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Increased expression of CENP-H gene in human oral squamous cell carcinomas harboring high-proliferative activity
Hideo Shigeishi1, Koichiro Higashikawa, Shigehiro Ono
1Division of Cervico-Gnathostomatology, Department of Oral and Maxillofacial Surgery, Graduate School of Biomedical Sciences, Hiroshima University, Kasumi, Hiroshima 734-855, Japan. shige@hiroshima-u.ac.jp
Abstract:
We examined the expression of Centromere protein H (CENP-H) mRNA in 38 oral squamous cell carcinomas (SCCs), 2 epithelial dysplasias and 5 normal gingivae using the real-time quantitative reverse transcription-polymerase chain reaction (RT-PCR). The mean expression level of CENP-H mRNA was higher in oral SCCs (0.11+/-0.08) than epithelial dysplasias (0.03+/-0.01) and normal gingivae (0.027+/-0.01). The expression level of CENP-H mRNA was significantly higher in oral SCCs than normal gingivae (Mann-Whitney U test, P=0.005). We also found a significant association between the level of CENP-H mRNA expression and clinical stage in oral SCCs (Mann-Whitney U test, P=0.04). We next studied the expression of CENP-H in 17 oral SCCs immunohistochemically. A significant correlation between the expression levels of CENP-H protein and the Ki-67 labeling index was found (Mann-Whitney U test, P=0.005). These results indicate that human CENP-H is closely linked to the increased or abnormal cell proliferation in malignant conditions.
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