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Related Concept Videos

Synaptic Signaling01:12

Synaptic Signaling

Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Long-term Potentiation01:35

Long-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.
Synaptic Signaling01:09

Synaptic Signaling

Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
Long-term Potentiation01:25

Long-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...
Postsynaptic Potential (PSP)01:32

Postsynaptic Potential (PSP)

Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
Integration of Synaptic Events01:28

Integration 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...

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Improved Preparation and Preservation of Hippocampal Mouse Slices for a Very Stable and Reproducible Recording of Long-term Potentiation
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Mechanisms for temporal tuning and filtering by postsynaptic signaling pathways.

Upinder S Bhalla1

  • 1National Centre for Biological Sciences, Gandhi Krishi Vigyan Kendra Campus, Bangalore 560065, India. bhalla@ncbs.res.in

Biophysical Journal
|July 19, 2002
PubMed
Summary

This study reveals two key mechanisms, weighted summation and feedback loops, that enable biological signaling pathways to precisely tune their temporal responses for complex information processing in cells. These findings advance our understanding of cellular temporal decoding.

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Area of Science:

  • Systems biology
  • Cellular signaling
  • Biophysics

Background:

  • Signaling pathways are crucial for biological processes like synaptic function and development.
  • These networks exhibit complex temporal decoding capabilities.
  • Understanding the mechanisms behind this temporal tuning is essential.

Purpose of the Study:

  • To investigate the temporal filtering and tuning properties of synaptic signaling pathways.
  • To explore how these pathways contribute to emergent temporal decoding.
  • To identify the fundamental mechanisms underlying temporal tuning in biological signaling networks.

Main Methods:

  • Development of a mass action kinetic model.
  • Simulation of 16 synaptic signaling pathways.
  • Analysis of pathways in linear cascades and networked configurations.

Main Results:

  • Identified two primary mechanisms for temporal tuning: weighted summation of responses and biochemical feedback loops.
  • Demonstrated that regulatory inputs modulate these tuning mechanisms differently.
  • Feedback loops alter their own temporal properties, while regulators act as gain controls on intrinsic pathway tuning.

Conclusions:

  • Basic temporal tuning mechanisms involving weighted summation and feedback loops are fundamental to biological signaling.
  • These mechanisms provide a substrate for specialized temporal tuning functions in complex cellular systems.
  • The findings offer insights into how cells process information over time through signaling networks.