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Micrornas Associated with Granulin-Epithelin Precursor in Hepatocellular Carcinoma

Micrornas Associated with Granulin-Epithelin Precursor in Hepatocellular Carcinoma


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About the Book

This dissertation, "MicroRNAs Associated With Granulin-epithelin Precursor in Hepatocellular Carcinoma" by Pok, Lau, 劉博, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Hepatocellular carcinoma (HCC) is the major type of liver cancer. In Hong Kong, thousands of deaths are related to this disease every year. Hepatitis B virus (HBV) infection is one of the major risk factors of HCC development. The high prevalence of HBV carriers in Southeast Asia including Hong Kong can account for the particularly high HCC cases in these areas. HCC is often asymptomatic. The diagnosis and treatment are often delayed which lead to inapplicable of surgical resection. Meanwhile, conventional treatment regimes such as systemic chemotherapy were found to have limited responses. Hence, the case mortality rate of HCC is the second highest among all the cancers. Granulin-epithelin Precursor (GEP) is a glycoprotein growth factor which regulates multiple cellular functions. Our group has demonstrated that GEP is over-expressed in more than 70% of HCC cases and GEP expression is positively correlated to tumor malignancy. Our group has also verified that suppression of GEP by monoclonal antibody leads to significant inhibition of HCC growth and reduction of malignancy. Therefore, GEP has the potential to be a novel therapeutic target of HCC. MicroRNAs (miRNAs) are short non-coding RNAs that regulate mRNA translation. Previous studies showed that miRNA dys- regulation is closely associated with HCC progression and the high stability of miRNAs allows them to be cancer biomarkers or therapeutic targets. This project aims to investigate the miRNAs that regulate GEP and their functions in HCC. Potential GEP-regulating miRNAs were identified by literature review and in silico prediction by bioinformatics tools. MiR-615-5p, miR-588, miR-29b, miR-195, and miR-659 were identified as the potential candidates. Quantitative polymerase chain reaction (qPCR) was utilized to examine the miRNAs' expressions in HCC clinical samples. Only miR-29b and miR-195 were detected and hence they were selected for further study. Our results showed that miR-29b and miR-195 expression levels were significantly decreased in HCC comparing to adjacent non‐tumor tissue (PMiR‐195 and miR‐29b were over‐expressed in Hep3B HCC cell lines by miRNA mimics and GEP protein level was significantly suppressed after miR-29b mimic transfection. The transcript level of GEP was found to be unchanged after the miR‐29b over-expression. This suggests miR‐29b does not regulate GEP protein expression by mRNA degradation. The effects of miR‐195 and miR‐29b on HCC proliferation were also examined. The growths of HCC cells were suppressed notably after over-expression of miR‐195 (PIn conclusion, miR‐195 and miR‐29b are frequently down-regulated in HCC. MiR‐29b can negatively regulate GEP expression and does not interfere with GEP mRNA level. Furthermore, miR‐195 and miR-29b can function to inhibit HCC cell growth significantly. DOI: 10.5353/th_b5328063 Subjects: Protein precursors Liver - Cancer - Genetic aspects Small interfering RNA


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Product Details
  • ISBN-13: 9781361357712
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 114
  • Weight: 558 gr
  • ISBN-10: 1361357711
  • Publisher Date: 27 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 8 mm
  • Width: 216 mm


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