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Amniotic tissue graft

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https://www.readbyqxmd.com/read/29719651/combined-tenonplasty-and-scleral-graft-for-refractory-pseudomonas-scleritis-following-pterygium-removal-with-mitomycin-c-application
#1
Heidar Siatiri, Nima Mirzaee-Rad, Shruti Aggarwal, Ahmad Kheirkhah
Purpose: To report a surgical approach combining scleral patch graft and tenonplasty for successful management of refractory Pseudomonas scleritis following pterygium removal with mitomycin C application. Case Report: A 75-year-old diabetic woman with a history of prior pterygium excision and mitomycin C application developed infectious necrotizing scleritis caused by Pseudomonas aeruginosa . Owing to progression of scleritis despite medical management, the patient underwent surgery...
April 2018: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29707747/comparison-of-human-denuded-amniotic-membrane-and-porcine-small-intestine-submucosa-as-scaffolds-for-limbal-mesenchymal-stem-cells
#2
Liliana I Sous Naasani, Cristiano Rodrigues, Jéssica Gonçalves Azevedo, Aline F Damo Souza, Silvio Buchner, Márcia R Wink
Blinding corneal scarring is usually treated with allogeneic graft tissue. Nevertheless, the global shortage of donors leaves millions of patients in need of therapy. Traditional tissue engineering strategies involves the combination of cells, growth factors, and scaffolds that can supply cellular biological components allowing to restore the tissue function. The mesenchymal stem cells found in the limbal stroma (L-MSCs) have a self-renewal potential for multilineage differentiation. Thus, in this work we compared the potential of human amniotic membrane (hAM) and porcine small intestine submucosa (SIS) as scaffolds for L-MSCs, aiming at potential applications in corneal regeneration...
April 29, 2018: Stem Cell Reviews
https://www.readbyqxmd.com/read/29702971/plasma-rich-in-growth-factors-membrane-as-coadjuvant-treatment-in-the-surgery-of-ocular-surface-disorders
#3
Ronald M Sanchez-Avila, Jesús Merayo-Lloves, Ana C Riestra, Silvia Berisa, Carlos Lisa, José Alfonso Sánchez, Francisco Muruzabal, Gorka Orive, Eduardo Anitua
To evaluate the safety and efficacy of the surgical use of plasma rich in growth factors fibrin membrane (mPRGF) in different ocular surface pathologies.Fifteen patients with different corneal and conjunctival diseases were included in the study. Patients were grouped according to the use of mPRGF as graft (corneal and/or conjunctival) or dressing; they were also grouped according to the surgical subgroup of intervention (persistent corneal ulcer [PCU], keratoplasty, superficial keratectomy, corneal perforation, and pterygium)...
April 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29686390/tissue-remodeling-after-ocular-surface-reconstruction-with-denuded-amniotic-membrane
#4
Jing Jie, Jie Yang, Hui He, Jianlan Zheng, Wenyan Wang, Liying Zhang, Zhiyuan Li, Jingyao Chen, M Vimalin Jeyalatha, Nuo Dong, Huping Wu, Zuguo Liu, Wei Li
Amniotic membrane (AM) has been widely used as a temporary or permanent graft in the treatment of various ocular surface diseases. In this study, we compared the epithelial wound healing and tissue remodeling after ocular surface reconstruction with intact amniotic membrane (iAM) or denuded amniotic membrane (dAM). Partial limbal and bulbar conjunctival removal was performed on New Zealand rabbits followed by transplantation of cryo-preserved human iAM or dAM. In vivo observation showed that the epithelial ingrowth was faster on dAM compared to iAM after AM transplantation...
April 23, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29616744/craniofacial-development-discoveries-made-in-the-chicken-embryo
#5
John Abramyan, Joy M Richman
The aim of this review is to highlight some of the key contributions to our understanding of craniofacial research from work carried out with the chicken and other avian embryos. From the very first observations of neural crest cell migration to the fusion of the primary palate, the chicken has proven indispensable in facilitating craniofacial research. In this review we will look back to the premolecular studies where "cut and paste" grafting experiments mapped the fate of cranial neural crest cells, the role of different tissue layers in patterning the face, and more recently the contribution of neural crest cells to jaw size and identity...
