Impacts of Spinal Cord Injury on Autonomic Neurons Responsible for Bladder Function

摘要(与原始应用程序相同) 控制排尿反射的回路由控制平滑膀胱的自主神经组成。 控制外尿路骨骼肌的肌肉(逼尿肌)和躯体(随意)神经元 括约肌(EUS)。脊髓损伤后，这些肌肉之间的协调性丧失，它们自发收缩。 虽然关于脊髓损伤如何改变馈入脊髓的神经元通路的兴奋性的一些事情是已知的 脊髓(传入)和脊髓损伤如何改变这些肌肉的兴奋性，相对较少知道如何兴奋性 包含在称为大神经的神经元集合中的神经元(自主神经膀胱神经 骨盆神经节(MPG)改变。这项提议的主要目的是描述人的兴奋性是如何 这些神经元在急性(伤后3天)和慢性(伤后28天)脊髓损伤后发生变化。的小鼠模型 SCI将被用来确定损伤如何改变神经元基于其固有属性的放电能力 (相对于它们来自其他神经元的输入)。将调查导致产量改变的潜在机制 使用电压钳和离子电流的药物解剖来测量潜在的变化 膜电导。以确定膜电导的潜在变化是否是 通道表达的改变，将使用单细胞定量RT-PCR(qRT-PCR)来检测 损伤和完整动物的MPG神经元转录本数量。拟议中的工作将大大改进 通过提供一个非常必要的扩展来了解膀胱反射回路 MPG神经元功能的生理特性和潜在离子机制的表征。在……里面 此外，这些研究是对脊髓损伤导致的MPG可塑性的最早分析之一， 神经原性膀胱功能障碍综合治疗成功的启示。

Abstract (UNCHANGED FROM ORIGINAL APPLICATION) The circuit that controls the micturition reflex is composed of autonomic neurons that control smooth bladder muscle (Detrusor) and somatic (voluntary) neurons that control the skeletal muscle of the external urethral sphincter (EUS). After SCI, the coordination between these muscles is lost and they contract spontaneously. While something is known about how SCI alters the excitability of neuronal pathways that feed into the spinal cord (afferents) and how SCI alters the excitability of these muscles, relatively little is known how excitability of the neurons (autonomic bladder-innervating neurons) contained in a collection of neurons called the major pelvic ganglia (MPG) is altered. The primary aim of this proposal is to characterize how the excitability of these neurons changes after acute (3 days post injury) and chronic (28 days post injury) SCI. Mouse models of SCI will be used to determine how injury alters the ability of neurons to fire based on their intrinsic properties (as opposed to their input from other neurons). Underlying mechanisms for altered output will be investigated using voltage clamp and pharmacological dissection of ionic currents to measure changes in underlying membrane conductance. To determine whether underlying changes in membrane conductance are the result of alterations in channel expression, single-cell quantitative RT-PCR (qRT-PCR) will be used to measure transcript numbers from MPG neurons in injured and intact animals. The proposed work will greatly improve the basic understanding of bladder reflex circuitry by providing a much needed extension of the characterization of the physiological properties and underlying ionic mechanisms of MPG neuron function. In addition, these studies represent one of the first analyses of plasticity at the MPG as a result of SCI, with implications for the successful comprehensive treatment of neurogenic bladder dysfunction.