Abstract:
:Oxidative stress results in damage to cellular structures and has been linked to numerous diseases, including cancer. Extracellular superoxide dismutase (EC-SOD) is a principal enzymatic antioxidant in extracellular space. The purpose of this study was to determine whether the expression of EC-SOD protein is altered in the carcinogenetic process of oral squamous-cell carcinoma (OSCC). Immunohistochemical analysis was carried out in matched normal and tumour specimens collected from 58 OSCCs and 20 oral premalignant lesions (OPLs). Correlations between the EC-SOD expression levels and clinicopathological features of OSCC patients were evaluated by Fisher's exact test. Although EC-SOD protein was consistently expressed on the plasma membrane of cells in normal tissues, plasma membranous EC-SOD expression was lost in almost all the OSCC specimens examined (98%). Instead, positive EC-SOD expression was detected in the cytoplasmic compartments of cancerous cells in both OPLs (65%) and OSCCs (52%), together with a high incidence of lymph node metastasis (p=0.0397). These results suggest that the dysregulation of EC-SOD protein expression is a frequently occuring and early event in oral carcinogenesis, and that cytoplasmic EC-SOD may contribute to the increased aggressiveness of OSCC.
journal_name
Exp Ther Medjournal_title
Experimental and therapeutic medicineauthors
Yokoe H,Nomura H,Yamano Y,Fushimi K,Sakamoto Y,Ogawara K,Shiiba M,Bukawa H,Uzawa K,Takiguchi Y,Tanzawa Hdoi
10.3892/etm_00000092subject
Has Abstractpub_date
2010-07-01 00:00:00pages
585-590issue
4eissn
1792-0981issn
1792-1015pii
etm-01-04-0585journal_volume
1pub_type
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