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| Author(s): |
Danilo Marchete Damas Souza
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Biologia |
| Defense date: | 2013-08-27 |
| Examining board members: |
Hernandes Faustino de Carvalho;
Eduardo Rochete Ropelle;
Willian Fernando Zambuzzi;
Vanessa Morais Freitas;
Leonardo Oliveira Reis
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| Advisor: | Hernandes Faustino de Carvalho |
| Abstract | |
The growth and physiology of the prostate is dependent on steroid receptors in certain types of cells and the paracrine interactions established after the initial response to these hormones in combination with somatotropic hormones such as insulin. The current work aims to characterize the molecular components related to the adaptation mechanisms of the epithelial cells in the prostate of rats. In addition to the absence of androgen and/or insulin and possible connections with the general pathways regulating cell metabolism, monitoring different points of the signaling pathways that integrate TSC1- TSC2 and mTORC1 and mTORC2. 54 male Wistar rats aged between 75 and 105 days were used for the current work. Diabetes was induced by intraperitoneal injection of alloxan and the rats were divided into non-diabetic (ND), diabetic (DIA) and diabetic treated with insulin (INS) groups. Every group was divided into three sub groups and the rats were sacrificed non castrated, surgically castrated 48 and 72 hours. Using Western blotting the contents and phosphorylation of mTOR, p70S6K, eIF4B, 4E- BP, eIF4E and p53 were analyzed. The results obtained in this study identify a clear function of androgenic stimulation in the negative regulation of eIF4E (by 4E-BP1) and positive regulation eIF4B and p53. It also became clear that insulin positively regulates the phosphorylation of 4E-BP1. In conclusion two mechanisms seem to be essential for the maintenance and selection of prostatic epithelial cells in rats: (I) p53/4E-BP/eIF4E in the absence of androgen, (II ) p70S6K/eIF4B in the absence of insulin. Financial support: CNPq , CAPES / DS and FAPESP (AU) | |
| FAPESP's process: | 09/05051-7 - Signaling pathways involved with epithelial cell death in response to androgen deprivation and in the insulin-induced survival |
| Grantee: | Danilo Marchete Damas de Souza |
| Support Opportunities: | Scholarships in Brazil - Doctorate |