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1.
Rev. bras. ortop ; 57(5): 788-794, Sept.-Oct. 2022. graf
Article in English | LILACS | ID: biblio-1407691

ABSTRACT

Abstract Objective Histological and macroscopic evaluation of the healing process of acute lesions of the femoral rectus muscle using stem cells derived from adipose tissue-derived stem cells (ADSCs). Method An experimental study was conducted with 18 hind legs of New Zealand rabbits, which were divided into three study groups according to the intervention to be performed. In group I, no surgical procedure was performed; in group II—SHAN, the experimental lesion was performed without any additional intervention protocol; in group III—Intervention, the addition of ADSCs was performed in the same topography of the experimental lesion. After the proposed period, 2 weeks, the material was collected and submitted to macroscopic and histological evaluation. Results The quantitative analysis showed that the addition of ADSCs is related to the reduction of inflammatory cells in the 2-week evaluation (164.2 cells in group II - SHAN to 89.62 cells in group III - ADSC). The qualitative analysis of the slides with Picrosirius red, noticed an increase in orange/yellow fibers in group III - ADSC, which evidences a final healing process. The macroscopic evaluation found no difference between the groups. Conclusion The use of ADSCs in the treatment of acute muscle injury presented histological advantages when compared to their non-use.


Resumo Objetivo Avaliação histológica e macroscópica do processo de cicatrização das lesões agudas do músculo reto femoral, com utilização de células-tronco derivadas de tecido adiposo (ADSCs, na sigla em inglês). Método Foi realizado um estudo experimental com 18 patas traseiras de coelhos Nova Zelândia, que foram divididos em três nos grupos de estudo de acordo com a intervenção a ser realizada. No grupo I não foi realizado procedimento cirúrgico; no grupo II - SHAN foi realizado a lesão experimental sem nenhum protocolo de intervenção adicional; e no grupo III - Intervenção foi realizado a adição de ADSCs na mesma topografia onde foi realizada a lesão experimental. Após o período proposto, 2 semanas, o material foi coletado, submetido a avaliação macroscópica e histológica. Resultados A análise quantitativa demonstrou que a adição de ADSCs está relacionada com a diminuição de células inflamatórias na avaliação com 2 semanas (164,2 células no grupo II - SHAN para 89,62 células no grupo III - ADSC). A análise qualitativa das lâminas coradas com Picrosírius red demonstrou um aumento das fibras de cor laranja/amarela no grupo III - ADSC, o que evidencia um processo final de cicatrização. A avaliação macroscópica não encontrou diferença entre os grupos. Conclusão A utilização de ADSCs no tratamento de lesão muscular aguda apresentou vantagens histológicas quando comparada a sua não utilização.


Subject(s)
Animals , Rabbits , Regeneration , Regenerative Medicine , Mesenchymal Stem Cells , Muscles , Muscular Diseases
2.
Frontiers of Medicine ; (4): 358-377, 2022.
Article in English | WPRIM | ID: wpr-939883

ABSTRACT

According to literature, certain microorganism productions mediate biological effects. However, their beneficial characteristics remain unclear. Nowadays, scientists concentrate on obtaining natural materials from live creatures as new sources to produce innovative smart biomaterials for increasing tissue reconstruction in tissue engineering and regenerative medicine. The present review aims to introduce microorganism-derived biological macromolecules, such as pullulan, alginate, dextran, curdlan, and hyaluronic acid, and their available sources for tissue engineering. Growing evidence indicates that these materials can be used as biological material in scaffolds to enhance regeneration in damaged tissues and contribute to cosmetic and dermatological applications. These natural-based materials are attractive in pharmaceutical, regenerative medicine, and biomedical applications. This study provides a detailed overview of natural-based biomaterials, their chemical and physical properties, and new directions for future research and therapeutic applications.


Subject(s)
Biocompatible Materials/chemistry , Humans , Hyaluronic Acid , Regenerative Medicine , Tissue Engineering , Tissue Scaffolds/chemistry
3.
Rev. méd. Minas Gerais ; 32: 32206, 2022.
Article in English, Portuguese | LILACS | ID: biblio-1391109

ABSTRACT

Introdução: O uso de pericárdio bovino teve início em 1972 nas cirurgias cardiovasculares. A partir da evolução da engenharia de tecidos com os cuidados na preparação do material, minimizando os riscos de rejeição e facilitando a utilização para diversos tipos de cirurgias, o pericárdio bovino tornou-se ferramenta importante em procedimentos cirúrgicos reconstrutivos. Objetivos: Nessa casuística, o presente estudo propõe avaliar o atual cenário da utilização do pericárdio bovino em procedimentos cirúrgicos de diversas especialidades e os resultados pósoperatórios encontrados. Métodos: Assim, foi realizada uma revisão sistemática da literatura e a base de dados consultada foi a MEDLINE, utilizando a palavra-chave "bovine pericardium", elencando estudos publicados nos últimos cinco anos em inglês e português, e que não utilizavam outro tipo de "patch". Resultados: Foram selecionados 14 artigos que totalizam 507 pacientes, submetidos a cirurgias em diversas áreas, tais quais, cardiologia, neurologia, vascular, pediatria, urologia e oftalmologia. Conclusão: Depreende-se que o uso de pericárdio bovino como remendo cirúrgico é seguro, tendo em vista que existem poucos casos de rejeição do hospedeiro, além de fácil e rápido de ser manuseado, possuindo benefícios frente a próteses mecânicas. Faz-se relevante, portanto, ampliar o número de estudos sobre o tema, visando o grande potencial que esse tipo de material possui para a medicina regenerativa.


