Parkinson Disease Neural Circuitry and Gastrointestinal Pathobiology

帕金森病神经回路和胃肠道病理学

• 批准号: 10740119
• 负责人: MICHAEL L. CAMILLERI
• 金额: $ 58.43万
• 依托单位: MAYO CLINIC ROCHESTER
• 依托单位国家: 美国
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-01 至 2027-05-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10740119
• 关键词: Acceleration; Address; Age; Aging; Animal Model; Attention; Autonomic Dysfunction; Autonomic Pathways; Biochemical; Braak' s hypothesis; Brain; Brain Stem; Cell Nucleus; Central Nervous System; Cerebral cortex; Clinic; Clinical; Clinical Trials; Cognitive; Colon; Constipation; Control Groups; Corpus striatum structure; Deglutition Disorders; Dopamine; Dopamine Receptor; Duodenum; Educational workshop; Elderly; Enteral; Enteric Nervous System; Enteroendocrine Cell; Functional disorder; Future; Gastric Emptying; Gastroenterology; Gastrointestinal Transit; Gastrointestinal tract structure; Gut Mucosa; Human; Image; Impaired cognition; Individual; Infectious Agent; Inflammation; Intervention; Intestinal permeability; Intestines; Investigation; Literature; Molecular; Motor; Mucous Membrane; Nausea; Nerve; Nerve Degeneration; Nervous System; Neurodegenerative Disorders; Neurons; Parkinson Disease; Pathologic; Pathway interactions; Patients; Permeability; Persons; Pharmaceutical Preparations; Phenotype; Physiological; Poison; Prevention; Process; Prospective cohort; Proteins; Quality of life; Questionnaires; Research Design; Role; Short-Term Memory; Sigmoid colon; Small Intestines; Specificity; Squalamine; Stomach; Submucosa; Symptoms; Tight Junctions; Time; Tissues; Travel; United States National Institutes of Health; Vagus nerve structure; absorption; alpha synuclein; basal forebrain; cell motility; cognitive impairment in Parkinson' s; density; design; dopamine transporter; dopaminergic neuron; dorsal motor nucleus; fecal microbiome; gastrointestinal; gastrointestinal function; gastrointestinal symptom; gut microbiota; gut-brain axis; improved; in vivo; intestinal epithelium; microbiome; motility disorder; motor disorder; motor symptom; multidisciplinary; neural; neural circuit; neurotoxic; occludin; preclinical study; prospective; protein misfolding; receptor density; receptor expression; single photon emission computed tomography; synucleinopathy; transcriptome

Gastrointestinal (GI) symptoms are significant non-motor manifestations of Parkinson disease (PD) that can precede PD motor symptoms by years; cognitive dysfunction is an important late, non-motor manifestation. Braak’s hypothesis proposes that α-synuclein (αS) aggregates propagate along vagal or olfactory afferents to the central nervous system (CNS), leading to motor and non-motor features of PD. However, αS aggregates are also identified in enteric neurons in elderly people without PD. Squalamine prevention of αS aggregates improved constipation in PD. Density of nigrostriatal dopamine transporters (as assessed by 123I-FP-CIT SPECT) are relevant to cognitive processing in PD. αS oligomers in CSF is a marker of early synucleinopathies and αS protein misfolding in PD implies propagation from the gut to brainstem via the vagus nerve. The relationship between density of nigrostriatal dopamine or aS misfolding in gastrointestinal mucosa and the GI pathophysiology in human PD is unknown. To date, prior studies have typically addressed one pathological mechanism and one GI manifestation. Our multidisciplinary characterization of GI and neural phenotype in PD is key for this first study in 3 groups of humans of the mechanistic roles of the central neural circuitry, central dopamine receptors’ density, autonomic pathways, as well as αS expression in the gastrointestinal and colonic mucosa and microbiome in gut pathophysiology in human PD. Our overall hypothesis is that reduced nigrostriatal dopamine transmitter, autonomic dysfunction and increased αS expression or misfolding in the gastric, duodenal or sigmoid mucosa are associated with abnormal GI motor and barrier functions and with submucosal neuronal dopamine and αS expression in patients with PD with GI symptoms. We propose a prospective cohort design study with two aims in 3 groups, that is, PD patients with Hoehn and Yahr motor stages 1-3 with/without GI symptoms, and age-matched controls with n=24 per group: Aim 1: To compare GI motor functions (gastric emptying and accommodation, colonic transit, defecatory function), small bowel permeability, duodenal and stool microbiome and putative mechanisms (GI and sigmoid mucosal transcriptome, including αS misfolding, tight junction protein, and dopamine receptor expression). Aim 2: To quantitate nigrostriatal dopamine transporter expression, autonomic symptoms, and vagal and sympathetic functions using validated 123I-FP-CIT SPECT, COMPASS-31 questionnaires, and CASS scores, respectively and compare the central dopamine transporter expression and autonomic functions In sub-aims, we compare central and autonomic functions, GI transit and permeability, and mucosal αS mucosal expression or mis-folding in the 3 groups. The significance of the proposal lies in identification of mechanisms, and potential targets for future interventions directed to vagal and autonomic dysfunction, aggregation or misfolding of αS in gut mucosa, as well as dopamine expression to treat GI manifestations of PD.

