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Study of superoxide dismutase 2 protein in HPV mediated cell transformation

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Author(s):
Gabriela Avila Fernandes Silva
Total Authors: 1
Document type: Master's Dissertation
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Faculdade de Medicina (FM/SBD)
Defense date:
Examining board members:
Lara Termini; Paula Fontes Asprino; Ana Paula Lepique; Bryan Eric Strauss
Advisor: Lara Termini
Abstract

Oxidative stress reflects a redox imbalance in the cell in favor of oxidant species, which may result in DNA damage, mitochondrial dysfunction, protein misfolding and lipid peroxidation, among others. As a result, oxidative stress is thought to contribute to diverse pathologies such as cancer, neurological disorders, atherosclerosis, diabetes and asthma. Persistent infection with high risk human papillomavirus (HPV) types is etiologically associated with cervical cancer, one of the leading causes of cancer related female death worldwide. Moreover, HPV infection is associated with a significant percentage of penile, vulvar, anal and head and neck carcinomas. In cells infected with high-oncogenic risk HPV types the oxidative stress generated by the abnormal keratinocytes metabolism and non-efficient chronic inflammatory response may contribute to the cellular transformation process. Furthermore, expression of E6 and E7 oncoproteins interferes with several DNA repair mechanisms, favoring the accumulation of mutations. Moreover, genomic instability promoted by oxidative stress may favor HPV integration in host cell genome, the main cause of viral persistence and of precursor lesions progression to cancer. The protein superoxide dismutase 2 (SOD2) contributes to cellular homeostasis by catalyzing radical super anion dismutation in oxygen and oxygen peroxide preventing the direct inactivation of biomolecules. In previous studies we observed that SOD2 mRNA upregulation is associated with the resistance to tumor necrosis factor (TNF) antiproliferative effect in HPV-immortalized cells. Besides, we showed the existence of a direct correlation between increased SOD2 protein expression and cervical lesions severity. Finally, we identified SOD2 as an independent predictive marker of inguinal lymph node metastases in patients with penile carcinomas. However, the role of this protein in HPV-associated pathologies has not been investigated in depth. The goal of this study is to determine the involvement of SOD2 in HPV-mediated cell transformation and its value as a predictive marker in pathologies caused by this virus (AU)

FAPESP's process: 15/26327-1 - Study of superoxide dismutase-2 protein in HPV-mediated cell transformation
Grantee:Gabriela Ávila Fernandes Silva
Support type: Scholarships in Brazil - Master