Grafting – Basic Principles and Surgical Applications, Part II

2019 ◽  
Author(s):  
Dominic Henn ◽  
Kellen Chen ◽  
Janos A. Barrera ◽  
Jagannath Padmanabhan ◽  
Sun Hyung Kwon ◽  
...  
Keyword(s):  
Graft Survival ◽  
Bone Grafting ◽  
Critical Role ◽  
Tumor Resection ◽  
Surgical Techniques ◽  
New Bone Formation ◽  
Self Renewal ◽  
Basic Principles ◽  
Cartilage Grafting ◽  
Autologous Grafts

Grafting of blood vessels and nerves are essential surgical techniques which are used to restore continuity in cases of acute or chronic vascular or nervous damage. Due to superior outcomes autologous grafts are generally preferred over allografts or alloplastic grafts. Bone, cartilage and tendons are physiologically subjected to various degrees of mechanical stress, which has been observed to play a critical role in graft survival and remodeling. Bone grafting is used to replace missing bone or to enhance new bone formation in the treatment of fractures, delayed or non-unions or in reconstructive surgery after trauma or tumor resection. Unlike bone, cartilage and tendons have a low capacity for self-renewal due their avascular nature and low cellularity which presents challenges to graft survival and healing rates. This review contains 2 figures, and 68 references.  Keywords: autograft, allograft, vascular grafting, nerve grafting, bone grafting, cartilage grafting, tendon grafting, tissue engineering, regenerative medicine

Metabolic Regulation and Related Molecular Mechanisms in Various Stem Cell Functions

2020 ◽  
Vol 15 (6) ◽  
pp. 531-546 ◽  
Author(s):  
Hwa-Yong Lee ◽  
In-Sun Hong
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Oxidative Phosphorylation ◽  
Metabolic Pathways ◽  
Critical Role ◽  
The Self ◽  
Specific Cell ◽  
Differentiation Potential ◽  
Self Renewal ◽  
Cell Functions

Recent studies on the mechanisms that link metabolic changes with stem cell fate have deepened our understanding of how specific metabolic pathways can regulate various stem cell functions during the development of an organism. Although it was originally thought to be merely a consequence of the specific cell state, metabolism is currently known to play a critical role in regulating the self-renewal capacity, differentiation potential, and quiescence of stem cells. Many studies in recent years have revealed that metabolic pathways regulate various stem cell behaviors (e.g., selfrenewal, migration, and differentiation) by modulating energy production through glycolysis or oxidative phosphorylation and by regulating the generation of metabolites, which can modulate multiple signaling pathways. Therefore, a more comprehensive understanding of stem cell metabolism could allow us to establish optimal culture conditions and differentiation methods that would increase stem cell expansion and function for cell-based therapies. However, little is known about how metabolic pathways regulate various stem cell functions. In this context, we review the current advances in metabolic research that have revealed functional roles for mitochondrial oxidative phosphorylation, anaerobic glycolysis, and oxidative stress during the self-renewal, differentiation and aging of various adult stem cell types. These approaches could provide novel strategies for the development of metabolic or pharmacological therapies to promote the regenerative potential of stem cells and subsequently promote their therapeutic utility.

Reconstruction of the Mandibular Condyle

2021 ◽  
Author(s):  
Spencer R. Anderson ◽  
Kaitlynne Y. Pak ◽  
Aurora G. Vincent ◽  
Adrian Ong ◽  
Yadranko Ducic
Keyword(s):  
Gold Standard ◽  
Traumatic Injury ◽  
Tumor Resection ◽  
Surgical Techniques ◽  
Mandibular Condyle ◽  
Facial Aesthetics ◽  
Mandibular Growth ◽  
Alloplastic Materials ◽  
Technological Advances ◽  
Integral Structure

AbstractThe mandibular condyle is an integral structure in the temporomandibular joint (TMJ) serving not only as the hinge point for mandibular opening, but also facilitating mandibular growth and contributing to facial aesthetics. Significant compromise of the TMJ can be debilitating functionally, psychologically, and aesthetically. Reconstruction of the mandibular condyle is rarely straightforward. Multiple considerations must be accounted for when preparing for condylar reconstruction such as ensuring eradication of all chronically diseased or infected bone, proving clear oncologic margins following tumor resection, or achieving stability of the surrounding architecture in the setting of a traumatic injury. Today, there is not one single gold-standard reconstructive method or material; ongoing investigation and innovation continue to improve and transform condylar reconstruction. Herein, we review methods of condylar reconstruction focusing on autologous and alloplastic materials, surgical techniques, and recent technological advances.

