A computer model of dorsal cochlear nucleus pyramidal cells: Intrinsic membrane properties

1995 ◽  
Vol 97 (4) ◽  
pp. 2405-2413 ◽  
Author(s):  
Michael J. Hewitt ◽  
Ray Meddis
Keyword(s):  
Computer Model ◽  
Cochlear Nucleus ◽  
Pyramidal Cells ◽  
Dorsal Cochlear Nucleus ◽  
Membrane Properties ◽  
Intrinsic Membrane Properties

scholarly journals Two Populations of Layer V Pyramidal Cells of the Mouse Neocortex: Development and Sensitivity to Anesthetics

2005 ◽  
Vol 94 (5) ◽  
pp. 3357-3367 ◽  
Author(s):  
Elodie Christophe ◽  
Nathalie Doerflinger ◽  
Daniel J. Lavery ◽  
Zoltán Molnár ◽  
Serge Charpak ◽  
...  
Keyword(s):  
Action Potential ◽  
Calcium Binding ◽  
Pyramidal Neurons ◽  
Pyramidal Cells ◽  
Membrane Properties ◽  
Subcortical Structures ◽  
Contralateral Cortex ◽  
Layer V ◽  
Intrinsic Membrane Properties ◽  
Two Populations

Previous studies have shown that layer V pyramidal neurons projecting either to subcortical structures or the contralateral cortex undergo different morphological and electrophysiological patterns of development during the first three postnatal weeks. To isolate the determinants of this differential maturation, we analyzed the gene expression and intrinsic membrane properties of layer V pyramidal neurons projecting either to the superior colliculus (SC cells) or the contralateral cortex (CC cells) by combining whole cell recordings and single-cell RT-PCR in acute slices prepared from postnatal day (P) 5–7 or P21–30 old mice. Among the 24 genes tested, the calcium channel subunits α1B and α1C, the protease Nexin 1, and the calcium-binding protein calbindin were differentially expressed in adult SC and CC cells and the potassium channel subunit Kv4.3 was expressed preferentially in CC cells at both stages of development. Intrinsic membrane properties, including input resistance, amplitude of the hyperpolarization-activated current, and action potential threshold, differed quantitatively between the two populations as early as from the first postnatal week and persisted throughout adulthood. However, the two cell types had similar regular action potential firing behaviors at all developmental stages. Surprisingly, when we increased the duration of anesthesia with ketamine–xylazine or pentobarbital before decapitation, a proportion of mature SC cells, but not CC cells, fired bursts of action potentials. Together these results indicate that the two populations of layer V pyramidal neurons already start to differ during the first postnatal week and exhibit different firing capabilities after anesthesia.

scholarly journals Electrophysiological classes of layer 2/3 pyramidal cells in monkey prefrontal cortex

2012 ◽  
Vol 108 (2) ◽  
pp. 595-609 ◽  
Author(s):  
A. V. Zaitsev ◽  
N. V. Povysheva ◽  
G. Gonzalez-Burgos ◽  
D. A. Lewis
Keyword(s):  
Working Memory ◽  
Prefrontal Cortex ◽  
Functional Properties ◽  
Pyramidal Neurons ◽  
Pyramidal Cells ◽  
Spiking Neurons ◽  
Membrane Properties ◽  
Layer 2 ◽  
Monkey Prefrontal Cortex ◽  
Intrinsic Membrane Properties

The activity of supragranular pyramidal neurons in the dorsolateral prefrontal cortex (DLPFC) neurons is hypothesized to be a key contributor to the cellular basis of working memory in primates. Therefore, the intrinsic membrane properties, a crucial determinant of a neuron's functional properties, are important for the role of DLPFC pyramidal neurons in working memory. The present study aimed to investigate the biophysical properties of pyramidal cells in layer 2/3 of monkey DLPFC to create an unbiased electrophysiological classification of these cells. Whole cell voltage recordings in the slice preparation were performed in 77 pyramidal cells, and 24 electrophysiological measures of their passive and active intrinsic membrane properties were analyzed. Based on the results of cluster analysis of 16 independent electrophysiological variables, 4 distinct electrophysiological classes of monkey pyramidal cells were determined. Two classes contain regular-spiking neurons with low and high excitability and constitute 52% of the pyramidal cells sampled. These subclasses of regular-spiking neurons mostly differ in their input resistance, minimum current that evoked firing, and current-to-frequency transduction properties. A third class of pyramidal cells includes low-threshold spiking cells (17%), which fire a burst of three-five spikes followed by regular firing at all suprathreshold current intensities. The last class consists of cells with an intermediate firing pattern (31%). These cells have two modes of firing response, regular spiking and bursting discharge, depending on the strength of stimulation and resting membrane potential. Our results show that diversity in the functional properties of DLPFC pyramidal cells may contribute to heterogeneous modes of information processing during working memory and other cognitive operations that engage the activity of cortical circuits in the superficial layers of the DLPFC.

