Vigencia de los bancos de tejidos laminares / Validity of tissue Banks

INTRODUCCIÓN Y OBJETIVO: En las unidades de quemados de Colombia, como en las del resto del mundo, se ha vivido la necesidad de dar cobertura cutánea transitoria y definitiva a los pacientes con quemaduras. El objetivo del presente trabajo es revisar brevemente la historia de las coberturas cutáneas, la creación de los bancos de piel, principalmente en Latinoamérica y Colombia, su importancia y su futuro. Material y Método. Realizamos una revisión bibliográfica de las coberturas cutáneas, de la creación y actual existencia de los bancos de tejidos en el mundo y realizamos una encuesta para recabar datos sobre el tema a los directores de los bancos de tejidos laminares de América Latina. RESULTADOS: La necesidad de cobertura cutánea para las heridas por trauma ha existido desde la antigüedad, con diferentes alternativas autólogas y heterólogas. Con el surgimiento de enfermedades infecciosas como el SIDA, se creó la necesidad de ofrecer tejidos de calidad y seguros, lo que desencadenó la creación de bancos de teji¬dos que produjeron apósitos biológicos transitorios. El incremento de la supervivencia de los pacientes con quemaduras extensas y profundas creó el reto de ofrecer coberturas definitivas para disminuir las secuelas del paciente quemado. Hasta el momento, no existen publicaciones que demuestren cuáles son las mejores alternativas. CONCLUSIÓNES: Los bancos de tejidos siguen vigentes puesto que se requieren tanto los tejidos biológicos transitorios como los sustitutos dérmicos que se están investigando y produciendo. No existe aún evidencia de un producto que cumpla todos los requisitos del sustituto dérmico ideal. Son necesarios estudios multicéntricos pros¬pectivos que comparen los existentes para determinar sus ventajas y desventajas

BACKGROUND AND OBJECTIVE: Burn units in Colombia, as in the rest of the world, have been a need to provide temporary and definitive skin coverage to burn patients. Our aim is to get a brief review about the history of skin coverage, the creation of skin banks, mainly in Latinamerica and Colombia, their importance and their future. METHODS: We conduct a bibliographic review of skin coverings, creation and current existence of tissue banks in the world and sent a survey to get knowledge about the theme to the directors of Latinamerican laminar tissue banks. RESULTS: Need of skin coverage for trauma injuries has always existed, with different autologous and heterologous alternatives. With the emergence of infectious diseases such as AIDS, the need to offer quality and safe tissues was born, and this triggered the creation of tissue banks that produced the transitory biological dressings. Increase in the survival of patients with extensive and deep burns created the challenge of offering definitive coverage to reduce the scars and sequels of the burned patient. So far, there is no evidence pointing out which are the best alternatives. CONCLUSIONS: Tissue banks continue to be valid due to the usefulness of their transient biological products and permanent dermal substitutes that are constantly improving. There is no evidence yet of a product fulfilling all requirements and tissue banks research is still a work in progress. Multicenter studies are required to compare existing ones in order to determine the advantages and disadvantages of each new developed tissue

Induced Pluripotent Stem Cells: The Most Versatile Source for Stem Cell Therapy.

Cell therapy has existed since the first bone marrow transplant in the 1950s involving identical twins. The blood-forming stem cells were used to restore healthy blood cells for the twin with leukemia. It was not until 1968 that genetic matching (known as human leukocyte antigen matching) was known to be important, and not until 1973 that bone marrow transplants were performed from non-twin-related and nonrelated donors. The most important application of human stem cells is for the generation of cells and tissues for cell-based therapies. Currently, donated organs and tissues are often the only option to replace diseased, injured, or destroyed tissue. The availability for these transplantable tissues and organs is very limited, however. To satisfy the demand for a source for these cells and tissues, induced pluripotent stem cells that have been differentiated into specific cell types can serve as a renewable source of replacement cells and tissues. A bank of suitable human leukocyte antigen-matched cells will be an important source providing immediate availability of cells that are readily scalable, economical, and well characterized. Areas of active pursuit with stem cell therapy is being investigated for treating diseases such as macular degeneration, spinal cord injury, stroke, burns, heart disease, diabetes, osteoarthritis, rheumatoid arthritis, and neurodegenerative diseases. This article describes the advantages and hurdles for the use of induced pluripotent cells as the starting material for a source of replacement cells for regenerative medicine.

