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Yao C, He Z, Nakano T, Shuai J. Spiking patterns of a neuron model to stimulus: Rich dynamics and oxygen's role. CHAOS (WOODBURY, N.Y.) 2018; 28:083112. [PMID: 30180647 DOI: 10.1063/1.5018707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 07/23/2018] [Indexed: 06/08/2023]
Abstract
Neuronal spiking patterns, which are of fundamental importance for the understanding of information processing in neural systems, can be generated in response to different stimuli. We here investigate in detail the stimulus-induced spiking patterns in a biologically plausible neuron model in which the oxygen concentration and the dynamical concentrations of potassium, sodium, and chloride are considered. Various types of spiking patterns can be induced by the different external potassium accumulations in response to the stimulus, including two different types of epileptic seizure (SZ) and spreading depression (SD) states, two different mixed states of SD and SZ, SZ state with multi-burst, and tonic firing behaviors. Interestingly, we show that these rich spiking patterns can also be induced by the current stimulus with a low oxygen concentration. Furthermore, we reveal that the stimulus can induce two different phase transitions from the SD state to the SZ state according to the phase transition theory, which results in the different electrical activities. All these findings may provide insight into information processing in neural systems.
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Affiliation(s)
- Chenggui Yao
- Department of Mathematics, Shaoxing University, Shaoxing 312000, China
| | - Zhiwei He
- Department of Mathematics, Shaoxing University, Shaoxing 312000, China
| | - Tadashi Nakano
- Graduate School of Frontier Biosciences, Osaka University, 1-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Jianwei Shuai
- Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China
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Hamani C, Florence G, Heinsen H, Plantinga BR, Temel Y, Uludag K, Alho E, Teixeira MJ, Amaro E, Fonoff ET. Subthalamic Nucleus Deep Brain Stimulation: Basic Concepts and Novel Perspectives. eNeuro 2017; 4:ENEURO.0140-17.2017. [PMID: 28966978 PMCID: PMC5617209 DOI: 10.1523/eneuro.0140-17.2017] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 07/07/2017] [Accepted: 08/06/2017] [Indexed: 12/21/2022] Open
Abstract
Over the last decades, extensive basic and clinical knowledge has been acquired on the use of subthalamic nucleus (STN) deep brain stimulation (DBS) for Parkinson's disease (PD). It is now clear that mechanisms involved in the effects of this therapy are far more complex than previously anticipated. At frequencies commonly used in clinical practice, neural elements may be excited or inhibited and novel dynamic states of equilibrium are reached. Electrode contacts used for chronic DBS in PD are placed near the dorsal border of the nucleus, a highly cellular region. DBS may thus exert its effects by modulating these cells, hyperdirect projections from motor cortical areas, afferent and efferent fibers to the motor STN. Advancements in neuroimaging techniques may allow us to identify these structures optimizing surgical targeting. In this review, we provide an update on mechanisms and the neural elements modulated by STN DBS.
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Affiliation(s)
- Clement Hamani
- Division of Neurosurgery Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
- Division of Neuroimaging, Centre for Addiction and Mental Health, Toronto, Ontario, Canada
- Division of Neurosurgery, Department of Neurology, University of São Paulo Medical School, São Paulo, Brazil
| | - Gerson Florence
- Division of Neurosurgery, Department of Neurology, University of São Paulo Medical School, São Paulo, Brazil
| | - Helmut Heinsen
- Department of Radiology, University of São Paulo Medical School, São Paulo, Brazil
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Clinic of Würzburg, Würzburg, Germany
| | - Birgit R. Plantinga
- Department of Biomedical Image Analysis, Eindhoven University of Technology, Eindhoven, The Netherlands
- Department of Neurosurgery, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Yasin Temel
- Department of Neurosurgery, Maastricht University Medical Center, Maastricht, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Kamil Uludag
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, The Netherlands
| | - Eduardo Alho
- Division of Neurosurgery, Department of Neurology, University of São Paulo Medical School, São Paulo, Brazil
| | - Manoel J. Teixeira
- Division of Neurosurgery, Department of Neurology, University of São Paulo Medical School, São Paulo, Brazil
| | - Edson Amaro
- Department of Radiology, University of São Paulo Medical School, São Paulo, Brazil
| | - Erich T. Fonoff
- Division of Neurosurgery, Department of Neurology, University of São Paulo Medical School, São Paulo, Brazil
- Instituto de Ensino e Pesquisa Hospital Sírio-Libanês, São Paulo, Brazil
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Abstract
High-frequency deep brain stimulation (DBS) is an effective treatment for some movement disorders. Though mechanisms underlying DBS are still unclear, commonly accepted theories include a “functional inhibition” of neuronal cell bodies and the excitation of axonal projections near the electrodes. It is becoming clear, however, that the paradoxical dissociation “local inhibition” and “distant excitation” is far more complex than initially thought. Despite an initial increase in neuronal activity following stimulation, cells are often unable to maintain normal ionic concentrations, particularly those of sodium and potassium. Based on currently available evidence, we proposed an alternative hypothesis. Increased extracellular concentrations of potassium during DBS may change the dynamics of both cells and axons, contributing not only to the intermittent excitation and inhibition of these elements but also to interrupt abnormal pathological activity. In this article, we review mechanisms through which high extracellular potassium may mediate some of the effects of DBS.
