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Composite tissue transplantation

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https://www.readbyqxmd.com/read/27879599/total-human-eye-allotransplantation-developing-surgical-protocols-for-donor-and-recipient-procedures
#1
Edward H Davidson, Eric W Wang, Jenny Y Yu, Juan C Fernandez-Miranda, Dawn J Wang, Nikisha Richards, Maxine Miller, Joel S Schuman, Kia M Washington
BACKGROUND: Vascularized composite allotransplantation of the eye is an appealing, novel method for reconstruction of the nonfunctioning eye. The authors' group has established the first orthotopic model for eye transplantation in the rat. With advancements in immunomodulation strategies together with new therapies in neuroregeneration, parallel development of human surgical protocols is vital for ensuring momentum toward eye transplantation in actual patients. METHODS: Cadaveric donor tissue harvest (n = 8) was performed with orbital exenteration, combined open craniotomy, and endonasal approach to ligate the ophthalmic artery with a cuff of paraclival internal carotid artery, for transection of the optic nerve at the optic chiasm and transection of cranial nerves III to VI and the superior ophthalmic vein at the cavernous sinus...
December 2016: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/27873528/transplantation-of-vascularized-composite-allografts-review-of-current-knowledge
#2
M Molitor
Transplantation in reconstructive surgery has been performed for more than 20 years, although the official beginning of these procedures is considered the first successful transplantation of the hand in 1998. The original name "Composite Tissue Transplantation" has been used less frequently; more common is the term "Vascularized Composite Allotransplant", which better describes the basis of the procedure. There have been so far approximately 180 transplantations performed, the exact number is difficult to find...
2016: Acta Chirurgiae Plasticae
https://www.readbyqxmd.com/read/27859633/visceral-fat-is-strongly-associated-with-post-transplant-diabetes-mellitus-and-glucose-metabolism-one-year-after-kidney-transplantation
#3
Marit Elizabeth von Düring, Trond Jenssen, Jens Bollerslev, Anders Åsberg, Kristin Godang, Anders Hartmann
Body composition after kidney transplantation is linked to glucose metabolism, and impaired glucose metabolism is associated with increased risk of cardiovascular events and death. One year after transplantation we examined 150 patients for new-onset diabetes performing OGTTs and body composition measurements including visceral adipose tissue (VAT) content from dual-energy X-ray absorptiometry scans. We found that glucose metabolism was generally improved and that the levels of VAT and percentage VAT of total body fat mass (VAT%totBFM ) were lowest in those with normal glucose tolerance and highest in those with post transplant diabetes mellitus...
November 16, 2016: Clinical Transplantation
https://www.readbyqxmd.com/read/27824874/effect-of-transplanting-various-concentrations-of-a-composite-of-human-umbilical-cord-blood-derived-mesenchymal-stem-cells-and-hyaluronic-acid-hydrogel-on-articular-cartilage-repair-in-a-rabbit-model
#4
Yong-Beom Park, Chul-Won Ha, Jin-A Kim, Ji-Heon Rhim, Yong-Geun Park, Jun Young Chung, Han-Jun Lee
BACKGROUND: Mesenchymal stem cells (MSCs) are known to have therapeutic potential for cartilage repair. However, the optimal concentration of MSCs for cartilage repair remains unclear. Therefore, we aimed to explore the feasibility of cartilage repair by human umbilical cord blood-derived MSCs (hUCB-MSCs) and to determine the optimal concentrations of the MSCs in a rabbit model. METHODS: Osteochondral defects were created in the trochlear groove of femur in 55 rabbits...
2016: PloS One
https://www.readbyqxmd.com/read/27789339/single-stage-cell-based-cartilage-repair-in-a-rabbit-model-cell-tracking-and-in-vivo-chondrogenesis-of-human-umbilical-cord-blood-derived-mesenchymal-stem-cells-and-hyaluronic-acid-hydrogel-composite
#5
Y B Park, C W Ha, J A Kim, W J Han, J H Rhim, H J Lee, K J Kim, Y G Park, J Y Chung
OBJECTIVE: Human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) have gained popularity as a promising cell source for regenerative medicine, but limited in vivo studies have reported cartilage repair. In addition, the roles of MSCs in cartilage repair are not well-understood. The purpose of this study was to investigate the feasibility of transplanting hUCB-MSCs and hyaluronic acid (HA) hydrogel composite to repair articular cartilage defects in a rabbit model and determine whether the transplanted cells persisted or disappeared from the defect site...