Introduction: The use of bovine pericardium started in 1972 in cardiovascular surgeries. From the evolution of tissue engineering with care in the preparation of the material, minimizing the risk of rejection and facilitating the use for various types of surgeries, the bovine pericardium has become an important tool in reconstructive surgical procedures. Purpose: In this series, the present study proposes to evaluate the current scenario of the use of bovine pericardium in surgical procedures of different specialties, and the postoperative results found. Methods: Thus, a systematic literature review was carried out and the database consulted was MEDLINE, using the keywords "bovine pericardium", listing studies published in the last five years in English and Portuguese and that did not use another type of patch. Results: 14 articles were selected, totaling 507 patients, who underwent surgery in several areas, such as cardiology, neurology, vascular, pediatrics, urology, and ophthalmology. Conclusion: It appears that the use of bovine pericardium as a surgical patch is safe, given that there are few cases of host rejection, in addition to being easy and quick to handle, with benefits compared to mechanical prostheses. It is relevant, therefore, to expand the number of studies on the subject, aiming at the great potential that this type of material has for regenerative medicine.


Subject(s)
Humans , Bioprosthesis , Reconstructive Surgical Procedures , Pericardium , Regenerative Medicine
4.
RECIIS (Online) ; 15(4): 987-1005, out.-dez. 2021. tab, ilus
Article in Portuguese | LILACS | ID: biblio-1344160

ABSTRACT

A cooperação científica internacional tornou-se um fator essencial para que os países emergentes alcancem novos patamares de pesquisa, publicações e financiamento. No contexto de uma discussão analítica sobre a cooperação científica global, foram analisadas as publicações brasileiras indexadas na Web of Science e a coautoria entre pesquisadores locais e estrangeiros, com o objetivo de ilustrar as mudanças ocorridas na medicina regenerativa nas duas últimas décadas. O artigo conclui que, na última década, expandiu-se a coautoria entre autores brasileiros e destes com autores de países desenvolvidos, especialmente com aqueles dos Estados Unidos, mas também, em menor grau, com os de outros países emergentes e da América Latina. Pesquisadores brasileiros também publicaram artigos de impacto global, indicando a qualidade atingida, no país, pela pesquisa científica na área. A análise mostra que a colaboração abriu portas, no âmbito global, para a pesquisa local, mas também que as assimetrias científicas se mantiveram ao longo do tempo.


International scientific cooperation has become a key factor for emerging countries to improve research advancement, publication and funding. An analysis of local publications indexed in the Web of Science and co-authored between Brazilian researchers and non-residents was carried out, in the context of an analytical discussion on global scientific cooperation and with the aim of illustrating changes in the last two decades in regenerative medicine regarding this topic. The article concluded that in the last decade Brazil increased scientific co-authorships significantly domestically and with advanced country authors, especially with American authors, but also to a lesser degree with those of other emerging economies in and beyond Latin American. Local researchers have also published on their own several articles of global impact, revealing the academic quality attained in local sciences related to the area. Collaboration has undoubtedly opened doors for Brazilian regenerative medicine globally, but historical scientific inequalities remain.


La cooperación científica internacional se ha transformado en un factor sustancial para que los países emergentes progresen en investigación, publicación y financiación. Se desarrolló un análisis de publicaciones locales indexadas en la Web of Science y coautorías entre investigadores brasileños y extranjeros en el contexto de una reflexión sobre cooperación científica global y con el fin de ilustrar las modificaciones producidas en la medicina molecular regenerativa durante los dos últimos decenios. El artículo concluye que, en el último decenio, Brasil aumentó significativamente las coautorías domésticas y con autores de países avanzados, especialmente de los Estados Unidos, y en menor medida con aquellos de otras economías emergentes dentro y fuera de América Latina. Los investigadores locales han publicado varios artículos propios de impacto global, lo cual revela la calidad académica lograda, en Brasil, en el área. La colaboración ha abierto puertas en el mundo para la medicina regenerativa brasileña, pero las asimetrías científicas históricas persisten.


Subject(s)
Humans , Brazil , Regenerative Medicine , Scientific and Technical Publications , Authorship and Co-Authorship in Scientific Publications , Technical Cooperation , Empirical Research , Science and Technology Information Networks , Cell- and Tissue-Based Therapy
5.
Rev. cuba. hematol. inmunol. hemoter ; 37(2): e1237, 2021. tab
Article in Spanish | LILACS, CUMED | ID: biblio-1289429

