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Proteomic analysis of Epithelial to Mesenchymal Transition in Breast Cancer Promoted by Overexpresison of Transcription Factors.

Grant number: 12/09682-4
Support type:Scholarships in Brazil - Master
Effective date (Start): August 01, 2012
Effective date (End): July 31, 2014
Field of knowledge:Biological Sciences - Biochemistry - Chemistry of Macromolecules
Principal Investigator:Vitor Marcel Faça
Grantee:Camila de Souza Palma
Home Institution: Faculdade de Medicina de Ribeirão Preto (FMRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
Associated research grant:11/09740-1 - Identification and validation of metastasis-related molecular signatures -In-Depth and targeted proteomic analysis of epithelial-mesenchymal transition in adenocarcinomas, AP.JP


Breast cancer kills over 450 thousand people worldwide every year, and its metastasis is responsible for most of the deaths. Therefore, the most effective methods to decrease cancer morbidity and mortality consist in early detection, prevention and treatment of metastasis. Epithelial to mesenchymal transition (EMT) is a process that naturally occurs during embryogenesis and tissue repair and is also involved in cancer progression and metastasis. EMT induces complex cellular and microenviromental changes, such as decrease in cell-cell contact, resulting in loss of epithelial phenotype and acquisition of mesenchymal properties, which in turn promotes invasive and migratory capabilities to these cells. EMT can be triggered by several factors such as extracellular matrix components and growth factors, including TGF-², HGF e PDGF. Besides, overexpression of some transcription factors such as ZEB1, ZEB2, TWIST1, GSC, SNAIL, SLUG, FOXC1 and FOXC2 also induces EMT in vitro. Here, we aim to broaden the understanding of the complex molecular mechanisms of EMT modulated at the protein level, and for that we propose a detailed proteomic analysis of the breast adenocarcinoma cell lineage MDA-MB-231, induced to EMT by ZEB1 or TWIST1 overexpression. The protein components of the membrane, nucleus and cytoplasm will be quantitatively analyzed using the stable isotopic labeling of cells in culture (SILAC) method, fractionation of intact proteins and high-resolution mass spectrometry coupled with liquid chromatography (LC-MS/MS). With this detailed analysis we intend to identify proteins that are important to breast cancer progression and metastasis and that can possibly serve as targets for metastasis inhibition and/or disease diagnostics.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GRASSI, MARIANA LOPES; PALMA, CAMILA DE SOUZA; THOME, CAROLINA HASSIBE; LANFREDI, GUILHERME PAUPERIO; POERSCH, ALINE; FACA, VITOR MARCEL. Proteomic analysis of ovarian cancer cells during epithelial-mesenchymal transition (EMT) induced by epidermal growth factor (EGF) reveals mechanisms of cell cycle control. JOURNAL OF PROTEOMICS, v. 151, n. SI, p. 2-11, JAN 16 2017. Web of Science Citations: 16.

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