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KMID : 0829220090330030129
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Korean Journal of Oral and Maxillofacial Pathology
2009 Volume.33 No. 3 p.129 ~ p.138
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Expression of Eukaryotic Translation Initiation Factor-5A in Oral Carcinogenesis
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Lee Sang-Im
Lee Jun
Lee Sun-Kyung
Bae Won-Jung
Kim Sun-Ju
Kim Young-Il
Chio In-Suk
lee Seung-Hoon
Lee Sang-Kwang
Lee Hwa-Jun
Park Jae-Sang
Kim Eun-Cheol
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Abstract
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Eukaryotic translation initiation factor 5A (eIF-5A) is essential for proliferation of eukaryotic cells, andwas identified as diagnotic marker in cervical intraepithelial neoplasia, cervical and endometrial cancer, but relatively little is known about thein vivo and in vitro expression patterns of eIF-5A in oral premalignant and malignant lesions mirror the expression levels observed in vitro with cells derived from normal oral mucosa, immortalized oral keratinocytes (IHOK) and primary and metastatic oral squamous cell carcinoma (OSCC). We used an oral squamous cell carcinoma (OSCC) progression model composed of cell lines and tissue specimens to characterize expression patterns by Western blotting and immunohistochemistry. eIF-5A and PCNA levels are elevated in IHOKand primary and metastatic OSCC cella as compatred to normal human oral keraitinocytes. eIF5A and PCNA expression was limited to basal cells of normal oral mucosa. eIF-5A and PCNA expression is increased in dysplastic epithelium spreading to more superficial layers, and its expression levels correlated significantly with the degree of dysplasia. Well and moderately differentiated OSCC showed strong expression of eIF-5A and PCNA. These results suggest that upregulated expression of eIF-5A seems to be an important epigenetic alteration that accompanies oral carcinogenic progression, and eIF-5A could be used as an biomarker for oral premalignat lesion or squamous cell carcinoma.
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KEYWORD
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Oral cancer, Immortalized keratinocytes, Precancerous lesion, EIF-5A, Cancer marker
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