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Affiliation(s)
- Gerson Florence
- Division of Functional Neurosurgery, Department of Neurology, Hospital das Clínicas, School of Medicine of the University of São Paulo, São Paulo, SP, Brazil
- Department of Radiology and Oncology, School of Medicine of the University of São Paulo, São Paulo, SP, Brazil
| | - Koichi Sameshima
- Department of Radiology and Oncology, School of Medicine of the University of São Paulo, São Paulo, SP, Brazil
| | - Erich T. Fonoff
- Division of Functional Neurosurgery, Department of Neurology, Hospital das Clínicas, School of Medicine of the University of São Paulo, São Paulo, SP, Brazil
| | - Clement Hamani
- Division of Neurosurgery, Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada
- Behavioural Neurobiology Laboratory and the Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, Ontario, Canada
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Wu XX, Shuai J. Effects of extracellular potassium diffusion on electrically coupled neuron networks. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 91:022712. [PMID: 25768536 DOI: 10.1103/physreve.91.022712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Indexed: 06/04/2023]
Abstract
Potassium accumulation and diffusion during neuronal epileptiform activity have been observed experimentally, and potassium lateral diffusion has been suggested to play an important role in nonsynaptic neuron networks. We adopt a hippocampal CA1 pyramidal neuron network in a zero-calcium condition to better understand the influence of extracellular potassium dynamics on the stimulus-induced activity. The potassium concentration in the interstitial space for each neuron is regulated by potassium currents, Na(+)-K(+) pumps, glial buffering, and ion diffusion. In addition to potassium diffusion, nearby neurons are also coupled through gap junctions. Our results reveal that the latency of the first spike responding to stimulus monotonically decreases with increasing gap-junction conductance but is insensitive to potassium diffusive coupling. The duration of network oscillations shows a bell-like shape with increasing potassium diffusive coupling at weak gap-junction coupling. For modest electrical coupling, there is an optimal K(+) diffusion strength, at which the flow of potassium ions among the network neurons appropriately modulates interstitial potassium concentrations in a degree that provides the most favorable environment for the generation and continuance of the action potential waves in the network.
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Affiliation(s)
- Xing-Xing Wu
- Department of Physics, Xiamen University, Xiamen 361005, P. R. China
| | - Jianwei Shuai
- Department of Physics, State Key Lab of Cellular Stress Biology, Innovation Center for Cell Signaling Network, and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University; Xiamen 361005, P. R. China
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Enhanced multiple vibrational resonances by Na+ and K+ dynamics in a neuron model. Sci Rep 2015; 5:7684. [PMID: 25567752 PMCID: PMC4286765 DOI: 10.1038/srep07684] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 12/08/2014] [Indexed: 12/13/2022] Open
Abstract
Some neuronal receptors perceive external input in the form of hybrid periodic signals. The signal detection may be based on the mechanism of vibrational resonance, in which a system's response to the low frequency signal can become optimal by an appropriate choice of the vibration amplitude of HFS. The vibrational resonance effect is investigated in a neuron model in which the intra- and extra-cellular potassium and sodium concentrations are allowed to evolve temporally, depending on ion currents, Na+-K+ pumps, glial buffering, and ion diffusion. Our results reveal that, compared to the vibrational resonances in the model with constant ion concentrations, the significantly enhanced vibrational multi-resonances can be observed for the single neuron system where the potassium and sodium ion concentrations vary temporally. Thus, in contradiction to a popular view that ion concentrations dynamics play little role in signal detection, we indicate that the neuron's response to an external subthreshold signal can be largely improved by sodium and potassium dynamics.
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Izús GG, Sánchez AD. Synchronization of chemical noise-sustained structures in asymmetrically coupled differential-flow reactors. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:062909. [PMID: 24483533 DOI: 10.1103/physreve.88.062909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Revised: 09/13/2013] [Indexed: 06/03/2023]
Abstract
The differential-flow-induced chemical instability is investigated in the context of two coupled reactors with cubic autocatalytic kinetics (the Gray-Scott model). Previous results for master-slave arrangement [Izús, Deza, and Sánchez, J. Chem. Phys. 132, 234112 (2010)] are extended in this study to include bidirectional coupling between reactions. Numerical simulations in the convectively unstable regime show that synchronized noise-sustained structures are developed in both reactors due to the selective amplification of noise. A theoretical analysis shows that the nature of the synchronization and the stability of the synchronized manifold are related with the properties of the critical modes.
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Affiliation(s)
- Gonzalo G Izús
- IFIMAR (Universidad Nacional de Mar del Plata and CONICET), Deán Funes 3350, B7602AYL Mar del Plata, Argentina
| | - Alejandro D Sánchez
- IFIMAR (Universidad Nacional de Mar del Plata and CONICET), Deán Funes 3350, B7602AYL Mar del Plata, Argentina
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Bistability of silence and seizure-like bursting. J Neurosci Methods 2013; 220:179-89. [DOI: 10.1016/j.jneumeth.2013.08.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 08/19/2013] [Accepted: 08/22/2013] [Indexed: 11/17/2022]
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