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Integration of Synaptic Events

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...

Excitatory and Inhibitory Effects of Neurotransmitters

Excitatory 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...

The Synapse

The Synapse

Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.

Synaptic Signaling

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...

Synaptic Signaling

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.

Overview of Synapses

Overview of Synapses

A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...

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Updated: May 7, 2026

Quantifying Synapses: an Immunocytochemistry-based Assay to Quantify Synapse Number

Quantifying Synapses: an Immunocytochemistry-based Assay to Quantify Synapse Number

Published on: November 16, 2010

Growth factors in synaptic function.

Vivian Y Poon¹, Sojoong Choi, Mikyoung Park

¹Neuroscience and Behavioral Disorders Program, Duke-NUS Graduate Medical School Singapore, Singapore.

Frontiers in Synaptic Neuroscience

|September 26, 2013

Summary

Neurotrophic factors like netrin and Wnt are crucial for synaptic function, impacting brain disorders. Understanding their downstream pathways is key to synaptic development and plasticity research.

Keywords:

TGF-β TNF-α Wnt netrin synaptic transmission and plasticity synaptogenesis

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Area of Science:

Neuroscience
Molecular Biology
Cell Biology

Background:

Synaptic dysfunction is implicated in various neurological and psychiatric disorders, including schizophrenia and neurodegenerative diseases.
The synapse is a complex structure critical for neuronal communication, with its development and function being areas of intense research.
Neurotrophic factors are increasingly recognized for their roles beyond neuroprotection, extending to synaptic regulation.

Purpose of the Study:

To review the role of specific neurotrophic factors in synaptic function.
To elucidate the downstream signaling pathways utilized by these factors.
To discuss their impact on synaptic development, transmission, and plasticity.

Main Methods:

Literature review of studies on neurotrophic factors and synaptic function.
Analysis of research on netrin, Wnt, transforming growth factor-β (TGF-β), and tumor necrosis factor-α (TNF-α).
Examination of in vivo and in vitro experimental evidence.

Main Results:

Neurotrophic factors significantly regulate synaptic development, transmission, and plasticity.
These factors employ specific downstream signaling pathways to exert their effects.
Evidence supports their involvement in both normal synaptic function and disease states.

Conclusions:

Neurotrophic factors are vital regulators of synaptic function.
Further research into their downstream effectors is crucial for understanding and treating synaptic-related disorders.
This review consolidates current knowledge on these factors' roles in synaptic biology.