scholarly journals Development of spontaneous firing of fusiform neurons from the dorsal cochlear nucleus of mice occurs after hearing onset

2021 ◽  
Author(s):  
Nikollas M. Benites ◽  
Beatriz Rodrigues ◽  
Carlos H. Silveira ◽  
Ricardo M. Leão
Keyword(s):  
Action Potential ◽  
Cochlear Nucleus ◽  
Sodium Current ◽  
Dorsal Cochlear Nucleus ◽  
Active State ◽  
Membrane Properties ◽  
Action Potential Firing ◽  
Electrophysiological Properties ◽  
Somatosensory Information ◽  
Potential Firing

AbstractThe dorsal cochlear nucleus (DCN) in the auditory brainstem integrates auditory and somatosensory information. Mature fusiform neurons express two qualitative intrinsic states in equal proportions: quiet, with no spontaneous regular action potential firing, or active, with regular spontaneous action potential firing. However, how these firing states and other electrophysiological properties of fusiform neurons develop during early postnatal days to adulthood is not known. Thus, we recorded fusiform neurons from mice from P4 to P21 and analyzed their electrophysiological properties. In the pre-hearing phase (P4-P13), we found that fusiform neurons are mostly quiet, with the active state emerging after hearing onset at P14. Subthreshold properties present more variations before hearing onset, while action potential properties vary more after P14, developing bigger, shorter, and faster action potentials. Interestingly, the activity threshold is more depolarized in pre-hearing cells suggesting that persistent sodium current (INaP) increases its expression after hearing. In fact, INaP increases its expression after hearing, accordingly with the development of active neurons. Thus, we suggest that the post-hearing expression of INaP creates the active state of the fusiform neuron. At the same time, other changes refine the passive membrane properties and increase the speed of action potential firing of fusiform neurons.

Membrane properties and synaptic currents evoked in CA1 interneuron subtypes in rat hippocampal slices

1996 ◽  
Vol 76 (1) ◽  
pp. 1-16 ◽  
Author(s):  
F. Morin ◽  
C. Beaulieu ◽  
J. C. Lacaille
Keyword(s):  
Voltage Clamp ◽  
Hippocampal Slices ◽  
Pyramidal Cells ◽  
Cell Types ◽  
Membrane Properties ◽  
Postsynaptic Potentials ◽  
Postsynaptic Currents ◽  
Current Pulses ◽  
Intrinsic Membrane Properties ◽  
Reversal Potentials

