Abstract
Malignant mesothelioma (MM) is a rare disease with a poor prognosis. Pleural mesothelioma, which is the most common type of MM, is considered to be caused by asbestos exposure and is increasing in incidence, with about 15,000 new cases diagnosed worldwide annually. On the other hand, peritoneal mesothelioma is a very rare type of MM; thus, its pathogenesis is even less understood than pleural mesothelioma. Recent research on the pathogenesis of malignant pleural mesothelioma has indicated that both epigenetic and genetic alterations contribute to tumorigenesis. Here, we hypothesize that peritoneal mesothelioma also has an epigenetic alteration in the same genes (Kazal-type serine peptidase inhibitor domain 1 (KAZALD1), transmembrane protein 30B (TMEM30B), and mitogen-activated protein kinase 13 (MAPK13)). Our goal is to identify DNA methylation of these three candidate genes in two peritoneal mesothelioma cases. Laser capture microdissection was used to separate diseased sections of formalin-fixed paraffin-embedded samples from one surgically resected tissue (epithelial type) and one autopsy tissue (sarcomatous type). Genomic DNA was subsequently extracted by the standard phenol chloroform method. The DNA was then treated with sodium bisulphite, and pyrosequencing analysis was used to quantitatively analyze the methylation of candidate genes reported to be hypermethylated in malignant pleural mesothelioma (KAZALD1, TMEM30B, and MAPK13). TMEM30B and MAPK13 were not methylated in either case. However, KAZALD1 was highly methylated in sarcomatoid-type peritoneal mesothelioma. We first report that the KAZALD1 gene was hypermethylated in sarcomatoid-type malignant peritoneal mesothelioma.
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Abbreviations
- MM:
-
Malignant mesothelioma
- MPM:
-
Malignant pleural mesothelioma
- MPEM:
-
Malignant peritoneal mesothelioma
- NF2:
-
Neurofibromatosis type 2
- KAZALD1:
-
Kazal-type serine peptidase inhibitor domain 1
- TMEM30B:
-
Transmembrane protein 30B
- MAPK13:
-
Mitogen-activated protein kinase 13
- PCR:
-
Polymerase chain reaction
- CT:
-
Computed tomography
- US:
-
Ultrasound
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Acknowledgments
This work was supported in part by The Japanese Foundation for Research and Promotion of Endoscopy (JFE) and The Japanese Society of Gastroenterology (JSGE) and The Princess Takamatsu Cancer Research Fund. Yoshiyuki Watanabe is a member of The Japan Gastroenterological Endoscopy Society (JGES) and the JSGE and is supported by a generous gift from both the JFE and the JSGE. The authors are grateful to Mr. Hiroyuki Nishikawa for his technical advice and Ms. Tina Butterfield for her critical advice.
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Ryota Hama and Yoshiyuki Watanabe contributed equally to this work.
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Supplementary Table 1
Primers and PCR conditions (DOC 99 kb)
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Hama, R., Watanabe, Y., Shinada, K. et al. Characterization of DNA hypermethylation in two cases of peritoneal mesothelioma. Tumor Biol. 33, 2031–2040 (2012). https://doi.org/10.1007/s13277-012-0462-8
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DOI: https://doi.org/10.1007/s13277-012-0462-8