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Endothelial Cells Regulate The Functions Of Dental Pulp Stem Cells In Stabilizing The Newly Formed Blood Vessels
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Book Synopsis Endothelial Cells Regulate the Functions of Dental Pulp Stem Cells in Stabilizing the Newly Formed Blood Vessels by : 张雨陈
Download or read book Endothelial Cells Regulate the Functions of Dental Pulp Stem Cells in Stabilizing the Newly Formed Blood Vessels written by 张雨陈 and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synergistic Effects of Dental Pulp Stem Cells and Endothelial Cells in Pulp Regeneration by : Waruna Lakmal Dissanayaka
Download or read book Synergistic Effects of Dental Pulp Stem Cells and Endothelial Cells in Pulp Regeneration written by Waruna Lakmal Dissanayaka and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Synergistic Effects of Dental Pulp Stem Cells and Endothelial Cells in Pulp Regeneration" by Waruna Lakmal, Dissanayaka, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Regeneration of the tissues to replace diseased, missing and traumatized dentin/pulp requires combining the recent progress in stem cell and tissue engineering research. Dental pulp stem cells (DPSCs) are considered as a promising population of cells in regenerative dentistry and shown to be able to produce dentin/pulp-like tissues following implantation in-vivo. Securing a good blood supply is critical in pulp regeneration, however, this is a challenging task due to the unique structure of the tooth, the anatomy of which permits only a microcirculatory system via a very small apical opening (In this study, for the first time, synergistic effects of DPSCs and human umbilical vein endothelial cells (HUVECs) on osteo/odontogenic differentiation and angiogenesis were investigated using two-dimensional and three-dimensional direct co-culture systems. Furthermore, the potential of three-dimensional DPSC constructs prevascularized with HUVECs in dental pulp regeneration in-vivo was exmined. HUVECs promoted odonto/osteogenic differentiation of DPSCs in direct two-dimensional co-cultures in-vitro. Further, addition of DPSCs stabilized the pre-existing vessel-like structures formed by HUVECs and increased the longevity of these structures on matrigel in-vitro. Using two different systems, scaffold-free self-assembling microtissue spheroids and peptide hydrogel scaffold, the interactions of DPSCs and HUVECs in three-dimensional cultures were investigated. The results demonstrated that DPSCs can self assemble into three-dimensional microtissue spheroids when cultured alone or with HUVECs. DPSCs promoted survival and vascular structure formation by HUVECs both in scaffold-free microtissue spheroids and peptide hydrogel scaffold. In contrast, HUVECs, when cultured alone, neither formed vascular structures nor survived in either of the 3D systems. The latter phenomenon was attributable to vascular endothelial growth factor secreted by DPSCs, a major factor responsible for endothelial function. Co-cultures also showed enhanced odonto/osteogenic differentiation in both three-dimensional microtissue spheroid and peptide hydrogel scaffold systems. Following implantation of tooth-root fragments filled with three-dimensional DPSC constructs into the subcutaneous space of immunodefficient mice, vascularised pulp-like tissue was regenerated within the root canals. Compared to DPSC-only group, DPSC/HUVEC co-culture groups showed higher vascularisation, extracellular matrix formation and mineralization in regenerated tissue. More importantly, HUVEC-lined vascular lumens were observed in regenerated tissues suggesting the successful integration of in-vitro formed pre-vascular structures to the host vasculature. In summary, the findings suggest that DPSCs and HUVECs display significant synergy during odonto/osteogenic differentiation and ang
Book Synopsis The Vascular Niche in Tissue Repair: A Therapeutic Target for Regeneration by : Francisco J. Rivera
