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Related Concept Videos

Fibronectins Connect Cells with ECM01:25

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Fibronectin is an adhesive glycoprotein present in the extracellular matrix of embryogenic and adult tissue. These molecules primarily aid in regulating cell motility and attachment. A fibronectin molecule is composed of two identical polypeptide chains attached to each other by a pair of disulfide bonds at the C-terminal.
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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Overview
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Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
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ECM Protein Nanofibers and Nanostructures Engineered Using Surface-initiated Assembly
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Fibronectin matrix assembly at a glance.

Yu Sun1, Aaron J Hamlin1, Jean E Schwarzbauer1

  • 1Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA.

Journal of Cell Science
|March 25, 2025
PubMed
Summary
This summary is machine-generated.

Extracellular matrix (ECM) protein assembly, particularly fibronectin (FN) fibril formation, is crucial for tissue structure. Understanding these cell-mediated mechanisms reveals insights into disease progression.

Keywords:
AssemblyExtracellular matrixFibrillogenesisFibronectin

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biomaterials Science

Background:

  • The extracellular matrix (ECM) provides structural support and regulates cellular functions.
  • Fibronectin (FN) is a key ECM protein essential for tissue organization and repair.
  • Cell-mediated assembly processes govern the formation of functional ECM networks.

Purpose of the Study:

  • To elucidate the domain organization of fibronectin (FN).
  • To describe the mechanisms initiating and propagating insoluble FN fibril networks.
  • To discuss intracellular pathways regulating FN assembly and its role in disease.

Main Methods:

  • Review of existing literature on fibronectin structure and assembly.
  • Analysis of cell-mediated mechanisms in ECM formation.
  • Discussion of intracellular signaling pathways impacting FN matrix assembly.

Main Results:

  • Fibronectin (FN) is organized into domains that facilitate its assembly into fibrillar matrices.
  • Receptor-mediated processes initiate and propagate the formation of stable, insoluble FN fibrils.
  • Intracellular pathways play a critical role in regulating the assembly of the FN matrix.

Conclusions:

  • The specific mechanisms of fibronectin (FN) assembly are vital for generating tissue-appropriate matrices.
  • Dysregulation of FN matrix assembly can significantly impact disease progression.
  • Understanding FN assembly provides a foundation for developing therapeutic strategies targeting ECM-related disorders.