Promoter methylation of cyclin D2 gene in gastric carcinoma

  • Authors:
    • Yasuhiro Oshimo
    • Hirofumi Nakayama
    • Reiko Ito
    • Yasuhiko Kitadai
    • Kazuhiro Yoshida
    • Kazuaki Chayama
    • Wataru Yasui
  • View Affiliations

  • Published online on: December 1, 2003     https://doi.org/10.3892/ijo.23.6.1663
  • Pages: 1663-1670
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Abstract

Methylation of CpG island in the promoter has been recognized as an important mechanism for regulation of gene expression. Although considerable work has been done on the epigenetic control of tumor suppressor genes, little is known about the potential role of promoter CpG demethylation in the activation of oncogenes. The cyclin D2 gene is overexpressed in a subset of gastric carcinoma. To determine whether hypomethylation of cyclin D2 is involved in stomach carcinogenesis, we studied methylation of CpG islands in the cyclin D2 gene by methylation-specific PCR in 34 gastric carcinoma specimens, 21 corresponding non-neoplastic mucosae, and 8 gastric carcinoma cell lines. We also measured levels of cyclin D2 mRNA in 23 of the gastric carcinoma cases and in the gastric carcinoma cell lines. Hypomethylation of the cyclin D2 promoter was found in 24 (71%) of the 34 tumor tissues and in 6 (29%) of the 21 corresponding non-neoplastic mucosa, the incidence being significantly different (p=0.002; Fisher's exact test). Moreover, hypomethylation of cyclin D2 was more common in stage III and IV tumors than in stage I and II tumors (p=00.014; Fisher's exact test). All of three cell lines with promoter hypomethylation expressed detectable levels of cyclin D2 mRNA. Treatment of cyclin D2-negative cells lines harboring promoter hypermethylation with demethylating agent, 5-Aza-2'-deoxycytidine, led to a reactivation of cyclin D2 expression. These results suggest that DNA hypomethylation is a mechanism underlying the increased expression of cyclin D2 in cancer cells and that demethylation of cyclin D2 may be involved in development and progression of gastric carcinoma.

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December 2003
Volume 23 Issue 6

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Oshimo Y, Nakayama H, Ito R, Kitadai Y, Yoshida K, Chayama K and Yasui W: Promoter methylation of cyclin D2 gene in gastric carcinoma. Int J Oncol 23: 1663-1670, 2003.
APA
Oshimo, Y., Nakayama, H., Ito, R., Kitadai, Y., Yoshida, K., Chayama, K., & Yasui, W. (2003). Promoter methylation of cyclin D2 gene in gastric carcinoma. International Journal of Oncology, 23, 1663-1670. https://doi.org/10.3892/ijo.23.6.1663
MLA
Oshimo, Y., Nakayama, H., Ito, R., Kitadai, Y., Yoshida, K., Chayama, K., Yasui, W."Promoter methylation of cyclin D2 gene in gastric carcinoma". International Journal of Oncology 23.6 (2003): 1663-1670.
Chicago
Oshimo, Y., Nakayama, H., Ito, R., Kitadai, Y., Yoshida, K., Chayama, K., Yasui, W."Promoter methylation of cyclin D2 gene in gastric carcinoma". International Journal of Oncology 23, no. 6 (2003): 1663-1670. https://doi.org/10.3892/ijo.23.6.1663