Download or read book The Vascular Niche in Tissue Repair: A Therapeutic Target for Regeneration written by Francisco J. Rivera and published by Frontiers Media SA. This book was released on 2018-03-13 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tissues and organs have, although sometimes limited, the capacity for endogenous repair, which is aimed to re-establish integrity and homeostasis. Tissue repair involves pro- and anti-inflammatory processes, new tissue formation and remodelling. Depending on the local microenvironment, tissue repair results either in scar tissue formation or in regeneration. The latter aims to recapitulate the original tissue structure and architecture with the proper functionality. Although some organisms (such as planarians) have a high regenerative capacity throughout the body, in humans this property is more restricted to a few organs and tissues. Regeneration in the adult is possible in particular through the existence of tissue-resident pools of stem/progenitor cells. In response to tissue damage, these cells are activated, they proliferate and migrate, and differentiate into mature cells. Angiogenesis and neovascularization play a crucial role in tissue repair. Besides providing with oxygen and nutrients, angiogenesis generates a vascular niche (VN) consisting of different blood-derived elements and endothelial cells surrounded by basement membrane as well as perivascular cells. The newly generated VN communicates with the local stem/progenitor cells and contributes to tissue repair. For example, platelets, macrophages, neutrophils, perivascular cells and other VN components actively participate in the repair of skin, bone, muscle, tendon, brain, spinal cord, etc. Despite these observations, the exact role of the VN in tissue repair and the underlying mechanisms are still unclear and are awaiting further evidence that, indeed, will be required for the development of regenerative therapies for the treatment of traumatic injuries as well as degenerative diseases.
Book Synopsis Characterization of Dental Pulp Stem Cells and Their Potential Clinical Applications by : Kajohnkiart Janebodin
Download or read book Characterization of Dental Pulp Stem Cells and Their Potential Clinical Applications written by Kajohnkiart Janebodin and published by . This book was released on 2013 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dental pulp stem cells (DPSCs) were first isolated and characterized from human teeth and most studies have focused on using human DPSCs for dentin regeneration. However, mouse DPSCs have not been well characterized and their origin(s) have not yet been elucidated. I examined if murine DPSCs are neural crest derived and determined their in vitro and in vivo capacity. DPSCs from neonatal mice expressed embryonic stem cell and neural crest genes, but lacked expression of mesodermal genes. Cells isolated from the Wnt1-Cre/R26R-LacZ mouse, a reporter of neural crest-derived tissues, indicated that DPSCs were Wnt1-marked and therefore of neural crest origin. Clonal DPSCs showed multi-differentiation in neural crest lineage for odontoblasts, chondrocytes, adipocytes, neurons, and smooth muscles. In vivo subcutaneous transplantation with hydroxyapatite/tricalcium phosphate, based on tissue/cell morphology and specific antibody staining, revealed that the clones differentiated into odontoblast-like cells and produced dentin/pulp-like structure. Conversely, femur-derived bone marrow stromal cells (BMSCs) gave rise to osteoblast-like cells and generated bone-like structure. Interestingly, the capillary distribution in the DPSC transplants showed close proximity to odontoblasts whereas in the BMSC transplants bone condensations were distant to capillaries resembling dentinogenesis in the former vs. osteogenesis in the latter. Loss of functional salivary gland causes patients' moribidities from difficulties in swallowing and speech, as well as oral diseases. Stem cell therapy is considered a potential therapeutic alternative. However, combinatory approaches including not only salivary gland stem cells but also supportive cells and appropriate extracellular matrix are necessary to form a functional salivary gland. Like tooth formation, the development of salivary gland requires epithelium interacting with neural crest-derived mesenchyme. I used the human salivary gland (HSG) cell line as a model to study the effects of DPSCs on salivary gland differentiation. In vitro differentiation on matrigel showed that HSG alone and HSG co-cultured with