ABSTRACT

Introducción: En el tejido adiposo se han identificado células madre mesenquimales con capacidad autorrenovadora y multipotencial. Mediante digestión enzimática y centrifugado del lipoaspirado se libera una población heterogénea de células denominada fracción vascular estromal, con innumerables potencialidades terapéuticas en el campo de la medicina regenerativa. Objetivo: Actualizar el alcance de las células madre derivadas de tejido adiposo en la terapia regenerativa. Método: Se revisaron 38 artículos entre los años 2000 y 2019 en las bases de datos Scielo, ScienceDirect, Medline y Pubmed. Desarrollo: Las células de la fracción vascular estromal se caracterizan por su capacidad de generar tejido adiposo y vasos sanguíneos, y por la producción de factores de crecimiento que ayudan en la supervivencia de los adipocitos y la formación de una red vascular. El principal mecanismo de acción de las células madre derivadas de tejido adiposo parece deberse a su acción paracrina y a la sinergia con células endoteliales. En el campo de la medicina regenerativa se han utilizado en el tratamiento de cicatrices patológicas y de fibrosis deformantes con impotencia funcional, en las reconstrucciones de secuelas por cáncer y en el cierre precoz de zonas cruentas. Conclusiones: La lipotransferencia es un procedimiento con un mínimo de complicaciones que constituye una de las opciones terapéuticas más empleadas para corregir defectos en los tejidos, debido a que no solo es un medio de relleno, sino que también permite la regeneración y restauración tisular. La presencia de células madre en el tejido adiposo, unido a su accesibilidad, disponibilidad e histocompatibilidad, ha motivado su aplicación cada vez más expandida en la medicina estética, reconstructiva y regenerativa(AU)


Introduction: Mesenchymal stem cells with self-renewing and multipotential capacity have been identified in adipose tissue. By means of enzymatic digestion and centrifugation of the lipoaspirate a heterogeneous population of cells called vascular stromal fraction is released. It has innumerable therapeutic potentialities in the field of regenerative medicine. Objective: To update the scope of stem cells derived from adipose tissue in regenerative therapy. Method: 38 articles published between 2000 and 2019 in the Scielo, ScienceDirect, Medline and Pubmed databases were reviewed. Development: The cells of the vascular stromal fraction are characterized by generating adipose tissue and blood vessels and by the production of growth factors that help in the survival of adipocytes and the formation of a vascular network. The main mechanism of action of stem cells derived from adipose tissue appears to be due to their paracrine action and synergy with endothelial cells. Stem cells derived from adipose tissue have been used in regenerative medicine for the treatment of pathological scars and deforming fibrosis with functional impotence, in the reconstruction of cancer sequelae and in the early closure of bloody areas. Conclusions: Lipotransfer is a procedure with a minimum of complications that constitutes one of the most widely used therapeutic options to correct tissue defects, since it is not only a filling medium, but also allows tissue regeneration and restoration. The presence of stem cells in adipose tissue, together with their accessibility, availability and histocompatibility, has motivated their increasingly widespread application in aesthetic, reconstructive and regenerative medicine(AU)


Subject(s)
Humans , Male , Female , Regeneration , Centrifugation , Adipocytes , Regenerative Medicine , Mesenchymal Stem Cells
6.
Rev. Hosp. Clin. Univ. Chile ; 32(1): 4-16, 2021. tab, ilus, graf
Article in Spanish | LILACS | ID: biblio-1252505

ABSTRACT

Platelet rich plasma (PRP) is used to speed up tissue repair. Despite its widespread use, the therapeutic application of PRP generates controversies in clinical results due to the variability in methods of obtaining the different preparations and differences between the components of different types of PRP, so it's recommended to mention the type of platelet preparation used. In this article, we describe technical and biologics characteristics of our platelet product, and we compare them to different commercial preparations described in order to validate their clinical use. Our results determine that the preparation can be considered a platelet rich plasma with biological activity in vivo and in vitro, which supports its use as a valid therapeutic tool, alternative to products currently available in Regenerative Medicine. (AU)


Subject(s)
Humans , Regenerative Medicine/trends , Platelet-Rich Plasma , Cell- and Tissue-Based Therapy
7.
Article in Chinese | WPRIM | ID: wpr-942196

ABSTRACT

The methylation of cytosine is one of the most fundamental epigenetic modifications in mammalian genomes, and is involved in multiple crucial processes including gene expression, cell differentiation, embryo development and oncogenesis. In the past, DNA methylation was thought to be an irreversible process, which could only be diluted passively through DNA replication. It is now becoming increa-singly obvious that DNA demethylation can be an active process and plays a crucial role in biological processes. Ten eleven translocation (TET) proteins are the key factors modulating DNA demethylation. This family contains three members: TET1, TET2 and TET3. Although three TET proteins have relatively conserved catalytic domains, their roles in organisms are not repeated, and their expression has significant cell/organ specificity. TET1 is mainly expressed in embryonic stem cells, TET2 is mainly expressed in hematopoietic system, and TET3 is widely expressed in cerebellum, cortex and hippocampus. This family catalyzes 5-methylcytosine to 5-hydroxymethylcytosine and other oxidative products, reactivates silenced-gene expression, in turn maintains stem cell pluripotency and regulates lineage specification. With the development of tissue engineering, organ transplantation, autologous tissue transplantation and artificial prosthesis have been widely used in clinical treatment, but these technologies have limitations. Regenerative medicine, which uses stem cells and stem cell related factors for treatment, may provide alternative therapeutic strategies for multiple diseases. Among all kinds of human stem cells, adipose-derived stem cells (ADSCs) are the most prospective stem cell lineage since they have no ethical issues and can be easily obtained with large quantities. To date, ADSCs have been shown to have strong proli-feration capacity, secrete numerous soluble factors and have multipotent differentiation ability. However, the underlying mechanism of the proliferation, secretion, acquired pluripotency, and lineage specific differentiation of ADSCs are still largely unknown. Some studies have explored the role of epigenetic regulation and TET protein in embryonic stem cells, but little is known about its role in ADSCs. By studying the roles of TET proteins and 5-hydroxymethylcytosine in ADSCs, we could provide new theoretical foundation for the clinical application of ADSCs and the stem cell-based therapy. In the future, combined with bioprinting technology, ADSCs may be used in tissue and organ regeneration, plastic surgery reconstruction and other broader fields.


