Roles of Gsh1 & Gsh2 in Telencephalic Neurogenesis

Gsh1 的作用

• 批准号: 7532620
• 负责人: KENNETH J CAMPBELL
• 金额: $ 32.81万
• 依托单位: CINCINNATI CHILDRENS HOSP MED CTR
• 依托单位国家: 美国
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7532620
• 关键词: Address; Adult; Animals; Astrocytes; Attention deficit hyperactivity disorder; Birth; Brain; Brain Diseases; Brain region; Cell Cycle; Cell Differentiation process; Cells; Characteristics; Cognition; Corpus striatum structure; Dementia; Development; Dorsal; Dyskinetic syndrome; Embryo; Embryonic Development; GLAST Protein; Generations; Genes; Genetic; Gilles de la Tourette syndrome; Glial Differentiation; Goals; Hippocampus (Brain); Homeobox; Homeobox Genes; Huntington Disease; In Vitro; Interneurons; Knowledge; Lateral; Maintenance; Maps; Molecular; Morus; Movement; Mus; Neurodegenerative Disorders; Neurodevelopmental Disorder; Neurons; Numbers; Obsessive-Compulsive Disorder; Oligodendroglia; Parkinson Disease; Pathway interactions; Perinatal; Phenotype; Play; Population; Process; Public Health; Recovery; Regulation; Replacement Therapy; Repression; Research; Rodent; Role; Schedule; Sister; Specific qualifier value; Staging; Staining method; Stains; Stem cells; Stream; Structure; System; Tamoxifen; Telencephalon; Testing; Thinking; Time; Transgenic Organisms; Tubulin; Ventricular; Week; Work; cell type; cellular engineering; design; mutant; nerve stem cell; neurogenesis; olfactory bulb; postnatal; progenitor; putamen; recombinase; repaired; transcription factor

DESCRIPTION (provided by applicant): The mammalian telencephalon represents the region of the brain that displays the most cellular diversity, particularly with respect to neuronal subtypes. One likely mechanism for generating this diversity is its protracted schedule of neurogenesis. Indeed, telencephalic neurogenesis continues postnatally and even into adulthood, at least in the olfactory bulb and hippocampus. This proposal will examine the role of two homeobox genes, Gsh1 and Gsh2 and their role in the neurogenesis of striatal projection neurons and olfactory bulb interneurons. While striatal neurogenesis occurs exclusively at embryonic time points, olfactory bulb interneurons are generated at both embryonic and postnatal stages. Recent work has found that Gsh2-expressing progenitors also give rise to oligodendrocytes at perinatal stages, this correlates with the period when Gsh2 is down-regulating. We hypothesize that Gsh genes promote neurogenesis in the embryonic and postnatal brain while repressing oligodendrocyte development. The four aims in this proposal are designed to address this hypothesis. The first aim, will examine the time windows in which Gsh2 specifies striatal projection neuron progenitors and their olfactory bulb interneuron counterparts as well as it negative regulation of oligodendrocyte specification during embryogenesis. The second aim will examine the role of Gsh1 in promoting differentiation of telencephalic progenitors. Aim 3 will examine the role of Mash1 and Dlx1/2 genes down-stream of Gsh2 in telencephalic development. Finally, aim 4 will examine the requirement for Gsh genes in regulating neurogenesis and oligodendrogenesis within the postnatal subventricular zone. Certain neurodevelopmental disorders such as Tourette's syndrome, attention deficit hyperactivity disorder (ADHD) and obsessive compulsive disorder (OCD) are thought to result at least in part from abnormal function/development of the striatum. Additionally, the fact that olfactory bulb interneurons are generated into adulthood has made their progenitors attractive candidates for cellular engineering and cell replacement therapies. Thus greater knowledge of striatal and olfactory bulb development and the specific roles that Gsh genes play in these processes is likely to provide a better understanding of certain brain disorders and possible brain repair strategies. PUBLIC HEALTH RELEVANCE: The telencephalon represents the region of the brain most concerned with cognition and voluntary movement. One of the major telencephalic structures controlling these processes is the striatum (also known as the caudate-putamen). Malfunction of the striatum occurs in a number of neurodegenerative disorders such as Parkinson's disease and Huntington's chorea, leading to abnormal movements and in some cases dementia. Moreover, certain neurodevelopmental disorders, such as Tourette's syndrome, attention deficit hyperactivity disorder (ADHD) and obsessive compulsive disorder (OCD) have been suggested to result from malfunction and/or altered development of the striatum. The embryonic region that gives rise to the striatal projection neurons also produces interneurons that migrate rostrally to the olfactory bulb. Unlike the striatal projection neurons, the olfactory bulb interneurons are continuously produced throughout the lifetime of the animal. This fact has led to a growing field of research, which is attempting to isolate and characterize the neural stem cells that generate these neurons in the adult brain. The hope of these studies is that the stem cells could be used for cell replacement strategies in certain neurodegenerative diseases (e.g. Parkinson's and Huntington's disease). Little is known, however, about the specification of either striatal projection neurons or olfactory bulb interneurons. Thus greater knowledge as to the molecular mechanisms (e.g. Gsh1 and Gsh2) underlying the generation of these two neuronal subtypes is likely to contribute to a better understanding of the above mentioned brain disorders as well as providing possibilities for brain repair strategies.

