Abstract
Background
Recurrence determines the postoperative prognosis with hepatocellular carcinoma (HCC). It is unknown how the liver dysfunction involving organic anion transporter failure causes the occurrence of HCCs. This study was designed to elucidate the link between liver dysfunction and multicentric occurrence (MO) after radical hepatectomy.
Methods
Forty-nine samples of noncancerous liver tissue from HCC patients within the Milan criteria who were treated at our institution between January 2004 and August 2008 were examined as a training set by using genome-wide gene expression analysis. Using the independent 2-institutional cohort of 134 patients between September 2008 and December 2009, we performed a validation study using tissue microarray analysis. Cox proportional hazard regression analyses for MFS were performed to estimate the risk factors.
Results
In the Gene Ontology database (GO:0015711), SLC22A7 expression was the best predictor of MO-free survival [MFS] (Fold, 0.726; P = 0.001). High SLC22A7 gene expression prevented the occurrence of HCC after hepatectomy (odds ratio [OR], 0.2; P = 0.004). Multivariate analyses identified SLC22A7 expression as an independent risk factor (OR, 0.3; P = 0.043). In the validation study, multivariate analyses of MFS identified SLC22A7 expression as an independent risk factor (OR, 0.5; P = 0.012). As judged by gene set enrichment analysis, SLC22A7 down regulation was associated with mitochondrion (P = 0.008) and oxidoreductase activity (P = 0.006). Sirtuin 3 as a regulator of mitochondrial metabolism also determined MFS (P = 0.018).
Conclusions
The mitochondrial pathways may affect SLC 22A7 function to promote the occurrence of HCC. (Word count: 246).
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Abbreviations
- CI:
-
Confidence interval
- FDR:
-
False discovery rate
- GSEA:
-
Gene set enrichment analysis
- HCC:
-
Hepatocellular carcinoma
- HR:
-
Hazard ratio
- MO:
-
Multicentric occurrence
- NES:
-
Normalized enrichment score
- OR:
-
Odds ratio
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Acknowledgments
This work was supported by a Health and Labour Sciences Research Grant (H20-Kanen-Ippan-001) from the Ministry of Health, Labour, and Welfare of Japan and a Grant-in Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan. The authors thank Hiromi Ohnari and Ayumi Shioya for clerical and technical assistance.
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Accession number of repository for expression microarray data: GSE40873.
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535_2013_791_MOESM2_ESM.tif
Supplementary figure. 1 Sirtuin 3 related mechanisms and the correlation between SLC22A7 transports and mitochondrial mechanisms. Note the orotic acid regulated by sirtuin 3 is transported through SLC22A7. Sirtuin 3 regulates antioxidant pathway, acetate metabolism, and beta-oxidation. (TIFF 3085 kb)
535_2013_791_MOESM3_ESM.eps
Supplementary figure 2. GSEA evaluation of gene-expression profile associated with SLC22A7. Heat map of genes in the sirtuin 3-related gene set. (EPS 894 kb)
535_2013_791_MOESM4_ESM.tif
Supplementary figure 3. GSEA evaluation of gene-expression profile associated with SLC22A7. Note the enrichment plot of sirtuin 3 related gene set (P = 0.008; FDR = 0.008; NES = 1.786). (TIFF 3924 kb)
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Kudo, A., Mogushi, K., Takayama, T. et al. Mitochondrial metabolism in the noncancerous liver determine the occurrence of hepatocellular carcinoma: a prospective study. J Gastroenterol 49, 502–510 (2014). https://doi.org/10.1007/s00535-013-0791-4
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DOI: https://doi.org/10.1007/s00535-013-0791-4