Our overall objectives are to define and understand the cellular mechanisms responsible for tumor development and progression in biliary epithelia. Chronic biliary tract inflammation predisposes to cholangiocarcinoma formation. Our long term objectives are to understand the mechanisms by which inflammatory mediators contribute to the development and progression of cholangiocarcinoma. We have focused on understanding the mechanisms by which aberrant cellular responses to Interleukin-6 contribute to cholangiocarcinoma growth and response to therapy. We have shown that: (i) IL-6 modulates expression of non-coding RNA (ncRNA) genes such as microRNAs (miRNA) and transcribed ultraconserved regions (UCR);(ii) selected ncRNA genes are aberrantly expressed in human cholangiocarcinoma and can modulate the response to therapeutic interventions;(iii) IL-6 modulates DNMT-1 and cancer-associated gene expression in a miRNA dependent manner;(iv) cholangiocytes release nanoparticles that contain ncRNA;and (v) computational bioinformatics analysis of genomic profiles associated with IL-6 expression can identify novel therapeutics. Based on these striking and extensive preliminary data, we propose the CENTRAL HYPOTHESIS that de-regulated expression of IL-6 during biliary tract inflammation leads to altered intracellular signaling and modified expression of ncRNA resulting in aberrant gene expression which enhances tumorigenesis and growth in biliary epithelia. We will now use current and complementary molecular, biochemical and cell biological approaches to ascertain how IL-6 regulates these unexplored pathways of regulation of gene expression. Our proposal has four SPECIFIC AIMS. FIRST, we will directly test the hypothesis that IL-6 modulates methylation dependent expression of genes involved in cholangiocarcinogenesis by altered expression of miRNA. SECOND, we will test the hypothesis that expression of miRNA can be modulated by UCR. NEXT, we will evaluate ncRNA as intercellular signaling intermediates capable of effecting cellular changes. FINALLY, we will test the hypothesis that IL-6 dependent ncRNA expression can be targeted for treatment of cholangiocarcinoma. The innovative aspects of this proposal include: new concepts regarding the inflammation-cancer axis, regulation and function of ncRNA genes, and mechanisms of intercellular communication;new in vitro approaches to elucidating RNA gene function and biological roles and test of new hypotheses regarding regulation of gene expression and their functional impact. Our results will yield new mechanistic insights into cholangiocyte responses to environmental changes, identify the role and functions of novel RNA genes in the molecular pathogenesis of cholangiocarcinoma and identify novel therapeutic strategies for these cancers.

Public Health Relevance

Cholangiocarcinomas, the most important neoplastic biliary tract diseases are incurable cancers that are increasing in incidence. They are associated with altered expression of inflammation- associated cytokines and of RNA genes which are involved in cell survival. We believe that abnormalities in cytokine dependent expression of RNA genes are central to tumor formation and growth. This proposal will examine the genes involved and the cellular mechanisms by which these cancers form and grow as well as test new pharmacologic therapies to inhibit their development and progression.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK069370-08
Application #
8284325
Study Section
Hepatobiliary Pathophysiology Study Section (HBPP)
Program Officer
Serrano, Jose
Project Start
2005-09-01
Project End
2015-05-31
Budget Start
2012-06-01
Budget End
2013-05-31
Support Year
8
Fiscal Year
2012
Total Cost
$250,619
Indirect Cost
$86,279
Name
Mayo Clinic Jacksonville
Department
Type
DUNS #
153223151
City
Jacksonville
State
FL
Country
United States
Zip Code
32224
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Takahashi, Kenji; Yan, Irene K; Wood, Joseph et al. (2014) Involvement of extracellular vesicle long noncoding RNA (linc-VLDLR) in tumor cell responses to chemotherapy. Mol Cancer Res 12:1377-87
Haga, Hiroaki; Yan, Irene; Takahashi, Kenji et al. (2014) Emerging insights into the role of microRNAs in the pathogenesis of cholangiocarcinoma. Gene Expr 16:93-9
Patel, Tushar (2014) New insights into the molecular pathogenesis of intrahepatic cholangiocarcinoma. J Gastroenterol 49:165-72
Patel, Tushar; Harnois, Denise (2014) Assessment of response to therapy in hepatocellular carcinoma. Ann Med 46:130-7
Ngamruengphong, Saowanee; Patel, Tushar (2014) Molecular evolution of genetic susceptibility to hepatocellular carcinoma. Dig Dis Sci 59:986-91
Patel, Tushar (2014) Extracellular vesicle noncoding RNA: new players in the diagnosis and pathogenesis of cholangiocarcinoma. Hepatology 60:782-4
Takahashi, Kenji; Yan, Irene; Haga, Hiroaki et al. (2014) Long noncoding RNA in liver diseases. Hepatology 60:744-53
Takahashi, Kenji; Yan, Irene K; Kogure, Takayuki et al. (2014) Extracellular vesicle-mediated transfer of long non-coding RNA ROR modulates chemosensitivity in human hepatocellular cancer. FEBS Open Bio 4:458-67
Takahashi, Kenji; Yan, Irene K; Haga, Hiroaki et al. (2014) Modulation of hypoxia-signaling pathways by extracellular linc-RoR. J Cell Sci 127:1585-94

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