Characterization of intracellular superoxide dismutase alterations in premalignant and malignant lesions of the oral cavity: correlation with lymph node metastasis.
J Cancer Res Clin Oncol 2009;
135:1625-33. [PMID:
19521720 DOI:
10.1007/s00432-009-0610-8]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2009] [Accepted: 05/25/2009] [Indexed: 01/29/2023]
Abstract
PURPOSE
The purpose of this study was to characterize changes in the expression of copper-zinc superoxide dismutase (Cu/Zn-SOD) and manganese SOD (Mn-SOD) in oral squamous-cell carcinoma (OSCC).
METHODS
Real-time quantitative reverse transcriptase-polymerase chain reaction analysis of Cu/Zn-SOD and Mn-SOD mRNA expression was carried out in 50 pairs of OSCC tissue specimens and corresponding normal tissues. Mn-SOD protein expression was evaluated further in 65 OSCC tissue samples and 33 oral premalignant lesions (OPLs) using immunohistochemistry.
RESULTS
Significant (P < 0.001) upregulation of Mn-SOD mRNA expression was observed in OSCC tissues compared with the normal tissue counterparts, whereas no significant difference was detected in Cu/Zn-SOD expression. Significant increases in Mn-SOD protein expression were seen in both OPLs (P < 0.001) and OSCC tissue (P < 0.001) together with a high incidence of lymph node metastasis (P = 0.04).
CONCLUSIONS
Our findings suggested that Mn-SOD overexpression is a frequent and early event during oral carcinogenesis and could contribute to aggressive OSCC.
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