Coordination of orofacial and respiratory movements

口面部和呼吸运动的协调

• 批准号: 7760979
• 负责人: DETLEF H HECK
• 金额: $ 32.05万
• 依托单位: UNIVERSITY OF TENNESSEE HEALTH SCI CTR
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-03-01 至 2013-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7760979
• 关键词: Acute; Affect; Area; Behavior; Behavioral; Brain Stem; Breathing; Cerebellar Ataxia; Cerebellar Diseases; Cerebellar Nuclei; Cerebellar cortex structure; Cerebellar vermis structure; Cerebellum; Clinical; Coughing; Data; Deglutition; Deglutition Disorders; Dysarthria; Food; Functional disorder; Generations; Health; Human; Ingestion; Inherited; Injection of therapeutic agent; Link; Liquid substance; Lurcher Mouse; Maps; Measurement; Measures; Modeling; Monitor; Motor; Movement; Mus; Muscimol; Nervous system structure; Neurons; Nucleus fastigii; Output; Oxygen; Patients; Pattern; Play; Population; Posture; Purkinje Cells; Research; Respiration; Role; Sensory; Sneezing; Speech; Speech Disorders; Stereotyping; Stimulus; Sudden infant death syndrome; Testing; Tracer; Vibrissae; Wild Type Mouse; awake; base; cerebellar lesion; improved; neural circuit; neuroregulation; orofacial; public health relevance; research study; respiratory

DESCRIPTION (provided by applicant): Ingestion of food and fluids are as integral to survival as is breathing oxygen, and it is not surprising that neural control substrates for both orofacial and respiratory movements are organized within pattern generating circuits in the brainstem. Constant coordination of these rhythmic movements is essential, and deficits in coordinating orofacial and respiratory movements are implicated in human health conditions such as sudden infant death syndrome (SIDS), swallowing dysfunction (dysphagia) and speech disorders (dysarthria). The cerebellum has long been implicated in the coordination of body movements and posture. Clinical evidence has also linked cerebellar dysfunction to SIDS, dysphagia and dysarthria but the neuronal mechanisms through which the cerebellum controls or coordinates respiratory and orofacial movements has yet to be determined. We have developed a new experimental paradigm that allows us to simultaneously measure orofacial (whisking and licking) and respiratory movements in awake behaving mice while recording neuronal activity in the cerebellum and brainstem. The highly stereotyped licking and whisking movements are in many respects ideal model behaviors for the study of cerebellar motor coordination. They are natural behaviors spontaneously performed in large numbers and easy to measure and quantify. Our preliminary experiments in awake behaving normal and ataxic mice show that respiration is well coordinated with whisking and licking in normal but not in ataxic mice. Here we propose to determine how licking, whisking and respiratory movements are coordinated in awake behaving mice, what role the cerebellum plays in this task and what neural circuitry is involved in this control. We hypothesize that the cerebellum coordinates the activities of brainstem pattern generators which generate respiratory and rhythmic orofacial movements. Three specific aims will test this hypothesis: Aim 1: Test the hypothesis that the precise temporal coordination between orofacial and respiratory movements is disrupted in mice with cerebellar ataxia. The coordination of orofacial and respiratory movements will be determined under different behavioral conditions in normal and ataxic mice and in normal mice during reversible inactivation of the deep cerebellar nuclei (DCN) through muscimol injections. Aim 2: Test the hypothesis that cerebellum and deep cerebellar nuclei neuronal activity is highly coordinated with orofacial and respiratory movements. We will use extracelluar recordings to map the neuronal representation of orofacial and respiratory movements in the cerebellum and deep cerebellar nuclei in normal and sensory deafferented mice under different behavioral conditions. Aim 3: Test the hypothesis that the cerebellum, via the fastigial nucleus of the DCN, coordinately controls rhythmic orofacial and respiratory movements via collateralized projections to multiple brainstem CPGs. Preliminary data show that Purkinje cells projecting to the fastigial nucleus (FN) represent multiple orofacial movements and that FN neurons project to multiple brain stem pattern generators. Brainstem tracer injections will be used to determine cerebellar to brainstem pattern generator projections. PUBLIC HEALTH RELEVANCE: Respiratory movements must be coordinated with other movements affecting airflow like speech, coughing, sneezing or swallowing, but how the nervous system achieves the important task of coordinating respiration with other orofacial movements is poorly understood. We have obtained preliminary data suggesting that the cerebellum is critically involved in this task, which could explain why cerebellar patients suffer from speech disorders (dysarthria) and difficulties in swallowing (dysphagia). The proposed studies will improve our general understanding of cerebellar function and particularly its involvement in the important task of coordinating respiration with other airflow-affecting movements.

