Investigating the Response of CNS Neurons to Electric and Magnetic Stimulation

研究中枢神经系统神经元对电和磁刺激的反应

基本信息

批准号：
10673590
负责人：
Shelley Fried
金额：
$ 59.83万
依托单位：
MASSACHUSETTS GENERAL HOSPITAL
依托单位国家：
美国
项目类别：
财政年份：
2019
资助国家：
美国
起止时间：
2019-06-15 至 2024-05-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10673590
关键词：
Action Potentials Anatomy Axon Biophysics Blinded Calibration Cell membrane Cell model Cell physiology Cells Cellular Morphology Communities Complex Computer Models Dendrites Development Devices Distal Effectiveness Electric Stimulation Fire - disasters Germ Cells Goals Implant Individual Ion Channel Ion Channel Gating Knowledge Location Macular degeneration Magnetism Maps Measurement Measures Microelectrodes Modeling Morphology Motor Cortex Mus Neocortex Neurons Oryctolagus cuniculus Performance Physiological Physiology Population Prefrontal Cortex Process Property Prosthesis Recommendation Research Retina Retinal Degeneration Retinal Ganglion Cells Retinitis Pigmentosa Series Shapes Signal Transduction Sodium Channel Stimulus Testing Tissues Training Translations Vision Work area striata cell type density effectiveness evaluation electric field experimental study hippocampal pyramidal neuron implantable device improved luminance neocortical nervous system disorder neural neural patterning neural prosthesis neuronal cell body neurotransmission next generation nonhuman primate novel predicting response predictive modeling response retinal neuron retinal prosthesis voltage

项目摘要

Our long-term goals are to better understand the response of neurons to artificial stimulation, and, to use this knowledge to develop new and more effective strategies for stimulating non- or improperly-functioning neurons of the CNS. The development of models that comprehensively and accurately predict the response of neural populations to electric stimulation has proven challenging, in part because of the significant morphological differences that can exist even between nearby cells, and, a lack of understanding as to how such differences shape each cell’s response to stimulation. A comprehensive understanding of the activation process would not only allow the development of models that would more accurately predict population responses but would also support the development of more effective stimulation strategies. In the retina for example, cells that respond to increases in luminance (ON cells) typically lie adjacent to cells that respond to luminance decreases (OFF cells); the two do not typically fire action potentials in response to the same stimulus and therefore, a prosthesis that activates both simultaneously creates a pattern of neural activity that is non-physiological. Mis- match between natural and artificial signals limits the quality of vision that can be obtained by a retinal prosthesis and similarly limits the effectiveness of other CNS-based prostheses as well. Here, we propose to comprehensively study how individual cellular properties each influence the response to artificial stimulation. Our approach will be to map sensitivity across a cell, and then compare physiological maps to cellular morphology, including the expression of voltage-gated ion channels; this will allow us to identify the specific cellular regions that have the strongest influence on responsivity. Computational models based on our precise anatomical measurements can be calibrated from the physiological maps to optimize the accuracy of the models; they will also help to unequivocally identify the relative sensitivity of individual features. Comparison of multiple cells within the same cell type will help to further identify the features that have the strongest influence on threshold and repeating the process across multiple cell types, different CNS regions and multiple species will lead to a comprehensive understanding of the activation process, along with the concurrent development of models that accurately predict the response of large populations of neurons to many different forms of stimulation. The inclusion of non-human primate tissue in the study will enhance the translation value of our findings. Validated models will be used to study responses to more advanced stimulating strategies, e.g. the high-rate stimulus trains that produce selective activation in ON vs. OFF cell types of the retina, and, the use of magnetic stimulation from implantable micro-coils to selectively target pyramidal neurons in the cortex while avoiding nearby passing axons from distal neurons. Models will be further enhanced from each new set of experiments and the comprehensive set (of models) will be made widely available to the research community.

我们的长期目标是更好地了解神经元对人工刺激的反应，并利用这一点开发新的、更有效的策略来刺激非功能或功能异常的神经元的知识全面、准确地预测神经反应的模型的发展。事实证明，对人群进行电刺激具有挑战性，部分原因是显着的形态学即使在附近的细胞之间也可能存在差异，并且缺乏对这些差异如何产生的理解塑造每个细胞对刺激的反应不会对激活过程有全面的了解。只允许开发能够更准确地预测人口反应的模型，但也会支持开发更有效的刺激策略，例如在视网膜中，反应细胞。响应亮度增加（ON 单元）的单元通常与响应亮度降低（OFF 单元）的单元相邻细胞）；两者通常不会响应相同的刺激而激发动作电位，因此，同时激活两者的假体会产生一种非生理性的神经活动模式。自然信号和人工信号之间的匹配限制了视网膜可以获得的视觉质量假肢，同样也限制了其他基于中枢神经系统的假肢的有效性。全面研究个体细胞特性如何影响对人工刺激的反应。我们的方法是绘制整个细胞的敏感性图，然后将生理图与细胞图进行比较形态学，包括电压门控离子通道的表达；这将使我们能够识别特定的基于我们精确的计算模型的细胞区域。可以根据生理图校准解剖测量，以优化测量的准确性模型；它们还将有助于明确识别各个特征的相对敏感性。同一细胞类型中的多个细胞将有助于进一步识别影响最强的特征在阈值上并在多种细胞类型、不同中枢神经系统区域和多种物种中重复该过程将导致对激活过程的全面了解，以及并行开发准确预测大量神经元对多种不同形式的反应的模型研究中纳入非人类灵长类组织将提高我们的翻译价值。验证的模型将用于研究对更先进的刺激策略的反应，例如高速刺激序列可选择性激活视网膜的 ON 细胞类型和 OFF 细胞类型，以及使用植入式微线圈的磁刺激选择性地针对皮层中的锥体神经元，同时每一组新的模型都将进一步增强避免来自远端神经元的附近传递轴突。实验和综合的（模型）集将广泛提供给研究界。