Axonal Extension
Axonal Extension - Related Videos
11:46
Axon Stretch Growth: The Mechanotransduction of Neuronal Growth
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Cited by 30 •
2011
A unique tissue engineering method was developed to elongate numerous nerve fibers in culture by recapitulating axon stretch growth; a form of nervous system growth whereby nerves elongate in conjunction with growth of the enlarging body.
03:24
Two-Photon Laser Axotomy: A Method to Injure Axons in Zebrafish Embryos and Observe Axonal Recovery
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2023
This video describes the method to injure axons in zebrafish embryos using two photon laser axotomy and observing axonal recovery from injury.
28:40
Proboscis Extension Response (PER) Assay in Drosophila
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Cited by 120 •
2007
Proboscis extension response or PER is a taste behavior assay that has been used in flies as well as in honeybees. When the proboscis makes contact with an attractive substance, the fly extends its proboscis to consume the substance. Solutions of various sugars are very attractive to the fly.
03:32
Using a Macrophage Conditioned Medium to Promote Neuron Extensions
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2025
This video demonstrates an assay for promoting the growth of neuron projections known as neurite outgrowth using the macrophage-conditioned medium. Co-culture neurons and macrophages with cAMP and harvest the macrophage-derived conditioned medium. Growing the neurons with the conditioned medium promotes neurite outgrowths. These outgrowths are fluorescently labeled and visualized using a fluorescence microscope.
10:02
Mechanical Manipulation of Neurons to Control Axonal Development
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Cited by 10 •
2011
Application and direct measurements of forces on neurons in the 2-1000 microdyne range are achieved with high precision using calibrated glass needles. This methodology can be used to control and measure several aspects of axonal development, including axonal initiation, axonal tension, velocity of axonal elongation, and force vectors.
FAQs
Actin remodeling and microtubule advance make complementary contributions. Actin changes support membrane protrusion at the motile growth cone, while microtubules assemble and move forward through the elongating axonal shaft. Studying these coordinated behaviors helps explain how a neuron converts external guidance information into directed structural growth rather than treating extension as simple expansion of the cell.
At the axon tip, the growth cone provides the motile interface between the neuron and its extracellular environment. It senses guidance cues and links that information to local structural changes, including actin-driven protrusion. This makes the growth cone a key site for investigating how external signals influence the direction and progression of axonal growth during circuit formation.
Researchers can vary substrate composition, growth factors, and inhibitory signals to test how the surrounding environment affects extension. These variables provide experimentally distinct ways to ask whether growth is being supported, promoted, or constrained. Comparing responses under controlled conditions can reveal which environmental features are associated with axonal growth and which may impede neural repair after injury.
A practical strategy is to observe axonal growth while changing one relevant environmental condition, such as substrate composition, growth-factor availability, or inhibitory signaling. The resulting extension can then be compared across conditions to identify relationships between the manipulated factor and axonal behavior. This approach connects cellular growth responses with mechanisms relevant to developmental connectivity and regeneration research.
In developmental neurobiology, investigators examine axonal extension to understand how neurons establish functional neural circuits. Attention can focus on how growth cones respond to extracellular guidance cues and how cytoskeletal changes support advancement. The resulting observations help connect cellular events with the larger biological outcome of appropriate neuronal connectivity.
In injury research, axonal extension provides a framework for identifying conditions that support axon regeneration after damage. Manipulating substrates, growth factors, or inhibitory signals allows researchers to test environmental influences on regrowth. The broader goal is to determine whether altered conditions can help restore connectivity and, ultimately, functional neural communication.