Search results for "Allotransplantation"
showing 9 items of 9 documents
INFLUENCE OF ISLET TRANSPORTATION ON PANCREATIC ISLET ALLOTRANSPLANTATION IN TYPE 1 DIABETIC PATIENTS WITHIN THE SWISS-FRENCH GRAGIL NETWORK
2004
The influence of islet transportation on pancreatic islet allotransplantation in type 1 diabetic patients was evaluated within the GRAGIL network.From December 2001 to April 2003, 16 human pancreatic islet transplants were performed in 9 type 1 diabetic patients with an established kidney graft (functioning for at least 6 months) in four centers of the GRAGIL network. Islet isolation was performed in a core laboratory in Geneva, and the islet preparations were shipped by ambulance to each center for transplantation. One month after transplantation, the efficiency of the graft was assessed according to islet transportation time (ITT): ITT less than 2 hours (group 1, n=5), and ITT greater tha…
MicroRNAs in solid organ and vascularized composite allotransplantation: Potential biomarkers for diagnosis and therapeutic use
2020
Abstract Nowadays, solid organ transplantation (SOT) is an established treatment for patients with end-organ dysfunction, which dramatically improves the quality-of-life. Vascularized composite allotransplants (VCAs) including hand and face have been reported worldwide over the last 20 years. However, VCAs, differently to SOT, are life-enhancing instead of life-saving and are not routinely performed due to the risk of immune rejection and the adverse effects of immunosuppression. Over the past decade, although considerable improvements in short-term outcomes after allotransplantation have been registered, these results have not been translated into major progress in long-term allograft acce…
Campath-1H-Based Reduced-Intensity Conditioning Followed by Allogeneic Blood Stem-Cell Transplantation and Preemptive CD8-Depleted Donor Lymphocyte I…
2004
Abstract Recent reports have demonstrated the feasibility of using the anti-CD52 antibody Campath-1H for in vivo T-cell depletion (TCD) in the context of a fludarabine/melphalan-based reduced-intensity conditioning regimen (Kottaridis et al. Blood 2000, 96:2419). Major disadvantage of this protocol is the severe immunosuppression which results in an increased rate of opportunistic infections and disease relapses. Donor lymphocyte infusions (DLI) are frequently used to overcome this limitation. The application of DLI, however, is associated with a profound risk of GvHD. Depletion of CD8+ lymphocytes from either the allotransplant or from DLI has proven feasible to reduce the incidence of GvH…
Enhanced Drug Delivery to the Skin Using Liposomes
2018
Background:. Enhancing drug delivery to the skin has importance in many therapeutic strategies. In particular, the outcome in vascularized composite allotransplantation mainly depends on systemic immunosuppression to prevent and treat episodes of transplant rejection. However, the side effects of systemic immunosuppression may introduce substantial risk to the patient and are weighed against the expected benefits. Successful enhancement of delivery of immunosuppressive agents to the most immunogenic tissues would allow for a reduction in systemic doses, thereby minimizing side effects. Nanoparticle-assisted transport by low temperature–sensitive liposomes (LTSLs) has shown some benefit in a…
Immunomodulation in vascularized composite allotransplantation: What is the role for adipose-derived stem cells?
2019
Hand and face transplants are becoming increasingly common, recording progressively more penile, uterus, abdominal wall, and allotransplantation cases reported worldwide. Despite current protocols allow long-term survival of the allografts, the ultimate goal of donor-specific tolerance has not been achieved yet. In fact, the harmful adverse effects related to the lifelong administration of immunosuppressive agents are the main drawbacks for vascularized composite allotransplantations. Research is very active in investigating alternative methods to induce greater tolerance while minimizing toxicity. Adipose-derived stem cells (ASCs) represent promising cell therapies for immunomodulation in …
Analysis of Immunomodulatory Properties of Spheroids from Adipose-derived Stem Cells
2020
Purpose: Adipose Stem Cells (ASCs) represent promising cell therapies for regenerative medicine and immunomodulation. The recently isolated spheroids from adipose-derived stem cells (S-ASCs) have shown being superior stemness and enhanced regenerative capability than the classical ASCs. The aims of this study were (1) to investigate the effects of adipose tissue donor-site, harvesting technique and patients’ characteristics on the yield of S-ASCs and (2) to investigate the immunomodulatory properties of S-ASCs comparing them with the adherent ASCs. Material and Methods: The study was divided into two phases. Phase I (prospective clinical study) between July 2016 and August 2019 was conducte…
TRANSPLANTATION AND IN VITRO ANALYSIS OF SOYBEAN-AGGLUTININ SEPARATED MOUSE SPLEEN CELLS
1984
In human bone marrow allotransplantation, an in vitro method using soybean agglutinin(SBA) for enrichment of stem cells and depletion of mature T cells in the graft has been described (Reisner et al.;Lancet 2:1320,1980).To define the quality of the method,mouse spleen cells (C3H, C57/B6,BALB/c)containing about 30% of mature T cells were separated by SBA.The composition and functional capacity of the cell fraction known to contain the stem cells were characterized in vitro after each of two SBA-separation steps.In addition, the ability of the cell fraction to reconstitute successfully allogeneic irradiated (900R) mice was investigated. Only the two step SBA-separation procedure yielded satis…
Vascularized composite allotransplantation - a Council of Europe position paper
2017
After more than 120 hand-upper extremity and 37 face transplant procedures performed worldwide, vascularized composite allotransplantation (VCA) now falls under the scope of organ transplant legislation in Europe and the United States. While in the USA, VCA has been considered as standard care since 2014, VCA in Europe is still performed through clinical research trials, except in United Kingdom. However, after two decades of favourable experience with upper extremity transplantation (UET), professionals in Europe are proposing hand allotransplantation as “controlled standard” care, as opposed to face transplantation (FT), which is still a challenging activity. The European Committee on Org…
Non-HLA Antibodies in Hand Transplant Recipients Are Connected to Multiple Acute Rejection Episodes and Endothelial Activation
2022
The role of anti-HLA antibodies in transplant rejection is well-known but the injury associated with non-HLA antibodies is now widely discussed. The aim of our study was to investigate a role of non-HLA antibodies in hand allografts rejection. The study was performed on six patients after hand transplantation. The control group consisted of: 12 kidney transplant recipients and 12 healthy volunteers. The following non-HLA antibodies were tested: antibody against angiotensin II type 1 receptor (AT1R-Ab), antibody against endothelin-1 type-A-receptor (ETAR-Ab), antibody against protease-activated receptor 1 (PAR-1-Ab) and anti-VEGF-A antibody (VEGF-A-Ab). Chosen proinflammatory cytokines (Il-1…