October 24, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27757352/fu-chan-wei-surgeon-innovator-and-leader-of-the-legendary-chang-gung-microsurgery-center
#6
Nidal Farhan Al Deek, Donald H Lalonde
Fu-Chan Wei is a world-renowned plastic and reconstructive surgeon. He is clearly one of the most influential and innovative surgeons in the history of plastic surgery. The Taiwanese legend is the innovator of the osteoseptocutaneous fibula flap, which revolutionized the reconstruction of composite bone and soft tissue defects in the jaw and extremities. He has pioneered several perforator flaps, including the free style variety. He has taken toe-to-hand microsurgical transplantation to a whole new level. He is not only recognized for his surgical skills and clinical innovations, but also for his vision, leadership, and teaching...
September 2016: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/27755395/an-anatomical-murine-model-of-heterotopic-periorbital-subunit-transplantation
#7
Bowen Gao, Qingxiong Yu, Feng Xie, Lingling Sheng, Xiyuan Mao, Qingfeng Li, Hainan Zhu
BACKGROUND: Conventional reconstructive methods fail to achieve satisfactory results in total eyelid defect cases. Vascularized composite tissue allotransplantation might provide both good appearance and function for these patients. The structure of the eyelid is exceptional because it simultaneously consists of skin, connective tissue, the striated muscle, fiber structure, aponeuroses, and mucosa. Thus, before clinical application of eyelid allotransplantation, more experiments are needed to clarify the impact of ischemia, immunal suppressive agents, and deinnervation effects on these sophisticated structures...
October 13, 2016: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/27740465/perioperative-management-of-a-bilateral-forearm-allograft
#8
M Clerc, J Prothet, T Rimmelé
Composite tissue allotransplantation (CTA) is a complex procedure requiring a multidisciplinary collaboration between surgeons, anesthetists, and transplantation specialists. We will describe the perioperative management of a bilateral forearm allograft performed at our facility. A 40-year-old man who lost both forearms was registered on the transplant waiting list; a suitable graft was available 11months later. Anesthesia required planning for vascular access, hemodynamic monitoring, fluid therapy management and prevention of deep vein thrombosis...
June 2016: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/27733094/cell-co-transplantation-strategies-for-vascularized-craniofacial-bone-tissue-engineering-a-systematic-review-and-meta-analysis-of-pre-clinical-in-vivo-studies
#9
Siddharth Shanbhag, Kamal Mustafa, Nikolaos Pandis, Jens R Nyengaard, Andreas Stavropoulos
The regenerative potential of tissue engineered bone constructs may be enhanced by in vitro co-culture and in vivo co-transplantation of vasculogenic and osteogenic (progenitor) cells. The objective of this study was to systematically review the literature to answer the focused question: in animal models, does co-transplantation of osteogenic and vasculogenic cells enhance bone regeneration in craniofacial defects, compared to solely osteogenic cell-seeded constructs? Following PRISMA guidelines, electronic databases were searched for controlled animal studies reporting co-transplantation of endothelial cells (EC) with mesenchymal stem cells (MSC) or osteoblasts (OB) in craniofacial critical-size bone defect (CSD) models...
October 12, 2016: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/27729548/systemic-delivery-of-bone-marrow-mesenchymal-stem-cells-for-in-situ-intervertebral-disc-regeneration
#10
Carla Cunha, Catarina R Almeida, Maria Inês Almeida, Andreia M Silva, Maria Molinos, Sofia Lamas, Catarina L Pereira, Graciosa Q Teixeira, António T Monteiro, Susana G Santos, Raquel M Gonçalves, Mário A Barbosa
: : Cell therapies for intervertebral disc (IVD) regeneration presently rely on transplantation of IVD cells or stem cells directly to the lesion site. Still, the harsh IVD environment, with low irrigation and high mechanical stress, challenges cell administration and survival. In this study, we addressed systemic transplantation of allogeneic bone marrow mesenchymal stem cells (MSCs) intravenously into a rat IVD lesion model, exploring tissue regeneration via cell signaling to the lesion site...
