Abstract
We searched for candidate target genes in metastatic gastric cancer, using comparative genomic hybridization (CGH) and mRNA expression array analysis of endoscopic biopsy samples collected from 32 patients. Recurrent amplicons included 17q21.2 (36,569,293–37,307,055), 8q24.13-q24.21 (126,357,475–130,159,285), and 20q13.33 (60,211,249–61,382,787). In this paper, we focused on the 1.1-Mb genomic region containing 24 genes in chromosome 20q13.33 (from 60,211,249 to 61,382,787), the third most frequent amplicon that was amplified in three of 32 patients (9.4 %), with log2 tumor/reference ratios ranging from 0.6 to 1.5. Of three genes in the 20q13.33 amplicon, ADRM1 was chosen for functional analyses. ADRM1 knockdown suppressed the proliferation of two human gastric cancer cells, SNU-601 and SNU-216. Overexpression of Adrm1 promoted cell proliferation of conditionally-immortalized, mouse ImSt gastric epithelial cells, with increased S1 phase fraction and decreased expression of p21(Cip1). These results collectively indicate that ADRM1 promoted gastric epithelial cell proliferation by cell cycle progression. Therefore, ADRM1 is a candidate target gene in the chromosome 20q13.33 amplicon that may possibly be linked to development of gastric cancer.
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Abbreviations
- CGH:
-
Comparative genomic hybridization
- EGFP:
-
Enhanced green fluorescent protein
- ANOVA:
-
Analysis of variance
- FISH:
-
Fluorescence in situ hybridization
- FFPE:
-
Formalin-fixed: paraffin-embedded
- FITC:
-
Fluorescein isothiocyanate
- FACS:
-
Fluorescence-activated cell sorting
- TMA:
-
Tissue microarray
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Acknowledgments
This work was supported by the Proteogenomic Research Program and 2013K000429 funded by the Korean Ministry of Science, ICT, and Future Planning and by National Cancer Center Grant 1210051 and 1410850.
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Jang, S.H., Park, J.W., Kim, H.R. et al. ADRM1 gene amplification is a candidate driver for metastatic gastric cancers. Clin Exp Metastasis 31, 727–733 (2014). https://doi.org/10.1007/s10585-014-9663-4
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DOI: https://doi.org/10.1007/s10585-014-9663-4