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Related Concept Videos

The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

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The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm).  These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate...
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Types of Intermediate Filaments01:31

Types of Intermediate Filaments

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The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and II are acidic and basic keratin proteins. Type III is of mesodermal origin and comprises four proteins: vimentin, desmin, glial fibrillary acidic protein (GFAP), and peripherin. Vimentin is commonly found in mesenchymal cells, desmin in muscle cells, GFAP in astrocytes, while peripherin is found in peripheral nervous system neurons (PNS). Type...
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Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

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Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
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Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
2.7K
Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

6.2K
The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Related Experiment Video

Updated: Mar 1, 2026

Visualization of the Axonal Projection Pattern of Embryonic Motor Neurons in Drosophila
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The third wave: Intermediate filaments in the maturing nervous system.

Matthew T K Kirkcaldie1, Samuel T Dwyer1

  • 1School of Medicine, Wicking Dementia Research and Education Centre, Faculty of Health, University of Tasmania, Australia.

Molecular and Cellular Neurosciences
|May 31, 2017
PubMed
Summary

Intermediate filaments, including neurofilaments, are essential for neuron structure and function, ensuring efficient long-distance communication and adaptability throughout life. This protein network provides critical support for neuronal integrity and plasticity.

Keywords:
Neurofilamentscytoskeletondevelopmentintermediate filamentsmyelinplasticity

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Structural Biology

Background:

  • Intermediate filaments are crucial for neuronal structural specialization.
  • They provide integrity in dynamic neuronal environments and support long axons.
  • Expression of intermediate filament proteins changes during neuronal maturation.

Purpose of the Study:

  • To elucidate the role of intermediate filaments in neuronal structure and function.
  • To describe the dynamic changes in intermediate filament composition during neuronal development and maturation.
  • To understand how these proteins contribute to axonal and dendritic structural transformation and functional acquisition.

Main Methods:

  • Analysis of intermediate filament protein expression patterns during neuronal development.
  • Investigating the assembly, transport, and stabilization of these proteins in axons and dendrites.
  • Examining the interaction between neurons and myelinating glial cells.

Main Results:

  • Early expression of nestin and vimentin transitions to neurofilament triplet proteins, α-internexin, and peripherin.
  • These proteins physically consolidate axons during elongation and target finding.
  • Post-connection, protein transport, assembly, and modification structurally transform neurons.
  • Interactions with glial cells optimize axonal structure for peak efficiency.

Conclusions:

  • Intermediate filaments are vital for neuronal structural integrity and function, especially in long axons.
  • Dynamic regulation of these proteins underlies neuronal maturation and functional adaptation.
  • Optimized axonal structure, supported by glial interactions, ensures precise neural communication and plasticity.