Sexually dimorphic miR-497 regulates alpha-synuclein and alpha-synucleinopathy

性二态性 miR-497 调节 α-突触核蛋白和 α-突触核蛋白病

• 批准号: 8638195
• 负责人: PETER T. NELSON
• 金额: $ 22.5万
• 依托单位: UNIVERSITY OF KENTUCKY
• 依托单位国家: 美国
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-25 至 2015-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8638195
• 关键词: Age; Age-Years; Alzheimer' s Disease; Area; Attenuated; Autopsy; Biochemical; Biochemical Pathway; Biological Markers; Brain; Cells; Cessation of life; Clinical; Cultured Cells; Data; Data Analyses; Data Set; Databases; Dementia; Deposition; Diagnostic; Disease; Elderly; Female; Gender; Gene Dosage; Gene Expression; Genes; Goals; Human; Knowledge; Lentivirus Vector; Lewy Bodies; Lewy Body Dementia; Methods; MicroRNAs; Molecular; Neurodegenerative Disorders; Neurons; PARK7 gene; Pathogenesis; Pathology; Patients; Proteins; Public Health; Rattus; Regulation; Regulator Genes; Reporting; Research Personnel; Risk; Role; Sampling; Series; Small RNA; System; Testing; Therapeutic; Viral; Woman; age group; alpha synuclein; alpha synuclein gene; base; combat; data registry; disease diagnosis; high risk; male; men; neocortical; nervous system disorder; neurochemistry; novel; novel diagnostics; novel therapeutics; public health relevance; pup; research study; sex; synucleinopathy; trend

DESCRIPTION (provided by applicant): Dementia with Lewy bodies (DLB) is a devastating neurodegenerative disease. Cortical Lewy body pathology (LBP), which is the pathological substrate of DLB, is observed in 10%-30% of brains in most autopsy series of dementia patients. At the molecular level, LBP consists of aberrant deposits of alpha-synuclein (alpha-SN) protein and there is evidence that increased alpha-SN gene dosage is seen in some cases of DLB. The biochemical pathways that contribute to LBP are poorly understood and our overall goal is to help fill this knowledge gap. Men have strongly (~three-fold) increased risk for developing autopsy-confirmed cortical LBP compared to women; this is an observation replicated in many autopsy series. Our overarching hypothesis is that a particular microRNA (miRNA; miR-497) contributes to sexually-dimorphic DLB pathogenesis. In preliminary studies we made the following observations: miR-497 is expressed sexually dimorphically in human brain and in rat primary cultured neurons; miR-497 is enriched in human brains with LBP and in LBP- vulnerable brain areas; and, miR-497 expression in cultured cells alters alpha-SN and DJ-1/PARK7 expression. Our lab has expertise in both LBP and miRNAs which enable us to test the hypothesis that miR- 497 regulates alpha-SN expression and may influence LBP in a sexually dimorphic manner. Specific Aim 1: Test the hypothesis that miR-497 is sexually dimorphically expressed in human brain, and dysregulated in human brains with LBP. Proposed studies will represent the state of the art in miRNA profiling using miRNA microarrays to test for associations between miRNA expression and both LBP and gender status. Preliminary data indicate a systematic tendency for sexually dimorphic miR-497 to be dysregulated in brains with LBP and in human brain areas vulnerable to LBP. Specific Aim 2: Test the hypothesis that sexually dimorphic miR-497 regulates alpha-SN expression. Preliminary data indicate that miR-497 regulates alpha-SN. Primary rat neurons will be transduced with lentiviral vectors expressing miR-497 versus other control miRNAs to test the hypothesis that miR-497 regulates alpha-SN. Further experiments in these cells will query whether the regulation of alpha-SN by miR- 497 is direct or via an intermediate regulation of PARK7/DJ-1 gene. Following viral transduction with miR-497 and control miRNAs, we will determine the full list of miR-497 targets in cultured primary neurons. These mechanistic experiments will aid our ultimate goal of therapies to combat this currently untreatable disease. Public health significance: Understanding how sexually dimorphic miR-497 alters alpha-SN expression to induce sex-dimorphic pathology would be a major novel paradigm in neurochemistry with clinical/translational significance for both diagnostic and therapeutic strategies. The primary cel culture system will offer an experimental paradigm for testing novel methods of attenuating the dimorphic expression of miR-497 that drives alpha-SN expression.

描述（由申请人提供）：路易体痴呆（DLB）是一种破坏性神经退行性疾病。在大多数痴呆患者的尸检系列中，在10%-30%的脑中观察到皮质路易体病理（LBP），其是DLB的病理基质。在分子水平上，LBP由α-突触核蛋白（α-SN）蛋白的异常沉积物组成，并且有证据表明在某些DLB病例中观察到α-SN基因剂量增加。导致LBP的生化途径知之甚少，我们的总体目标是帮助填补这一知识空白。与女性相比，男性发生尸检证实的皮质LBP的风险显著增加（约3倍）;这是在许多尸检系列中重复的观察结果。我们的总体假设是，一种特定的microRNA（miRNA; miR-497）有助于性别二态性DLB发病机制。在初步研究中，我们进行了以下观察：miR-497在人脑和大鼠原代培养的神经元中以性二态的方式表达; miR-497在具有LBP的人脑和LBP-脆弱的脑区域中富集;并且，培养细胞中的miR-497表达改变了α-SN和DJ-1/PARK 7表达。我们的实验室在LBP和miRNAs方面都有专业知识，这使我们能够测试miR- 497调节α-SN表达并可能以性别二型方式影响LBP的假设。具体目的1：检验miR-497在人脑中以性二态表达，并在LBP人脑中失调的假设。拟议的研究将代表使用miRNA微阵列检测miRNA表达与LBP和性别状态之间的关联的miRNA谱分析的最新技术水平。初步数据表明，性二态性miR-497在患有LBP的大脑和易受LBP影响的人类大脑区域中存在系统性失调趋势。具体目标2：检验性二态性miR-497调节α-SN表达的假设。初步数据表明，miR-497调节α-SN。原代大鼠神经元将用表达miR-497与其他对照miRNA的慢病毒载体转导，以测试miR-497调节α-SN的假设。在这些细胞中的进一步实验将询问miR- 497对α-SN的调节是直接的还是通过PARK 7/DJ-1基因的中间调节。在用miR-497和对照miRNA进行病毒转导后，我们将确定培养的原代神经元中miR-497靶标的完整列表。这些机械实验将有助于我们治疗这种目前无法治愈的疾病的最终目标。公共卫生意义：了解性二态性miR-497如何改变α-SN表达以诱导性二态性病理学将是神经化学中的一个主要新范式，对诊断和治疗策略具有临床/转化意义。原代细胞培养系统将提供用于测试减弱驱动α-SN表达的miR-497的二态表达的新方法的实验范例。