E-cadherin mutation and Snail overexpression as alternative mechanisms of E-cadherin inactivation in synovial sarcoma

Tsuyoshi Saito, Yoshinao Oda, Kenichi Kawaguchi, Keishi Sugimachi, Hidetaka Yamamoto, Naomi Tateishi, Kazuhiro Tanaka, Shuichi Matsuda, Yukihide Iwamoto, Marc Ladanyi, Masazumi Tsuneyoshi

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Abstract

We have recently reported frequent E-cadherin gene mutations in synovial sarcoma (SS), suggesting mutational inactivation of E-cadherin as a potential mechanism of spindle cell morphology in SS, a spindle cell sarcoma that shows areas of glandular epithelial differentiaton in some cases (biphasic SS) and only pure spindle cell morphology in most cases (monophasic SS). However, the mechanism of downregulation of E-cadherin in SS remains unknown. To further address this issue, we analysed the mechanisms of E-cadherin silencing in 40 SS. Genetic and epigenetic changes in the E-cadherin gene, and the expression level of its transcriptional represser Snail were examined by polymerase chain reaction-single-strand conformation polymorphism (PCR-SSCP), methylation-specific PCR, and real-time quantitative PCR, respectively. Expression of E-cadherin was examined by RT-PCR and immunohistochemistry. We also examined ELF3, a transcription factor associated with epithelial differentiation in SS in a previous cDNA microarray, by RT-PCR. E-cadherin and ELF3 transcripts were detected, respectively, in 27/40 (67.5%) and in 25/40 (62.5%) of SS, and these epithelial-related genes were almost always coexpressed. Hypermethylation of the promoter of the E-cadherin gene was detected in five cases (12.5%) in SS; however, E-cadherin was silenced at mRNA level in only one of the five cases. E-cadherin missense mutations were observed in five cases (12.5%) of SS. In SS, all five cases with E-cadherin missense mutations had the SYT-SSX1 fusion and were monophasic tumors, suggesting a relationship between the SYT-SSX fusion type and E-cadherin missense mutation (P = 0.07). E-cadherin mRNA expression in SS was associated with reduced Snail expression level (P = O-OS). E-cadherin membranous expression was observed in 14/40 (35.0%) of SS, and was also correlated with SYT-SSX1 fusion type and biphasic histology. ELF3 was confirmed to be more highly expressed in biphasic than monophasic SS by real-time quantitative PCR. These results suggest that in SS the loss of E-cadherin expression occurs either by Snail trans-repression or by inactivating mutations. Thus, E-cadherin downregulation is associated with the loss or absence of glandular epithelial differentiation in certain SS.

Original languageEnglish
Pages (from-to)8629-8638
Number of pages10
JournalOncogene
Volume23
Issue number53
DOIs
Publication statusPublished - Nov 11 2004

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Synovial Sarcoma
Snails
Cadherins
Mutation
Missense Mutation
Polymerase Chain Reaction
Real-Time Polymerase Chain Reaction
Down-Regulation
Genes
Messenger RNA

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics
  • Cancer Research

Cite this

E-cadherin mutation and Snail overexpression as alternative mechanisms of E-cadherin inactivation in synovial sarcoma. / Saito, Tsuyoshi; Oda, Yoshinao; Kawaguchi, Kenichi; Sugimachi, Keishi; Yamamoto, Hidetaka; Tateishi, Naomi; Tanaka, Kazuhiro; Matsuda, Shuichi; Iwamoto, Yukihide; Ladanyi, Marc; Tsuneyoshi, Masazumi.

In: Oncogene, Vol. 23, No. 53, 11.11.2004, p. 8629-8638.

Research output: Contribution to journalArticle

Saito, T, Oda, Y, Kawaguchi, K, Sugimachi, K, Yamamoto, H, Tateishi, N, Tanaka, K, Matsuda, S, Iwamoto, Y, Ladanyi, M & Tsuneyoshi, M 2004, 'E-cadherin mutation and Snail overexpression as alternative mechanisms of E-cadherin inactivation in synovial sarcoma', Oncogene, vol. 23, no. 53, pp. 8629-8638. https://doi.org/10.1038/sj.onc.1207960
Saito, Tsuyoshi ; Oda, Yoshinao ; Kawaguchi, Kenichi ; Sugimachi, Keishi ; Yamamoto, Hidetaka ; Tateishi, Naomi ; Tanaka, Kazuhiro ; Matsuda, Shuichi ; Iwamoto, Yukihide ; Ladanyi, Marc ; Tsuneyoshi, Masazumi. / E-cadherin mutation and Snail overexpression as alternative mechanisms of E-cadherin inactivation in synovial sarcoma. In: Oncogene. 2004 ; Vol. 23, No. 53. pp. 8629-8638.
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AU - Yamamoto, Hidetaka

AU - Tateishi, Naomi

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