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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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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
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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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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
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Overview of Secretory Vesicles01:33

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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Extracellular vesicles and intercellular communication within the nervous system.

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    Extracellular vesicles (EVs) transfer information via proteins and nucleic acids, impacting nervous system development, function, and disease. Research explores their role in brain wiring, plasticity, regeneration, and potential as biomarkers and therapeutics.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Biochemistry

    Background:

    • Extracellular vesicles (EVs), including exosomes, are crucial for intercellular communication in the nervous system.
    • They transport proteins and nucleic acids, influencing synaptic function, development, and neurodegeneration.
    • EVs play roles in regulating synaptic communication, strength, and nerve regeneration.

    Purpose of the Study:

    • To review the current understanding of extracellular vesicles (EVs) in the nervous system.
    • To highlight the significance of EVs in brain development, function, plasticity, and disease.
    • To explore the potential applications of EVs as biomarkers and therapeutics.

    Main Methods:

    • This review synthesizes current research on extracellular vesicles (EVs).
    • It examines the molecular cargo and mechanisms of EV-mediated intercellular communication.
    • The review discusses the involvement of EVs in nervous system development, function, and pathology.

    Main Results:

    • EVs facilitate the transfer of nonsecreted proteins and nucleic acids, acting as information packets.
    • They are vital for transporting cell-fate proteins during development and misfolded proteins in disease.
    • EVs contribute to orchestrating neural wiring, learning, memory, and regeneration/degeneration processes.

    Conclusions:

    • EVs represent a key mechanism for multidimensional cellular crosstalk in the nervous system.
    • Their involvement in both normal brain function and neurodegenerative diseases is under active investigation.
    • EVs hold significant promise as biomarkers and therapeutic agents for neurological disorders.