Assessment of Endogenous Oxalate Synthesis in Calcium Oxalate Kidney Stone Formers and Healthy Individuals
草酸钙肾结石形成者和健康个体内源性草酸盐合成的评估
基本信息
- 批准号:10285848
- 负责人:
- 金额:$ 9.97万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2021
- 资助国家:美国
- 起止时间:2021-07-19 至 2023-05-31
- 项目状态:已结题
- 来源:
- 关键词:AddressAdultAffectAscorbic AcidBody mass indexCalcium OxalateChromatographyChronic Kidney FailureCollectionConsumptionContinuous Intravenous InfusionCoupledDataDevelopmentDietDiseaseEndogenous FactorsEnvironmental Risk FactorExcretory functionFemaleFrequenciesFutureGlycineGlycolatesGoalsHourHumanHydroxyprolineIndividualIntakeIntravenous infusion proceduresInvestigationIonsKidneyKidney CalculiLeadLightLinkMass Spectrum AnalysisMeasurementMeasuresMetabolicMetabolic PathwayMethodsNon obeseObesityOxalatesPatientsPilot ProjectsPlayPopulationPrevalencePreventionRecurrenceResearchRiskRisk FactorsRoleSourceTestingTherapeuticUnited StatesUrineabsorptiondietarydietary controlglyoxylatehealthy volunteerhigh body mass indexlifestyle factorsmalenovel therapeutic interventionobese personrecruitsecondary outcomestable isotopestemtreatment strategyurinary
项目摘要
SUMMARY
The frequency of kidney stones, of which idiopathic calcium oxalate (CaOx) kidney stones are the most common,
is increasing in the United States, affecting 9% of the population. Environmental factors, lifestyle factors, diet
and metabolic or endogenous factors are known to play a role in the risk of kidney stone disease. Urinary oxalate
excretion influences risk of CaOx kidney stone formation and is derived from both dietary oxalate intake and
endogenous oxalate synthesis. Studies have addressed the contribution of dietary oxalate to urinary oxalate
excretion in healthy subjects, and demonstrated that dietary contribution can vary between 20 to 50%. However,
studies examining the importance of endogenous oxalate synthesis are lacking for patients with CaOx stone
disease. Obesity is linked to CaOx kidney stone risk and may influence urinary oxalate excretion, although the
underlying mechanisms are unknown. Strategies for treatment and prevention of CaOx kidney stones and
research into new treatments would benefit from a better understanding of the sources of endogenous oxalate
synthesis. The current proposal aims to determine if calcium oxalate kidney stone formers and subjects with
obesity have increased rates of endogenous oxalate synthesis compared with healthy volunteers with normal
BMI. An accurate measurement of endogenous oxalate synthesis will be performed using primed, steady-state,
continuous intravenous infusion of the stable isotope of oxalate, 13C2-oxalate, and analysis by ion
chromatography coupled with mass spectrometry, in subjects on a controlled low oxalate diet. 24-hr urinary
oxalate excretions collected on a low oxalate, controlled diet will be compared with the measurement of the
endogenous oxalate synthesis rate calculated by the continuous 13C2-oxalate intravenous infusion method. This
comparison will determine if the utilization of a low oxalate diet and collection of 24 hour urine is an appropriate
and easier approach to assess endogenous oxalate synthesis. The results of this pilot study will form the basis
for a future R01 application to, 1), test the hypothesis that CaOx kidney stone formers have increased
endogenous oxalate synthesis, 2), test the hypothesis that obesity enhances endogenous oxalate synthesis,
and, 3), identify sources of endogenous oxalate synthesis that are altered in obese individuals and those with
CaOx kidney stone disease, which in turn may lead to the development of novel therapeutic approaches to
decrease urinary oxalate excretion.
概括
肾结石的频率,其中特发性草酸钙(CAOX)肾结石是最常见的
美国正在增加,影响9%的人口。环境因素,生活方式因素,饮食
已知代谢或内源性因素在肾脏疾病的风险中发挥作用。草酸盐
排泄会影响Caox肾结石的风险,并源自饮食中草酸盐的摄入量和
内源性草酸盐合成。研究已经解决了草酸饮食中草酸盐的贡献
在健康受试者中极端,并证明饮食贡献可能在20%至50%之间变化。然而,
缺乏研究内源性草酸盐合成重要性的研究对Caox石头患者缺乏
疾病。肥胖与Caox肾结石风险有关,可能会影响草酸尿酸排泄,尽管
潜在机制是未知的。治疗和预防Caox肾结石的策略和
对新疗法的研究将受益于对内源性草酸盐来源的更好理解
合成。当前的提案旨在确定草酸钙肾脏石材形成器和受试者是否具有
与正常的健康志愿者相比
BMI。将使用Primed,steady-State,
连续静脉注射草酸盐,13c2-Oxalate的稳定同位素和离子分析
色谱与质谱法结合在控制低草酸盐饮食的受试者中。 24小时尿
在低氧酸盐,受控饮食上收集的草酸盐极端将与测量
通过连续13c2-氧化静脉输注法计算出的内源性草酸盐合成速率。这
比较将确定低氧饮食的利用和尿液收集24小时是合适的
并更容易评估内源性草酸盐合成的方法。该试点研究的结果将形成低音
对于未来的R01应用程序,1)检验了Caox肾结石增加的假设
内源性草酸盐合成,2),检验了肥胖增强内源性草酸合成的假设,
3),确定肥胖个体和患有的那些人的内源性草酸盐合成来源
Caox肾脏石材疾病,这又可能导致新的治疗方法发展
减少草酸盐排泄。
项目成果
期刊论文数量(0)
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{{ truncateString('Sonia Fargue', 18)}}的其他基金
Assessment of Endogenous Oxalate Synthesis in Calcium Oxalate Kidney Stone Formers and Healthy Individuals
草酸钙肾结石形成者和健康个体内源性草酸盐合成的评估
- 批准号:
10453681 - 财政年份:2021
- 资助金额:
$ 9.97万 - 项目类别:
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