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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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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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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.
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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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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.
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Generalized minimal principle for rotor filaments.

Hans Dierckx1, Marcel Wellner2, Olivier Bernus3

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Scroll wave filaments in reaction-diffusion systems minimize surface area in higher dimensions. This principle explains filament behavior in cardiac tissue, anchoring in less interconnected regions.

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Area of Science:

  • Reaction-diffusion systems
  • Biophysics
  • Computational cardiology

Background:

  • Scroll wave filaments are key to cardiac arrhythmias.
  • Understanding their dynamics is crucial for treating heart conditions.
  • Anisotropic and inhomogeneous diffusion complicates modeling.

Purpose of the Study:

  • To develop a generalized minimal principle for scroll wave filaments.
  • To explain stationary filament behavior in inhomogeneous anisotropic media.
  • To link filament anchoring to cardiac tissue microstructure.

Main Methods:

  • Introduction of a fourth spatial dimension to the reaction-diffusion medium.
  • Formulation of a generalized minimal principle based on surface area minimization.
  • Derivation of geodesic curves for stationary filaments using a specific metric tensor.
  • Numerical simulations with varying filament tension and spiral core dynamics.

Main Results:

  • Stationary scroll wave filaments are geodesic curves in a higher-dimensional space defined by the diffusion tensor.
  • The theory holds for both positive and negative filament tensions.
  • Numerical simulations confirm the theoretical predictions.
  • Filament anchoring is predicted in regions of lower cellular interconnectivity.

Conclusions:

  • The generalized minimal principle provides a new framework for understanding scroll wave filament dynamics.
  • Filament behavior is governed by the geometry of the diffusion tensor.
  • In cardiac tissue, filaments may anchor in areas with more cleavage planes, influencing arrhythmia stability.