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Related Concept Videos

Neuronal Communication01:28

Neuronal Communication

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Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
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Neurons as Communicators of the Brain01:22

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Neurons, the fundamental units of the brain and nervous system, function as the primary transmitters of information throughout the body. Their ability to communicate through electrical and chemical signals is vital for every bodily function, from regulating the heartbeat to processing complex thoughts. Each neuron has three main components: the cell body (soma), dendrites, and an axon, each specialized to facilitate swift and efficient neural communication.
Cell Body
The cell body, also known...
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The Synapse02:47

The Synapse

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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.
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Synaptic Signaling01:09

Synaptic Signaling

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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.
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The presynaptic neuron fires an action potential that...
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Neuron Structure01:30

Neuron Structure

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Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each other using neurotransmitters at specific junctions called synapses. Neurons come in many shapes that often relate to their function, but most share three main structures: an axon and dendrites that extend out from a cell body.
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Contact-dependent Signaling01:19

Contact-dependent Signaling

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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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Design, Surface Treatment, Cellular Plating, and Culturing of Modular Neuronal Networks Composed of Functionally Inter-connected Circuits
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Intercellular communication in the brain via dendritic nanotubular network.

Minhyeok Chang1, Sarah Krüssel1, Laxmi Kumar Parajuli2

  • 1The Solomon H Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

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Researchers discovered dendritic nanotubes (DNTs), a new neuronal network in the brain. These structures facilitate material exchange and are implicated in Alzheimer's disease pathology.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Intercellular nanotubular networks facilitate material exchange.
  • The presence and function of such networks in mammalian neurons remain largely unexplored.

Purpose of the Study:

  • To identify and characterize nanotubular structures connecting neurons in the mammalian brain.
  • To investigate the role of these structures in neuronal communication and neurodegenerative diseases like Alzheimer's disease (AD).

Main Methods:

  • Super-resolution microscopy to visualize and analyze dendritic nanotubes (DNTs).
  • Machine-learning-based analysis of imaging data for in situ confirmation.
  • Computational simulations to model disease progression.

Main Results:

  • Identified long, thin dendritic filopodia forming direct dendrite-to-dendrite contacts, termed dendritic nanotubes (DNTs).
  • Confirmed DNTs' presence in situ, distinct from synaptic spines, and their role in Ca2+ propagation.
  • Demonstrated DNTs mediate active transport of molecules, including amyloid-beta (Aβ), and their increased levels precede amyloid plaque deposition in AD mouse models.

Conclusions:

  • Unveiled a novel nanotubular network in the brain, expanding the understanding of neuronal connectivity beyond synapses.
  • Highlighted the potential role of the DNT network in Alzheimer's disease pathogenesis and neurodegeneration.
  • Provided insights into the mechanisms of amyloidosis progression mediated by DNTs.