Navegando por Palavras-chave "Adult stem cells"
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- ItemAcesso aberto (Open Access)Células-tronco derivadas de tecido adiposo humano: desafios atuais e perspectivas clínicas(Sociedade Brasileira de Dermatologia, 2010-10-01) Yarak, Samira [UNIFESP]; Okamoto, Oswaldo Keith [UNIFESP]; Universidade Federal do Vale do São Francisco; Universidade Federal de São Paulo (UNIFESP)Adult or somatic stem cells hold great promise for tissue regeneration. Currently, one major scientific interest is focused on the basic biology and clinical application of mesenchymal stem cells. Adipose tissue-derived stem cells share similar characteristics with bone marrow mesenchymal stem cells, but have some advantages including harvesting through a less invasive surgical procedure. Moreover, adipose tissue-derived stem cells have the potential to differentiate into cells of mesodermal origin, such as adipocytes, cartilage, bone, and skeletal muscle, as well as cells of non-mesodermal lineage, such as hepatocytes, pancreatic endocrine cells, neurons, cardiomyocytes, and vascular endothelial cells. There are, however, inconsistencies in the scientific literature regarding methods for harvesting adipose tissue and for isolating, characterizing and handling adipose tissue-derived stem cells. Future clinical applications of adipose tissue-derived stem cells rely on more defined and widespread methods for obtaining cells of clinical grade quality. In this review, current methods in adipose tissue-derived stem cell research are discussed with emphasis on strategies designed for future applications in regenerative medicine and possible challenges along the way.
- ItemAcesso aberto (Open Access)Criopreservação de tecido adiposo humano : caracterização de fração estromal vascular, células-tronco derivadas de tecido adiposo e enxerto de gordura(Universidade Federal de São Paulo (UNIFESP), 2017-08-01) Fortoul, Fabiana Cristina Zanata [UNIFESP]; Ferreira, Lydia Masako [UNIFESP]; Gimble, Jeffrey; http://lattes.cnpq.br/1619822351741819 ; http://lattes.cnpq.br/9159640209869596 ; Universidade Federal de São Paulo (UNIFESP)Introdução: Tecido adiposo é importante fonte de células-tronco mesenquimais, denotando um aspecto funcional, além do estrutural. A criopreservação é uma opção para a utilização de tecido armazenado, evitando efeitos adversos de coleta, facilitando a utilização imediata ou repetida. Objetivo: Analisar a criopreservação do tecido adiposo humano com caracterização de fração estromal vascular/células-tronco derivadas de tecido adiposo e enxerto de gordura. Métodos: Tecido adiposo de oito doadores foi processado por digestão enzimática, fresco ou após criopreservação com DMSO por quatro semanas. Fração estromal vascular de tecido fresco, células criopreservadas e células de tecido criopreservado foram caracterizadas por produção, viabilidade, proliferação e expansão em cultura, diferenciação e imunofenotipagem. Enxertos de tecido adiposo fresco e criopreservado em camundongos C57BL/6GFP foram analisados nove semanas após transferência no subcutâneo de camundongos por meio de histologia e imuno-histoquímica. Resultados: A criopreservação de tecido adiposo manteve rendimento e viabilidade celular, capacidade de diferenciação adipogênica e osteogênica, aumento da expressão dos marcadores celulares estromais e adipogênicos e redução dos marcadores hematopoiéticos. Enxertos de gordura mostraram aspectos morfológicos e estruturais semelhantes por quantificação de infiltrado celular (H&E) e de fibrose (tricrômio de Masson), presença de células positivas para PVF em áreas periféricas, adipócitos funcionais evidenciados por perilipina e positividade para CD31 evidenciando vascularização, sugerindo um comportamento de suporte estrutural do tecido enxertado no receptor imunocompetente, tanto para tecido fresco como criopreservado. Conclusões: O tecido adiposo humano criopreservado mantém rendimento, e viabilidade celular, aumenta marcadores celulares de superfície precursores estromais de células da FEV, mantém características das CTTAH in vitro e do enxerto de gordura in vivo.
- ItemAcesso aberto (Open Access)Hemoderivados como suplemento no meio de cultivo para células-tronco dentárias humanas(Universidade Federal de São Paulo (UNIFESP), 2011-07-27) Pisciolaro, Ricardo Luiz [UNIFESP]; Duailibi, Silvio Eduardo [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Introduction: One among many aims of medicine is to overcome injuries inflicted to the organism by diseases, aging and trauma, re-establishing the usual functions. About tissues losses, several authors claim that the ideal replacement is the healthy tissue itself, originated from the same source or developed by Tissue Engineering (TE). However, much research is needed before in vivo application. Objective: To evaluate three different kinds of sera supplies used in stem cell culture media, as to cellular proliferation and cellular injuries on dental stem cell. Methods: Five experiments were made utilizing incompletely developed third molar teeth. After enzymatic digestion, the adult stem cells were cultivated in four different kinds of culture media. Medium I, serum free (SF); medium II, supplied with FBS (heterologous serum- HeS); medium III, supplied with homologous human serum (homologous serum- HoS) and medium IV, supplied with autologous human serum (autologous serum . AuHS).These cultures were analyzed comparatively as to cellular proliferation; they were submitted Von Kossa (VK) and Alizarin Red (AR) markers tests for four weeks (checked weekly), and each two weeks checked for Colonies Forming Unities (CFUs). On the 28th day, all four cultures were submitted to comet assay, and were inspected for possible cellular DNA injuries. The results underwent a non-parametric statistical Friedman fs variance test, with significance (p) . 5%. Results: Culture medium IV reached a cellular proliferation rate higher than medium I, showing a significant result (p*=0,0074). Culture medium II presented a superior proliferation result than medium I, and similar to medium III, although neither of them presented significant result when compared to medium IV. The comet assay fs results showed minor cellular DNA injury in the medium IV cultures, when compared to medium II and III cultures. The CFUs were numerous in the media IV and III cultures, respectively, and there was higher mineralization rate in the medium IV than in the media II and III. Conclusion: The culture medium supplied with AuHS significantly improved cellular proliferation. Human sera proved to be a viable supply to human dental stem cell culture.