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Amniotic tissue graft

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https://www.readbyqxmd.com/read/28882402/visceral-endoderm-and-the-primitive-streak-interact-to-build-the-fetal-placental-interface-of-the-mouse-gastrula
#1
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. Exfoliation of the AX was dependent upon contact with the primitive streak, which modulated Hedgehog signaling...
September 4, 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
#2
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
https://www.readbyqxmd.com/read/28675062/lung-regeneration-using-amniotic-fluid-mesenchymal-stem-cells
#3
Alireza Azargoon, Babak Negahdari
Respiratory diseases, such as chronic obstructive pulmonary disease (COPD), pulmonary hypertension and lung fibrosis, are yet a major challenge in the world and they result in irreversible structural lung damage. Lung transplantation as the only therapeutic option face some major challenges like graft rejection and cancer, arising as a result of immunosuppression. A low survival rate faced by lung transplantation patients is presently limited to approximately 5 years. Lungs shortage therefore calls for a mechanism that would increase the availability of suitable organs for transplantation...
July 4, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28586928/-biomaterials-or-donor-tissue-what-is-the-future-of-tissue-engenieering-for-cornea-reconstruction
#4
Björn O Bachmann, Stefan Schrader
For the replacement of corneal tissue, corneal grafts or amniotic membrane are still used as a standard material. Since this is biological tissue, there is only a limited standardization regarding preparation, tissue properties and behaviour after transplantation. In addition, there is a risk of disease transmission, and the availability of both human corneas and amniotic membrane is insufficient in many regions of the world, which is why alternative biomaterials have been explored for many years now. Among the natural biomaterials, materials based on collagen or keratin provide characteristics that make them good candidates for corneal tissue replacement...
June 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28557902/cryopreserved-amniotic-membrane-improves-clinical-outcomes-following-microdiscectomy
#5
D Greg Anderson, Victor Popov, Andrew L Raines, Julie O'Connell
STUDY DESIGN: Prospective, randomized controlled trial. OBJECTIVE: To compare pain, physical/mental functional recovery and recurrent herniation for patients following lumbar microdiscectomy with and without the use of a cryopreserved amniotic tissue graft. SUMMARY OF BACKGROUND DATA: Although microdiscectomy procedures are routinely successful for patients with lumbar radiculopathy due to herniated disc disease, residual low back pain, and recurrent herniation remain unsolved clinical problems...
May 26, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28548553/human-amniotic-membrane-is-not-suitable-for-the-grafting-of-colon-lesions-and-prevention-of-adhesions-in-a-xenograft-rat-model
#6
Dimitri Barski, Holger Gerullis, Thorsten Ecke, Gabriella Varga, Mihaly Boros, Isabel Pintelon, Jean-Pierre Timmermans, Thomas Otto
INTRODUCTION: New biological materials are needed for specific applications in reconstructive bowel surgery and for the prevention of adhesion formation. Amniotic membranes (AMs) are assumed to have a number of unique characteristics that enhance the ingrowth of the surrounding tissue. The aim of the present study was to provide proof of these qualities in a xenograft model. MATERIALS AND METHODS: A multilayer human AM (HAM) was applied to repair defined colon wall defects in Sprague-Dawley rats (n = 18)...
May 1, 2017: Surgical Innovation
https://www.readbyqxmd.com/read/28512421/when-an-easy-thing-goes-wrong-foreign-body-induced-granuloma-associated-scleritis-following-pterygium-surgery
#7
Pedro Coelho, Carlos Menezes, Pedro Rodrigues, Rita Gonçalves, Tiago Maio, Jorge Moreira, Paula Tenedório
PURPOSE: To report a case of pterygium surgery with conjunctival autograft followed by focal necrotizing scleritis due to foreign body entrapment in the scleral bed. CASE REPORT/RESULTS: This is a case report of a 76-years-old male patient who underwent nasal pterygium surgery and developed focal necrotizing scleritis secondary to foreign body entrapment under conjunctival autograft. One month following surgery, slit-lamp examination demonstrated a progressive thinning of the surgical area with focal inflammatory signs...
January 2017: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/28363256/transplantation-of-amniotic-scaffold-seeded-mesenchymal-stem-cells-and-or-endothelial-progenitor-cells-from-bone-marrow-to-efficiently-repair-3-cm-circumferential-urethral-defect-in-model-dogs
#8
Chen Chen, Shuxin Zheng, Xinke Zhang, Pengxiu Dai, Yongping Gao, Liangliang Nan, Yihua Zhang
The treatment options for patients with a urethral defect are limited by the availability of autologous tissues. We hypothesized that transplantation of decellularized human amniotic scaffolds (dHAS) seeded with allogeneic bone marrow mesenchymal cells (BMSCs) and/or endothelial progenitor cells (EPCs) may serve as a promising repair strategy for long segment of circumferential urethral defect. To verify the hypothesis, with urinary catheterization, a 3-cm segment of whole urethra in 25 male mongrel dogs was excised and replaced by dHAS seeded with allogeneic BMSCs and/or EPCs...