The emergence and pitfalls of international tissue banking.

The rapid growth of tissue banking and associated international organisations following the fall of the Berlin wall in 1991 is described. This surge in collaboration led to a world-wide constructive movement to use and to produce human tissues. As the years progressed industrialisation, led by the USA, improved the quality of tissue allografts but led higher costs and consolidation within the developing industry. The growth of litigation more than kept pace with the industrial progress. One landmark case is described, the outcome of which could revolutionise the current practices now applied to eliminate possible viral contamination of implanted tissue grafts.

The New York Brain Bank of Columbia University: practical highlights of 35 years of experience.

The New York Brain Bank processes brains and organs of clinically well-characterized patients with age-related neurodegenerative diseases, and for comparison, from individuals without neurologic or psychiatric impairments. The donors, either patients or individuals, were evaluated at healthcare facilities of the Columbia University of New York. Each source brain yields four categories of samples: fresh frozen blocks and crushed parenchyma, and formalin-fixed wet blocks and histology sections. A source brain is thoroughly evaluated to determine qualitatively and quantitatively any changes it might harbor using conventional neuropathologic techniques. The clinical and pathologic diagnoses are integrated to determine the distributive diagnosis assigned to the samples obtained from a source brain. The gradual standardization of the protocol was developed in 1981 in response to the evolving requirements of basic investigations on neurodegeneration. The methods assimilate long-standing experience from multiple centers. The resulting and current protocol includes a constant central core applied to all brains with conditional flexibility around it. The New York Brain Bank is an integral part of the department of pathology, where the expertise, teaching duties, and hardware are shared. Since details of the protocols are available online, this chapter focuses on practical issues in professionalizing brain banking.

Professor Glyn O. Phillip's legacy within the IAEA programme on radiation and tissue banking.

Professor Phillips began his involvement in the implementation of this important IAEA programme, insisting that there were advantages to be gained by using the ionizing radiation technique to sterilize human and animal tissues, based on the IAEA experience gained in the sterilization of medical products. The outcome of the implementation of the IAEA programme on radiation and tissue banking demonstrated that Professor Phillips was right in his opinion.

Tissue banking, biovigilance and the notify library.

This issue is dedicated to the contributions of Professor Glyn O. Phillips to the field of tissue banking and the advancement of science in general. The use of ionizing radiation to sterilize medical products drew the interest of the International Atomic Energy Agency (IAEA). A meeting in 1976 in Athens Greece to present work on the effects of sterilizing radiation doses upon the antigenic properties of proteins and biologic tissues was my first introduction of Professor Phillips and the role that he was to play in Tissue Banking (Friedlaender, in Phillips GO, Tallentine AN (eds) Radiation sterilization. Irradiated tissues and their potential clinical use. The North E. Wales Institute, Clwyd, p 128, 1978). The IAEA sponsored subsequent meetings in the Republic of Korea, Czechoslovakia and Rangoon, the later including a visit to the tissue bank by Professor Phillips. His advocacy resulted in multiple workshops and teaching opportunities in a variety of countries, one of which led to the establishment of the Asia Pacific Surgical Tissue Banking Association in 1989 (Phillips and Strong, in Phillips GO, Strong DM, von Versen R, Nather A (eds) Advances in tissue banking, vol 3. World Scientific, Singapore, pp 403-417, 1999).

Peripheral T cell lymphomas with follicular T helper phenotype: a new basket or a distinct entity? Revising Karl Lennert's personal archive.

