DUCK HEPATITIS B VIRUS DNA WITHIN HEPATIC MULTICENTRIC CANCER AND/OR METASTATIC CANCER

Duck hepatitis B vims (DHBV) DNA was detected in different tumorous nodules of ducks with hepatic multicentric cancer or intrahepatic metastasis by Southern blot technique. Among 7 ducks with hepatocellular carcinoma of multiple tumor nodules, the hybridization pattern of Integrated DHBV DNA In different tumorous nodules was identical in 3 cases and different in 2 cases. One case showed a similar hybridization pattern in two tumorous nodules and other one was negative tor DHBV DNA. Integrated DHBV DNA was also identified in a metastatic lung cancer of ducks with hepatocellular carcinoma. The hybridization pattern of metastasis of lungs was as the some as that in primary hepatocellular carcinoma. The same discrete hybridization bands In the different tumorous nodules indicate that these nodules might arise from one transformed cell. The different hybridization patterns In various tumorous nodules show that these tumorous nodules might arise from various transformed cells. The results suggest that the hybridization pattern of different nodules of hepatocellular carcinoma with viral DNA probe could make a cell clone origin marker of tumor nodule to differentiate hepatic multlcentric cancer from Intrahepatic metastatic cancer.

Target gene prediction and functional analysis of miRNAs differently expressed in colon cancer primary tumors to metastases formed in the liver

Background:Colon cancer is one of the main tumor-related causes of death worldwide and now surgical resection is still the most effective method for the treatment of colon cancer.However,many colon cancers currently lose the opportunity for surgical treatment because of liver metastases.The possible molecular mechanism of liver metastasis of colon cancer can provide ideas for the prevention and treatment of liver metastasis colon cancer.Several studies have recently indicated the regulatory effects of microRNAs(miRNAs)in cancer metastasis.Bioinformatics methods were used to analyze the differentially expressed miRNAs in primary colon cancer tissues and liver metastases.Then the target genes of differentially expressed miRNAs were predicted.By analyzing the biological processes and signaling pathways that the target gene may participate in,we infer the possible molecular mechanisms of liver metastasis of colon cancer and the effects of target genes on prognosis of patients were explored.Methods:The chip data GSE98406 was selected and differentially expressed miRNAs between primary colon cancer and liver metastatic colon cancer were explored by Morpheus.TargetScan and miRanda were used to predict target genes of differentially expressed miRNAs.The gene oncology and Kyoto Encyclopedia of Genes and Genomes pathway analyses were performed to analyze the biological processes and possible signaling pathways the target genes involved in.Protein-ptotein interaction analysis was performed by String and Cyotscape,the interactions among target genes and hub genes were analyzed.Finally,we explored the effects of differentially expressed miRNAs and their target genes on the prognosis of colon cancer patients.Results:Two differentially expressed miRNAs were screened out,of which miR-122 was upregulated more than 2 folds and miR-143 was downregulated more than twofold in liver metastatic colon cancer.Target genes of miR-122 and miR-143 were mainly involved in energy metabolism.The major signaling pathways involved are epithelial-mesenchymal transition pathways.Ten hub genes were selected by protein interaction analysis.Among them,KRAS,CDK1,CREB1,CS,PC,RAB7A,and CANX were highly expressed in tumor tissues,and CALM1 and MAPK7 were lowly expressed in tumor tissues.The results showed that reduced expression of CS and PC reduced survival of patients with colon cancer.However,the impact of miR-122 and mi-143 on the prognosis of patients with colon cancer is not clear.Conclusion:Differentially expressed miRNAs mainly affect the expression of target genes involved in energy metabolism and cellular transformation in colon cancer.Intracellular metabolic activity is the center of cellular activity,the treatment of metabolic processes in tumor cells may be a new idea for the treatment of tumors.