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Related Concept Videos

Nervous Tissue: Neuron Types01:19

Nervous Tissue: Neuron Types

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Neurons, the fundamental units of the nervous system, can be classified based on both their structural and functional characteristics.
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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
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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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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
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Automatic Identification of Dendritic Branches and their Orientation
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Precursor types predict the stability of neuronal branches.

Joachim Fuchs1, Britta J Eickholt1

  • 1Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Molecular Biology and Biochemistry, Virchowweg 6, 10117 Berlin, Germany.

Journal of Cell Science
|November 12, 2021
PubMed
Summary

Neuron branches emerge from different precursors, with filopodia-initiated branches persisting longer than others. The protein PLPPR3 and netrin-1 promote these stable, filopodia-initiated neuron branches.

Keywords:
Directed acyclic graphsFilopodiumLamellipodiumNeuron branch stabilityPLPPR3PRG2Survival analysis

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Neuron branching is crucial for forming complex neural networks.
  • Branches arise from distinct cytoskeletal precursor structures.
  • Cytoskeletal regulators are thought to maintain branches uniformly.

Purpose of the Study:

  • To investigate if different precursor structures trigger alternative branch maintenance mechanisms.
  • To determine the role of phospholipid phosphatase-related protein 3 (PLPPR3) and netrin-1 in branch stability.
  • To elucidate the mechanisms underlying axon branch stabilization.

Main Methods:

  • Utilized mouse hippocampal neurons.
  • Observed branch stability differences based on precursor structures (lamellipodia, growth cone splitting, filopodia).
  • Examined neurons lacking PLPPR3 and neurons treated with netrin-1.

Main Results:

  • Branches from filopodia exhibit greater stability compared to those from lamellipodia or growth cone splitting.
  • Axons preferentially initiate and stabilize branches from filopodia.
  • PLPPR3 and netrin-1 enhance branch stability indirectly by promoting a 'filopodia branch programme' on axons.

Conclusions:

  • Neuron branch maintenance mechanisms differ based on their precursor structures.
  • Axon branch stabilization involves preferential initiation from filopodia.
  • PLPPR3 and netrin-1 modulate branch stability by influencing the filopodia-initiated branch program, not by direct stabilization.