Subject(s)
5-Methylcytosine/analogs & derivatives , Animals , DNA Methylation , DNA-Binding Proteins/genetics , Epigenesis, Genetic , Humans , Mixed Function Oxygenases/metabolism , Prospective Studies , Proto-Oncogene Proteins/metabolism , Regenerative Medicine , Stem Cells/metabolism
8.
Journal of Biomedical Engineering ; (6): 1229-1234, 2021.
Article in Chinese | WPRIM | ID: wpr-921865

ABSTRACT

With the continuous progress of materials science and biology, the significance of biomaterials with dual characteristics of materials science and biology is keeping on increasing. Nowadays, more and more biomaterials are being used in tissue engineering, pharmaceutical engineering and regenerative medicine. In repairing bone defects caused by trauma, tumor invasion, congenital malformation and other factors, a variety of biomaterials have emerged with different characteristics, such as surface charge, surface wettability, surface composition, immune regulation and so on, leading to significant differences in repair effects. This paper mainly discusses the influence of surface charge of biomaterials on bone formation and the methods of introducing surface charge, aiming to promote bone formation by changing the charge distribution on the surface of the biomaterials to serve the clinical treatment better.


Subject(s)
Biocompatible Materials , Osteogenesis , Regenerative Medicine , Tissue Engineering
9.
Chinese Journal of Biotechnology ; (12): 3961-3974, 2021.
Article in Chinese | WPRIM | ID: wpr-921479

ABSTRACT

Novel model systems have provided powerful tools for the research of human biology. Despite of being widely used, the conventional research models could not precisely describe the human physiological phenomenon. Organoids are three-dimensional multicellular aggregates derived from stem cells or organ progenitors that could differentiate and self-organize to recapitulate some specific functionalities and architectures of their in vivo counterpart organs. Organoids can be used to simulate organogenesis because of their human origin. In addition, the genomic stability of organoids could be well maintained during long-term amplification in vitro. Moreover, organoids can be cryopreserved as a live biobank for high-throughput screening. Combinatorial use of organoids with other emerging technologies (e.g. gene editing, organ-on-a-chip and single-cell RNA sequencing) could overcome the bottlenecks of conventional models and provide valuable information for disease modelling, pharmaceutical research, precision medicine and regenerative medicine at the organ level. This review summarizes the classifications, characteristics, current applications, combined use with other technologies and future prospects of organoids.


Subject(s)
Gene Editing , Humans , Models, Biological , Organoids , Regenerative Medicine , Stem Cells
10.
Chinese Journal of Biotechnology ; (12): 3945-3960, 2021.
Article in Chinese | WPRIM | ID: wpr-921478

ABSTRACT

The thymus is a pivotal immune organ of the human body, and it is the place where T cells differentiate and mature. The damage of thymus would easily induce autoimmune diseases and even malignant tumors. For years, researchers have been exploring the process of T cell development and revealing the mechanism of thymic injury and regeneration generally through the monolayer culture system of T cells in vitro. However, the classic monolayer culture system could neither reproduce the unique three-dimensional epithelial reticular structure of the thymus, nor provide the cytokines and growth factors required for the directed differentiation of hematopoietic stem cells into T cells. Thymic organoid technology utilizes cells with stem cell potential to simulate the anatomical structure of the thymus and the signaling pathway mediated by thymic epithelial cells in vitro through three-dimensional culture, which is particularly close to the microenvironment of the thymus in vivo. Thymic organoids show great potential in the study of T cell differentiation and development, thymus-related diseases, reconstruction of immune function, and cell therapy. This paper summarizes the methods for culturing thymic organoids, followed by comparing the advantages and disadvantages of the scaffolds used for culturing. The applications of thymic organoids in the disease model, tumor-targeting therapy, regenerative medicine, and organ transplantation were also discussed, with possible future research directions prospected.


Subject(s)
Cell Differentiation , Epithelial Cells , Hematopoietic Stem Cells , Humans , Organoids , Regenerative Medicine , Thymus Gland
11.
Rev. Fac. Odontol. (B.Aires) ; 36(83): 67-74, 2021. ilus
Article in Spanish | LILACS | ID: biblio-1343747

ABSTRACT

El presente trabajo de investigación tiene como objetivo principal el aislar, expandir y caracterizar inmunofenotípicamente células madre mesenquimales de la pulpa dental humana, según los criterios mínimos propuestos por The International Society for Cellular Therapy (ISCT), como así también establecer la puesta a punto de las técnicas y protocolos de procedimientos para tal fin. Los cultivos fueron permanentemente monitoreados mediante microscopio invertido con contraste de fase y la inmunotipificación fue realizada por citometría de flujo (AU)


Subject(s)
Humans , Male , Female , Tissue Engineering , Dental Pulp , Adult Stem Cells , Mesenchymal Stem Cells , Phenotype , Argentina , Schools, Dental , Cell Culture Techniques , Regenerative Medicine
12.
Article in English | LILACS, BBO | ID: biblio-1155006