2018: International Journal of Developmental Biology
https://www.readbyqxmd.com/read/29608393/histological-comparison-of-new-bone-formation-using-amnion-membrane-graft-vs-resorbable-collagen-membrane-an-animal-study
#6
Soheil Koushaei, Mohammad Hassan Samandari, Sayed Mohammad Razavi, Ahad Khoshzaban, Shahriar Adibi, Payam Varedi
The purpose of this article was to evaluate the bone induction effects of an amnion membrane protected graft compared with collagen membrane protected graft in repair of tibial bony defects in dogs. This study was performed using the tibial bone of dogs. After the removal of periostium, similar holes were made with a 16 mm trephine drill (38 holes in total). For the study group ten holes were covered by absorbable collagen and 16 holes by amniotic membrane. In control group 12 holes were made and were covered by the overlying soft tissue...
April 2, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29483819/risks-of-using-sterilization-by-gamma-radiation-the-other-side-of-the-coin
#7
REVIEW
C Randall Harrell, Valentin Djonov, Crissy Fellabaum, Vladislav Volarevic
The standard sterilization method for most medical devices over the past 40 years involves gamma irradiation. During sterilization, gamma rays efficiently eliminate microorganisms from the medical devices and tissue allografts, but also significantly change molecular structure of irradiated products, particularly fragile biologics such as cytokines, chemokines and growth factors. Accordingly, gamma radiation significantly alters biomechanical properties of bone, tendon, tracheal, skin, amnion tissue grafts and micronized amniotic membrane injectable products...
2018: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/29481675/human-amniotic-membrane-for-the-prevention-of-intradural-spinal-cord-adhesions-retrospective-review-of-its-novel-use-in-a-case-series-of-14-patients
#8
Corey T Walker, Jakub Godzik, U Kumar Kakarla, Jay D Turner, Alexander C Whiting, Peter Nakaji
BACKGROUND: Tethering after spinal surgery is caused by adhesions that arise from intradural tissue manipulation. Microsurgical detethering is the only treatment for symptomatic patients, but retethering occurs commonly and no treatment is widely available to prevent this complication. OBJECTIVE: To apply human amniotic membrane (HAM) grafts, which are immune-privileged and known to possess antifibrogenic properties, in patients requiring microsurgical detethering...
February 22, 2018: Neurosurgery
https://www.readbyqxmd.com/read/29443075/human-pluripotent-stem-cell-culture-on-polyvinyl-alcohol-co-itaconic-acid-hydrogels-with-varying-stiffness-under-xeno-free-conditions
#9
Tzu-Cheng Sung, Hsing-Fen Li, Akon Higuchi, Qing-Dong Ling, Jia-Sin Yang, Yeh-Chia Tseng, Chih-Hsien Pan Pan, Abdullah A Alarfaj, Murugan A Munusamy, Suresh Kumar, Shih-Tien Hsu, Kadarkarai Murugan
The effect of physical cues, such as the stiffness of biomaterials on the proliferation and differentiation of stem cells, has been investigated by several researchers. However, most of these investigators have used polyacrylamide hydrogels for stem cell culture in their studies. Therefore, their results are controversial because those results might originate from the specific characteristics of the polyacrylamide and not from the physical cue (stiffness) of the biomaterials. Here, we describe a protocol for preparing hydrogels, which are not based on polyacrylamide, where various stem, cells including human embryonic stem (ES) cells and human induced pluripotent stem (iPS) cells, can be cultured...
February 3, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29440793/use-of-an-amniotic-membrane-as-a-novel-barrier-in-a-tooth-with-a-questionable-prognosis
#10
Kanakamedala Anil Kumar, Muppalla Chakravarthy, Shalini Selvarajan, Theyagarajan Ramakrishnan, Geetha Ari
The chief goal of combination therapy using guided tissue regeneration along with bone grafts is to optimally and predictably regenerate the periodontal attachment apparatus. The evolution of regenerative therapy along with careful patient selection and treatment planning can have positive results even in cases which are not ideal. The present case report describes a tooth with a questionable prognosis treated successively by endodontic then periodontal therapy using an amniotic membrane along with a bone graft to treat an intrabony defect...
