| RRC ID |
43367
|
| 著者 |
Izutsu N, Maesawa C, Shibazaki M, Oikawa H, Shoji T, Sugiyama T, Masuda T.
|
| タイトル |
Epigenetic modification is involved in aberrant expression of class III beta-tubulin, TUBB3, in ovarian cancer cells.
|
| ジャーナル |
Int J Oncol
|
| Abstract |
Aberrant expression of class III beta-tubulin, TUBB3, has been reported to be one of the important mechanisms responsible for taxane resistance in diverse human malignancies. We investigated aberrant TUBB3 expression and its epigenetic modification in 66 primary tumors and 3 cell lines (OVCAR-3, JHOC-5 and JHOC-8) of ovarian cancers. Overexpression of TUBB3 protein was observed in 56 (85%) of the 66 ovarian cancers, and was significantly associated with aggressive tumor behavior (advanced stage, presence of ascites, suboptimal cytoreduction at surgery and presence of lymph node metastasis) (P<0.05). Responses to treatment with a demethylating agent (5-aza-2'-deoxycytidine, 5-Aza-CdR) and a histone deacetylase inhibitor (4-phenylbutyric acid, PBA) differed among the ovarian cancer cell lines. In 2 cell lines with weak expression of TUBB3 protein (OVCAR-3 and JHOC-8), TUBB3 induction was independently induced by treatment with 5-Aza-CdR (JHOC-8) or PBA (OVCAR-3), while neither agent markedly altered TUBB3 mRNA/protein expression in a strongly TUBB3-expressing cell line (JHOC-5). A CpG island within intron 1 was hypermethylated in 1 cell line (JHOC-8) that expressed TUBB3 weakly and required 5-Aza-CdR treatment for gene expression. A CpG island of another cell line showing faint expression of TUBB3 protein (OVCAR-3), in which a significant gain of TUBB3 expression was induced by treatment with PBA but not with 5-Aza-CdR, was hypomethylated, similarly to a cell line (JHOC-5) showing constitutive expression of TUBB3. We evaluated methylation status in this region in 14 primary tumors using methylation-specific PCR, but there was no significant relationship with TUBB3 immunoreactivity. These findings suggest that aberrant expression of TUBB3 protein might be associated with aggressive behavior of ovarian cancers, and that epigenetic modulation (DNA methylation and chromatin acetylation) might be partly involved in TUBB3 expression.
|
| 巻・号 |
32(6)
|
| ページ |
1227-35
|
| 公開日 |
2008-6-1
|
| DOI |
10.3892/ijo_32_6_1227
|
| PMID |
18497984
|
| MeSH |
Azacitidine / pharmacology
CpG Islands
Cystadenocarcinoma, Serous / genetics
Cystadenocarcinoma, Serous / metabolism
Cystadenocarcinoma, Serous / pathology
Epigenesis, Genetic*
Female
Gene Expression Regulation, Neoplastic*
Humans
Immunoenzyme Techniques
Ovarian Neoplasms / genetics*
Ovarian Neoplasms / metabolism
Ovarian Neoplasms / pathology
Polymerase Chain Reaction
Promoter Regions, Genetic / genetics
RNA, Messenger / genetics
RNA, Messenger / metabolism
Tubulin / genetics*
Tubulin / metabolism
Tumor Cells, Cultured
|
| IF |
3.899
|
| 引用数 |
42
|
|
WOS 分野
|
ONCOLOGY
|
| リソース情報 |
| ヒト・動物細胞 |
JHOC-5(RCB1520)
JHOC-8(RCB1723) |
