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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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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Observing and Quantifying Fibroblast-mediated Fibrin Gel Compaction
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Fibrillin-containing microfibrils are key signal relay stations for cell function.

Karina A Zeyer1, Dieter P Reinhardt2

  • 1Faculty of Medicine, Department of Anatomy and Cell Biology, and Faculty of Dentistry, McGill University, 3640 University Street, Montreal, Quebec, H3A 0C7, Canada.

Journal of Cell Communication and Signaling
|October 10, 2015
PubMed
Summary

Fibrillins are key to extracellular matrix microfibrils, impacting tissue structure and cell signaling. Understanding fibrillin signaling offers new therapeutic avenues for connective tissue disorders like Marfan syndrome.

Keywords:
Cell signalingConnective tissue disordersFibrillinIntegrinsMatrix metalloproteinasesMicroRNAMicrofibrils

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Fibrillins form microfibrils, essential components of the extracellular matrix in various tissues.
  • Mutations in fibrillins cause connective tissue disorders, notably Marfan syndrome.
  • Microfibrils play dual roles in structural support and cellular signaling.

Purpose of the Study:

  • To review signaling mechanisms initiated by fibrillins and microfibrils.
  • To explore how these mechanisms are dysregulated in fibrillin-associated disorders.
  • To highlight the therapeutic potential of understanding fibrillin-mediated signaling.

Main Methods:

  • Literature review focusing on fibrillin and microfibril signaling pathways.
  • Analysis of the role of fibrillins in regulating growth factor bioavailability (e.g., TGF-β superfamily).
  • Examination of cellular sensing of microfibrils via integrins and other receptors.

Main Results:

  • Fibrillins and microfibrils are critical regulators of cellular signaling pathways.
  • Dysregulation of fibrillin signaling contributes to connective tissue disorder pathogenesis.
  • Fibrillins influence immune response, inflammation, and tissue homeostasis.
  • MicroRNAs are implicated in disorders arising from fibrillin deficiency.

Conclusions:

  • Fibrillin-mediated cell signaling is crucial for tissue homeostasis and development.
  • Disrupted fibrillin signaling pathways are central to fibrillin-associated disorders.
  • Targeting fibrillin signaling pathways presents promising therapeutic strategies for connective tissue diseases.