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Fry L.J.,Nottingham Trent University | Querol S.,Banc de Sang I Teixits | Gomez S.G.,Nottingham Trent University | Mcardle S.,Nottingham Trent University | And 2 more authors.
Vox Sanguinis | Year: 2015

Background and Objectives: Advantages of using cord blood (CB) over other sources of haematopoietic progenitor cells, such as bone marrow, include the ability to cryopreserve and bank the samples until requested for a transplant. Cryopreservation requires the addition of a cryoprotectant to prevent the formation of intracellular ice during freezing. Dimethyl sulphoxide (DMSO) is commonly used at a concentration of 10% (v/v); however, there is evidence to suggest this chemical is toxic to cells as well as to patients after infusion. Materials and Methods: The toxic effects of DMSO were assessed through cell viability and in vitro functional assays in fresh and post-thaw CB samples before determining the maximum exposure time and optimal concentration for cryopreservation. Results: A dose-dependent toxicity of DMSO was observed in fresh samples with 40% removing all viable and functional haematopoietic progenitor cells (HPC). In fresh and post-thaw analysis, minimal toxic effect was observed when cryopreservation was delayed for up to 1 h after 10% DMSO addition. After thawing, DMSO washout was superior to dilution or unmanipulated when maintained for long periods (advantage observed 1 h after thawing). Finally, the optimum concentration for cryopreserving CB was found to be 7·5 to 10% with detrimental effects observed outside of this range. Conclusion: These results support the use of 7·5-10% as the optimal DMSO concentration and the maximum exposure time should be limited to <1 h prior to freezing and 30 min post-thaw. © 2015 International Society of Blood Transfusion.

Navarro Martinez-Cantullera A.,Banc de Sang I Teixits
Archivos de la Sociedad Espanola de Oftalmologia | Year: 2016

Cornea transplant is the most common tissue transplant in the world. In Spain, tissue donation activities depend upon transplant coordinator activities and the well-known Spanish model for organ and tissue donation. Tissue donor detection system and tissue donor evaluation is performed mainly by transplant coordinators using the Spanish model on donation. The evaluation of a potential tissue donor from detection until recovery is based on an exhaustive review of the medical and social history, physical examination, family interview to determine will of the deceased, and a laboratory screening test. Corneal acceptance criteria for transplantation have a wider spectrum than other tissues, as donors with active malignancies and infections are accepted for kearatoplasty in most tissue banks.Corneal evaluation during the whole process is performed to ensure the safety of the donor and the recipient, as well as an effective transplant. Last step before processing, corneal recovery, must be performed under standard operating procedures and in a correct environment. © 2016 Sociedad Española de Oftalmología.

Callejo J.,University of Barcelona | Salvador C.,University of Barcelona | Gonzalez-Nunez S.,University of Barcelona | Almeida L.,University of Barcelona | And 4 more authors.
Journal of Ovarian Research | Year: 2013

Currently, cryopreservation of oocytes, embryos and ovarian tissue is considered the basis of fertility preservation programs for women with cancer and other diseases who are rendered sterile by gonadotoxic drugs or radiation.Numerous studies have confirmed that autograft of frozen-thawed ovarian tissue can restore ovarian function and fertility. A total of twenty-two live births have been reported but we still have to consider this technique as experimental. The main problem is that the implant undergoes ischemia until neoangiogenesis is restored, resulting in significant follicular loss.At the moment, there are numerous publications in different medical fields that publish successful experiences with plasma rich in platelets (PRP) in different clinical situations promoting angiogenesis. Thus, we considered the possibility of using it in the field of ovarian autologous transplantation in order to improve the vascularization of the implant and its quality. For this, both thawed ovarian tissue as practiced pockets on the rear side of the broad ligament which have been placed, have been impregnated with PRP. We can say that the implant treated in this way has had a rapid and successful response.We report a special interesting case because this is the first time that this technique is performed successfully in a woman without ovaries combined with growth factors to promote neoangiogenesis. Obviously, the results of the hormonal response come exclusively from the implanted tissue in these special conditions. © 2013 Callejo et al.; licensee BioMed Central Ltd.

Garcia J.,Banc de Sang I Teixits
Transfusion and Apheresis Science | Year: 2010

Today Cord Blood (CB) Transplants are accepted as a therapeutic resource for the treatment of a variety of disorders, comparing in some cases, with transplants performed with other sources of progenitors. Unrelated Cord Blood Banks (CBBs) have significantly contributed to this improvement by the improvement on the knowledge of the CB biology and technical developments. Today, there are more than 100 active Cord Blood Banks (CBB), with an inventory of more than 400,000 units, which have generated more than 10000 cord blood transplants all around the world. Access to the world-wide CB inventory, as well as the hemopoietic progenitors inventory from adult donors, is a rather complex task which is continuously subject to improvements and consolidations. The growing numbers of CBBs and the search for efficiency has driven them to constitute or adapt consolidated data bases and access systems, and to develop a number of registries or networks to improvedthe access to inventories. The purpose of the present article is to provide a general overview on the number of CB units stored around the word, the quality accreditation systems and how the CB networks and their national and international inventories and registries are organized in order to support the, every time more efficient search for suitable CB units for patients lacking family donors. © 2010.

The present invention relates to a method for obtaining a tissue engineering product designed to regenerate cartilage tissue, said product comprising expanded bone marrow mesenchymal cells, a non-cellular matrix and a fibrin gel, the method comprising the steps of: (a) expanding the mesenchymal cells; (b) conjugating the mesenchymal cells to the matrix; (c) washing the product obtained in step (b); and (d) mixing the product obtained in step (c) with a fibrin gel.

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