Abstract
Purpose
It is well known that gastric cancers (GCs) at early stages, independent of the histological type, mainly consist of gastric phenotype malignant cells, while those at advanced stage tend to have a more intestinal phenotype with progression. However, the connection between this shift and expression of homeobox genes, which are important factors to maintain tissue character, has remained unclear. We therefore evaluated the expression of Cdx1/2 in relation to the phenotype of GCs.
Methods
We analyzed the expression of Cdx1/2 mRNAs by Northern blotting and Cdx2 protein by immunohistochemistry in seventy advanced GCs, and evaluated phenotypically using mucin- and immunohistochemistry.
Results
Seventy GCs were divided phenotypically into 16 gastric (G type), 18 gastric and intestinal mixed (GI type), 18 intestinal (I type), and 18 null (N type) phenotypes, independent of the histological classification. Cdx1 and Cdx2 mRNAs statistically demonstrated an increase with shift from G to I (P=0.042 and P=0.0082, respectively). Cdx2 nuclear staining was observed immunohistochemically in the intestinal phenotypic cancer cells, but could not be detected in those with only the gastric phenotype.
Conclusions
These results show that Cdx1 and Cdx2 might be indispensable for intestinal phenotypic expression even in gastric cancer cells.
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Acknowledgments
The authors thank Dr. Malcolm A. Moore for revision of the scientific English language and Ms. Hisayo Ban, Ms. Michiyo Tominaga, and Ms. Sachiko Tokumasu for expert technical assistance. This study was supported in part by a Grant-in-Aid for the Millennium Genome Project, a Grant-in-Aid for the Second-term Comprehensive 10-year Strategy for Cancer Control and a Grant-in-Aid for Cancer Research from the Ministry of Health, Labour and Welfare, Japan, and a Grant-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology of Japan. The Cdx1 and Cdx2 expression vectors were generous gifts from Dr. Juan Lucio Iovanna, Centre de Recherche, INSERM, Marseille, France.
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Mizoshita, T., Inada, Ki., Tsukamoto, T. et al. Expression of the intestine-specific transcription factors, Cdx1 and Cdx2, correlates shift to an intestinal phenotype in gastric cancer cells. J Cancer Res Clin Oncol 130, 29–36 (2004). https://doi.org/10.1007/s00432-003-0503-1
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DOI: https://doi.org/10.1007/s00432-003-0503-1