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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Phosphoproteome analysis reveals differences in phosphosite profiles between tumorigenic and non-tumorigenic epithelial cells

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Winck, Flavia V. [1] ; Belloni, Marilia [1] ; Pauletti, Bianca A. [1] ; Zanella, Jackeline de Lima [1] ; Domingues, Romenia R. [1] ; Sherman, Nicholas E. [2] ; Paes Leme, Adriana F. [1]
Total Authors: 7
[1] CNPEM, LNBio, Lab Nacl Biociencias, BR-13083970 Campinas, SP - Brazil
[2] Univ Virginia, Sch Med, Charlottesville, VA 22908 - USA
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF PROTEOMICS; v. 96, p. 67-81, JAN 16 2014.
Web of Science Citations: 8

Oral cancer disease represents a significant fraction of all human cancer types and its poor early diagnosis contributes to reduced individual survival rate. The identification of proteins modulated in tumorigenic cells and its post-translational modifications may improve our understanding of tumor development in epithelial cells. We have analyzed the phosphoproteome of tumorigenic (SCC-9) and non-tumorigenic (HaCaT) cell lines using MS-based approach in order to identify phosphopeptides with differing patterns of modifications and/or abundance. Our results revealed the identity of 4,206 protein phosphorylation sites with sixty-two sites showing to be significantly modulated between the two cell lines. The phosphoproteome data showed an overrepresentation of proteins with a possible role in nuclear regulatory functions. Pathway analysis was further performed on the phosphoproteome dataset and differences and commonalities of the functional pathways present in tumorigenic and non-tumorigenic cells were identified. Phosphopeptides that belong to the proteins lamina-associated polypeptide 2 isoform alpha and serine arginine repetitive matrix protein 2 were identified with differential abundance and they appear as promising tumor-related phosphopeptides. These two proteins may be related to the structural alterations generally found in the nucleus of tumorigenic cells. The identification of phosphorylation sites in tumorigenic cells may contribute to disclose novel signaling mechanisms associated with OSCC. Significance Oral Squamous Cell Carcinoma (oscq is an important cancer disease affecting thousands of people worldwide. Many cellular processes related to the development of oral cancer remain unknown; however, the studies performed in vitro with cancer cells have contributed to guide more specific research which may be further performed by using in vivo approaches or clinical samples. To our knowledge, only few studies have been published showing the results of phosphoproteome profiling of squamous cell carcinoma models, and many signaling proteins must be identified and functionally characterized in order to increase the knowledge available about the complexity of the signaling networks responsible for oral cancer development and its progression. Furthermore, our knowledge regarding proteins exclusive or very low abundant in cancer cells remains limited. A better understanding of the differences between signaling pathways present in epithelial cell lines may contribute to reveal the processes underlying the OSCC. (C) 2013 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 09/54067-3 - Acquisition of a mass spectrometer coupled to a liquid chromatography system for increasing the capacity to meet the needs of users and for making new technologies available in the Laboratory of Mass Spectrometry
Grantee:Adriana Franco Paes Leme
Support type: Multi-user Equipment Program
FAPESP's process: 10/19278-0 - Study of regulation of ADAMs in oral cancer
Grantee:Adriana Franco Paes Leme
Support type: Research Grants - Young Investigators Grants