin in the chicken lung (∼86% thinner than the dog and horse, and 75% thinner than rabbit) which is a paradox because the strength of the BGB is believed to come from the interstitium. In addition, the thickness of the interstitium was remarkably uniform, unlike the mammalian interstitium. The uniformity of the interstitial layer in the chicken is attributable to a lack of the supportive type I collagen cable that is found in mammalian alveolar lungs. We propose that the surrounding air capillaries provide additional structural support for the pulmonary capillaries in the bird lung, thus allowing the barrier to be both very thin and extremely uniform. The net result is to improve gas exchanging efficiency.

scholarly journals Biomineralization and Biomaterial Considerations in Dentin Remineralization

2016 ◽  
Vol 1 (1) ◽  
pp. 7-12 ◽  
Author(s):  
Xu Zhang ◽  
Zuohui Xiao ◽  
Haorong Wang ◽  
Anil Kishen
Keyword(s):  
Minimally Invasive ◽  
Type I Collagen ◽  
Organic Matrix ◽  
Type I ◽  
Hard Tissue ◽  
The Past ◽  
Organic Matrices ◽  
Caries Management ◽  
Inorganic Matrix ◽  
Demineralized Dentin

ABSTRACT Dentin is a composite hard tissue, comprising of inorganic and organic matrices, and regulated by many proteins during development. The demineralization of dentin results from the loss of inorganic matrix [mainly hydroxyapatite (HAP)], but the organic matrix (mainly type I collagen) will sustain for a period of time after demineralization. Over the past decade, there has been a growing interest on the remineralization of demineralized dentin, primarily in connection with minimally invasive caries management. More and more biomaterials and methods are currently being evaluated to achieve newer approaches for the remineralization of demineralized dentin. These strategies are mostly based on biomimetic approaches and aim to achieve the characteristics of natural hard tissue. This article will present a complete review on the basic compositions and properties of dentin, which formed the basis for the biomimetic remineralization of demineralized dentin. How to cite this article Zhang X, Xiao Z, Wang H, Kishen A. Biomineralization and Biomaterial Considerations in Dentin Remineralization. J Oper Dent Endod 2016;1(1):7-12.

scholarly journals Biological Properties of Calcium Phosphate Bioactive Glass Composite Bone Substitutes: Current Experimental Evidence

2019 ◽  
Vol 20 (2) ◽  
pp. 305 ◽  
Author(s):  
Maria Karadjian ◽  
Christopher Essers ◽  
Stefanos Tsitlakidis ◽  
Bruno Reible ◽  
Arash Moghaddam ◽  
...  
Keyword(s):  
Bone Substitute ◽  
Calcium Phosphates ◽  
Donor Site ◽  
Bone Substitutes ◽  
Biological Properties ◽  
Recent Experimental Data ◽  
Bone Substitute Materials ◽  
Autologous Bone ◽  
Substitute Materials ◽  
Composite Bone

Standard treatment for bone defects is the biological reconstruction using autologous bone—a therapeutical approach that suffers from limitations such as the restricted amount of bone available for harvesting and the necessity for an additional intervention that is potentially followed by donor-site complications. Therefore, synthetic bone substitutes have been developed in order to reduce or even replace the usage of autologous bone as grafting material. This structured review focuses on the question whether calcium phosphates (CaPs) and bioactive glasses (BGs), both established bone substitute materials, show improved properties when combined in CaP/BG composites. It therefore summarizes the most recent experimental data in order to provide a better understanding of the biological properties in general and the osteogenic properties in particular of CaP/BG composite bone substitute materials. As a result, BGs seem to be beneficial for the osteogenic differentiation of precursor cell populations in-vitro when added to CaPs. Furthermore, the presence of BG supports integration of CaP/BG composites into bone in-vivo and enhances bone formation under certain circumstances.

scholarly journals Multiscale Model Predicts Tissue-Level Failure From Collagen Fiber-Level Damage

2012 ◽  
Vol 134 (9) ◽  
Author(s):  
Mohammad F. Hadi ◽  
Edward A. Sander ◽  
Victor H. Barocas
Keyword(s):  
Type I Collagen ◽  
Soft Tissues ◽  
Mechanical Response ◽  
Collagen Gel ◽  
Multiscale Model ◽  
Tissue Level ◽  
Type I ◽  
Collagen Gels ◽  
Damage And Failure ◽  
Failure Data

Excessive tissue-level forces communicated to the microstructure and extracellular matrix of soft tissues can lead to damage and failure through poorly understood physical processes that are multiscale in nature. In this work, we propose a multiscale mechanical model for the failure of collagenous soft tissues that incorporates spatial heterogeneity in the microstructure and links the failure of discrete collagen fibers to the material response of the tissue. The model, which is based on experimental failure data derived from different collagen gel geometries, was able to predict the mechanical response and failure of type I collagen gels, and it demonstrated that a fiber-based rule (at the micrometer scale) for discrete failure can strongly shape the macroscale failure response of the gel (at the millimeter scale). The model may be a useful tool in predicting the macroscale failure conditions for soft tissues and engineered tissue analogs. In addition, the multiscale model provides a framework for the study of failure in complex fiber-based mechanical systems in general.

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