Inhibition of p16 tumor suppressor gene expression via promoter hypermethylation in canine lymphoid tumor cells |
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Authors: | Aki Fujiwara-Igarashi Yuko Goto-KoshinoHiroyuki Mochizuki Masahiko SatoYasuhito Fujino Koichi OhnoHajime Tsujimoto |
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Institution: | Department of Veterinary Internal Medicine, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan |
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Abstract: | To investigate the epigenetic regulation of the p16 gene in canine lymphoid tumor cells, its methylation status was examined in four canine lymphoid tumor cell lines. In three canine lymphoid tumor cell lines (CLBL-1, GL-1, and UL-1) with low-level p16 mRNA expression, 20 CpG sites in the promoter region of p16 gene were consistently methylated although all of the CpG sites were not methylated in another cell line (CL-1) and normal lymph node cells. The expression level of p16 mRNA in these three cell lines was restored after cultivation in the presence of a methylation inhibitor, 5-Aza-2′-deoxycitidine, indicating inactivation of p16 gene via hypermethylation. This study revealed the inactivation of p16 gene through hypermethylation of its CpG island in a fraction of canine lymphoid tumor cells. |
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Keywords: | Dog Hypermethylation Lymphoma p16 Tumor suppressor gene |
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