The Role of ARNT in Vascular and Cardiac Developnent

ARNT 在血管和心脏发育中的作用

• 批准号: 7218358
• 负责人: DIANA L RAMIREZ-BERGERON
• 金额: $ 5.71万
• 依托单位: CHILDREN'S HOSP OF PHILADELPHIA
• 依托单位国家: 美国
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-06-09 至 2008-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7218358
• 关键词: angiogenesis; cardiogenesis; cell differentiation; cell line; cell migration; cell proliferation; embryo /fetus tissue /cell culture; embryonic stem cell; gene targeting; genetically modified animals; hematopoiesis; hypoxia; hypoxia inducible factor 1; laboratory mouse; mammalian embryology; mesenchyme; oxygen tension; protein structure function; transcription factor; vascular endothelium; yolk sac

DESCRIPTION (provided by applicant): The objective of this K01 award is to provide intensive mentoring and research training to the minority principal investigator that will allow for an effective transition into an independent academic researcher. The candidate will receive scientific and career mentorship from well established, highly motivational sponsors and advisory committee members. In the past, the investigator has focused on hematopoietic development. The proposed research will redirect her research to acquisiton of new skills in the areas of cardiovascular development and hypoxic biology. The proposal is based on work from Dr. Simon's laboratory encompassing work in hematopoiesis and vasculogenesis. Mutations in various subunits of the Hypoxia Inducible Factor (HIF) family, an important hypoxic transcriptional mediator, have contributed to the understanding the role 02 tension plays during early embryonic development. Abrogation of the Arnt subunit of the HIF heterodimer resulted in embryonic lethality by 10.5 days postcoitum (dpc) with yolk sac, placental, cardiac, and vascular defects. The goal of this proposal is to characterize the role of 02 in cardiovascular development, particularly on endothelial cells. The specific aims are to 1) determine how hypoxia influences endothelial behavior, 2) examine the hematopoietic and angiogenic potential of intraembryonic tissues of Amt -/- mice, and 3) determine the effect of hypoxia in heart development. Accomplishing these specific aims will provide an understanding of hypoxic signals in mediating biological responses required for the growth and differentiation of the cardiovascular system. Furthermore, the examination of the cellular and molecular responses to hypoxia will provide important insights into various disease states, including tumor growth, diabetic retinopathy, preeclampsia, wound healing, and ischemia. Additionally, the detailed studies of this proposal and the senior guidance of the faculty committee will assist in commanding the investigator into a leader in the field of cardiovascular biology.

描述（由申请人提供）：该K 01奖项的目标是为少数族裔主要研究者提供密集的指导和研究培训，以便有效地过渡到独立学术研究人员。 候选人将从成熟的，高度激励的赞助商和咨询委员会成员那里获得科学和职业指导。 在过去，研究者一直专注于造血发育。 这项拟议的研究将把她的研究方向转向心血管发育和缺氧生物学领域的新技能。 该提案是基于西蒙博士实验室的工作，包括造血和血管发生的工作。 缺氧诱导因子（HIF）家族（一种重要的缺氧转录介质）的各种亚基中的突变有助于理解O2张力在早期胚胎发育期间所起的作用。 去除HIF异源二聚体的Arnt亚基导致胚胎死亡，并伴有卵黄囊、胎盘、心脏和血管缺陷。 该提议的目标是表征O2在心血管发育中的作用，特别是对内皮细胞的作用。 具体目的是：1）确定缺氧如何影响内皮行为，2）检查造血和血管生成的潜力，胚胎内组织的ESTA-/-小鼠，和3）确定缺氧在心脏发育的影响。 实现这些具体目标将提供缺氧信号介导的心血管系统的生长和分化所需的生物反应的理解。 此外，对缺氧的细胞和分子反应的检查将提供对各种疾病状态的重要见解，包括肿瘤生长、糖尿病视网膜病变、先兆子痫、伤口愈合和缺血。此外，本提案的详细研究和教师委员会的高级指导将有助于指挥研究者成为心血管生物学领域的领导者。