Wnt1-Cre/R26R-LacZ derived DPSCs (HSG+DPSC) differentiated into acinar-like structures. However, HSG formed more mature (higher expression of LAMP-1 and CD44), larger and increased numbers of acini in HSG+DPSC. Subcutaneous co-transplantation of HSG and DPSCs with hyaluronic acid (HA) hydrogels after 2 weeks was evaluated by Q-RT-PCR, morphology and immunohistology. Compared to HSG transplants which only showed undifferentiated tumor-like cells, HSG+DPSC demonstrated (1) higher expression of murine mesenchymal marker Fgf-7, (2) higher expression of mature human salivary gland differentiation marker alpha-amylase-1 (AMY-1), (3) higher expression of murine endothelial, vWF, neuronal, NF-200, and angiogenic markers, Vegfr-3 and Vegf-c, (4) mucin-secreting acinar- and duct-like structures with abundant blood vessels at the interface with DPSCs, and (5) more mature glandular structures double-positive for salivary gland differentiation markers CD44 and LAMP-1. These results indicate that DPSCs supported and enhanced HSG differentiation into functional salivary gland tissue. In addition, DPSCs have previously demonstrated potential pericyte-like topography and function. However, the mechanisms regulating their pericyte function are still yet to be elucidated. DPSC angiogenic and pericyte function were investigated Tie2-GFP derived dental pulp cells were negative for GFP driven by the endothelial Tie2 transgene, indicating an absence of endothelial cells. Endothelial cells co-cultured with DPSCs formed more mature in vitro tube-like structures as compared to those co-cultured with BMSCs. Many DPSCs were located adjacent to vascular tubes, suggesting a pericyte location and function. In vivo DPSCs subcutaneously transplanted in matrigel (MG) (DPSC-MG) induced more vessel formation than BMSC-MG. DPSCs expressed higher Vegfd, Vegfr3, EphrinB2 levels. Soluble Flt (sFlt), an angiogenic inhibitor that binds VEGF-A, significantly decreased the amount of blood vessels in DPSC-MG, but not in BMSC-MG. sFlt inhibited VEGFR2 and downstream ERK signaling and down-regulated Vegfa, Vegf receptors and EphrinB2 expression in DPSCs. Therefore, DPSC-induced angiogenesis is VEGF-dependent. DPSCs enhance angiogenesis by secreting VEGF-A, -C, -D and forming tight associations with vessels, resembling pericyte-like cells. Taken together, I demonstrate the existence of neural crest-derived DPSCs with differentiation capacity into cranial mesenchymal tissues and other neural crest-derived tissues. I also illustrate the potential of DPSCs as inductive mesenchyme for salivary gland regeneration, repair, and tissue engineering, and provide first insights into the mechanism(s) of DPSC angiogenic capacity and their function as pericytes. DPSCs hold promise as a stem cell source for regenerating neural crest derived tissues, and the trophic and angiogenic properties of DPSCs also highlight this stem cell source useful for tissue regeneration.
Book Synopsis Dental Stem Cells: Regenerative Potential by : Barbara Zavan
Download or read book Dental Stem Cells: Regenerative Potential written by Barbara Zavan and published by Humana Press. This book was released on 2016-07-25 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the basic aspects of dental stem cells (DSCs) as well as their clinical applications in tissue engineering and regenerative medicine. It opens with a discussion of classification, protocols, and properties of DSCs and proceeds to explore DSCs within the contexts of cryopreservation; epigenetics; pulp, periodontal, tooth, bone, and corneal stroma regeneration; neuronal properties, mesenchymal stem cells and biomaterials; and as sources of hepatocytes for liver disease treatment. The fifteen expertly authored chapters comprehensively examine possible applications of DSCs and provide invaluable insights into mechanisms of growth and differentiation. Dental Stem Cells: Regenerative Potential draws from a wealth of international perspectives and is an essential addition to the developing literature on dental stem cells. This installment of Springer’s Stem Cell Biology and Regenerative Medicine series is indispensable for biomedical researchers interested in bioengineering, dentistry, tissue engineering, regenerative medicine, cell biology and oncology.