胃肠道(GI)症状是帕金森病(PD)的重要非运动性表现，可先于PD运动症状多年；认知功能障碍是一种重要的晚期非运动性表现。布拉克的假说认为，α-突触核蛋白(αS)聚集体沿着迷走神经或嗅觉传入中枢神经系统(CNS)传播，导致帕金森病的运动和非运动特征。然而，在没有帕金森病的老年人的肠神经元中也发现了αS聚集体。角鲨胺预防αS可改善PD患者便秘。黑质纹状体多巴胺转运体的密度(通过123I-FP-CIT SPECT评估)与帕金森病患者的认知处理有关。脑脊液中的αS寡聚体是早期突触核病的标志物，而帕金森病患者的αS蛋白错误折叠提示通过迷走神经从肠道传播到脑干。帕金森病患者胃肠粘膜黑质纹状体多巴胺或AS错误折叠的密度与胃肠道病理生理的关系尚不清楚。到目前为止，以前的研究通常只涉及一种病理机制和一种胃肠道症状。我们对帕金森病患者GI和神经表型的多学科表征是首次在3组人中研究中枢神经回路、中枢多巴胺受体密度、自主神经通路以及αS在胃肠和结肠粘膜中的表达以及肠道病理生理学中微生物组的机制的关键。我们的总体假设是，在有GI症状的PD患者中，黑质纹状体多巴胺递质减少、自主神经功能障碍、胃、十二指肠或乙状结肠黏膜αS表达增加或错误折叠与GI运动和屏障功能异常以及粘膜下神经元多巴胺和αS表达相关。我们提出了一项前瞻性队列研究，将两个目标分为三组，即具有Hoehn和Yahr运动期1-3级且有或没有胃肠道症状的PD患者，以及年龄匹配的对照组，每组24人： 目的：比较胃肠运动功能(胃排空调节、结肠运输、排便功能)、小肠通透性、十二指肠和粪便微生物组及可能的机制(胃肠道和乙状结肠黏膜转录组，包括αS错误折叠、紧密连接蛋白和多巴胺受体的表达)。 目的：分别使用验证的123I-FP-CIT SPECT、COMPASS-31问卷和CASS评分来量化黑质纹状体多巴胺转运体的表达、自主神经症状、迷走神经和交感神经功能，并比较中枢多巴胺转运体的表达和自主神经功能 在次级目标中，我们比较了3组的中枢和自主神经功能、胃肠道转运和通透性以及粘膜αS粘膜的表达或错折叠。该建议的意义在于识别机制，以及未来针对迷走神经和自主神经功能障碍的干预的潜在靶点，肠粘膜中αS的聚集或错误折叠，以及多巴胺的表达，以治疗PD的胃肠道表现。