Blood Pressure Regulation by the Circadian Clock Protein Per1

生物钟蛋白 Per1 调节血压

• 批准号: 8491531
• 负责人: Michelle L Gumz
• 金额: $ 7.45万
• 依托单位: UNIVERSITY OF FLORIDA
• 依托单位国家: 美国
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-04-01 至 2015-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8491531
• 关键词: Affect; American; Animal Model; Animals; Atherosclerosis; Biology; Blood Plasma Volume; Blood Pressure; California; Cardiac; Cardiovascular Diseases; Cardiovascular Physiology; Cardiovascular system; Cause of Death; Cerebrovascular Disorders; Cessation of life; Circadian Rhythms; Clinical; Clock protein; Code; Conscious; Contracts; Data; Development; Disease; Duct (organ) structure; Endothelin-1; Epithelial; Essential Hypertension; Etiology; Event; Exhibits; Future; Gene Expression; Gene Targeting; Genes; Genetic; Goals; Heart Rate; Hormones; Hypertension; Hypotension; Immunohistochemistry; Individual; Kidney; Knockout Mice; Lead; Left Ventricular Hypertrophy; Link; Measures; Mediating; Molecular; Mus; Myocardial Infarction; Nuclear; Patients; Pattern; Phosphotransferases; Physiological Processes; Play; Process; Proteins; Publishing; Radio; Regulation; Renal function; Research; Risk; Risk Factors; Role; Sleep Wake Cycle; Sodium; Sodium Channel; Stimulus; Stroke; Telemetry; Testing; Time; Tissues; United States; Universities; Variant; Wild Type Mouse; base; blood pressure regulation; casein kinase I; circadian pacemaker; epithelial Na+ channel; experience; hypertension treatment; in vivo; inhibitor/antagonist; insight; kidney cortex; mortality; mouse model; novel; protein expression; public health relevance; research study; tool; treatment effect

DESCRIPTION (provided by applicant): Cardiovascular disease is the leading cause of death in the United States and hypertension is the principal risk factor for this mortality. Nearly one-third of Americans are hypertensive, and the majority of these individuals have essential hypertension, which denotes the lack of a defined etiology. Circadian fluctuations in blood pressure and cardiac function are well-documented. Cardiovascular events such as stroke and myocardial infarction are known to peak with a circadian pattern and have been linked to the morning increase in blood pressure and heart rate. Indeed, many physiological processes exhibit a circadian pattern, including the sleep- wake cycle, heartbeat, hormone secretion, and renal function. However, the role of the circadian clock in the regulation of these processes is not understood at a molecular level. The long term goal of these studies is to characterize the role of the circadian clock in hypertension and cardiovascular disease. Understanding these mechanisms could lead to new disease treatments. We have found that the circadian clock protein Per1 regulates the expression of the rate-limiting ? subunit of the renal epithelial sodium channel. Our recently published data demonstrate a role for Per1 in the coordinate regulation of several additional genes that code for proteins that contribute to the regulation of renal sodium reabsorption. Per1 positively regulates genes whose products increase sodium reabsorption, and negatively regulates genes whose products inhibit sodium reabsorption. These data led us to hypothesize that Per1 action results in induction of renal sodium reabsorption with consequent increases in plasma volume and blood pressure. Consistent with this hypothesis, we have shown that mice lacking functional Per1 have dramatically lower blood pressure compared to wild type mice. Taken together, these novel findings support our central hypothesis that Per1, as part of the circadian clock mechanism, regulates blood pressure via a renal sodium-dependent mechanism. The goal of this proposal is to test our hypothesis through two specific aims. In the first aim, we will use a pharmacological inhibitor of Per1 nuclear entry and evaluate the effect of this treatment on the expression of Per1 target genes and blood pressure. These studies will determine if Per1 is a viable target for controlling blood pressure. In the second aim, we will develop a kidney-specific Per1 knockout mouse to test the role of Per1 in the regulation of blood pressure by the kidney. These studies have the potential to identify a novel target for the treatment of hypertension and will yield insight into the mechanism of how the circadian clock contributes to the regulation of blood pressure.

描述(申请人提供)：心血管疾病是美国主要的死亡原因，高血压是导致这一死亡的主要危险因素。近三分之一的美国人患有高血压，其中大多数人患有高血压，这意味着缺乏明确的病因。血压和心脏功能的昼夜波动是有据可查的。众所周知，中风和心肌梗塞等心血管事件的高峰期具有昼夜节律，并与早晨血压和心率的增加有关。事实上，许多生理过程呈现出昼夜节律模式，包括睡眠-觉醒周期、心跳、激素分泌和肾功能。然而，生物钟在调节这些过程中的作用在分子水平上还不清楚。这些研究的长期目标是确定生物钟在高血压和心血管疾病中的作用。了解这些机制可能会带来新的疾病治疗方法。我们已经发现生物钟蛋白PER1调节限速？的表达。肾上皮钠亚基 频道。我们最近发表的数据表明，PER1在几个额外基因的协调调节中发挥作用，这些基因编码有助于调节肾脏钠重吸收的蛋白质。PER1正向调节其产物增加钠重吸收的基因，负向调节其产物抑制钠重吸收的基因。这些数据使我们假设，PER1作用导致肾脏钠重吸收，从而导致血浆容量和血压增加。与这一假设一致，我们已经表明，与野生型小鼠相比，缺乏功能性PER1的小鼠血压显著降低。综上所述，这些新的发现支持我们的中心假设，即PER1作为生物钟机制的一部分，通过肾脏钠依赖机制来调节血压。这项提议的目的是通过两个具体目标来检验我们的假设。在第一个目的中，我们将使用一种PER1核进入的药物抑制剂，并评估这种治疗对PER1靶基因表达和血压的影响。这些研究将确定PER1是否是控制血压的可行目标。在第二个目标中，我们将开发一种肾脏特异性的PER1基因敲除小鼠，以测试PER1在肾脏调节血压中的作用。这些研究有可能确定治疗高血压的新靶点，并将深入了解生物钟如何有助于调节血压的机制。