Role of Uhrf1 in Liver Development, Regeneration and Carciogenesis

Uhrf1 在肝脏发育、再生和癌变中的作用

• 批准号: 7911284
• 负责人: Kirsten C Sadler Edepli
• 金额: $ 9.99万
• 依托单位: BRIGHAM AND WOMEN'S HOSPITAL
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7911284
• 关键词: Address; Adult; Apoptosis; Biochemical; Biochemistry; Biological; Cancer Biology; Cancer cell line; Carcinogens; Cell Culture Techniques; Cell Cycle; Cell Proliferation; Cell division; Cells; Chronic; Clinical; Cultured Cells; Cyclin A; DNA Methylation Regulation; DNA Methyltransferase; DNA Modification Methylases; DNA-Binding Proteins; Data; Development; Disease; Embryo; Embryonic Development; Event; Fingers; Fishes; Gene Dosage; Gene Targeting; Genes; Genetic; Genetic Programming; Genetic Screening; Goals; Growth; Hepatic; Hepatocarcinogenesis; Hepatocyte; Human; Human Biology; Human Genetics; In Vitro; Injection of therapeutic agent; Injury; Link; Liver; Liver Regeneration; Liver diseases; Liver neoplasms; Malignant Neoplasms; Malignant neoplasm of liver; Mammalian Cell; Mammals; Mediating; Modeling; Natural regeneration; Oncogenes; Oncogenic; Partial Hepatectomy; Pathologic; Pathway interactions; Patient Care; Patients; Phenotype; Phosphorylation; Physiological; Play; Predisposition; Primary carcinoma of the liver cells; Process; Property; Protein Binding; Publishing; Regulation; Role; Sampling; Suggestion; System; TOP2A gene; Techniques; Tertiary Protein Structure; Testing; Topoisomerase; Transcript; Transcription Coactivator; Transgenic Organisms; Ubiquitin; Up-Regulation; Work; Zebrafish; cancer genomics; cell transformation; chemotherapeutic agent; cohort; cost effective; cyclin A2; fatty acid-binding proteins; human CDK2 protein; human HDAC1 protein; in vivo; interest; knock-down; liver cell proliferation; loss of function mutation; mimetics; mutant; novel; promoter; public health relevance; response; tissue culture; tumor; tumorigenesis; ubiquitin-protein ligase; zebrafish development

DESCRIPTION (provided by applicant): Liver development in embryos and regeneration in adults are characterized by regulated hepatocyte proliferation. This contrasts with the unregulated hepatocyte proliferation that accompanies many chronic hepatic diseases and hepatocellular carcinoma (HCC). While there is suggestion that common genetic pathways regulate both physiologic and pathologic hepatocyte proliferation, only a few studies in mammals illustrate this hypothesis. By forward genetic screening in zebrafish embryos combined with functional studies on liver regeneration in adults and expression analysis of human HCC samples, we have found that the ubiquitin-like, containing PHD and RING finger domains-1 (uhrf1) gene is essential for physiologic hepatocyte proliferation. We also believe that alterations in UHRF1 expression and/or regulation also contribute to deregulated proliferation in cancer. The work in this proposal will use a combination of zebrafish development and genetics, human cancer genomic analysis and mammalian tissue culture cell cycle studies and biochemistry to address 3 aspects of UHRF1 function in relation to hepatocyte proliferation. In Specific Aim 1, we will examine the mechanism by which UHRF1 functions in regulating hepatocyte proliferation in zebrafish embryos. In Specific Aim 2, we will elucidate how UHRF1 is regulated through phosphorylation by cyclin dependent kinase 2. The functional relevance of this phosphorylation will be assessed on cultured cells using biochemical and cell biological techniques. In Specific Aim 3, we will determine the role of UHRF1 in hepatocarcinogenesis. By analysis of human HCC samples, we will evaluate the possibility that amplification of the UHRF1 locus contributes to its upregulation in cancer. Secondly, we will perform genetic and oncogenic studies in zebrafish and determine if UHRF1 is necessary and sufficient for hepatic tumor formation. In summary, this proposal will link together mechanisms that control hepatocyte proliferation in the embryo and during liver regeneration with those that control hepatocarcinogenesis. This proposal has direct relevance to the field of liver disease. Because the burden of liver disease remains enormous, the identification of genes that play critical roles in hepatocyte proliferation and in HCC progression are of significant scientific and clinical importance. The goal is to identify novel mechanisms of hepatocyte proliferation that can aid in the development of chemotherapeutic agents for use in management of patients with chronic liver diseases including HCC. PUBLIC HEALTH RELEVANCE: We are interested in how the liver develops, how it restores itself after injury and how liver cancer occurs. We believe that all three processes are linked and that understanding of normal liver growth will help in caring for patients with liver cancer. We believe that we have discovered a gene called UHRF1 that is involved in all the three processes and will study how it plays a role in each situation. PHS 398/2590 (Rev. 09/04, Reissued 4/2006) Page Continuation Format Page

描述（由申请方提供）：胚胎中的肝脏发育和成人中的再生的特征在于受调控的肝细胞增殖。这与伴随许多慢性肝病和肝细胞癌（HCC）的不受调节的肝细胞增殖形成对比。虽然有建议，共同的遗传途径调节生理和病理肝细胞增殖，只有少数研究在哺乳动物说明这一假设。通过对斑马鱼胚胎的正向遗传学筛选，结合成年人肝再生的功能研究和人肝癌标本的表达分析，我们发现含有PHD和RING指结构域-1（uhrf 1）的泛素样基因对肝细胞的生理性增殖是必需的。我们还认为，UHRF 1表达和/或调节的改变也有助于癌症中的增殖失调。本提案中的工作将使用斑马鱼发育和遗传学，人类癌症基因组分析和哺乳动物组织培养细胞周期研究和生物化学的组合，以解决与肝细胞增殖相关的UHRF 1功能的3个方面。在具体目标1中，我们将研究UHRF 1在调节斑马鱼胚胎肝细胞增殖中的作用机制。在具体目标2，我们将阐明如何UHRF 1是通过磷酸化细胞周期蛋白依赖性激酶2调节。将使用生物化学和细胞生物学技术在培养的细胞上评估这种磷酸化的功能相关性。在具体目标3中，我们将确定UHRF 1在肝癌发生中的作用。通过对人HCC样本的分析，我们将评估UHRF 1基因座的扩增有助于其在癌症中上调的可能性。其次，我们将在斑马鱼中进行遗传和致癌研究，并确定UHRF 1是否是肝肿瘤形成的必要和充分条件。总之，这项建议将把控制胚胎中肝细胞增殖和肝再生过程中肝细胞增殖的机制与控制肝癌发生的机制联系起来。该提案与肝病领域直接相关。由于肝脏疾病的负担仍然巨大，因此鉴定在肝细胞增殖和HCC进展中起关键作用的基因具有重要的科学和临床意义。目的是确定肝细胞增殖的新机制，可以帮助开发用于治疗慢性肝病（包括HCC）患者的化疗药物。公共卫生相关性：我们感兴趣的是肝脏如何发育，受伤后如何恢复以及肝癌如何发生。我们相信这三个过程是相互联系的，了解肝脏的正常生长将有助于照顾肝癌患者。我们相信，我们已经发现了一种名为UHRF 1的基因，它参与了所有这三个过程，并将研究它在每种情况下如何发挥作用。PHS 398/2590（2004年9月修订，2006年4月重新印发）