1. Intrinsic membrane properties and pharmacologically isolated excitatory and inhibitory postsynaptic currents (EPSCs and IPSCs, respectively) were characterized with the use of whole cell current- and voltage-clamp recordings, in combination with biocytin labeling, in different subtypes of CA1 interneurons and pyramidal cells in rat hippocampal slices. 2. Three classes of interneurons were selected on the basis of their soma location in the CA1 region: 1) in stratum (str.) oriens near the alveus (O/A), 2) near str. pyramidale, and 3) near the border of str. radiatum and lacunosum-moleculare. Each class of biocytin-labeled cells demonstrated specific cellular morphology. The somata of all interneurons were nonpyramidal in shape and usually multipolar. However, the pattern of dendritic and axonal arborizations of labeled interneurons differed in each class. 3. In current-clamp recordings, all interneuron subtypes had shorter-duration and smaller-amplitude action potentials than pyramidal cells. Fast- and medium-duration afterhyperpolarizations were larger in amplitude in interneurons. Cell input resistance was greater and membrane time constant was faster in all interneuron subtypes than in pyramidal cells. 4. Depolarizing current pulses evoked regular firing in all classes of interneurons, whereas burst firing was observed in 50% of pyramidal cells. With hyperpolarizing current pulses, all nonpyramidal and pyramidal cell types displayed inward rectification followed by anodal break excitation. 5. Electrical stimulation of nearby afferents evoked excitatory postsynaptic potentials (EPSPs) in all cells. EPSPs were of short duration and usually followed by inhibitory postsynaptic potentials (IPSPs). EPSPs were mediated by glutamate, because they were blocked by non-N-methyl-D-aspartate (non-NMDA) and NMDA antagonists [6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) and (+/-)-2-amino-5-phosphonopentanoic acid (AP5), respectively]. In the presence of these antagonists, IPSPs were evoked in isolation and reversed near -72 mV. 6. In voltage-clamp recordings, non-NMDA EPSCs were isolated pharmacologically in the presence of AP5 and the gamma-aminobutyric acid-A (GABAA) antagonist bicuculline (BIC). Their properties were similar in all interneuron subtypes and pyramidal cells. Current-voltage (I-V) relations were linear, and mean reversal potentials were near 5 mV. Non-NMDA EPSCs were reversibly antagonized by CNQX. 7. NMDA EPSCs were pharmacologically isolated during CNQX and BIC application and were observed in all cell types. I-V relations of NMDA EPSCs demonstrated a region of negative slope at membrane potentials between -80 and -20 mV and their reversal potential was near 7 mV. The rise time of NMDA EPSCs was significantly slower in O/A interneurons than in other cell types. NMDA EPSCs were reversibly antagonized by AP5. 8. GABAA IPSCs were pharmacologically isolated in AP5 and CNQX and their properties were similar in all cell types. I-V relations of GABAA IPSCs were linear with mean reversal potentials near -32 mV. GABAA IPSCs were reversibly blocked by BIC. 9. In conclusion, morphologically different subtypes of interneurons located in O/A, near str. pyramidale, and near the str. radiatum/lacunosum-moleculare border displayed intrinsic membrane properties that were distinct from pyramidal cells, but were similar among them. In contrast, the properties of non-NMDA, NMDA, and GABAA postsynaptic currents were similar between interneurons and pyramidal cells, except for NMDA EPSCs, which had slower rise times in O/A interneurons.

Possible modulatory role of voltage-activated Ca2+ currents determining the membrane properties of isolated pyramidal neurones of the rat dorsal cochlear nucleus

1999 ◽  
Vol 839 (1) ◽  
pp. 109-119 ◽  
Author(s):  
Csaba Harasztosi ◽  
Ian D Forsythe ◽  
Géza Szûcs ◽  
Peter R Stanfield ◽  
Zoltán Rusznák
Keyword(s):  
Cochlear Nucleus ◽  
Dorsal Cochlear Nucleus ◽  
Membrane Properties

scholarly journals D-Stellate Neurons of the Ventral Cochlear Nucleus Decrease in Auditory Nerve-Evoked Activity during Age-Related Hearing Loss

2019 ◽  
Vol 9 (11) ◽  
pp. 302
Author(s):  
Yong Wang ◽  
Meijian Wang ◽  
Ruili Xie
Keyword(s):  
Hearing Loss ◽  
Cochlear Nucleus ◽  
Auditory Nerve ◽  
Inhibitory Neurons ◽  
Membrane Properties ◽  
Patch Clamp Technique ◽  
Age Related ◽  
Underlying Mechanisms ◽  
Age Related Hearing Loss ◽  
Intrinsic Membrane Properties

Age-related hearing loss (ARHL) is associated with weakened inhibition in the central auditory nervous system including the cochlear nucleus. One of the main inhibitory neurons of the cochlear nucleus is the D-stellate neuron, which provides extensive glycinergic inhibition within the local neural network. It remains unclear how physiological activities of D-stellate neurons change during ARHL and what are the underlying mechanisms. Using in vitro whole-cell patch clamp technique, we studied the intrinsic membrane properties of D-stellate neurons, the changes of their firing properties, and the underlying mechanisms in CBA/CaJ mice at the ages of 3–4 months (young), 17–19 months (middle age), and 27–33 months (aged). We found that the intrinsic membrane properties of D-stellate neurons were unchanged among these three age groups. However, these neurons showed decreased firing rate with age in response to sustained auditory nerve stimulation. Further investigation showed that auditory nerve-evoked excitatory postsynaptic currents (EPSCs) were significantly reduced in strength with age. These findings suggest that D-stellate neurons receive weakened synaptic inputs from the auditory nerve and decreased sound driven activity with age, which are expected to reduce the overall inhibition and enhance the central gain in the cochlear nucleus during ARHL.

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