August 22, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28344763/utility-of-human-amniotic-membrane-allograft-in-re-epithelialization-of-the-nasal-tip
#9
D'Antonio C Dennis, Adam R Turnock, Collin Sutton, Bradley Chastant, Wesley B Vanderlan
Variations in skin thickness and contours pose significant challenges to reconstruction of the lower third of the nose. Human amniotic membrane allograft offers a potential alternative to tissue transfer in reconstruction of the lower third of the nose. We reviewed the procedure and photographs of a healthy 56-year-old male with a 22 × 18 mm lower third nasal defect involving full thickness skin and subcutaneous tissue. Following preparation for grafting, dehydrated human amniotic membrane was fashioned to the dimensions of the defect and applied...
October 2016: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/28320452/compared-to-the-amniotic-membrane-wharton-s-jelly-may-be-a-more-suitable-source-of-mesenchymal-stem-cells-for-cardiovascular-tissue-engineering-and-clinical-regeneration
#10
Lei Pu, Mingyao Meng, Jian Wu, Jing Zhang, Zongliu Hou, Hui Gao, Hui Xu, Boyu Liu, Weiwei Tang, Lihong Jiang, Yaxiong Li
BACKGROUND: The success of developing cardiovascular tissue engineering (CTE) grafts greatly needs a readily available cell substitute for endothelial and interstitial cells. Perinatal annexes have been proposed as a valuable source of mesenchymal stem cells (MSCs) for tissue engineering and regenerative medicine. The objective of the present study is to evaluate the potential of human Wharton's jelly MSCs (WJ-MSCs) and amniotic membrane MSCs (AM-MSCs) as a seeding cell in CTE and cardiovascular regenerative medicine...
March 21, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28224047/identification-of-extracellular-matrix-components-and-biological-factors-in-micronized-dehydrated-human-amnion-chorion-membrane
#11
Jennifer Lei, Lauren B Priddy, Jeremy J Lim, Michelle Massee, Thomas J Koob
Objective: The use of bioactive extracellular matrix (ECM) grafts such as amniotic membranes is an attractive treatment option for enhancing wound repair. In this study, the concentrations, activity, and distribution of matrix components, growth factors, proteases, and inhibitors were evaluated in PURION(®) Processed, micronized, dehydrated human amnion/chorion membrane (dHACM; MiMedx Group, Inc.). Approach: ECM components in dHACM tissue were assessed by using immunohistochemical staining, and growth factors, cytokines, proteases, and inhibitors were quantified by using single and multiplex ELISAs...
February 1, 2017: Advances in Wound Care
https://www.readbyqxmd.com/read/28007491/a-novel-experimental-method-for-penile-augmentation-urethroplasty-with-a-combination-of-buccal-mucosa-and-amniotic-membrane-in-a-rabbit-model
#12
Mustafa Güneş, Muammer Altok, Özlem Özmen, Mehmet Umul, Alime Güneş, Ercan Baş, Zafer Özyildiz, Tolga Taha Sönmez, Hikmet Orhan
OBJECTIVE: To investigate the results of penile urethral reconstruction using amniotic membrane (AM) and buccal mucosa (BM) grafts, and the simultaneous use of both in a rabbit model. MATERIALS AND METHODS: A total of 28 male rabbits were divided into 4 groups according to grafting style: group 1 (AM), group 2 (BM), group 3 (BM + AM), and group 4 (sham). A standardized urethral defect was created in the 3 initial groups. The sham group underwent only a ventral vertical urethral incision and primary re-suturation...
December 19, 2016: Urology
https://www.readbyqxmd.com/read/27921031/amniotic-epithelial-cells-a-new-tool-to-combat-aging-and-age-related-diseases
#13
Clara Di Germanio, Michel Bernier, Rafael de Cabo, Barbara Barboni
The number of elderly people is growing at an unprecedented rate and this increase of the aging population is expected to have a direct impact on the incidence of age-related diseases and healthcare-associated costs. Thus, it is imperative that new tools are developed to fight and slow age-related diseases. Regenerative medicine is a promising strategy for the maintenance of health and function late in life; however, stem cell-based therapies face several challenges including rejection and tumor transformation...
2016: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/27904501/human-amniotic-epithelial-cells-combined-with-silk-fibroin-scaffold-in-the-repair-of-spinal-cord-injury
#14
Ting-Gang Wang, Jie Xu, Ai-Hua Zhu, Hua Lu, Zong-Ning Miao, Peng Zhao, Guo-Zhen Hui, Wei-Jiang Wu
Treatment and functional reconstruction after central nervous system injury is a major medical and social challenge. An increasing number of researchers are attempting to use neural stem cells combined with artificial scaffold materials, such as fibroin, for nerve repair. However, such approaches are challenged by ethical and practical issues. Amniotic tissue, a clinical waste product, is abundant, and amniotic epithelial cells are pluripotent, have low immunogenicity, and are not the subject of ethical debate...