ABSTRACT

ABSTRACT Objective: To evaluate the regeneration of mandibular cartilage defect after implantation of human umbilical cord mesenchymal stem cells (hUCMSC) over platelet rich fibrin (PRF) as scaffold. Material and Methods: 20 male Wistar rats were randomly divided into four experimental groups consisting of: a control group featuring untreated mandibular defects (C), experimental groups whose mandibular defects were implanted with hUCMSC (E1), mandibular defects implanted with PRF (E2), mandibular defects implanted with hUCMSC and PRF scaffold (E3). The subjects were sacrificed after six weeks of observation for immunohistochemical examination in order to evaluate the expression of Ki67, Sox9, FGF 18, type 2 collagen, and aggrecan, in addition to histology examination to evaluate chondrocyte number and cartilage thickness. Data was analyzed with univariate analysis (ANOVA). Results: The implantation of hUCMSC and PRF scaffold proved capable of regenerating mandibular cartilage defect through the expression of FGF 18, Sox9, Ki67, chondrosis counts, type 2 collagen, aggrecan, and cartilage thickness. The regeneration were significantly higher in group E3. Conclusion: Human umbilical cord mesenchymal stem cells in platelet rich fibrin scaffold proved capable of regenerating mandibular cartilage defect.


Subject(s)
Animals , Rats , Cartilage , Cord Blood Stem Cell Transplantation , Regenerative Medicine , Mesenchymal Stem Cells/microbiology , Platelet-Rich Fibrin/microbiology , Immunohistochemistry , Intervention Studies , Analysis of Variance , Rats, Wistar , Indonesia/epidemiology
13.
RECIIS (Online) ; 14(4): 942-959, out.-dez. 2020. ilus, tab
Article in Portuguese | LILACS | ID: biblio-1145570

ABSTRACT

A mídia funciona como uma ponte entre a medicina e o público, e impacta como a informação é organizada e apresentada às pessoas. Realizou-se uma análise de conteúdo, quantitativo e qualitativo, dos enquadramentos principais nas matérias sobre medicina regenerativa publicadas pela Folha de São Paulo e O Globo, entre janeiro de 2012 e maio do 2019. A análise mostrou algumas limitações nas informações publicadas: um número bastante escasso de relatos, com poucas matérias sobre controvérsias sociais e regulatórias e matérias de tons otimistas demais sobre os benefícios das terapias celulares. Conclui-se que falta uma contribuição mais sistemática da imprensa à legitimação social e institucional desta área de ponta no país, desenvolvida com recursos públicos e que oferece uma oportunidade imperdível no aumento da consciência em saúde coletiva, assim como, na participação competitiva do Brasil no cenário global.


Mass media works as a bridge between medicine and the public and produces an impact according to how information is organized and presented. A quantitative and qualitative content analysis was developed on the main framings on regenerative medicine found in reports by the newspapers Folha de São Paulo and O Globo between January 2012 and May 2019. The analysis found limitations in the information published: a reduced number of stories, the presence of few articles on social and regulatory controversies and a portrayal of over-optimistic accounts on the benefits of cellular-based therapies. The article concludes that there is a lack of a more systematic contribution of the printed press to the social and institutional legitimation of the local area, one developed with public resources and that offers a valuable opportunity to raise awareness on collective health, as well as, for a competitive inclusion of Brazil at the global level.


Los medios de comunicación masiva funcionan como un puente entre la medicina y el público, e impactan en los públicos según cómo la información sea organizada y presentada. Se realizó un análisis de contenido, cuantitativo y cualitativo, de los encuadramientos principales en los diarios: Folha de S.Paulo y O Globo sobre la medicina regenerativa entre enero de 2012 y mayo de 2019. El análisis demostró las limitaciones de los contenidos: um número bastante escaso de reportajes, pocas noticias sobre debates y controversias sociales y de tono demasiado optimista acerca de los beneficios de las terapias celulares. Se concluye que falta una contribución sistemática de la prensa a la legitimación social e institucional de esta área de punta em el país, desarrollada com recursos públicos y que ofrece una valiosa oportunidad para un aumento de conciencia sobre la salud colectiva y una participación competitiva de Brazil en el escenario global.


Subject(s)
Humans , Communications Media , Regenerative Medicine , Cell- and Tissue-Based Therapy , Socioeconomic Factors , Brazil , Communications Media/classification , Communications Media/statistics & numerical data , Resource Allocation , e-Government
14.
Medicentro (Villa Clara) ; 24(4): 785-804, oct.-dic. 2020.
Article in Spanish | LILACS | ID: biblio-1143246

ABSTRACT

RESUMEN Introducción: los avances científico-técnicos en el campo de la Biología celular y molecular han permitido restaurar y mejorar la función de órganos y tejidos lesionados por ciertas enfermedades y traumatismos. La Ingeniería de tejido se define como el uso de los principios y métodos de la Ingeniería, la Biología y la Bioquímica, los cuales están orientados a la comprensión de la estructura y la función de los tejidos normales y patológicos, y al consecuente desarrollo de sustitutos biológicos para restaurar, mantener o mejorar su función. Objetivo: realizar un acercamiento a algunos aspectos de la Biología celular y molecular vinculada con la Ingeniería tisular ósea. Métodos: se realizó una búsqueda bibliográfica en SciELO Cuba y en Google académico durante el período de 1 de marzo al 28 de abril de 2018. Se evaluaron 134 artículos y el estudio se circunscribió a los 25 artículos que se enfocaban en estas temáticas de manera integral. Conclusiones: se ofreció una visión general de los avances que se han obtenido en la Biología celular y molecular, y en particular a: la aplicación de los factores de crecimiento en la Ingeniería del tejido óseo, así como sus futuras perspectivas. Se concluyó que es fundamental consolidar una base apropiada de conocimientos sobre la Biología celular y molecular y el desarrollo actual de la Ingeniería del tejido óseo.