描述(申请人提供)：哺乳动物端脑代表大脑中显示最多细胞多样性的区域，特别是关于神经元亚型。产生这种多样性的一个可能机制是它旷日持久的神经发生时间表。事实上，端脑神经发生在出生后持续，甚至持续到成年，至少在嗅球和海马体中是这样。这项建议将研究两个同源框基因Gsh1和Gsh2的作用，以及它们在纹状体投射神经元和嗅球中间神经元神经发生中的作用。虽然纹状体神经发生只发生在胚胎时间点，但嗅球中间神经元在胚胎和出生后阶段都会产生。最近的工作发现，表达Gsh2的祖细胞也会在围产期产生少突胶质细胞，这与Gsh2下调的时期有关。我们假设GSH基因促进胚胎和出生后大脑中的神经发生，同时抑制少突胶质细胞的发育。这项提议的四个目标就是为了解决这一假设。第一个目标，将研究Gsh2指定纹状体投射神经元前体细胞和它们的嗅球间神经元之间对应的时间窗口，以及它在胚胎发育过程中对少突胶质细胞规格的负调控。第二个目的是研究Gsh1在促进端脑祖细胞分化中的作用。目的3将研究Gsh2下游的Mash1和Dlx1/2基因在端脑发育中的作用。最后，目标4将研究GSH基因在调节出生后脑室下区神经发生和少突胶质细胞发生中的需求。某些神经发育障碍，如抽动症、注意缺陷多动障碍(ADHD)和强迫症(OCD)，被认为至少部分是由于纹状体功能/发育异常造成的。此外，嗅球中间神经元是在成年期生成的，这一事实使它们的祖细胞成为细胞工程和细胞替代疗法的候选细胞。因此，更多地了解纹状体和嗅球发育以及GSH基因在这些过程中扮演的特定角色，可能会更好地了解某些大脑疾病和可能的大脑修复策略。与公共健康相关：端脑代表大脑中与认知和自愿运动最相关的区域。控制这些过程的主要端脑结构之一是纹状体(也称为尾壳核)。纹状体功能障碍会出现在许多神经退行性疾病中，如帕金森氏病和亨廷顿舞蹈症，导致运动异常，在某些情况下还会导致痴呆症。此外，某些神经发育障碍，如抽动症、注意缺陷多动障碍(ADHD)和强迫症(OCD)，被认为是纹状体功能障碍和/或发育改变的结果。产生纹状体投射神经元的胚胎区也产生中间神经元，这些中间神经元从嘴部迁移到嗅球。与纹状体投射神经元不同，嗅球中间神经元在动物的一生中不断产生。这一事实导致了越来越多的研究领域，试图分离和鉴定在成人大脑中产生这些神经元的神经干细胞。这些研究的希望是，干细胞可以用于某些神经退行性疾病(如帕金森氏症和亨廷顿病)的细胞替代策略。然而，关于纹状体投射神经元或嗅球中间神经元的规范，人们知之甚少。因此，更多地了解这两种神经元亚型产生的分子机制(例如Gsh1和Gsh2)可能有助于更好地理解上述大脑疾病，并为脑修复策略提供可能性。