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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2014.tde-11122014-140024
Document
Author
Full name
Juliano Zequini Polidoro
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2014
Supervisor
Committee
Reboucas, Nancy Amaral (President)
Girardi, Adriana Castello Costa
Onuchic, Luiz Fernando
Title in Portuguese
O papel de ATRAP (AT1R associated protein) na modulação de NHE3 mediada por angiotensina II.
Keywords in Portuguese
ATRAP
Contra-transportador NHE3
Regulação molecular de transportadores iônicos
Sistema renina-angiotensina
Túbulo proximal
Abstract in Portuguese
Os experimentos indicam, como já demonstrado em estudos prévios do laboratório, que angiotensina II (Ang II) apresenta efeito estimulatório sobre a cinética de recuperação de pHi em células OKP. Tal estímulo não é acentuado pela super-expressão de AT1aR recombinante, ao contrário do que imaginávamos inicialmente. Acreditamos que, por conta da capacidade de amplificação de sinal característica dos receptores acoplados a proteína G, um aumento de expressão do receptor AT1aR em relação ao nível endógeno seja redundante para o fenômeno biológico estudado. Por outro lado, os resultados para o grupo com super-expressão de ATRAP corroboram nossa hipótese inicial, ao indicar uma atenuação do efeito de Ang II sobre a recuperação de pHi, em comparação aos demais grupos experimentais tratados com Ang II. Considerando que a recuperação de pHi em células OKP reflete essencialmente a atividade de troca Na+/H+ mediada pelo contra-transportador NHE3, podemos concluir que a regulação positiva de NHE3 via AT1aR/AngII é prejudicada pelo aumento de expressão da proteína ATRAP.
Title in English
ATRAP (AT1R associated protein) role on modulation of angiotensin II-mediated NHE3 activity.
Keywords in English
ATRAP
Molecular regulation of ion transportes
NHE3 antiporter
Proximal tubule
Renin-angiotensin system
Abstract in English
The experimental data suggests that, as shown in previous works from our laboratory, angiotensin II (Ang II) raises the pHi recovery rate in OKP cells. This upregulation is not enhanced by recombinant AT1aR overexpression, contrary to our initial hypothesis. We believe that, due to signal amplification mediated by G-protein coupled receptors, any increase in AT1aR would be redundant considering the biological phenomenon of interest. On the other hand, results from the ATRAP overexpression group supports our initial hypothesis, pointing an attenuated effect of Ang II over pHi recovery in relation to the remaining groups treated with Ang II. Considering that pHi recovery in OKP cells primarily reflects the Na+/H+ exchange activity mediated by NHE3 antiporter, we can conclude that NHE3 upregulation mediated by AT1aR/AngII is impaired by an increase in ATRAP protein expression.
 
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Publishing Date
2014-12-16
 
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