Genetic Architecture of Natriuretic Peptides and Blood Pressure Response
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 入组人数
- 200
- 试验地点
- 1
- 主要终点
- Change in N-terminal pro-B-type Natriuretic Peptide (NTproBNP) (NTproBNP)
研究概览
简要总结
Natriuretic peptides (NPs) are hormones produced by the heart and play an important role in maintaining cardiovascular health and have favorable metabolic benefits. Low NP levels are associated with an increased likelihood of the development of cardiometabolic diseases like diabetes and hypertension. NP levels are known to be highly heritable, with up to half of the differences in NP levels being explained by genetics. The investigators aim to describe the genetic architecture of NPs by examining the genetic variants associated with NPs, and generate and validate a polygenic score (PGS) for NPs. The investigators will use this NP PGS to examine the association of genetically determined NP levels with cardiometabolic and cardiovascular outcomes. The investigators will conduct a genotype-guided physiological clinical trial that aims to assess the genetic factors affecting NP levels and their impact on blood pressure and NP response to saline infusion, high-salt diet, and low-salt diet. These findings will help support personal medicine approaches to lower the increasing burden of hypertension in the United States.
详细描述
NPs are vital cardiac-derived hormones that are known for their role in salt regulation, vascular function, and blood pressure (BP) regulation. NPs are also key regulators of insulin sensitivity, lipid metabolism, and energy expenditure. Recent evidence has shown that low NP levels are associated with higher risk of cardiometabolic diseases like hypertension (HTN). Animal studies have shown that the loss of the NP gene in mice is associated with the development of salt-sensitive HTN. Prior research indicates that individuals with genetically lower NP levels show higher systolic and diastolic BP and are at a 15% higher risk of HTN.
NP levels are highly heritable, with heritability ranging from 35%-44%, independent of factors like age, body mass index, sex, and race. The availability of whole genome sequencing (WGS) data from a comprehensive cohort of individuals provides an opportunity to advance the discovery of novel genomic loci and rare variants regulating NP levels. Previous studies on the genetic determinants of NP levels were limited by their focus on diseased populations, use of genotyping array data, or lack of comprehensive genetic analysis. Examination of the genotype-based differences in NP may provide not only insights into the pathophysiology of diseases like salt-sensitive HTN, but also help discover new pharmacogenomic treatment approaches.
In the proposed study, the investigators will leverage data from multiple large cohorts, including the TransOmics for Precision Medicine cohorts, UK Biobank, and All of Us Research Program, to investigate the genetic architecture of NP levels, including the common, rare, and structural variants. The investigators will conduct fine mapping to identify variants that might cause disease and perform analyses to prioritize genes associated with NPs. Additionally, the summary statistics of the common variant analysis will be used to develop NP polygenic risk scores using standardized methodologies. The best-performing NP PGS will be validated, and the association of genetically determined NP levels with cardiometabolic and cardiovascular disease will be examined. The NP PGS will then be used to conduct a Mendelian randomization analysis to examine the causal role of NPs in cardiometabolic disease.
The investigators will enroll 200 hypertensive participants for 4 weeks, during which the participants will receive 1 week each of high and low-salt diets in a random sequence, and undergo a volume loading using a normal saline infusion protocol at the end of each diet period. Each diet period will be followed by a week of washout.
The investigators hypothesize that individuals with genetically determined low NP levels will exhibit a poorer response to salt and volume loading. The main questions this study aims to answer are:
研究设计
- 研究类型
- Interventional
- 分配方式
- Non Randomized
- 干预模型
- Crossover
- 主要目的
- Prevention
- 盲法
- Single (Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Age more than or equal to 18 years
- •Consenting to collection of genetic material and willing to adhere to study protocol
- •Stage I/II Hypertension (Systolic blood pressure: 130-159 and Diastolic blood pressure: 80-99 mm Hg)
排除标准
- •Body mass index (BMI) more than 45 kg/m2
- •History of uncontrolled hypertension (i.e., Systolic blood pressure more than or equal to 160 mmHg and/or Diastolic blood pressure more than or equal to 100 mmHg)
- •If taking more than or equal to 2 blood pressure medications at the time of screening
- •Systolic blood pressure more than 180 and/or Diastolic blood pressure more than or equal to 120 mmHg at any point in the study
- •Present or past history of major cardiovascular disease including myocardial infarction, angina, cardiac arrhythmia, heart failure, stroke, transient ischemic attack, or seizure.
- •Pregnant or breastfeeding individuals
- •History of kidney disease
- •History of insulin requiring diabetes
- •Estimated glomerular filtration rate less than 60ml/min/1.73 m2, albumin creatinine ratio more than or equal to 30 mg/g
- •Hepatic transaminase levels more than 3 times the upper limit of normal
- •Anemia (men, Hb less than 13 g/dL; women, Hb less than 12 g/dL)
研究组 & 干预措施
High Natriuretic Peptide Polygenic Score
Active Comparator: High NP PGS Group
干预措施: Low Salt Diet (Dietary Supplement)
High Natriuretic Peptide Polygenic Score
Active Comparator: High NP PGS Group
干预措施: High Salt Diet (Dietary Supplement)
High Natriuretic Peptide Polygenic Score
Active Comparator: High NP PGS Group
干预措施: Saline Infusion (Dietary Supplement)
Low Natriuretic Peptide Polygenic Score
Experimental: Low NP PGS Group
干预措施: Low Salt Diet (Dietary Supplement)
Low Natriuretic Peptide Polygenic Score
Experimental: Low NP PGS Group
干预措施: High Salt Diet (Dietary Supplement)
Low Natriuretic Peptide Polygenic Score
Experimental: Low NP PGS Group
干预措施: Saline Infusion (Dietary Supplement)
结局指标
主要结局
Change in N-terminal pro-B-type Natriuretic Peptide (NTproBNP) (NTproBNP)
时间窗: 3 weeks
Difference in the change in NTproBNP levels following high and low salt diets, between the the polygenic score groups.
Change in 24h mean Systolic Blood Pressure (SBP)
时间窗: 3 weeks
Difference in the change in 24h mean SBP following high and low salt diets, between the polygenic score groups.
次要结局
- Change in Nighttime Urinary Excretion (Sodium)(3 weeks)
- Change in Natriuretic Peptide Levels (BNP)(3 weeks)
- Change in Natriuretic Peptide Levels (MRproANP)(3 weeks)
- Change in Nighttime Diastolic Blood Pressure (DBP)(3 weeks)
- Change in Daytime Systolic Blood Pressure (SBP)(3 weeks)
- Change in 24h Urinary Excretion (Sodium)(3 weeks)
- Change in Daytime Urinary Excretion (Sodium)(3 weeks)
- Change in Nighttime Urinary Excretion (Potassium)(3 weeks)
- Change in Natriuretic Peptide Levels (BNP) with Volume Loading(3 weeks)
- Change in 24h mean Diastolic Blood Pressure (DBP)(3 weeks)
- Change in Daytime Diastolic Blood Pressure (DBP)(3 weeks)
- Change in Nighttime Systolic Blood Pressure (SBP)(3 weeks)
- Change in 24h Urinary Excretion (Potassium)(3 weeks)
- Change in Daytime Urinary Excretion (Potassium)(3 weeks)
- Change in Natriuretic Peptide Levels (NTproBNP) with Volume Loading(3 weeks)
- Change in Natriuretic Peptide Levels (MRproANP) with Volume Loading(3 weeks)
研究者
Pankaj Arora, MD
Associate Professor, Division of Cardiovascular, Department of Medicine
University of Alabama at Birmingham