Effect of Early-Life Exposure to Metal Mixtures on Lung Function and Mitochondrial DNA in Children

生命早期接触金属混合物对儿童肺功能和线粒体 DNA 的影响

• 批准号: 10609404
• 负责人: Muhammad F Parvez
• 金额: $ 54.8万
• 依托单位: COLUMBIA UNIVERSITY HEALTH SCIENCES
• 依托单位国家: 美国
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-04-02 至 2025-03-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10609404
• 关键词: Adult; Affect; Age; Animals; Arsenic; Bangladesh; Biological; Biological Markers; Biosensor; Blood; Bronchodilator Agents; Cadmium; Child; Child Health; Childhood; Collection; Data; Data Correlations; Development; Disease; Elderly; Environmental Pollutants; Exposure to; Goals; Health; Health Policy; Human; Impairment; Individual; Infrastructure; Intervention; Lead; Life; Link; Longitudinal Studies; Lung; Lung diseases; Manganese; Measurable; Measurement; Measures; Mediating; Mediation; Metal exposure; Metals; Methods; Mitochondria; Mitochondrial DNA; Modeling; Outcome; Oxidative Stress; Physiological; Predisposition; Pregnancy; Pregnant Women; Process; Property; Prospective cohort; Public Health; Pulmonary Function Test/Forced Expiratory Volume 1; Pulmonary function tests; Research; Risk; Risk Factors; Sampling; Structure; Superfund; Time; Tooth structure; Toxic effect; Trees; Universities; Vital capacity; aged; blood-based biomarker; capsule; cost; cost efficient; deciduous tooth; early childhood; early life exposure; global health; improved; in utero; innovation; lung development; metal poisoning; mitochondrial DNA alteration; mitochondrial dysfunction; novel; oxidation; oxidative DNA damage; oxidative damage; prenatal; programs; pulmonary function; repaired; response; statistics; time use; tool; toxic metal

PROJECT SUMMARY Exposure to harmful toxic metals in utero and during early life is a global health problem. Although millions of children worldwide are exposed to multiple metals at those times, we still lack convincing evidence of the impact of metal exposure, particularly mixtures of metals, on childhood lung function. Indeed, most studies investigated metals individually, but in real life, pregnant women and their children are exposed to many metals simultaneously, and their combined effects are often unpredictable. Because the human lung develops through a sequence of highly choreographed processes, ideally, human studies would continuously measure levels of multiple metals to identify relevant windows of susceptibility. In this study, we will obtain weekly measurements of multiple metal exposures simultaneously by using a highly innovative method to measure metal levels in deciduous teeth. Like trees, teeth develop in layers that trap metals at concentrations commensurate with exposure levels. Hence, each layer is like a time capsule that contains metal levels from the time it was formed. We will use a validated method to measure 14 metals in teeth. We can assess exposures cumulatively, as well as at discrete week-by-week developmental windows, starting prenatally as early as gestational weeks 13-16 up to the time of tooth collection (~6 years). In order to develop a noninvasive and inexpensive biomarker for later-life lung function, we will combine our analyses of these metal assessments in teeth with novel blood-based biomarkers that leverage the unique properties of the mitochondrial DNA (mtDNA), a cumulative biosensor of metal-induced oxidative DNA damage. Our goal is to use tooth-based, time-specific measures of metals to assess their effects on lung function individually or as a mixture. We hypothesize that metals adversely affect lung function and that the effects of metal exposures on children’s lungs are associated with the cumulative damage measured in blood mtDNA. We can time- and cost-effectively conduct this research by leveraging the infrastructure of the Health Effects of Arsenic Longitudinal Study (HEALS), a well-characterized prospective cohort of 35,000 adults and their children in Araihazar, Bangladesh. The proposed study will include 600 children ages 6-10 years. We will collect at least one deciduous tooth sample from each child and conduct standard lung function tests and obtain blood mtDNA measures twice, 2 years apart. We anticipate that findings from this innovative and cost-efficient study will generate information on the impact of in utero and early-life exposure to multiple metals on pulmonary function in children. Information generated from this study will appreciably improve our understanding of lung function in response to environmental metal exposure and ultimately will inform strategies to improve lung function in children.

项目总结