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| Author(s): |
Fernando Forato Anhê
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Ciências Biomédicas (ICB/SDI) |
| Defense date: | 2010-06-14 |
| Examining board members: |
Silvana Auxiliadora Bordin da Silva;
Antonio Carlos Boschero;
Luciana Chagas Caperuto
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| Advisor: | Silvana Auxiliadora Bordin da Silva |
| Abstract | |
BMPs play a determinant role in cell differentiation and growth. BMP intracellular signaling involves the substrates know as BR-SMADs (SMAD1/5/8). BMPR1A receptor expression was upregulated in pancreatic islets from pregnant rats, in wich endocrine mass and insulin secretion are increased. Mice with attenuated BMPR1A signaling in <font face=\"Symbol\">b cells showed decreased expression of key genes involved in insulin exocytosis. These events are associated with reduction of BR-SMADs activity. The aim of this work was to perform a screening to evaluate changes in expression profiles after knockdown of BR-SMADs in INS1E <font face=\"Symbol\">b cells. Relative expressions of Munc18a, Munc18b and Snap23 were diminished after knockdown of the BRSMADs (n=3, p<0,05 vs CTL). Only SMAD1 (n=3, p<0,05 vs CTL) and SMAD5 (n=3, p<0,05 vs CTL) silencing caused reduction of sintaxin 4 expression. These data point to the involvement of BR-SMADs in the regulation of insulin secretion by modulating the expression of proteins responsible by fusion of insulin-containing granules to the membrane of INS1E cells. (AU) | |