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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.
Intracellular Signaling Cascades01:24

Intracellular Signaling Cascades

Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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...
Microtubules in Signaling01:22

Microtubules in Signaling

The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...

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Related Experiment Video

Updated: Jul 19, 2026

Using Primary Neurosphere Cultures to Study Primary Cilia
08:14

Using Primary Neurosphere Cultures to Study Primary Cilia

Published on: April 14, 2017

The neuronal primary cilium--an extrasynaptic signaling device.

J F Whitfield1

  • 1Institute for Biological Sciences, National Research Council of Canada, Building M-54, Montreal Road Campus, Ottawa, Ontario, Canada. pthosteo@rogers.com

Cellular Signalling
|April 30, 2004
PubMed
Summary

Neurons possess primary cilia, antenna-like structures crucial for cell signaling. These cilia, previously overlooked, are now recognized for their role in brain functions and potential involvement in neurological disorders.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Most central nervous system neurons feature a primary cilium, a nonmotile organelle extending into the extracellular space.
  • Historically, primary cilia were often disregarded, but known roles in photoreceptor outer segments and kidney flow sensing highlight their importance.
  • Specific receptors, like somatostatin sst3 and serotonin 5-HT(6), are found on neuronal primary cilia in the rat brain.

Purpose of the Study:

  • To investigate the potential signaling functions of neuronal primary cilia.
  • To explore the role of selectively receptored primary cilia in brain functions.
  • To propose neuronal primary cilia as key components in intercellular communication.

Main Methods:

  • Literature review and synthesis of existing research on primary cilia.
  • Analysis of receptor localization studies in the rat brain.
  • Hypothesizing signaling mechanisms involving primary cilia.

Main Results:

  • Primary cilia are widespread in neurons and possess sensory functions.
  • Selective receptor localization on neuronal primary cilia suggests specialized roles.
  • These cilia are implicated in intercellular communication via gap junctions and chemical synapses.

Conclusions:

  • Neuronal primary cilia are not mere relics but active signaling devices.
  • They likely play a critical role in regulating diverse brain functions.
  • Further research into these structures may reveal insights into neurological diseases.