October 11, 2016: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/27726743/mr-imaging-of-pediatric-bone-marrow
#11
Brian Y Chan, Kara G Gill, Susan L Rebsamen, Jie C Nguyen
The bone marrow is one of the largest organs in the body and is visible in every magnetic resonance (MR) imaging study. It is composed of a combination of hematopoietic red marrow and fatty yellow marrow, and its composition changes throughout life in response to normal maturation (red to yellow conversion) and stress (yellow to red reconversion). MR imaging is highly sensitive for detection of altered marrow signal intensity, and the T1-weighted spin-echo sequence provides the most robust contrast between yellow marrow and disease...
October 2016: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/27723276/engineered-basement-membranes-for-regenerating-the-corneal-endothelium
#12
Rachelle N Palchesko, James L Funderburgh, Adam W Feinberg
Basement membranes are protein-rich extracellular matrices (ECM) that are essential for epithelial and endothelial tissue structure and function. Aging and disease cause changes in the physical properties and ECM composition of basement membranes, which has spurred research to develop methods to repair and/or regenerate these tissues. An area of critical clinical need is the cornea, where failure of the endothelium leads to stromal edema and vision loss. Here, an engineered basement membrane (EBM) is developed that consists of a dense layer of collagen IV and/or laminin ≈5-10 nm thick, created using surface-initiated assembly, conformally attached to a collagen I film...
October 10, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27722242/periosteum-tissue-engineering-a-review
#13
Nanying Li, Juqing Song, Guanglin Zhu, Xiaoyu Li, Lei Liu, Xuetao Shi, Yingjun Wang
As always, the clinical therapy of critical size bone defects caused by trauma, tumor removal surgery or congenital malformation is facing great challenges. Currently, various approaches including autograft, allograft and cell-biomaterial composite based tissue-engineering strategies have been implemented to reconstruct injured bone. However, due to damage during the transplantation processes or design negligence of the bionic scaffolds, these methods expose vulnerabilities without the assistance of periosteum, a bilayer membrane on the outer surface of the bone...
October 18, 2016: Biomaterials Science
https://www.readbyqxmd.com/read/27717133/the-fractionation-of-adipose-tissue-procedure-to-obtain-stromal-vascular-fractions-for-regenerative-purposes
#14
Joris A van Dongen, Hieronymus P Stevens, Mojtaba Parvizi, Berend van der Lei, Martin C Harmsen
Autologous adipose tissue transplantation is clinically used to reduce dermal scarring and to restore volume loss. The therapeutic benefit on tissue damage more likely depends on the stromal vascular fraction of adipose tissue than on the adipocyte fraction. This stromal vascular fraction can be obtained by dissociation of adipose tissue, either enzymatically or mechanical. Enzymatic dissociation procedures are time-consuming and expensive. Therefore, we developed a new inexpensive mechanical dissociation procedure to obtain the stromal vascular fraction from adipose tissue in a time sparing way, which is directly available for therapeutic injection...
September 26, 2016: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/27706825/mesenchymal-stem-cells-in-tendon-repair-and-regeneration-basic-understanding-and-translational-challenges
#15
Daniel J Leong, Hui B Sun
Tendon injuries are common and present a clinical challenge because they often respond poorly to treatment and require prolonged rehabilitation. Current treatments often do not completely repair or regenerate the injured or diseased tendon to its native composition, structure, and mechanical properties. Stem cell-based therapies have brought new hope for tissue repair and regeneration, including that for tendon rupture and tendinopathy. Despite tremendous effort and progress, the success of stem cell-based studies on tendon repair and regeneration has mainly been limited to preclinical studies with few clinical applications...