Book Synopsis Dental and Periodontal Tissues Formation and Regeneration: Current Approaches and Future Challenges by : Giovanna Orsini
Download or read book Dental and Periodontal Tissues Formation and Regeneration: Current Approaches and Future Challenges written by Giovanna Orsini and published by Frontiers Media SA. This book was released on 2016-10-07 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sequential and reciprocal interactions between oral epithelial and cranial neural crest-derived mesenchymal cells give rise to the teeth and periodontium. Teeth are vital organs containing a rich number of blood vessels and nerve fibers within the dental pulp and periodontium. Teeth are composed by unique and specific collagenous (dentin, fibrillar cementum) and non-collagenous (enamel) highly mineralized extracellular matrices. Alveolar bone is another collagenous hard tissue that supports tooth stability and function through its close interaction with the periodontal ligament. Dental hard tissues are often damaged after infection or traumatic injuries that lead to the partial or complete destruction of the functional dental and supportive tissues. Well-established protocols are routinely used in dental clinics for the restoration or replacement of the damaged tooth and alveolar bone areas. Recent progress in the fields of cell biology, tissue engineering, and nanotechnology offers promising opportunities to repair damaged or missing dental tissues. Indeed, pulp and periodontal tissue regeneration is progressing rapidly with the application of stem cells, biodegradable scaffolds, and growth factors. Furthermore, methods that enable partial dental hard tissue repair and regeneration are being evaluated with variable degrees of success. However, these cell-based therapies are still incipient and many issues need to be addressed before any clinical application. The understanding of tooth and periodontal tissues formation would be beneficial for improving regenerative attempts in dental clinics. In the present e-book we have covered the various aspects dealing with dental and periodontal tissues physiology and regeneration in 6 chapters: 1. General principles on the use of stem cells for regenerating craniofacial and dental tissues 2. The roles of nerves, vessels and stem cell niches in tissue regeneration 3. Dental pulp regeneration and mechanisms of various odontoblast functions 4. Dental root and periodontal physiology, pathology and regeneration 5. Physiology and regeneration of the bone using various scaffolds and stem cell populations 6. Physiology, pathology and regeneration of enamel using dental epithelial stem cells
Book Synopsis LAB-CENTRED APPROACH FOR INITI by : Manasi Bhoj
Download or read book LAB-CENTRED APPROACH FOR INITI written by Manasi Bhoj and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "A Lab-centred Approach for Initiating Early Stage Regeneration of Dental Pulp Using Specialised Alginate Biomimetic Microenvironments" by Manasi, Bhoj, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: A living, self-supporting pulp tissue replacement for patients remains a considerable bioengineering challenge. As yet there is no method for engineering a self-sustaining living pulp tissue that can be successfully transplanted into the patient and have any beneficial clinical outcomes. The main reason for this failure is the inability to reconstitute a functional blood vessel tubular network within the engineered pulp tissue. In addition, it has yet not been possible to engineer the various anatomically distinct structures and architectures of the healthy pulp tissue. The idea is that a bio-engineered pulp-like structure prior to transplantation will accelerate integration and reduce the potential for complications. Recently new strides are being taken to make a functioning living pulp tissue using the latest step by step enhancements that are occurring in biomimetic molecular engineering. The use of this basic tissue engineering processes of living organic matter in fabrication is ensuring that prospective lab-made tissue products are biologically compatible. Systems built into biomaterials involving self-assembly, feedback mechanisms will lead to realistic tissue replicates. The new methods include, fabricating biomimetic tissue frameworks with an array of keystone biochemical cues and structural cues. Alternatively others are suggesting that it is feasible to stimulate natural repair using small molecules and temporary frameworks together or independently. A typical tissue engineering strategy that also promises to work is to combine mixed cell populations and growth factors in a scaffold microenvironment. The hypothesis is that recreating an early stage tissue microenvironment-one that resembles the postnatal constitution that will initiate