AIMS: To revise 25 cases selected from Karl Lennert's personal archive (21) and Bologna and Frankfurt Registries (four) because of cytological similarities. METHODS AND RESULTS: All cases were provided with paraffin blocks and studied by immunohistochemistry and molecular techniques. While phenotyping was very informative, among molecular studies only EBER in situ-hybridization (ISH) was successful. Twenty-two cases were concluded as peripheral T cell lymphomas (PTCL). Of these, six were reclassified as angioimmunoblastic T cell lymphoma (AITL), 13 as PTCL, not otherwise specified (NOS), including four follicular variants and one tumour with T-zone pattern, and three as borderline tumours between AITL and PTCL/NOS. All these cases consisted homogeneously of small/medium-sized elements with mild nuclear atypia and an evident rim of clear/pale cytoplasm. On immunohistochemistry, they regularly expressed three to six follicular helper T cell (FTH)-associated markers. EBER-ISH revealed scattered EBV-infected B cells in all tumours except those with 'follicular' growth pattern. The content of follicular dendritic cells and high-endothelial venules varied significantly depending on the histotype. CONCLUSIONS: This study shows that: (i) historical material can be still employed usefully, and (ii) the FTH-phenotype corresponds to a broad spectrum of PTCLs that might form a new category to be validated in future molecular and clinicopathological analyses.

[The Tissue Bank of the University Hospital Erasme]. / La Banque de Tissus de l'Hôpital Universitaire Erasme.

The evolution of the Tissue Bank belonging to the University Hospital Erasme is summarized during its 13 years of experience. In parallel with this evolution, the important modifications of the legislation, the selection criteria and the bone graft processing are reported. The significant improvement of the safety of the allograft related to the risk of infection is also mentioned. In constant progression, the ongoing research within the BTE studies the osteogenic activity of the graft, mostly of bone demineralized matrix.

Neuropathology of epilepsy and psychosis: the contributions of J.A.N. Corsellis.

Professor J.A.N. Corsellis, whose life and work is recalled here, gained great insight into the meaning of morphological cerebral aberrations found in neuropsychiatric disease through exact neuropathological investigations of tissue specimens obtained from patients with distinct syndromes. He was a leading authority in the field. We have searched and compiled resources relating to J.A.N. Corsellis' life and work, including personal memories from colleagues and data from scientific publications. J.A.N. Corsellis made seminal contributions to the understanding of neuropsychiatric disease; his works substantially added to the understanding of the dementias, schizophrenia and the psychoses, and morphological sequelae of boxing. In seizure disorders, his name is linked to the first description of focal cortical dysplasia and limbic encephalitis, the pathology of status epilepticus and Ammon's horn sclerosis, and the systematic investigation of epilepsy surgery specimens in general. Both his life and work are closely linked to Runwell Hospital, Wickford, Essex and the Maudsley Hospital. During his professional life he established a large brain bank, now known as the Corsellis Collection. J.A.N. Corsellis had significant impact on neuroscience; many of his observations were groundbreaking and are still valid.

Retrospective access to data: the ENGAGE consent experience.

The rapid emergence of large-scale genetic databases raises issues at the nexus of medical law and ethics, as well as the need, at both national and international levels, for an appropriate and effective framework for their governance. This is even more so for retrospective access to data for secondary uses, wherein the original consent did not foresee such use. The first part of this paper provides a brief historical overview of the ethical and legal frameworks governing consent issues in biobanking generally, before turning to the secondary use of retrospective data in epidemiological biobanks. Such use raises particularly complex issues when (1) the original consent provided is restricted; (2) the minor research subject reaches legal age; (3) the research subject dies; or (4) samples and data were obtained during medical care. Our analysis demonstrates the inconclusive, and even contradictory, nature of guidelines and confirms the current lack of compatible regulations. The second part of this paper uses the European Network for Genetic and Genomic Epidemiology (ENGAGE Consortium) as a case study to illustrate the challenges of research using previously collected data sets in Europe. Our study of 52 ENGAGE consent forms and information documents shows that a broad range of mechanisms were developed to enable secondary use of the data that are part of the ENGAGE Consortium.

Dendritic spines and development: towards a unifying model of spinogenesis--a present day review of Cajal's histological slides and drawings.

Dendritic spines receive the majority of excitatory connections in the central nervous system, and, thus, they are key structures in the regulation of neural activity. Hence, the cellular and molecular mechanisms underlying their generation and plasticity, both during development and in adulthood, are a matter of fundamental and practical interest. Indeed, a better understanding of these mechanisms should provide clues to the development of novel clinical therapies. Here, we present original results obtained from high-quality images of Cajal's histological preparations, stored at the Cajal Museum (Instituto Cajal, CSIC), obtained using extended focus imaging, three-dimensional reconstruction, and rendering. Based on the data available in the literature regarding the formation of dendritic spines during development and our results, we propose a unifying model for dendritic spine development.