Related Experiment Video
Updated: Jun 4, 2026
09:17
Subcellular Patch-clamp Recordings from the Somatodendritic Domain of Nigral Dopamine Neurons
Published on: November 2, 2016
Modulation of dendritic synaptic processing in the lateral superior olive by hyperpolarization-activated currents
Katarina E Leão1, Richardson N Leão, Bruce Walmsley
1The John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia. Katarina.Leao@neuro.uu.se
The European Journal of Neuroscience
|March 4, 2011
Summary
Dendritic hyperpolarization-activated current (I(h)) in lateral superior olive (LSO) neurons is crucial for integrating synaptic inputs. Blocking this current widens the temporal summation window, impacting auditory processing.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Computational Neuroscience
Background:
- Lateral superior olive (LSO) neurons in mice possess a significant hyperpolarization-activated current (I(h)).
- Hyperpolarization-activated cyclic-nucleotide-gated type 1 channels, responsible for I(h), are located in both the soma and dendrites of LSO neurons.
Purpose of the Study:
- To investigate the role of dendritic I(h) in modulating synaptic input integration in LSO neurons.
- To determine how I(h) affects the temporal summation and integration of excitatory and inhibitory postsynaptic potentials.
Main Methods:
- Evoked excitatory postsynaptic potentials (EPSPs) combined with depolarizing current pulses to assess synaptic integration.
- Pharmacological blockade of I(h) using ZD7288.
- Computer-simulated somatic I(h) using dynamic clamp.
- Compartmental modeling of LSO neurons.
Main Results:
- Blocking dendritic I(h) widened the temporal summation window for synaptic inputs.
- I(h) blockade increased EPSP summation and altered the integration of excitatory and inhibitory postsynaptic potentials.
- Simulated somatic I(h) could not fully rescue the effects of dendritic I(h) blockade.
Conclusions:
- Dendritic I(h) plays a critical role in regulating synaptic integration within LSO neurons.
- The activation and deactivation of dendritic I(h) dynamically influence LSO neuron responses to synaptic inputs.
- Dendritic I(h) reduces EPSP integration by locally decreasing input resistance.
Related Concept Videos
01:25Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Hebbian LTP
LTP can occur when presynaptic neurons...
01:35Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
01:29Excitatory and Inhibitory Effects of Neurotransmitters
When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of specific...
01:19The Role of Ion Channels in Neuronal Computation
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
01:28Integration of Synaptic Events
Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...