the autonomous reconstruction of native pulp tissue in vitro. As a result, a coherent self-sustaining and self-supporting tissue construct is prepared for rapid integration and remodeling. Our purpose, in this study is to create the formative elements for pulp tissue that go on to develop and regenerate into a functional living pulp tissue. The objective were firstly, to combine dental mesenchymal stem cells and human umbilical vein endothelial cells with limited key growth factors within a space filling the aalginate hydrogel. Secondly, to test the capacity of these encapsulated stem cells for proliferationon, and lastly, measure the capture level for soluble bio-chemicals and test the capacity of the system to release growth factors in a slow, continuous fashion. These are critical performance issues for building pulp de novo. There are more to be tackled in later stages of developing this technology. An alginate-RGD conjugated gel was used to encapsulate adult dental pulp mesenchymal stem cells and human umbilical vein endothelial cells (HUVEC) in the ratio of 1:1. It also served as a means for the targeted delivery of two key growth factors 〖VEGF〗 DEGREES121 (Vascular endothelial growth factor) and FGF-2 (Fibroblastic growth factor) towards the population of cells. In the experiments we varied the combinations of these four components and results with SEM and confocal microscopy show uniform cell distribution and viable cells in all test and control groups. There were significant differences between the groups with no growth factors and groups in which growth factors were added. Interestingly, c
Book Synopsis Dental Pulp Stem Cells by : Sibel Yildirim
Download or read book Dental Pulp Stem Cells written by Sibel Yildirim and published by Springer Science & Business Media. This book was released on 2012-10-15 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stem cell technology is moving forward at a tremendous rate. Recent discoveries have surprised even the most expert researchers. While every piece of new data broadens the current knowledge and contributes to this moving forward, the new data also serve as paradigm shifters of fundamental knowledge of cell biology. While the question ‘What is a Stem Cell’ may now seem to basic to even discuss, there are still some discrepancies, however, between groups in terms of their functional roles. Teeth develop from the ectoderm of the first branchial arch and the ectomesenchyme of the neural crest. Deciduous teeth start to form between the sixth and eighth weeks, and permanent teeth begin to form in the twentieth weeks. Several studies have demonstrated that the pulp from both adult teeth and deciduous teeth contains dental pulp stem cells. Several factors have made them very attractive as a model system for many researchers; they are multipotent, ethically and non-controversially available in large numbers, immuno-compatible, developmentally primitive, easy to isolate and have high expansion potential in vitro. However, many controversies still exist in the field. There are several unanswered questions in the biology of dental pulp and odontoblasts. This new volume in the SpringerBriefs in Stem Cells series presents an evaluation of stem cells from human dental pulp as a reliable stem cell source for cell-based therapy to stimulate tissue regeneration.
Book Synopsis Dentin/Pulp Complex by : Tatsuya Ishikawa
Download or read book Dentin/Pulp Complex written by Tatsuya Ishikawa and published by Quintessence Publishing (IL). This book was released on 2002 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Cell Cycle in the Central Nervous System by : Damir Janigro
Download or read book The Cell Cycle in the Central Nervous System written by Damir Janigro and published by Springer Science & Business Media. This book was released on 2008-01-23 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cell Cycle in the Central Nervous System overviews the changes in cell cycle as they relate to prenatal and post natal brain development, progression to neurological disease or tumor formation.Topics covered range from the cell cycle during the prenatal development of the mammalian central nervous system to future directions in postnatal neurogenesis through gene transfer, electrical stimulation, and stem cell introduction. Additional chapters examine the postnatal development of neurons and glia, the regulation of cell cycle in glia, and how that regulation may fail in pretumor conditions or following a nonneoplastic CNS response to injury. Highlights include treatments of the effects of deep brain stimulation on brain development and repair; the connection between the electrophysiological properties of neuroglia, cell cycle, and tumor progression; and the varied immunological responses and their regulation by cell cycle.
