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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.
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The Synapse02:47

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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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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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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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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 through a 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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Neurons form direct nanotube connections, called dendrite-dendrite nanotubes (DNTs), enabling material exchange and calcium propagation. This newly discovered network may play a role in Alzheimer's disease progression.

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Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Intercellular nanotubular networks facilitate material exchange between cells.
  • The presence and function of such networks in neurons are not well understood.

Purpose of the Study:

  • To investigate the existence and characteristics of nanotubular structures between neurons.
  • To explore the role of these neuronal nanotubes in intercellular communication and disease pathology.

Main Methods:

  • Utilized super-resolution microscopy in dissociated mammalian neurons.
  • Employed imaging and machine learning for in situ analysis of neuronal structures.
  • Developed computational models to simulate nanotube-mediated propagation.

Main Results:

  • Identified and characterized dendrite-dendrite nanotubes (DNTs) in mammalian cortical neurons.
  • Demonstrated DNTs' actin-rich composition, dynamics, and ability to propagate calcium ions (Ca2+).
  • Confirmed DNTs are distinct from synaptic spines and actively transport molecules, including amyloid-beta (Aβ).
  • Observed increased DNT density in APP/PS1 mice preceding amyloid plaque formation.
  • Computational models supported DNTs' role in early amyloidosis.

Conclusions:

  • Discovered a novel layer of nanotubular connectivity in the brain, extending neuronal communication beyond synapses.
  • Suggests that the dendrite-dendrite nanotube network may be implicated in the early stages of Alzheimer's disease pathology.
  • Highlights DNTs as a potential pathway for intercellular propagation of molecules like Aβ.