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The Korean Journal of Pathology 2009;43(2): 107-112.
doi: https://doi.org/10.4132/KoreanJPathol.2009.43.2.107
The Overexpression of Histone Deacetylase 1 and Its Relationship with p16INK4a Gene Hypermethylation in Pulmonary Squamous Cell Carcinoma and Adenocarcinoma.
Jong Hyeok Park, Young Seoub Hong, Phil Jo Choi, Na Young Kim, Kyung Eun Lee, Mee Sook Roh
1Department of Pathology, Dong-A University College of Medicine, Busan, Korea. msroh@dau.ac.kr
2Department of Preventive Medicine, Dong-A University College of Medicine, Busan, Korea.
3Department of Thoracic and Cardiovascular Surgery, Dong-A University College of Medicine, Busan, Korea.
4Medical Research Center for Cancer Molecular Therapy, Dong-A University College of Medicine, Busan, Korea.
BACKGROUND: DNA methylation and histone modification are dynamically linked in the epigenetic control of gene silencing and they play an important role in tumorigenesis. METHODS: To evaluate the role of histone deacetylase 1 (HDAC1) in the development of lung cancer and the relationship between a HDAC1 overexpression and p16INK4a hypermethylation, we performed immunohistochemical staining for HDAC1 in 76 lung cancer specimens (39 squamous cell carcinomas and 37 adenocarcinomas) that had been previously evaluated for their p16INK4a methylation status by real-time quantitative polymerase chain reaction. RESULTS: A HDAC1 overexpression (>50% of HDAC1 immunoreactive cells) was detected in 65 (85.5%) out of the 76 cases and it was more frequently seen in the squamous cell carcinomas (97.4%) than in the adenocarcinomas (73.0%) (p=0.002). The incidence of HDAC1 overexpression tended to be higher in the heavy smokers with more than 20 pack-years (p=0.067). Although there was no statistical significance, the frequency of p16INK4a hypermethylation in the cases with a HDAC1 overexpression (27.7%) tended to be higher than that in the cases without a HDAC1 overexpression (9.0%) (p=0.175). CONCLUSIONS: A HDAC1 overexpression might be involved in lung carcinogenesis, and especially in a subgroup of smoking and squamous cell carcinoma patients, and a HDAC1 overexpression may be associated with p16INK4a hypermethylation.
Key Words: Lung; Squamous cell carcinoma; HDAC1 protein, human; Cyclin-dependent kinase inhibitor p16; Hypermethylation