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Master's Dissertation
DOI
10.11606/D.10.2016.tde-07102016-120231
Document
Author
Full name
Bruna Andrade Aguiar
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Miglino, Maria Angélica (President)
Nishiyama, Ana Claudia Oliveira Carreira
Portal, Maria Josefina Illera Del
Title in Portuguese
Obtenção e caracterização de células derivadas do pâncreas fetal canino
Keywords in Portuguese
Cão
Células beta-pancreáticas
Diabetes mellitus
Terapia celular
Abstract in Portuguese
A Diabetes mellitus em cães é cada vez mais frequente, decorrente de fatores genéticos e/ou ambientais, como um distúrbio endócrino que, de forma semelhante à que ocorre em humanos, falha no controle adequado de glicose no sangue, desencadeia a hiperglicemia, glicosúria e perda de peso. A terapia celular utilizando as células beta-pancreáticas tem sido alvo de estudos, devido à grande demanda de novos casos de Diabetes mellitus e à falta de órgãos para transplantes em humanos e animais. Acredita-se que a ciência possa responder e inovar em tratamentos, encontrando a possível cura para esta doença complexa. Portanto, o objetivo deste estudo foi obter e caracterizar células derivadas do pâncreas fetal canino de animais com idades compreendidas entre 50 e 60 dias de gestação. As células pancreáticas de fetos caninos apresentam morfologia fibroblastóide e crescimento em monocamada em cultivo, apresentam células pluripotentes e proliferativas, não são tumorigênicas e apresentam expressão de PDX1, um fator de transcrição que tem papel importante na ativação do gene promotor da insulina. O pâncreas possui inervação simpática, observado por fibras nervosas TH+. Histologicamente, o pâncreas fetal canino apresenta ácinos num estágio de organização avançado, com parênquima semelhante ao encontrado no cão adulto. As ilhotas pancreáticas são distribuídas no tecido de maneira irregular, organizando-se em pequenos aglomerados de células por entre os ácinos, especialmente próximas aos vasos sanguíneos. A coloração com Ditizona permitiu inferir a presença de insulina no tecido pancreático, o que foi comprovado mediante técnica de imunofluorescência, além da presença de células que expressam o hormônio somatostatina. Os resultados desta investigação indicam que o pâncreas fetal canino demonstra características favoráveis para ser uma fonte viável de células para estudos aplicados à terapia celular em cães. Outras investigações referentes à comprovação da produção de insulina in vitro por essas células se fazem necessárias
Title in English
Obtention and characterization of derivated cells from canine fetal pancreas
Keywords in English
Cell therapy
Diabetes mellitus
Dog
Pancreatic beta cells
Abstract in English
Diabetes mellitus in dogs is increasingly common, due to genetic and/or environmental factors such as an endocrine disorder, similarly to what occurs in humans, failure to adequately control blood glucose triggers hyperglycemia, glycosuria and weight loss. Cell therapy using the pancreatic beta cells has been the subject of studies, due to the great demand of new cases of diabetes mellitus and the lack of organs for transplants in humans and animals. It is believed that science can respond and innovate treatments, finding a possible cure for this disease complex. Therefore, the objective of this study was to obtain and characterize derived cells from canine fetal pancreas, of animals aged between 50 and 60 days of gestation. The pancreatic cells of canine fetuses exhibit fibroblastoid morphology and growth in monolayer culture, exhibit pluripotent and proliferative cells, are not tumorigenic and have PDX1 expression, a transcription factor that plays an important role in the activation of the insulin gene promoter. The pancreas has sympathetic innervation observed by TH+ nerve fibers. Histologically, the fetal pancreatic acini canine presents an advanced stage organization with similar parenchyma that found in adult dog. The pancreatic islets are distributed in the fabric unevenly, organizing themselves into small clusters of cells through the acini, especially close to the blood vessels. Staining with Dithizone allowed inferring the presence of insulin in the tissue, which was confirmed by immunofluorescence, in addition to cells that express somatostatin. The results of this investigation indicate that the canine fetal pancreas shows favorable characteristics to be a feasible source of cells for cell therapy applied to studies in dogs. Further investigation regarding the evidence of in vitro production of insulin by these cells are required
 
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Publishing Date
2016-10-10
 
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