Inflammatory events during murine squamous cell carcinoma development

Journal of Inflammation

Research

João Santana da Silva¹  Claudia Ramos Pinheiro²  Ana Paula Campanelli²  Luisa Thomazini de Freitas²  Gustavo Pompermaier Garlet²  Rodrigo Nalio Ramos²  André Luis da Silva²  Thais Helena Gasparoto²  Carine Ervolino de Oliveira³ 

[1] Department of Biochemistry and Immunology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil;Department of Biological Sciences - Microbiology and Immunology, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil;Department of Biological Sciences - Microbiology and Immunology, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil;Department of Stomatology - Oral Pathology, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil;

关键词: Elastase;    Nitric oxide;    Myeloperoxidase;    Inflammatory cells;    Cytokines;   

DOI  :  10.1186/1476-9255-9-46

 received in 2012-03-12, accepted in 2012-11-06,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundSquamous cell carcinoma (SCC) is one of the most common human cancers worldwide. In SCC, tumour development is accompanied by an immune response that leads to massive tumour infiltration by inflammatory cells, and consequently, local and systemic production of cytokines, chemokines and other mediators. Studies in both humans and animal models indicate that imbalances in these inflammatory mediators are associated with cancer development.MethodsWe used a multistage model of SCC to examine the involvement of elastase (ELA), myeloperoxidase (MPO), nitric oxide (NO), cytokines (IL-6, IL-10, IL-13, IL-17, TGF-β and TNF-α), and neutrophils and macrophages in tumour development. ELA and MPO activity and NO, IL-10, IL −17, TNF-α and TGF-β levels were increased in the precancerous microenvironment.ResultsELA and MPO activity and NO, IL-10, IL −17, TNF-α and TGF-β levels were increased in the precancerous microenvironment. Significantly higher levels of IL-6 and lower levels of IL-10 were detected at 4 weeks following 7,12-Dimethylbenz(a)anthracene (DMBA) treatment. Similar levels of IL-13 were detected in the precancerous microenvironment compared with control tissue. We identified significant increases in the number of GR-1+ neutrophils and F4/80+/GR-1- infiltrating cells in tissues at 4 and 8 weeks following treatment and a higher percentage of tumour-associated macrophages (TAM) expressing both GR-1 and F4/80, an activated phenotype, at 16 weeks. We found a significant correlation between levels of IL-10, IL-17, ELA, and activated TAMs and the lesions. Additionally, neutrophil infiltrate was positively correlated with MPO and NO levels in the lesions.ConclusionOur results indicate an imbalance of inflammatory mediators in precancerous SCC caused by neutrophils and macrophages and culminating in pro-tumour local tissue alterations.

【 授权许可】

Unknown   
© Gasparoto et al.; licensee BioMed Central Ltd. 2012. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.