Interplay between Mitochondrial DNA Haplogroups, Mitochondrial Function, Oxidative Stress, and Hypertension

线粒体 DNA 单倍群、线粒体功能、氧化应激和高血压之间的相互作用

• 批准号: 10688822
• 负责人: michele k evans
• 金额: $ 13.28万
• 依托单位: NATIONAL INSTITUTE ON AGING
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10688822
• 关键词: Affect; African; African American; African American population; Age; Aging; Baltimore; Blood Circulation; Cardiovascular Diseases; Caucasians; Cell Line; Cells; Cities; Cohort Studies; Complementarity Determining Regions; DNA; DNA Damage; DNA Sequence; DNA copy number; Data; Development; Disease; Follow-Up Studies; Gene Expression; Genes; Genetic Polymorphism; Genetic Recombination; Genetic Transcription; Haplogroup; Haplotypes; Health; Histones; Human; Hypertension; Incidence; Individual; Inflammation; Inherited; Introns; Investigation; Knowledge; Link; Longevity; Longitudinal Studies; Messenger RNA; Mission; Mitochondria; Mitochondrial DNA; Molecular; Morbidity - disease rate; Mutation; Neighborhoods; Nuclear; Oxidative Stress; Participant; Pathway interactions; Pattern; Phylogenetic Analysis; Play; Poly(ADP-ribose) Polymerases; Population; Population Heterogeneity; Poverty; Prevalence; Proteins; Race; Reactive Oxygen Species; Reporting; Research; Research Personnel; Rest; Risk; Risk Factors; Role; Socioeconomic Status; Tissue-Specific Gene Expression; Trees; United States; Untranslated RNA; Variant; Woman; Work; age related; cardiovascular disorder risk; cell community; cell immortalization; cohort; differential expression; ethnic diversity; health disparity; healthy aging; human migration; hypertensive; middle age; mitochondrial dysfunction; mortality; normotensive; novel; oxidative damage; racial and ethnic; racial difference; racial diversity; sensor; sex; social; social health determinants; transcriptome

Thus far, there are few studies that examine the contribution of mtDNA haplogroup to differences in risk factors for age-related health disparities such as in hypertension. The Healthy Aging in Neighborhoods of Diversity across the Life Span (HANDLS) study examines the interaction of race and socioeconomic status on the development of age-associated health disparities among middle-aged AAs and whites residing in Baltimore City. It is possible that population differences in haplogroups could contribute to disparities in mitochondrial function and oxidative stress, and thus contribute to hypertension health disparities. Therefore, we hypothesize that mtDNA haplogroups will influence the presence of age-associated health disparities in hypertension among AAs and whites in the HANDLS cohort and will correlate with mitochondrial health and function. We also predict that mitochondrial health and function will be further influenced by poverty status and other social determinates of health. Establishing whether mtDNA haplogroups influence mitochondrial function and hypertension will contribute to the understanding of population disparities in age-related diseases, and thus this proposal is highly aligned with the NIA mission. Preliminary Results: Previously, we reported racial differences in the transcriptome of HANDLS participants with or without hypertension. Interestingly, in these hypertensive and normotensive women there were significant differential expression in hypertension and inflammation-related mRNAs. In a follow up study of this cohort of women, we found that there were higher levels of the DNA damage sensor protein poly-(ADP-ribose) polymerase 1 (PARP1) in AA women with hypertension compared to normotensive AA women. PARP1 levels were also higher in AA women with hypertension compared to white hypertensive women. Since PARP1 is involved in oxidative stress, these data suggest that differential PARP1 expression might play a role in hypertension-related health disparities. These data indicate that there is differential gene expression by hypertension and race in HANDLS participants, which may influence oxidative stress levels. Importantly, recent research suggests that mtDNA haplogroup can affect both mitochondrial function, transcription of mitochondrial genes, and also nuclear gene expression. However, most studies are performed in immortalized cell lines, especially artificially created cybrid lines. Few studies investigate the changes in mitochondrial function or damage in cells from community-dwelling individuals. In addition, few studies have examined whether hypertension is correlated with a specific mtDNA haplogroup in a racially diverse cohort. Examining the relationship between mtDNA haplogroups, hypertension, and differences in mitochondrial function and oxidative damage will lead to a greater understanding of mitochondrial connection in aging and age-related health disparities. Our specific aims for this project will include: Aim 1: SNP haplotyping of HANDLS cohort of hypertensive participants, Aim 2: Examine the impact of haplogroup on mitochondrial function and oxidative damage in a hypertension subset within the context of race and selected social determinants of health and Aim 3: Examine the impact of haplogroup on oxidative damage to nuclear DNA in a hypertension subset within the context of race and selected social determinants of health.

到目前为止，很少有研究研究mtDNA单倍群对与年龄相关的健康差异（如高血压）的危险因素差异的贡献。整个生命周期（Handls）研究中多样性社区的健康衰老研究研究了种族与社会经济地位在巴尔的摩市的中年AAS和白人之间与年龄相关的健康差异发展的相互作用。单倍群的人口差异可能会导致线粒体功能和氧化应激的差异，从而导致高血压健康差异。因此，我们假设mtDNA单倍群会影响Handls队列中AAS和白人之间与年龄相关的健康差异的存在，并将与线粒体健康和功能相关。我们还预测，线粒体健康和功能将受到贫困状况和其他社会确定性的进一步影响。确定mtDNA单倍群是否影响线粒体功能和高血压将有助于理解与年龄有关的疾病的人口差异，因此该提议与NIA的任务高度一致。 初步结果： 以前，我们报告了患有或没有高血压的Handls参与者的转录组中的种族差异。有趣的是，在这些高血压和正常的女性中，高血压和与炎症相关的mRNA中有显着的差异表达。在对这一妇女队列的后续研究中，我们发现与正常的AA女性相比，AA高血压女性的DNA损伤传感器蛋白聚（ADP-核糖）聚合酶1（PARP1）的水平更高。与白人高血压女性相比，AA高血压女性的PARP1水平也更高。由于PARP1参与氧化应激，因此这些数据表明差异PARP1表达可能在与高血压相关的健康差异中起作用。这些数据表明，Handls参与者中的高血压和种族存在差异基因表达，这可能会影响氧化应激水平。 重要的是，最近的研究表明，mtDNA单倍群可以影响线粒体功能，线粒体基因的转录以及核基因表达。但是，大多数研究都是在永生的细胞系中进行的，尤其是人为地创建的cybrid系。很少有研究研究线粒体功能的变化或社区居住个体细胞的损害。此外，很少有研究检查高血压是否与种族多样的队列中的特定mtDNA单倍群相关。检查mtDNA单倍体，高血压以及线粒体功能的差异和氧化损伤之间的关系将使人们对衰老和与年龄相关的健康差异的线粒体连接有更多了解。 我们对该项目的具体目标将包括：目标1：Handls群体的SNP单倍分型，目的2：检查单倍群对线粒体功能的影响和高血压子集中的我们的氧化性损害和氧化性损害在健康和选择的社会决定因素的背景下，请检查社会对单倍型的影响，氧化型的影响，并选择了氧化型的影响，而氧化型的影响是氧化型的影响。 健康。