Nr4a3, a possibile oncogenic factor for neuroblastoma associated with CpGi methylation within the third exon

Uekusa,Shota; Kawashima,Hiroyuki; Sugito,Kiminobu; Yoshizawa,Shinsuke; Shinojima,Yui; Igarashi,Jun; Ghosh,Srimoyee; Wang,Xaofei; Fujiwara,Kyoko; Ikeda,Taro; Koshinaga,Tsugumichi; Soma,Masayoshi; Nagase,Hiroki

doi:10.3892/ijo.2014.2340

Nr4a3, a possibile oncogenic factor for neuroblastoma associated with CpGi methylation within the third exon

Authors:
- Shota Uekusa
- Hiroyuki Kawashima
- Kiminobu Sugito
- Shinsuke Yoshizawa
- Yui Shinojima
- Jun Igarashi
- Srimoyee Ghosh
- Xaofei Wang
- Kyoko Fujiwara
- Taro Ikeda
- Tsugumichi Koshinaga
- Masayoshi Soma
- Hiroki Nagase
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Affiliations: Department of Pediatric Surgery, School of Medicine, Nihon University, Tokyo, Japan, Department of Cancer Genetics, School of Medicine, Nihon University, Tokyo, Japan, Department of Zoology, North‑Eastern Hill University, Meghalaya, India, Innovative Therapy Research Group, Nihon University Research Institute of Medical Science, Nihon University School of Medicine, Tokyo, Japan
Published online on: March 13, 2014 https://doi.org/10.3892/ijo.2014.2340
Pages: 1669-1677

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Abstract

Aberrant methylation of Nr4a3 exon 3 CpG island (CpGi) was initially identified during multistep mouse skin carcinogenesis. Nr4a3 is also known as a critical gene for neuronal development. Thus, we examined the Nr4a3 exon 3 CpGi methylation in mouse brain tissues from 15-day embryos, newborns and 12-week-old adults and found significant increase of its methylation and Nr4a3 expression during mouse brain development after birth. In addition, homologous region in human genome was frequently and aberrantly methylated in neuroblastoma specimens. A quantitative analysis of DNA methylation revealed that hypomethylation of CpG islands on Nr4a3 exon 3, but not on exon 1 was identified in three neuroblastomas compared with matched adrenal glands. Additional analysis for 20 neuroblastoma patients was performed and 8 of 20 showed hypomethylation of the CpGi on Nr4a3 exon 3. The survival rate of those 8 patients was significantly lower compared with those in patients with hypermethylation. Immunohistochemical Nr4a3 expression was generally faint in neuroblastoma tissues compared with normal tissues. Moreover, the MYCN amplified NB9 cell line showed hypomethylation and low expression of Nr4a3, while the non-MYCN amplified NB69 cell line showed hypermethylation and high expression. These results indicate that DNA hypomethylation of the CpGi at Nr4a3 exon 3 is associated with low Nr4a3 expression, and correlates with poor prognosis of neuroblastoma. Since Nr4a3 upregulation associated with the hypermethylation and neuronal differentiation in mice, poor prognosis of neuroblastoma associated with Nr4a3 low expression may be partly explained by dysregulation of its differentiation.

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