Book Synopsis Regenerative Dentistry by : Mona Marei
Download or read book Regenerative Dentistry written by Mona Marei and published by Springer Nature. This book was released on 2022-06-01 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dental caries, periodontitis, tooth loss, and bone resorption are considered prevalent health problems that have direct affect on the quality of life. While, advances in stem cell biology and biotechnology have sparked hope for devastating maladies, such as diabetes, cardiovascular diseases, etc., it also provides a strategy of regenerative therapy for dental tissues. From the prospective of tissue engineering, it is of utmost importance to understand and emulate the complex cell interactions that make up a tissue or organ. Unlike other tissues in the body, dental tissues are unique in their development, function, and even in their maintenance throughout life. The harmonized stimulations of biology and mechanical regulators to promote cellular activities have matured our understanding of the value of regenerative therapy of dental tissue versus the reparative treatment. In this book, we review the current knowledge available to regenerate alveolar bone, periodontal structure, and pulp/dentin complex. The book provides researchers with detailed information about development and functional characteristics of the dental unit with detailed protocols covering a comprehensive range of various approaches to engineer dental tissues: to use isolated cells or cell substitutes as cellular replacement, to use acellular biomaterials capable of inducing tissue regeneration, and/or to use a combination of cells, biomaterial and growth factors. We are well aware, with the concept changes in the field toward in-vitro biomimetics of in-vivo tissue development. The theoretical frame work integrating these concepts of developmental biology and developmental engineering is yet to be emphasized and implemented. Until this happens, we consider this book of regenerative dentistry as a call for scientists to achieve, researchers to innovate, practitioners to apply, and students to learn the art and science of regenerative therapy in dentistry. Table of Contents: Introduction to Regenerative Dentistry / Tissue Engineering Alveolar Bone / Tissue Engineering of the Periodontal Tissues / Dynamics for Pulp-Dentin Tissue Engineering in Operative Dentistry
Book Synopsis Manipulating Endothelial Progenitor Cell Homing with Sphingosine-1-phosphate for Therapeutic Angiogenesis by : Priscilla Anne Williams
Download or read book Manipulating Endothelial Progenitor Cell Homing with Sphingosine-1-phosphate for Therapeutic Angiogenesis written by Priscilla Anne Williams and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ischemic vascular diseases are the main cause of mortality worldwide and yet current therapies only delay disease progression and improve quality of life without addressing the fundamental problem of tissue loss. Within the field of tissue engineering, therapeutic angiogenesis provides a promising approach to alternatively provide new blood vessel formation via spatiotemporally controlled delivery of proangiogenic agents. Sphingosine-1-phosphate (S1P), a bioactive lysophospholipid that is upregulated under ischemic conditions, has recently gained great enthusiasm as a potential mediator in neovascularization strategies given its essential roles in promoting both neovessel formation and stabilization, and cellular trafficking along highly regulated endogenous gradients. Herein, the governing hypothesis guiding this dissertation is that local biomaterial-controlled delivery of S1P may be used to enhance migration and recruitment of vascular progenitor cells for enhanced therapeutic angiogenesis within ischemic tissue. The initial work in this dissertation investigated the effect of hypoxia on the angiogenic response of both mature and progenitor endothelial cells to S1P stimulation in vitro. Outgrowth endothelial cells (OECs) were isolated from human umbilical cord blood to provide a clinically relevant source of vascular progenitor cells for the studies conducted within this dissertation. S1P stimulation promoted angiogenic activity of both ECs and OECs under both ambient and hypoxic (1%) oxygen tensions. Furthermore, dual therapy with the combination of S1P and vascular endothelial growth factor (VEGF) further enhanced cellular responses. Interestingly, hypoxia substantially augmented the functional response of OECs to S1P, resulting in ~25-fold and ~6.5-fold increases in directed migration and sprouting, respectively. Thus, these studies highlighted the potential for S1P as a therapeutic agent for treatment of ischemic diseases. An injectable biomaterial system capable of establishing sustained gradients of S1P with minimally invasive delivery was thus developed. Herein, hydrogels were designed with varying composition and mechanical properties to provide varied rates of S1P release. Hybrid hydrogels composed of both alginate and chitosan polymers were shown to provide control over lipid release by altering the chitosan content. Thus, this work presents a platform for alginate-chitosan hydrogels of controlled composition and in situ gelation properties that can be used to control lipid release for therapeutic applications. Release of S1P from alginate-chitosan hydrogels was investigated in terms of the ability to stimulate OEC angiogenic sprouting and directed migration to probe the effect of different S1P presentation profiles on cellular response. Herein, slower regimens were shown to establish gradients favorable for enhancing both the functional response of OECs and the development of new blood vessels in a chick chorioallantoic (CAM) assay in vivo. Furthermore, S1P delivered from an alginate-chitosan hydrogel (via intramuscular injection) was shown to enhance short-term regional blood perfusion as compared to both bolus delivery of S1P and the blank control (no S1P). In subsequent studies to test recruitment of human OECs, cells were seeded within scaffolds and transplanted within the same limb as the injected material. While OECs were observed to outwardly migrate from the scaffolds and invade the ischemic muscle tissue, no differences were observed between the three treatment groups at the investigated time point (48 hours). Overall, this work provides important insights into S1P signaling and delivery for tissue engineering strategies involving therapeutic angiogenesis.