ABSTRACT Introduction: scientific and technical advances in the field of cellular and molecular biology have allowed restoring and improving the function of organs and tissues injured by certain diseases and trauma. Tissue engineering is defined as the use of the principles and methods of Engineering, Biology and Biochemistry, which are aimed at understanding the structure and function of normal and pathological tissues, and the consequent development of biological substitutes to restore, maintain or improve their function. Objective: to carry out an approach to some aspects of cellular and molecular biology related to bone tissue engineering. Methods: a bibliographic review was carried out in SciELO Cuba and Google Scholar from March 1 to April 28, 2018. A number of 134 articles were evaluated and the study was limited to 25 articles that focused on these topics in an integral way. Conclusions: an overview of the advances that have been obtained in cellular and molecular biology was offered, particularly to the application of growth factors in bone tissue engineering, as well as its future perspectives. We concluded that it is essential to consolidate an appropriate knowledge base on cellular and molecular biology and the current development of bone tissue engineering.


Subject(s)
Tissue Engineering , Intercellular Signaling Peptides and Proteins , Regenerative Medicine , Placenta Growth Factor
15.
Medicina (B.Aires) ; 80(6): 696-702, dic. 2020. graf
Article in Spanish | LILACS | ID: biblio-1250293

ABSTRACT

Resumen La terapia celular y la medicina regenerativa son áreas en gran desarrollo en la investigación biomédica. En la mayoría de los tejidos existen mecanismos de auto-reparación llevados a cabo, principalmente, por células madre o progenitoras residentes con capacidad para diferenciarse y reemplazar a las células dañadas o para secretar factores tróficos que induzcan el proceso regenerativo. Dado que estos mecanismos de reparación no siempre son suficientes, se postula que la terapia celular puede contribuir a la regeneración de los tejidos sometidos a injuria. Las células madre/estromales mesenquimales (MSCs, del inglés Mesenchymal Stem/Stromal Cells) son un tipo de progenitor adulto multipotente, que tienen la capacidad de expandirse in vitro con facilidad cuando son aisladas de su nicho in vivo, migrar selectivamente a los tejidos lesionados, modular y evadir el sistema inmunológico, y secretar factores tróficos que ayudan a la reparación tisular. Asimismo, la fácil manipulación ex vivo permitiría también usarlas como vehículos de genes terapéuticos. Las principales fuentes de obtención son la médula ósea, el tejido adiposo y cordón umbilical. Los numerosos estudios pre-clínicos y clínicos han demostrado que las MSCs parecieran ser seguras tanto para uso autólogo como alogénico. En este trabajo se resumen las propiedades de las MSCs y su potencial terapéutico para una amplia gama de enfermedades, también presentamos los distintos ensayos clínicos avanzados que las posicionan en el ámbito biomédico como una herramienta interesante para la regeneración de tejidos y el tratamiento de enfermedades inflamatorias.


Abstract Cell therapy and regenerative medicine are currently active areas for biomedical research. In most tissues, there are self-repair mechanisms carried out mainly by resident stem cells that can differentiate and replace dead cells or secrete trophic factors that stimulate the regenerative process. These mechanisms often fail in degenerative diseases; thus it is postulated that exogenous cell therapy can contribute to tissue regeneration and repair. Mesenchymal stem cells (MSCs) are multipotent adult stem/progenitor cells, which could be easily expanded in vitro and have the ability to selectively migrate toward injured tissues, evade the immune system recognition, and secrete trophic factors to support tissue repair. Furthermore, MSCs could be engineered for the delivery of therapeutic genes. The main sources for MSCs are bone marrow, adipose tissue, and umbilical cord. A number of pre-clinical and clinical studies have shown that MSCs therapy is safe for both autologous and allogeneic uses. This review summarizes information about the properties of MSCs and their therapeutic potential for a broad spectrum of diseases. We also present here the last data about clinical trials that position the use of MSCs as an interesting tool for tissue regeneration and the treatment of inflammatory diseases.


Subject(s)
Mesenchymal Stem Cell Transplantation , Mesenchymal Stem Cells , Tissue Engineering , Regenerative Medicine
16.
Cienc. tecnol. salud ; 7(3): 442-460, 26 de noviembre 2020. ^c27 cmilus
Article in Spanish | LILACS, LIGCSA, DIGIUSAC | ID: biblio-1141473