November 2016: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/27693154/tracking-the-route-of-phenanthrene-uptake-in-mosses-an-experimental-trial
#16
V Spagnuolo, F Figlioli, F De Nicola, F Capozzi, S Giordano
In recent decades, mosses have been used as native species or as transplants in monitoring a wide range of pollutants from inorganic (i.e. metals and metalloids) to organic contaminants (mainly polycyclic aromatic hydrocarbons-PAHs). To implement the use of mosses as biomonitors of PAHs, one important issue is the study of the interactions between these compounds and moss tissues. In this study we investigated the mode of phenanthrene uptake in four moss species (Amblystegium humile, Plagiomnium affine, Hypnum cupressiforme and a clone of Sphagnum palustre) and its movements from air to plant surface and within the biomonitors, using fluorescent and confocal microscopy...
September 29, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27685855/tumor-infiltrating-macrophages-in-post-transplant-relapsed-classical-hodgkin-lymphoma-are-donor-derived
#17
Genevieve M Crane, Mark A Samols, Laura A Morsberger, Raluca Yonescu, Michele L Thiess, Denise A S Batista, Yi Ning, Kathleen H Burns, Milena Vuica-Ross, Michael J Borowitz, Christopher D Gocke, Richard F Ambinder, Amy S Duffield
Tumor-associated inflammatory cells in classical Hodgkin lymphoma (CHL) typically outnumber the neoplastic Hodgkin/Reed-Sternberg (H/RS) cells. The composition of the inflammatory infiltrate, particularly the fraction of macrophages, has been associated with clinical behavior. Emerging work from animal models demonstrates that most tissue macrophages are maintained by a process of self-renewal under physiologic circumstances and certain inflammatory states, but the contribution from circulating monocytes may be increased in some disease states...
2016: PloS One
https://www.readbyqxmd.com/read/27668213/the-quest-for-anti-inflammatory-and-anti-infective-biomaterials-in-clinical-translation
#18
REVIEW
May Griffith, Mohammad M Islam, Joel Edin, Georgia Papapavlou, Oleksiy Buznyk, Hirak K Patra
Biomaterials are now being used or evaluated clinically as implants to supplement the severe shortage of available human donor organs. To date, however, such implants have mainly been developed as scaffolds to promote the regeneration of failing organs due to old age or congenital malformations. In the real world, however, infection or immunological issues often compromise patients. For example, bacterial and viral infections can result in uncontrolled immunopathological damage and lead to organ failure. Hence, there is a need for biomaterials and implants that not only promote regeneration but also address issues that are specific to compromised patients, such as infection and inflammation...
2016: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/27668147/injectable-hydrogels-for-cardiac-tissue-repair-after-myocardial-infarction
#19
Anwarul Hasan, Ahmad Khattab, Mohammad Ariful Islam, Khaled Abou Hweij, Joya Zeitouny, Renae Waters, Malek Sayegh, Md Monowar Hossain, Arghya Paul
Cardiac tissue damage due to myocardial infarction (MI) is one of the leading causes of mortality worldwide. The available treatments of MI include pharmaceutical therapy, medical device implants, and organ transplants, all of which have severe limitations including high invasiveness, scarcity of donor organs, thrombosis or stenosis of devices, immune rejection, and prolonged hospitalization time. Injectable hydrogels have emerged as a promising solution for in situ cardiac tissue repair in infarcted hearts after MI...
November 2015: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/27651796/phenotypic-functional-and-safety-control-at-preimplantation-phase-of-msc-based-therapy
#20
Wioletta Lech, Anna Figiel-Dabrowska, Anna Sarnowska, Katarzyna Drela, Patrycja Obtulowicz, Bartlomiej Henryk Noszczyk, Leonora Buzanska, Krystyna Domanska-Janik
Mesenchymal stem cells (MSC) exhibit enormous heterogeneity which can modify their regenerative properties and therefore influence therapeutic effectiveness as well as safety of these cells transplantation. In addition the high phenotypic plasticity of MSC population makes it enormously sensitive to any changes in environmental properties including fluctuation in oxygen concentration. We have shown here that lowering oxygen level far below air atmosphere has a beneficial impact on various parameters characteristic for umbilical cord Wharton Jelly- (WJ-) MSC and adipose tissue- (AD-) derived MSC cultures...
2016: Stem Cells International
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