Book Synopsis EphrinB2/EphB4 Signaling Regulates Angiogenesis of Dental Pulp Stem Cells and Endothelial Cells by : 龚婷
Download or read book EphrinB2/EphB4 Signaling Regulates Angiogenesis of Dental Pulp Stem Cells and Endothelial Cells written by 龚婷 and published by . This book was released on 2019 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vascular Endothelial Growth Factor Expression in the Murine Dental Pulp During Aging and Dentin Regeneration by : Sara N. Parent
Download or read book Vascular Endothelial Growth Factor Expression in the Murine Dental Pulp During Aging and Dentin Regeneration written by Sara N. Parent and published by . This book was released on 2014 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vascular endothelial growth factor (VEGF) is an important pro-angiogenic growth factor that is essential for maintenance of vascular networks throughout the body, including those in the dental pulp. In addition, it has been suggested that VEGF may play a role in dentin regeneration and mineralization. As well studied as VEGF is, currently there are no studies looking at the effects of aging on VEGF expression in the dental pulp. We proposed a study of the expression levels of VEGF in the dental pulp during aging using a mouse model to test whether VEGF expression decreases with age and whether this decrease causes a decrease in pulpal vascular density and tertiary dentin formation. Tertiary dentin is formed as an internal reparative response to injury to the tooth, which can involve stem cell recruitment from the dental pulp. However, better understanding of this process is needed to develop stem cell and tissue regeneration applications to improve the organization and formation of tertiary dentin following injury. Mandibles from mice in six separate age groups were collected and histological analysis was performed. Mandibular molar sections were stained for antibodies for VEGFR-2, VEGFR-3, VEGF-A, VEGF-C, LYVE-1 (a lymphatic marker) and BS-1 (a vascular marker). Mandibular molars were also isolated from three separate age groups and collected for gene expression analysis using Q-RT-PCR. The immunofluorescence results from the vascularity study showed a significant decrease in blood vessel density with the highest levels found in the neonate and the lowest found in the most aged samples. There was also a distinct qualitative difference in the expression of VEGF-A in the dental pulp and odontoblast layers of samples from each age group that followed the same trend as the vasculature. Lymphatics were not detected in any of the age groups. Q-RT-PCR results showed that there was a decrease in gene expression in vWF (a blood vessel marker), VE-cadherin (a blood vessel marker), VEGFR-3, VEGF-A and VEGF-C from the neonatal to senescent age groups. VEGFR-1 and -2 were only detected at low levels in the neonatal age group. Surprisingly VEGF-C and VEGFR-3 were highly expressed in the dental pulp and although their expressions also decrease with aging, they were the only VEGF ligand and receptor detectable in the uninjured adult mouse molar. For the second part of the study, to determine if VEGF played a role in dentin regeneration, the first maxillary molars of nine mice were drilled to induce a wound healing response in the tooth. They were allowed time to heal and then the maxillae were collected and stained with 3,3'-diaminobenzidine for VEGF-A and VEGFR-2 expression at three time points post-injury. The histological sections from injured molars showed a dramatic increase in VEGF-A expression fifteen minutes after injury that dissipated with time and returned to near normal levels after four weeks post-injury. VEGFR-2 expression was also elevated soon after injury and then gradually returned to pre-injury levels. Current findings of this study suggest that although the expression of VEGF-A and its receptor VEGFR-2, which has been traditionally viewed as the most potent pro- angiogenic signaling pathway, does decrease with age, this ligand and receptor may play a more important role in regulating the response to tooth injury and dental regeneration. In contrast, VEGFR-3 and its ligand VEGF-C, which have traditionally been associated with only lymphangiogenesis, may be contributing to the regulation of angiogenesis in the dental pulp.