ABSTRACT

En las últimas décadas, la terapia de plasma rico en plaquetas (PRP) ha despertado mucha atención en el área de la medicina regenerativa, siendo aplicada a diferentes patologías sistémicas y localizadas. El PRP proporciona diversos factores de crecimiento y proteínas que pueden estimular al proceso de regeneración celular, representa un factor importante para su uso clínico generalizado, en diferentes tejidos en donde el suministro de sangre es lento o limitado y apoya la recuperación, cicatrización, activación biológica de células de defensa, estabilización en la regeneración celular y tisular, teniendo uso clínico en casi todas las especialidades médicas. Esta revisión tiene como objetivo presentar las bases teóricas para la potencial aplicación del PRP y sus factores de crecimiento en tratamientos que buscan una terapia regenerativa por bioestimulación de la aplicación autóloga, en patologías para las cuales aún no existe tratamiento específico. Se revisaron artículos de los últimos 10 años en los buscadores y bases de datos Google Scholar, PubMed y Scopus y se seleccionaron aquellos que pueden ayudar a entender la aplicación de PRP en diversos procesos de regeneración, con miras a utilizarse como un tratamiento alternativo y complementario a pacientes con COVID-19. Se encontró abundante literatura experimental y clínica en el uso de PRP autóloga, en diversos procesos de regeneración, inclusive en neumología e infectología, por lo que amerita comprobar su efecto con protocolos establecidos, en patologías respiratorias severas como apoyo biológico autólogo para activar la respuesta biológica innata de tipo celular.


Platelet-rich plasma (PRP) therapy has generated much attention in recent decades in regenerative medicine, being applied to different systemic and localized pathologies. PRP provides various growth factors and proteins that can stimulate the cell regeneration process. It is an important factor for its clinical use in different tissues where blood supply is slow or limited, and supports the recovery, healing, activation of defense cells, cellular stabilization, and tissue regeneration, having clinical use in almost all medical specialties. Articles from the last 10 years in Google Scholar, PubMed and Scopus were reviewed and selected those that can help to understand the application of PRP in various regeneration processes, with a view to use as an alternative and complementary treatment for patients with Covid-19. It was found that there is abundant experimental and clinical literature on the use of autologous PRP in various regeneration processes, including pneumology and infectious diseases. It worth evaluating its effect in severe respiratory diseases as an autologous biological support to activate the innate cellular response.


Subject(s)
Humans , Therapeutics , Regenerative Medicine , Platelet-Rich Plasma , Pulmonary Medicine , Communicable Diseases , Coronavirus Infections
17.
Int. j. morphol ; 38(5): 1412-1420, oct. 2020. graf
Article in English | LILACS | ID: biblio-1134457

ABSTRACT

SUMMARY: Mesenchymal stem cells are characterized by in vitro high proliferation and multilineage potential maintenance. This study aimed to isolate and characterize equine YS mesenchymal stem cells and compare these with amniotic membranes. The yolk sac (YS) and amniotic membranes (AM) were obtained from 20 pregnant mares with gestational age around 30 days. Cells were cultured in α-MEM supplemented with 15 % FBS, 1 % antibiotic solution, 1 % L-glutamine and 1 % nonessential amino acids. To cell characterization we used cytogenetic analysis, fibroblast colony-forming unit assays, cell growth curves, immunophenotyping, flow cytometry, differentiation assays and teratoma formation. Results: Both cell sources presented fibroblastoid and epithelioid-like format. The YS cells have lower colony formation potential then AM ones, 3 versus 8 colonies per 103 plated cells. However, YS cells grew progressively while AM cells showed steady. Both, the YS and amnion cells immunolabeled for Oct-4, Nanog, SSEA-3, cytokeratin 18, PCNA, and vimentin. In addition, presented mesenchymal, hematopoietic, endothelial and pluripotency markers in flow cytometry. Discussion: Both cell sources presented high plasticity and differed into osteogenic, adipogenic, and chondrogenic lineages, and no tumor formation in nude mice was observed. The results suggest that horse YS may be useful for cell therapy such as amnion-derived cells.


RESUMEN: Las células madre mesenquimales se caracterizan por una alta proliferación in vitro y un mantenimiento potencial de múltiples líneas. Este estudio tuvo como objetivo aislar y caracterizar las células madre mesenquimales del saco vitelino equinas y compararlas con las membranas amnióticas. Se obtuvo el saco vitelino (SV) y las membranas amnióticas (MA) de 20 yeguas preñadas con edad gestacional de aproximadamente 30 días. Las células se cultivaron en α -MEM suplementado con 15 % de FBS, 1 % de solución antibiótica, 1 % de L-glutamina y 1 % de aminoácidos no esenciales. Para la caracterización celular utilizamos análisis citogenéticos, ensayos de unidades de colonias de fibroblastos, curvas de crecimiento celular, inmunofenotipaje, citometría de flujo, ensayos de diferenciación y formación de teratomas. Ambas fuentes celulares presentaron formato fibroblastoideo y epitelioide. Las células SV tienen un potencial de formación de colonias más bajo que las de MA, 3 versus 8 colonias por 103 células en placa. Sin embargo, las células SV crecieron progresivamente mientras que las células MA se mostraron estables. Tanto las células YS como las células amnios están inmunomarcadas para Oct-4, Nanog, SSEA-3, citoqueratina 18, PCNA y vimentina. Además, presentó marcadores mesenquimales, hematopoyéticos, endoteliales y pluripotenciales en citometría de flujo. Ambas fuentes celulares presentaron alta plasticidad y diferían en linajes osteogénicos, adipogénicos y condrogénicos, y no se observó formación de tumores en ratones. Los resultados sugieren que el SV de caballo puede ser útil para la terapia celular, como las células derivadas de amnios.