Variability in the reported surgical techniques and methods for intercalary reconstruction following tumor resection

2021 ◽  
pp. 101610
Author(s):  
Elif Ugur ◽  
Rui Yang ◽  
Nicole Levine ◽  
Jichuan Wang ◽  
Harrison Volaski ◽  
...  
Keyword(s):  
Tumor Resection ◽  
Surgical Techniques

scholarly journals The State of the Art and Prospects for Osteoimmunomodulatory Biomaterials

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1357
Author(s):  
Andreea-Mariana Negrescu ◽  
Anisoara Cimpean
Keyword(s):  
Foreign Bodies ◽  
Structural Characteristics ◽  
Critical Role ◽  
Fibrous Tissue ◽  
Bioactive Molecules ◽  
New Bone Formation ◽  
Recent Developments

The critical role of the immune system in host defense against foreign bodies and pathogens has been long recognized. With the introduction of a new field of research called osteoimmunology, the crosstalk between the immune and bone-forming cells has been studied more thoroughly, leading to the conclusion that the two systems are intimately connected through various cytokines, signaling molecules, transcription factors and receptors. The host immune reaction triggered by biomaterial implantation determines the in vivo fate of the implant, either in new bone formation or in fibrous tissue encapsulation. The traditional biomaterial design consisted in fabricating inert biomaterials capable of stimulating osteogenesis; however, inconsistencies between the in vitro and in vivo results were reported. This led to a shift in the development of biomaterials towards implants with osteoimmunomodulatory properties. By endowing the orthopedic biomaterials with favorable osteoimmunomodulatory properties, a desired immune response can be triggered in order to obtain a proper bone regeneration process. In this context, various approaches, such as the modification of chemical/structural characteristics or the incorporation of bioactive molecules, have been employed in order to modulate the crosstalk with the immune cells. The current review provides an overview of recent developments in such applied strategies.

Critical role of the NOTCH ligand JAG2 in self-renewal of myeloma cells

2012 ◽  
Vol 48 (4) ◽  
pp. 247-253 ◽  
Author(s):  
David Chiron ◽  
Sophie Maïga ◽  
Géraldine Descamps ◽  
Philippe Moreau ◽  
Steven Le Gouill ◽  
...  
Keyword(s):  
Critical Role ◽  
Self Renewal ◽  
Notch Ligand ◽  
Myeloma Cells

Endoscopic Vitreoretinal Surgery; Basic Principles, Indications and New Directions

2021 ◽  
pp. 320-326
Keyword(s):  
Anterior Chamber ◽  
Historical Development ◽  
Surgical Techniques ◽  
Vitreoretinal Surgery ◽  
Basic Principles ◽  
Complementary Method ◽  
New Directions ◽  
Ocular Media ◽  
Media Opacities ◽  
Basic Features

In this review, we aimed to give information about the historical development, basic features, and major indications of microendoscopy in vitreoretinal surgery. Microendoscopy permits vitreoretinal surgery for tissues that are not visible using operating microscopy ophthalmoscopy. Evolving technology may overcome the technical limitations of current endoscopic technology. Endoscopic vitreoretinal surgery is particularly useful when tissue details blurred by ocular media opacities or anterior chamber aberrations in contemporary surgical microscopic ophthalmoscopy. Microendoscopy is a robust platform for vitreoretinal surgery. Ophthalmic microendoscopy as a complementary method to modern vitreoretinal surgical techniques is very useful for safe surgery when an operating a microscope becomes insufficient.

scholarly journals Methods of Cryoprotectant Preservation: Allogeneic Cellular Bone Grafts and Potential Effects

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
W. Blake Martin ◽  
Renaud Sicard ◽  
Shabnam M. Namin ◽  
Timothy Ganey
Keyword(s):  
Bone Grafting ◽  
Bone Cells ◽  
Cell Types ◽  
Osteogenic Potential ◽  
Fusion Procedure ◽  
Long Term Storage ◽  
Local Bone ◽  
Surgical Fusion ◽  
Cellular Bone ◽  
Autologous Grafts

Debridement of the bone surface during a surgical fusion procedure initiates an injury response promoting a healing cascade of molecular mediators released over time. Autologous grafts offer natural scaffolding to fill the bone void and to provide local bone cells. Commercial bone grafting products such as allografts, synthetic bone mineral products, etc., are used to supplement or to replace autologous grafts by supporting osteoinductivity, osteoconductivity, and osteogenesis at the surgical site. To assure osteogenic potential, preservation of allogeneic cells with cryoprotectants has been developed to allow for long-term storage and thus delivery of viable bone cells to the surgical site. Dimethyl sulfoxide (DMSO) is an intracellular cryoprotectant commonly used because it provides good viability of the cells post-thaw. However, there is known cytotoxicity reported for DMSO when cells are stored above cryogenic temperatures. For most cellular bone graft products, the cryoprotectant is incorporated with the cells into the other mineralized bone and demineralized bone components. During thawing, the DMSO may not be sufficiently removed from allograft products compared to its use in a cell suspension where removal by washing and centrifugation is available. Therefore, both the allogeneic cell types in the bone grafting product and the local cell types at the bone grafting site could be affected as cytotoxicity varies by cell type and by DMSO content according to reported studies. Overcoming cytotoxicity may be an additional challenge in the formation of bone at a wound or surgical site. Other extracellular cryoprotectants have been explored as alternatives to DMSO which preserve without entering the cell membrane, thereby providing good cellular viability post-thaw and might abrogate the cytotoxicity concerns.

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