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Related Concept Videos

Fibronectins Connect Cells with ECM01:25

Fibronectins Connect Cells with ECM

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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 skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among resident skin cells, blood mononuclear cells, extracellular matrix, growth factors, and cytokines to complete the healing cascade.
Formation of Blood Clot
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Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
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Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own...
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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Related Experiment Video

Updated: May 9, 2025

Murine Dermal Fibroblast Isolation by FACS
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Epithelial Fibronectin Meshwork Controls Skin Regeneration.

Soline Estrach1, Charles-Maxime Vivier1, Lionel Tosello1

  • 1Université Côte d'Azur, INSERM, CNRS, IRCAN, Nice, France.

The Journal of Investigative Dermatology
|May 2, 2025
PubMed
Summary
This summary is machine-generated.

Fibronectin (FN) is crucial for adult stem cell (SC) regeneration in hair follicles. This study reveals FN’s role in maintaining SC fate and enabling tissue repair through integrin-mediated mechanotransduction.

Keywords:
FibronectinHair follicle stem cellsMechanosignalingMeshwork: Tissue regeneration

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Area of Science:

  • Stem cell biology
  • Dermatology
  • Regenerative medicine

Background:

  • Adult stem cell (SC) fate is regulated by the microenvironment (niche), crucial for tissue regeneration.
  • Fibronectin (FN), a major extracellular matrix component, is known for its role in wound healing.
  • The integration of niche signals in regeneration remains largely unexplored.

Purpose of the Study:

  • To investigate the previously unreported role of Fibronectin (FN) in epidermal regeneration.
  • To understand how niche signals, specifically FN, regulate hair follicle stem cell (HFSC) fate and tissue repair.

Main Methods:

  • Utilized the hair follicle as a model mini-organ for regeneration studies.
  • Generated conditional FN deletion in hair follicle SC compartments (LRIG1, keratin 19).
  • Analyzed the effects of FN loss on SC location, fate, and hair regeneration, including rescue experiments with exogenous FN.

Main Results:

  • Discovered specific enrichment of FN in SCs during hair follicle regeneration, forming a meshwork.
  • Demonstrated that conditional FN deletion impairs SC location and fate, leading to hair regeneration blockade.
  • Showed that dermal injection of exogenous FN rescues these regeneration defects.

Conclusions:

  • Fibronectin (FN) plays a critical, previously unrecognized role in hair follicle regeneration.
  • FN, through integrin-dependent mechanotransduction (YAP/Taz), finely tunes adult SC fate and tissue regenerative power in epithelial cells.