Subject(s)
Animals , Yolk Sac/cytology , Mesenchymal Stem Cells/cytology , Horses , Yolk Sac/embryology , In Vitro Techniques , Cells, Cultured , Immunophenotyping , Regenerative Medicine , Embryonic Development , Flow Cytometry , Amnion
18.
Rev. cuba. angiol. cir. vasc ; 21(2): e91, mayo.-ago. 2020. tab, fig
Article in Spanish | LILACS, CUMED | ID: biblio-1126380

ABSTRACT

Introducción: La enfermedad arterial oclusiva de miembros inferiores se asocia con un alto índice de amputaciones y riesgo de muerte. Al respecto, la medicina regenerativa ha mostrado resultados satisfactorios. Objetivo: Caracterizar a los pacientes con enfermedad arterial periférica de los miembros inferiores, tratados con células mononucleares autólogas. Métodos: Se realizó una investigación longitudinal prospectiva en el Hospital Universitario "Arnaldo Milián Castro", durante el período desde enero de 2015 hasta diciembre de 2017. De una población de 61 pacientes se seleccionó una muestra de 52 de forma intencional por criterios. Resultados: La edad promedio resultó de 66,9 ± 8,2 años y el 69,2 por ciento representó al sexo masculino. Los principales factores de riesgo vascular fueron el tabaquismo, la hipercolesteronemia y la hipertensión arterial. El nivel de oclusión mostró predominio fémoro poplíteo y el tractus de salida malo constituyó la principal causa de no revascularización. La viabilidad celular fue elevada y se logró cambio significativo en los estadios de Fontaine. El inicio de la mejoría clínica ocurrió entre el primer y el segundo mes en la mayoría de los casos. En una parte de los pacientes se abrieron posibilidades posquirúrgicas y se obtuvo muy buena reperfusión tisular. Conclusiones: El implante de células mononucleares autólogas en pacientes con enfermedad arterial periférica de los miembros inferiores constituye una nueva estrategia de angiogénesis terapéutica muy útil y efectiva, que abre nuevas perspectivas de tratamiento(AU)


Introduction: Low limbs´ arterial occlusive disease is associated with a high rate of amputations and risk of death. Regarding that, regenerative medicine has proven satisfactory results. Objective: To characterize patients with peripheral arterial disease in the low limbs which have been treated with autologous mononuclear cells. Methods: It was carried out a prospective longitudinal research in "Arnaldo Milián Castro" Hospital in the period from January, 2015 to December, 2017. From a population of 61 patients, it was intentionally selected by criteria a sample of 52 individuals. Results: The average age was 66,9 ± 8,2 and 69,2 percent were men. The main vascular risk factors were smoking habit, hypercholesterolemia and arterial hypertension. The level of occlusion showed predominance of femoro-popliteal and the bad output tractus was the main cause of non-revascularization. Cell viability was high and it was achieved a significant change in Fontaine stages. The beginning of a clinical improvement happened between the first and the second month in most of the cases. In some patients were open post-surgical possibilities and it was obtained great tisular reperfusion. Conclusions: The implant of autologous mononuclear cells in patients with peripheral arterial disease of low limbs represents an useful and effective new strategy of therapeutic angiogenesis which opens new treatment perspectives(AU)


Subject(s)
Humans , Middle Aged , Aged , Arterial Occlusive Diseases , Cell Survival , Cells , Lower Extremity , Regenerative Medicine
19.
Rev. cuba. hematol. inmunol. hemoter ; 36(2): e1133, abr.-jun. 2020.
Article in Spanish | LILACS, CUMED | ID: biblio-1149903

ABSTRACT

La terapia celular basada en células mesenquimales/estromales se aplica ampliamente en la medicina moderna, aun cuando no todos los mecanismos de supervivencia y diferenciación están identificados. Sin embargo, hace pocos años se comenzaron a encontrar elementos extracelulares que generan nuevos paradigmas. En el presente trabajo se explican las principales características y funciones atribuidas a los exosomas, nanopartículas constituidas por microvesículas secretadas por las células con efecto en la matriz extracelular, y su repercusión como alternativa hacia una medicina regenerativa libre de células. Estas estructuras participan de forma notoria y crucial en la comunicación intercelular, lo que ha supuesto un cambio en el concepto de las funciones y el papel que desempeñan estas vesículas en los organismos vivos, en particular en la restauración de tejidos dañados y la respuesta inflamatoria e inmunológica. Se comentan algunos ejemplos de la repercusión biotecnológica de los exosomas en empresas y el mercado biofarmaceútico(AU)


Mesenchymal/stromal cell ;based therapy is widely applied in modern medicine, even though not all survival and differentiation mechanisms are identified. However, a few years ago, extracellular elements began to be found that generate new paradigms. The present work explains the main characteristics and functions attributed to exosomes, nanoparticles made up of microvesicles secreted by with an effect on the extracellular matrix, and their impact as an alternative towards cell-free regenerative medicine. These structures participate, notoriously and critically, in intercellular communication, which has led to a change in the concept of the functions and role that these vesicles play within living organisms, particularly in the restoration of damaged tissues and the inflammatory and immunological response. Some examples of the exosomes' biotechnological impact on companies and the biopharmaceutical market are discussed(AU)


Subject(s)
Humans , Male , Female , Regenerative Medicine/methods , Exosomes/physiology , Mesenchymal Stem Cells/physiology
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