May 2017: Journal of Indian Society of Periodontology
https://www.readbyqxmd.com/read/29341292/amniotic-fluid-stem-cell-exosomes-therapeutic-perspective
#11
Francesca Beretti, Manuela Zavatti, Francesca Casciaro, Giuseppina Comitini, Fabrizia Franchi, Veronica Barbieri, Giovanni B La Sala, Tullia Maraldi
It is widely accepted that the therapeutic potential of stem cells can be largely mediated by paracrine factors, also included into exosomes. Thus, stem cell-derived exosomes represent a major therapeutic option in regenerative medicine avoiding, if compared to stem cells graft, abnormal differentiation and tumor formation. Exosomes derived from mesenchymal stem cells (MSC) induce damaged tissue repair, and can also exert immunomodulatory effects on the differentiation, activation and function of different lymphocytes...
January 16, 2018: BioFactors
https://www.readbyqxmd.com/read/29225157/the-effect-of-amniotic-membrane-grafting-on-healing-and-wound-strength-after-strabismus-surgery-in-a-rabbit-model
#12
Jeffrey B Kennedy, Marissa B Larochelle, Michelle G Pedler, J Mark Petrash, Robert W Enzenauer
BACKGROUND: Amniotic membrane grafts (AMGs) are used, with mixed results, as a platform for ocular healing and to reduce pathologic scarring. This study evaluated wound tensile strength and histopathologic changes after strabismus surgery with AMGs in 20 New Zealand white rabbits. METHODS: All subjects underwent 4 mm inferior rectus hang-back recessions to both eyes. The right eyes served as controls. Ten left eyes (group 1) received processed dehydrated amniotic membrane allografts (Ambiodry2, IOP Inc, Costa Mesa, CA) and ten left eyes (group 2) received cryopreserved human amniotic membrane allografts (AmnioGraft, Bio-Tissue, Miami, FL) between the sclera and muscle insertion and between the muscle and repositioned conjunctiva...
February 2018: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/29176451/comparison-of-pterygium-recurrence-rates-among-different-races-and-ethnicities-after-primary-pterygium-excision-by-surgeons-in-training
#13
Giovanni Campagna, Matthew Adams, Li Wang, Sumitra Khandelwal, Zaina Al-Mohtaseb
PURPOSE: To evaluate the impact of race and ethnicity, surgical technique, and level of surgeon training on recurrence rates after primary pterygium excision. METHODS: A retrospective review of patients who underwent primary pterygium excision at our academic institution was performed. The surgical technique-conjunctival autografting (CAG) or amniotic membrane grafting (AMG)-was chosen at the attending surgeon's discretion, and all surgeries were performed by surgeons in training...
February 2018: Cornea
https://www.readbyqxmd.com/read/29107055/native-and-synthetic-scaffolds-for-limbal-epithelial-stem-cell-transplantation
#14
REVIEW
Kim N Nguyen, Samantha Bobba, Alexander Richardson, Mijeong Park, Stephanie L Watson, Denis Wakefield, Nick Di Girolamo
Limbal stem cell deficiency (LSCD) is a complex blinding disease of the cornea, which cannot be treated with conventional corneal transplants. Instead, a stem cell (SC) graft is required to replenish the limbal epithelial stem cell (LESC) reservoir, which is ultimately responsible for regenerating the corneal epithelium. Current therapies utilize limbal tissue biopsies that harbor LESCs as well as tissue culture expanded cells. Typically, this tissue is placed on a scaffold that supports the formation of corneal epithelial cell sheets, which are then transferred to diseased eyes...
January 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29047409/novel-approach-to-gastric-mucosal-defect-repair-using-fresh-amniotic-membrane-allograft-in-dogs-experimental-study
#15
Haithem A Farghali, Naglaa A AbdElKader, Marwa S Khattab, Huda O AbuBakr
BACKGROUND: Gastric mucosal defect could result from several causative factors including the use of nonsteroidal anti-inflammatory drugs, Helicobacter pylori infection, gastrointestinal and spinal cord diseases, and neoplasia. This study was performed to achieve a novel simple, inexpensive, and effective surgical technique for the repair of gastric mucosal defect. METHODS: Six adult male mongrel dogs were divided into two groups (three dogs each). In the control positive group (C + ve), dogs were subjected to surgical induction of gastric mucosal defect and then treated using traditional medicinal treatment for such a condition...
