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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2019.tde-13012021-103739
Document
Author
Full name
Thais de Assis Ribas
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2019
Supervisor
Committee
Sogayar, Mari Cleide (President)
Forti, Fábio Luís
Molina, Erika de Simone
Nogueira, Adriano Barreto
Title in Portuguese
Análise do papel do gene supressor de tumor RECK durante a diferenciação neurogênica
Keywords in Portuguese
Diferenciação neuronal
promotor
protocolos de diferenciação
Reck
teratocarcinoma
Abstract in Portuguese
O gene supressor de tumor Reck (REversion-inducing Cysteine-rich protein with Kazal motifs) codifica uma glicoproteína multifuncional que inibe a atividade de diversas metaloproteinases de matriz (MMPs), como também modula a atividade de Notch e vias de Wnt canônico. Células neuroprogenitoras com Reck deficiente sofrem uma diferenciação precoce, entretanto, a modulação da expressão de Reck durante a progressão da diferenciação neuronal ainda precisa ser caracterizada. No presente estudo, nós verificamos a assinatura da expressão de Reck e caracterizamos a atividade do promotor de Reck murino durante o processo de diferenciação neural. Foi possível verificar um aumento na atividade e níveis de expressão do promotor de Reck em três modelos de diferenciação celular: PC12 feocromocitoma, P19 teratocarcinoma derivado de embrião e USP-4 célula tronco embrionária de murinos, que foram submetidas a indução da neurodiferenciação. Além disso, a superexpressão de Reck antes do início da diferenciação celular leva a uma diminuição na eficiência do processo de neurodiferenciação. Levando em conta os dois dados obtidos, eles sugerem que em oposição ao aumento gradual de Reck durante a diferenciação neuronal, a superexpressão nos estágios mais precoces de diferenciação dificulta as células progenitoras a se comprometerem com o destino para células neuronais. Nossos dados reforçam o potencial do uso da modulação da expressão de Reck para otimização dos protocolos de diferenciação in vitro.
Title in English
Evaluation of Reck tumor supressor gene`s role in neuronal differentiation.
Keywords in English
differentiation protocols
Neuronal differentiation
promotor
Reck
teratocarcinoma
Abstract in English
Reck (REversion-inducing Cysteine-rich protein with Kazal motifs) tumor suppressor gene encodes a multifunctional glycoprotein that inhibits the activity of several matrix metalloproteinases (MMPs) and is also able to modulate the Notch and canonical Wnt pathways. Reck-deficient neuroprogenitor cells undergo precocious differentiation; however, modulation of Reck expression during progression of neuronal differentiation process is yet to be characterized. In the present study, we assessed the Reck expression signature and characterized the mouse Reck promoter activity during the in vitro neural differentiation process. We found increased Reck promoter activity and expression levels in three different cellular models, namely: PC12 pheochromocitoma, P19 embryo-derived teratocarcinoma and USP-4 murine embryonic stem cells, upon subjection to neurodifferentiation induction. Moreover, Reck overexpression prior to the beginning of the differentiation protocol leads to diminished efficiency of the neurodifferentiation process. Taken together, our findings suggest that in opposition to the gradual increase of Reck expression during the neuronal differentiation process, its overexpression at early stages of the process hinders the progenitor cells commitment to a neuronal fate. Our data reinforces the potential use of Reck expression modulation to optimize in vitro neurodifferentiation protocols.
 
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Publishing Date
2021-11-09
 
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