Contribution of Sigma Receptor Activation to Neuropathic Pain

Sigma 受体激活对神经病理性疼痛的影响

• 批准号: 8099763
• 负责人: HSIANG-EN WU
• 金额: $ 14.28万
• 依托单位: MEDICAL COLLEGE OF WISCONSIN
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8099763
• 关键词: Absence of pain sensation; Afferent Neurons; Attenuated; Behavior; Behavioral; Binding; Biological; Calcium; Calcium Signaling; Cell Death; Cells; Control Animal; Cytophotometry; Dedications; Depressed mood; Electrophysiology (science); Endoplasmic Reticulum; Environment; Esthesia; Evaluation; Familiarity; Formalin; Foundations; Freund' s Adjuvant; Functional disorder; Funding; Future; Gene Expression; Generations; Goals; Health; Hyperalgesia; In Vitro; Inflammation; Inflammatory; Infusion procedures; Injection of therapeutic agent; Injury; Investigation; Knowledge; Life; Ligands; Ligation; Measures; Mentors; Methods; Mitochondria; Modeling; Molecular; Molecular Biology; Morphine; Nerve; Neuroglia; Neurons; Neuropharmacology; Nociception; Opioid; Pain; Pain Research; Pathway interactions; Pattern; Peptides; Peripheral nerve injury; Process; Productivity; Rattus; Receptor Activation; Regulation; Research; Research Personnel; Research Training; Resistance; Reverse Transcriptase Polymerase Chain Reaction; Role; Scientist; Shapes; Signal Transduction; Spinal Ganglia; Spinal nerve structure; Subgroup; Testing; Training Programs; Transcript; Trauma; Western Blotting; Wisconsin; addiction; cell type; cellular imaging; clinically relevant; in vivo; inflammatory neuropathic pain; inflammatory pain; medical schools; nerve injury; neuronal cell body; neuronal excitability; neurotransmitter release; novel therapeutics; pain behavior; pain inhibition; painful neuropathy; patch clamp; programs; protein expression; radioligand; receptor; research study; selective expression; sigma receptors; skills; voltage

DESCRIPTION (provided by applicant): This application proposes a program of training and research to expand the candidate's future prospects in achieving independence in pain research. The candidate has demonstrated his dedication to research and his initiative and high productivity in prior investigations, but he requires familiarity with a broader range of experimental approaches to fully explore pain pathophysiology and to be competitive in independent funding. The mentor. Dr. Hogan is a well-established clinician/scientist, and the dynamic research surrounding at Medical College of Wisconsin provides an ideal environment for the candidate to become a highly productive independent researcher. The program will help the candidate to accomplish the following goals: 1) establish modern scientific knowledge, acquire the newest research skills, and refine critical analytical abilities; 2) provide coursework and interactive settings that will expand independence as a scientist; 3) apply this new knowledge to examine the role of sigma receptors (aR) in traumatic painful neuropathy and inflammatory pain. Sensory neurons, including their somata in the dorsal root ganglion (DRG), develop abnormal function following nerve trauma and inflammation that contributes to pain. Although numerous triggers have been proposed for initiating these debilitating conditions, none has been established as a clinically relevant pathway. The proposed studies will examine the central hypothesis that activation of alR receptors in nociceptive sensory neurons contributes to neuropathic and inflammatory pain through inhibition of calcium signaling. Specific Aim 1 will determine the effects of olR ligands on behavioral hyperalgesia after nerve injury and injection of complete Freund's adjuvant. Specific Aim 2 will define the expression of olR in primary sensory neurons under baseline conditions. Specific Aim 3 will examine functional consequences of olR activation in vitro, including effects on inward Ca2+ currents, neuronal excitability, and intracellular Ca2+ signaling. Specific Aim 4 will identify expression and functional contributions of alR activity to changes after nerve injury and inflammation. These proposed experiments will employ convergent approaches including molecular and cell biological methods, immunohistochemical and live cell imaging, electrophysiological recording, and behavioral evaluation. The program will establish the candidate's new expertise in electrophysiology, molecular biology, and neuropharmacology and provide the foundation for establishing an independent research program considering olR in pain, opioid tolerance, and addiction. PUBLIC HEALTH RELEVANCE: Exploration of the contributions of alR in primary sensory neurons to pain sensation may provide a new therapeutic pathway for pain conditions that are resistant to currently available treatments.

描述（由申请人提供）：本申请提出了一个培训和研究计划，以扩大候选人在疼痛研究中实现独立的未来前景。候选人已经证明了他对研究的奉献精神，他的主动性和高生产力在以前的调查，但他需要熟悉更广泛的实验方法，以充分探索疼痛病理生理学，并在独立的资金竞争力。导师霍根博士是一位成熟的临床医生/科学家，威斯康星州医学院的动态研究为候选人成为一名高效的独立研究人员提供了理想的环境。该计划将帮助候选人实现以下目标：1）建立现代科学知识，获得最新的研究技能，并完善批判性分析能力; 2）提供课程和互动设置，将扩大作为科学家的独立性; 3）应用这些新知识来检查sigma受体（aR）在创伤性疼痛神经病变和炎症性疼痛中的作用。感觉神经元，包括它们在背根神经节（DRG）中的胞体，在神经创伤和炎症后发展异常功能，从而导致疼痛。虽然已经提出了许多触发这些衰弱的条件，没有一个已经建立了临床相关的途径。拟议的研究将检验中心假设，即伤害性感觉神经元中alR受体的激活通过抑制钙信号传导而导致神经性和炎症性疼痛。具体目标1将确定神经损伤和注射完全弗氏佐剂后olR配体对行为痛觉过敏的影响。具体目标2将定义在基线条件下初级感觉神经元中olR的表达。具体目标3将检查体外olR激活的功能后果，包括对内向Ca 2+电流、神经元兴奋性和细胞内Ca 2+信号传导的影响。具体目标4将确定alR活性对神经损伤和炎症后变化的表达和功能贡献。这些拟议的实验将采用会聚的方法，包括分子和细胞生物学方法，免疫组织化学和活细胞成像，电生理记录和行为评价。该计划将建立候选人在电生理学，分子生物学和神经药理学方面的新专业知识，并为建立一个考虑疼痛，阿片类药物耐受性和成瘾的独立研究计划提供基础。 公共卫生相关性：探索初级感觉神经元中alR对疼痛感觉的贡献可能为对目前可用的治疗有抗性的疼痛状况提供新的治疗途径。