Book Synopsis Vascular Growth Factors and Angiogenesis by : Lena Claesson-Welsh
Download or read book Vascular Growth Factors and Angiogenesis written by Lena Claesson-Welsh and published by . This book was released on 1998-11-19 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focusses on a family of growth factors and their receptors, known as vascular endothelial growth factors (VEGF's). VEGF's are critical for endothelial cell function, both during physiological and pathological conditions. Thus, tumors depend on VEGF in order to promote ingrowth of blood vessels. Without VEGF, blood vessels will not form. There is growing awareness that deregulated production or action of VEGF is initiating or driving a large number of diseases. The book is written by the leading scientists in the field for an audience with medical or life science background, and presents an overview of the current knowledge in the area of VEGF and VEDG receptor structure and function in a series of reviews spanning from molecular signal transduction and cellular biology to the clinic.
Book Synopsis Endothelial Cell Culture by : Roy Bicknell
Download or read book Endothelial Cell Culture written by Roy Bicknell and published by Cambridge University Press. This book was released on 1996-09-28 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the Handbooks in Practical Animal Cell Biology is to provide practical workbooks for those involved in primary cell culture. Each volume addresses a different cell lineage, and contains an introductory section followed by individual chapters on the culture of specific differentiated cell types. The authors of each chapter are leading researchers in their fields and use their first-hand experience to present reliable techniques in a clear and thorough manner. Endothelial Cell Culture contains chapters on endothelial cells derived from 1) lung, 2) bone marrow, 3) brain, 4) mammary glands, 5) skin, 6) adipose tissue, 7) female reproductive system, and 8) synovium.
Book Synopsis Organ Tissue Engineering by : Daniel Eberli
Download or read book Organ Tissue Engineering written by Daniel Eberli and published by Springer. This book was released on 2021-04-22 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The notion of being able to engineer complete organs has inspired an entire generation of researchers. While recent years have brought significant progress in regenerative medicine and tissue engineering, the immense challenges encountered when trying to engineer an entire organ have to be acknowledged. Despite a good understanding of cell phenotypes, cellular niches and cell-to-biomaterial interactions, the formation of tissues composed of multiple cells remains highly challenging. Only a step-by-step approach will allow the future production of a living tissue construct ready for implantation and to augment organ function. In this book, expert authors present the current state of this approach. It offers a concise overview and serves as a great starting point for anyone interested in the application of tissue engineering or regenerative medicine for organ engineering. Each chapter contains a short overview including physiological and pathological changes as well as the current clinical need. The potential cell sources and suitable biomaterials for each organ type are discussed and possibilities to produce organ-like structures are illustrated. The ultimate goal is for the generated small tissues to unfold their full potential in vivo and to serve as a native tissue equivalent. By integrating and evolving, these implants will form functional tissue in-vivo. This book discusses the desired outcome by focusing on well-defined functional readouts. Each chapter addresses the status of clinical translations and closes with the discussion of current bottlenecks and an outlook for the coming years. A successful regenerative medicine approach could solve organ shortage by providing biological substitutes for clinical use - clearly, this merits a collaborative effort.