描述（由申请人提供）：食物和液体的摄入与呼吸氧气一样对于生存来说是不可或缺的，因此口面部和呼吸运动的神经控制基质被组织在脑干的模式生成回路内也就不足为奇了。这些有节奏的运动的持续协调至关重要，口面部和呼吸运动协调的缺陷与人类健康状况有关，例如婴儿猝死综合症（SIDS）、吞咽功能障碍（吞咽困难）和言语障碍（构音障碍）。小脑长期以来一直与身体运动和姿势的协调有关。临床证据也表明小脑功能障碍与 SIDS、吞咽困难和构音障碍有关，但小脑控制或协调呼吸和口面部运动的神经机制尚未确定。我们开发了一种新的实验范式，使我们能够同时测量清醒行为小鼠的口面部（拂动和舔舐）和呼吸运动，同时记录小脑和脑干的神经元活动。高度刻板的舔舐和搅拌动作在许多方面都是研究小脑运动协调的理想模型行为。它们是大量自发进行的自然行为，易于测量和量化。我们对清醒行为的正常小鼠和共济失调小鼠的初步实验表明，正常小鼠的呼吸与搅拌和舔舐能很好地协调，但共济失调小鼠则不然。在这里，我们建议确定清醒行为小鼠的舔舐、拂动和呼吸运动是如何协调的，小脑在这项任务中扮演什么角色，以及哪些神经回路参与了这种控制。我们假设小脑协调脑干模式发生器的活动，从而产生呼吸和有节奏的口面部运动。三个具体目标将检验这一假设： 目标 1：检验以下假设：患有小脑性共济失调的小鼠口面部和呼吸运动之间的精确时间协调受到破坏。正常小鼠和共济失调小鼠以及正常小鼠在通过注射蕈醇注射可逆性小脑深部核团（DCN）失活期间，将在不同行为条件下确定口面部和呼吸运动的协调。目标 2：检验小脑和小脑深核神经元活动与口面部和呼吸运动高度协调的假设。我们将使用细胞外记录来绘制不同行为条件下正常小鼠和感觉传入神经障碍小鼠小脑和小脑深部核团口面和呼吸运动的神经元表征。目标 3：检验以下假设：小脑通过 DCN 的顶核，通过对多个脑干 CPG 的侧支投射来协调控制有节奏的口面和呼吸运动。初步数据表明，投射到顶核（FN）的浦肯野细胞代表多种口面部运动，并且 FN 神经元投射到多个脑干模式发生器。脑干示踪剂注射将用于确定小脑到脑干模式发生器的预测。公共卫生相关性：呼吸运动必须与其他影响气流的运动（如言语、咳嗽、打喷嚏或吞咽）协调一致，但神经系统如何完成协调呼吸与其他口面部运动的重要任务却知之甚少。我们获得的初步数据表明小脑在这项任务中发挥着至关重要的作用，这可以解释为什么小脑患者患有言语障碍（构音障碍）和吞咽困难（吞咽困难）。拟议的研究将提高我们对小脑功能的总体理解，特别是它参与协调呼吸与其他影响气流的运动的重要任务。