October 18, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28941146/tracheal-repair-with-acellular-human-amniotic-membrane-in-a-rabbit-model
#16
Lianna Ferrari Jorge, Julio C Francisco, Nelson Bergonse, Cristina Baena, Katherine Athayde T Carvalho, Eltyeb Abdelwahid, Jose Rocha Faria Neto, Luiz Felipe Pinho Moreira, Luiz Cesar Guarita-Souza
Surgical correction of tracheal stenosis is still a complex and challenging procedure. Acellular human amniotic membranes (AHAM) represent a promising biomaterial source for tissue regeneration. The aim of this study was to evaluate whether AHAM grafts improve tissue regeneration of the trachea in a rabbit model of tracheostomy. Twenty rabbits were randomized into 2 groups. Animals in the control group underwent surgical tracheostomy only, and animals in the AHAM group underwent surgical tracheostomy and received an AHAM graft that covered the defect site...
September 22, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28933697/enhanced-skin-regeneration-using-a-novel-amniotic-derived-tissue-graft
#17
Katie C Mowry, Paul P Bonvallet, Susan L Bellis
BACKGROUND: Chronic and recalcitrant wounds present a significant therapeutic challenge. Amniotic tissues contain many regenerative cytokines, growth factors, and extracellular matrix molecules including proteoglycans, hyaluronic acid, and collagens I, III, and IV. Dehydrated amnion/chorion grafts are currently used to treat a variety of wounds such as diabetic foot ulcers and burns. OBJECTIVE: The investigators hypothesized that processing methodologies, dehydration, and hypothermic processing and storage of amniotic tissues would affect overall quality of wound healing; they compared dehydrated amnion/chorion (dHACM) grafts to a novel hypothermically stored amniotic membrane (HSAM) graft in a full-thickness rat wound model...
September 2017: Wounds: a Compendium of Clinical Research and Practice
https://www.readbyqxmd.com/read/28928772/tissue-engineering-to-repair-diaphragmatic-defect-in-a-rat-model
#18
G P Liao, Y Choi, K Vojnits, H Xue, K Aroom, F Meng, H Y Pan, R A Hetz, C J Corkins, T G Hughes, F Triolo, A Johnson, Kenneth J Moise, K P Lally, C S Cox, Y Li
Tissue engineering is an emerging strategy for repairing damaged tissues or organs. The current study explored using decellularized rat diaphragm scaffolds combined with human amniotic fluid-derived multipotent stromal cells (hAFMSC) to provide a scaffold, stem cell construct that would allow structural barrier function during tissue ingrowth/regeneration. We created an innovative cell infusion system that allowed hAFMSC to embed into scaffolds and then implanted the composite tissues into rats with surgically created left-sided diaphragmatic defects...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28882402/visceral-endoderm-and-the-primitive-streak-interact-to-build-the-fetal-placental-interface-of-the-mouse-gastrula
#19
Adriana M Rodriguez, Karen M Downs
Hypoblast/visceral endoderm assists in amniote nutrition, axial positioning and formation of the gut. Here, we provide evidence, currently limited to humans and non-human primates, that hypoblast is a purveyor of extraembryonic mesoderm in the mouse gastrula. Fate mapping a unique segment of axial extraembryonic visceral endoderm associated with the allantoic component of the primitive streak, and referred to as the "AX", revealed that visceral endoderm supplies the placentae with extraembryonic mesoderm...
December 1, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28700252/modified-allogenic-simple-limbal-epithelial-transplantation-followed-by-keratoplasty-as-treatment-for-total-limbal-stem-cell-deficiency
#20
Alfonso Vasquez-Perez, Mayank A Nanavaty
PURPOSE: To describe a modified allogenic simple limbal epithelial transplant (SLET) technique with large donor tissue explants followed by keratoplasty. METHODS: A 69-year-old with conjunctival melanoma on her left eye developed total limbal stem cell deficiency (LSCD) after multiple cycles of topical mitomycin. She also had herpes stromal keratitis while on treatment with mitomycin. She underwent modified allogenic SLET with large donor limbal tissue explants glued on the cornea directly and the amniotic membrane placed over the limbal explants...
July 12, 2017: Ocular Immunology and Inflammation
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