The Role of the Neuronal Membrane Proteasome in the Peripheral Nervous System and Pain Sensation

神经膜蛋白酶体在周围神经系统和痛觉中的作用

• 批准号: 10751515
• 负责人: Taylor Renne Church
• 金额: $ 4.77万
• 依托单位: JOHNS HOPKINS UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2027-09-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10751515
• 关键词: Acute; Address; Affect; Afferent Neurons; Attenuated; Axon; Axonal Transport; Behavioral Assay; Binding; Biochemical; Biological Assay; Bortezomib; Calcium Signaling; Cell Cycle Arrest; Cell membrane; Cells; Central Nervous System; Characteristics; Collaborations; Communication; Complex; Confocal Microscopy; Cryoelectron Microscopy; Data; Defect; Dendrites; Detection; Development; Disease; Dose; Electron Microscopy; Electrophysiology (science); Extracellular Space; Fiber; Foundations; Freezing; Future; Glycoproteins; Goals; Grant; Health; Image; Immunofluorescence Immunologic; Individual; Investigation; Knock-out; Label; Laboratories; Length; Limb structure; Long-Term Potentiation; MG132; Macromolecular Complexes; Mechanics; Membrane; Modality; Modeling; Molecular; Molecular Structure; Multiple Myeloma; Mus; Nervous System; Neurons; Neuropathy; Nociception; Nociceptors; Numbness; Outcome; Pain; Paracrine Communication; Pathway interactions; Patients; Pattern; Peptide Signal Sequences; Peptides; Peripheral Nervous System; Peripheral Nervous System Diseases; Pharmaceutical Preparations; Physiological; Play; Prevention; Production; Property; Proprioception; Proteasome Binding; Proteasome Inhibition; Proteasome Inhibitor; Proteins; Regulation; Reporter; Research; Role; Sensory; Series; Signal Transduction; Skin Tissue; Spinal Ganglia; Structure; Synapses; Techniques; Testing; Therapeutic; Thinness; Work; chemotherapy; experimental study; extracellular; in vivo calcium imaging; inflammatory pain; inhibitor; insight; light microscopy; mechanical allodynia; multicatalytic endopeptidase complex; myelination; neuronal cell body; neuronal patterning; neurotoxicity; novel; pain reduction; pain sensation; pain sensitivity; pain signal; painful neuropathy; protein complex; protein degradation; side effect; somatosensory; therapeutic target; ultra high resolution

PROJECT SUMMARY While the proteasome is typically known as protein degradation machinery, it is now recognized to have additional signaling functions in the nervous system. One poorly understood but therapeutically important role for the proteasome is in pain regulation in the peripheral nervous system (PNS). However, the relationship of proteasome activity to pain sensation is complex and somewhat paradoxical: proteasome inhibition has been found to either reduce pain or to cause pain sensitization and peripheral neuropathies depending on length of inhibition, type of inhibitor, and inhibitor dose. A recent discovery that may grant insight into this regulatory mechanism is our laboratory’s detection of a specialized, neuron-specific proteasome bound to the plasma membrane (NMP: neuronal membrane proteasome) that rapidly modulates activity-dependent neuronal calcium signaling through the release of extracellular signaling peptides. Preliminary data from our laboratory has demonstrated that NMP inhibition reduces dorsal root ganglion nociceptor activity and mechanical pain sensitivity, indicating that this novel neuronal communication pathway may be critical in proteasome/pain signaling. However, many fundamental questions about the NMP remain, including how it differs from cytosolic proteasomes and how variable NMP expression across neuronal sub-populations affects pain sensation. The central hypothesis of this proposal is that the PNS NMP plays an important role in pain signaling and that characteristics of NMP expression in PNS sensory neurons, including subtype-specific activity patterns and membrane localization patterns, directly affect its modulation of pain sensitization via differences in paracrine signaling. To address this hypothesis, we propose a series of biochemical, molecular, physiological, and behavioral assays addressing two specific aims: Aim 1. To determine the distribution and structure of the NMP in PNS neuronal membranes; and Aim 2. To investigate the role of the PNS NMP in diverse neuronal subtypes relevant to pain sensation. The completion of these aims will elucidate fundamental properties about the PNS NMP and provide insight into its regulatory role in pain sensation, identifying possible therapeutic avenues for pain modulation and laying the foundation for future investigations examining the role of the PNS NMP in health and disease.

项目摘要 虽然蛋白酶体通常称为蛋白质降解机械，但现在被认为具有 神经系统中的其他信号传导功能。一个人不了解但在治疗上重要的角色 因为蛋白酶体正在调节周围神经系统（PNS）中。但是，关系的关系 蛋白酶体对疼痛感觉是复杂的，有些自相矛盾：蛋白酶体抑制已是 发现可以减轻疼痛或引起疼痛敏感性和周围神经病 抑制作用，抑制剂类型和抑制剂剂量。最近的发现，可以洞悉此监管 机制是我们实验室发现与等离子体结合的专业的，神经特异性的蛋白酶体 膜（NMP：神经元膜蛋白酶体）快速调节活性依赖性神经元钙 通过释放细胞外信号传导肽的信号传导。我们实验室的初步数据 证明NMP抑制减少了背根神经节伤害感受器的活性和机械疼痛 敏感性，表明这种新型的神经元通信途径在蛋白酶体/疼痛中可能至关重要 信号。但是，关于NMP的许多基本问题仍然存在，包括它与胞质的不同 蛋白酶体以及神经元亚群中的NMP的可变表达如何影响疼痛感觉。这 该提案的中心假设是PNS NMP在疼痛信号中起重要作用，并且 NMP表达在PNS感觉神经元中的特征，包括亚型特异性活性模式和 膜定位模式，直接影响其通过旁分泌差异的疼痛敏感性调节 信号。为了解决这一假设，我们提出了一系列生化，分子，生理和 行为分析针对两个具体目标：目标1。确定NMP的分布和结构 在PNS神经元膜中；和目标2。研究PNS NMP在潜水神经元亚型中的作用 与疼痛感有关。这些目标的完成将阐明有关PNS的基本属性 NMP并洞悉其在疼痛感觉中的调节作用，确定可能的治疗途径 疼痛调节并为未来的投资奠定基础，以研究PNS NMP在健康中的作用 和疾病。