Topic
Transplantation
About: Transplantation is a research topic. Over the lifetime, 276584 publications have been published within this topic receiving 7961661 citations.
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TL;DR: At 1 year after surgery, the transplanted sheet of retinal pigment epithelial cells remained intact, best corrected visual acuity had not improved or worsened, and cystoid macular edema was present.
Abstract: We assessed the feasibility of transplanting a sheet of retinal pigment epithelial (RPE) cells differentiated from induced pluripotent stem cells (iPSCs) in a patient with neovascular age-related macular degeneration. The iPSCs were generated from skin fibroblasts obtained from two patients with advanced neovascular age-related macular degeneration and were differentiated into RPE cells. The RPE cells and the iPSCs from which they were derived were subject to extensive testing. A surgery that included the removal of the neovascular membrane and transplantation of the autologous iPSC-derived RPE cell sheet under the retina was performed in one of the patients. At 1 year after surgery, the transplanted sheet remained intact, best corrected visual acuity had not improved or worsened, and cystoid macular edema was present. (Funded by Highway Program for Realization of Regenerative Medicine and others; University Hospital Medical Information Network Clinical Trials Registry [UMIN-CTR] number, UMIN000011929.)
1,023 citations
TL;DR: The progressive increase in strength was correlated with the degree of bone ingrowth, mineralization, and maturation of the healing tissue, noted histologically.
Abstract: Our study evaluated tendon-to-bone healing in a dog model. Twenty adult mongrel dogs had a transplantation of the long digital extensor tendon into a 4.8-millimeter drill-hole in the proximal tibial metaphysis. Four dogs were killed at each of five time-periods (two, four, eight, twelve, and twenty-six weeks after the transplantation), and the histological and biomechanical characteristics of the tendon-bone interface were evaluated. Serial histological analysis revealed progressive reestablishment of collagen-fiber continuity between the bone and the tendon. A layer of cellular, fibrous tissue was noted between the tendon and the bone, along the length of the bone tunnel; this layer progressively matured and reorganized during the healing process. The collagen fibers that attached the tendon to the bone resembled Sharpey fibers. High-resolution radiographs showed remodeling of the trabecular bone that surrounded the tendon. At the two, four, and eight-week time-periods, all specimens had failed by pull-out of the tendon from the bone tunnel. The strength of the interface was noted to have significantly and progressively increased between the second and the twelfth week after the transplantation. At the twelve and twenty-six-week time-periods, all specimens had failed by pull-out of the tendon from the clamp or by mid-substance rupture of the tendon. The progressive increase in strength was correlated with the degree of bone ingrowth, mineralization, and maturation of the healing tissue, noted histologically.
1,022 citations
TL;DR: The results suggest that Notch1 provides a key regulatory signal in determining T lymphoid versus B lymphoid lineage decisions, possibly by influencing lineage commitment from a common lymphoid progenitor cell.
1,021 citations
TL;DR: Creation of a bioartificial lung requires engineering of viable lung architecture enabling ventilation, perfusion and gas exchange, and regenerated lungs into orthotopic position showed in vivo function.
Abstract: About 2,000 patients now await a donor lung in the United States. Worldwide, 50 million individuals are living with endstage lung disease. Creation of a bioartificial lung requires engineering of viable lung architecture enabling ventilation, perfusion and gas exchange. We decellularized lungs by detergent perfusion and yielded scaffolds with acellular vasculature, airways and alveoli. To regenerate gas exchange tissue, we seeded scaffolds with epithelial and endothelial cells. To establish function, we perfused and ventilated cellseeded constructs in a bioreactor simulating the physiologic environment of developing lung. By day 5, constructs could be perfused with blood and ventilated using physiologic pressures, and they generated gas exchange comparable to that of isolated native lungs. To show in vivo function, we transplanted regenerated lungs into orthotopic position. After transplantation, constructs were perfused by the recipient’s circulation and ventilated by means of the recipient’s airway and respiratory muscles, and they provided gas exchange in vivo for up to 6 h after extubation.
1,020 citations
Johns Hopkins University School of Medicine1, Harvard University2, University of Alberta3, University of Basel4, University of California, Los Angeles5, Catholic University of Leuven6, University of Pittsburgh7, Vanderbilt University8, University of Leicester9, University of Helsinki10, University of Iowa11, Yale University12, University of Texas Health Science Center at Houston13, Nagoya City University14, University of North Carolina at Chapel Hill15, University of Vienna16, University of Barcelona17, Cornell University18, Rockyview General Hospital19
TL;DR: This article presents international consensus criteria for and classification of AbAR developed based on discussions held at the Sixth Banff Conference on Allograft Pathology in 2001, to be revisited as additional data accumulate in this important area of renal transplantation.
1,018 citations