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The upregulation of metallothionein-1 expression in areca quid chewing-associated oral squamous cell carcinomas.

Abstract：

:Metallothioneins (MTs) are a family of low molecular weight, cysteine-rich, inducible, intracellular proteins that bind heavy metals with high affinity. MT-1 is known as a stress-inducible protein and functions as an antioxidant enzyme. Areca quid chewing is a major risk factor in the development and further progression of oral squamous cell carcinoma (OSCC). The aim of this study was to compare MT-1 expression in normal human oral epithelium and OSCC and further explore the potential mechanism that may lead to induce MT-1 expression. Thirty four OSCC and 10 normal epithelium specimens were examined by immunohistochemistry and analyzed by the clinico-pathological profiles. The oral epithelial cell line GMN cells were challenged with arecoline, a major areca nut alkaloid, by reverse-transcriptase polymerase chain reaction. Furthermore, tobacco smoke carcinogen benzo[a]pyrene (BaP) and glutathione (GSH) precursor N-acetyl-l-cysteine (NAC) were added to find the possible regulatory mechanisms. The results from immunohistochemistry demonstrated that MT-1 expression was significantly higher in OSCC specimens (p<0.05). No significant difference in MT-1 expression was observed with respect to age, sex, T category, and stage (p>0.05). The high MT-1 expression was associated with lymph node metastasis (p=0.012). In addition, arecoline was found to elevate MT-1 mRNA in a dose-dependent manner (p<0.05). Furthermore, the addition of BaP enhanced the arecoline-induced MT-1 expression (p<0.05). The addition of NAC markedly inhibited the arecoline-induced MT-1 expression (p<0.05). These results lead to the conclusion that MT-1 expression is significantly upregulated in areca quid chewing associated-OSCC. The expression profile suggests MT-1 could be used clinically as a marker for tumors possessing the potential for lymph node metastasis. The compounds of tobacco products may act synergistically in the pathogenesis of OSCC in areca quid chewers. The regulation of MT-1 expression induced by arecoline is critically dependent on the intracellular GSH concentration.

journal_name

Oral Oncol

journal_title

Oral oncology

authors

Lee SS,Yang SF,Ho YC,Tsai CH,Chang YC

doi

10.1016/j.oraloncology.2007.01.019

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

180-6

issue

2

eissn

1368-8375

issn

1879-0593

pii

S1368-8375(07)00055-3

journal_volume

44

pub_type

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