October 2016: Neural Regeneration Research
https://www.readbyqxmd.com/read/27843896/surgical-reconstruction-of-ocular-surface-tumors-using-fibrin-sealant-tissue-adhesive
#15
Aline Roseane Queiroz de Paiva, Larissa Abreu de Azevedo Fraga, Virgínia Laura Lucas Torres
PURPOSE: To evaluate the surgical outcomes of ocular surface reconstruction in corneal-conjunctival tumors using fibrin tissue adhesive. METHODS: A prospective noncomparative study was performed between May 2013 and February 2015. Patients were submitted to routine surgical procedure for corneal-conjunctival tumor excision followed by amniotic membrane graft transplantation using fibrin tissue adhesive (Evicel®, Omrix Biopharmaceuticals Ltd., Israel). Results were assessed on the 1st, 7th, 15th and 30th postoperative days to analyze subjective complaints, adhesiveness and positioning of the graft, potential complications and recurrences...
October 2016: Ocular Oncology and Pathology
https://www.readbyqxmd.com/read/27788828/decellularized-amniotic-membrane-scaffold-as-a-pericardial-substitute-an-in%C3%A2-vivo-study
#16
J C Francisco, R Correa Cunha, M A Cardoso, R Baggio Simeoni, B F Mogharbel, G L Picharski, D Silva Moreira Dziedzic, L C Guarita-Souza, K A T Carvalho
BACKGROUND: In the development of new biomaterials for pericardium substitute, acellular amniotic membrane (AAM) presents potential for new applications in regenerative medicine. We studied an AAM as a pericardial substitute to achieve a suitable, cost effective, abundant matrix for the purpose of using it as graft for tissue repair. METHODS: Twenty Wistar rats were randomly divided into 2 groups (n = 10/group) and had their pericardiums excised. In the experimental group, the excised pericardium segment was substituted by a 7-mm-diameter patch of decellularized AAM sutured to the lesion area...
October 2016: Transplantation Proceedings
https://www.readbyqxmd.com/read/27651882/clinical-comparison-of-coronally-advanced-flap-plus-amniotic-membrane-or-subepithelial-connective-tissue-in-the-treatment-of-miller-s-class-i-and-ii-gingival-recessions-a-split-mouth-study
#17
Ardeshir Lafzi, Nader Abolfazli, Masoumeh Faramarzi, Masoumeh Eyvazi, Amir Eskandari, Fariba Salehsaber
Background. The aim of the present study was to compare coronally advanced flap (CAF) plus amniotic membrane (AM) to CAF with connective tissue graft (CTG) in the treatment of Miller's class I and II gingival recessions. Methods. Eleven healthy subjects with thirty Miller's class І and ІІ gingival recessions ≥3 mm, were selevted for this research and randomly assigned to two groups in a split-mouth design. In the control group gingival recessions were treated with CAF and CTG; however, in the test group the lesions were treated with (AM) and CAF...
2016: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/27649406/comparing-the-efficacy-of-viable-cryopreserved-placental-membrane-for-the-treatment-of-wounds-of-diverse-etiologies
#18
Derek S Anselmo, Marc Karpo, Ebony Love, Tracey Vlahovic
INTRODUCTION AND OBJECTIVES: The benefits of using amniotic tissue in skin regeneration are well documented. Today, cryopreservation technology allows for better availability and maintenance of mesenchymal stem cells. This is of particular interest in treating the diabetic foot ulcer as this population has fewer mesenchymal stem cells. The objective of this case series investigation was to compare the efficacy of cryopreserved human amniotic stem cells in treating foot wounds of different etiologies...
September 2016: Journal of the American Podiatric Medical Association
https://www.readbyqxmd.com/read/27507558/long-term-result-of-autologous-cultivated-oral-mucosal-epithelial-transplantation-for-severe-ocular-surface-disease
#19
Pinnita Prabhasawat, Pattama Ekpo, Mongkol Uiprasertkul, Suksri Chotikavanich, Nattaporn Tesavibul, Kanograt Pornpanich, Panitee Luemsamran
The present study aimed to investigate the clinical outcomes of autologous cultivated oral mucosal epithelial transplantation (COMET) on human amniotic membrane (AM) for corneal limbal stem cell deficiency (LSCD). In this prospective, noncomparative case series, 20 eyes (18 patients) with bilateral severe ocular surface disease were chosen to undergo COMET on human AM. The primary outcome was clinical success, and the secondary outcomes were the best-corrected visual acuity difference, corneal opacification, symblepharon formation, and complications...
September 2016: Cell and Tissue Banking
https://www.readbyqxmd.com/read/27453750/new-clinical-application-of-amniotic-membrane-transplant-for-ocular-surface-disease
#20
A Gheorghe, M Pop, M Burcea, M Serban
UNLABELLED: The new defined anatomical and functional complex conjunctiva-limbus-cornea is a new concept, which helps clinicians better understand and treat ocular surface pathologies. The management of the ocular surface disease has changed dramatically over the years, with spectacular improvements of techniques, and of course, results. The amniotic membrane, used as a graft or as a substrate for the cultivation of limbal corneal cells has showed encouraging results. AIM: To investigate the usefulness of amniotic membrane transplantation in ocular surface pathologies...
April 2016: Journal of Medicine and Life
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