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Introduction to Fibroblasts01:09

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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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Epithelial-fibroblast interactions in IPF: Lessons from in vitro co-culture studies.

J Brussow1, K Feng1, F Thiam1

  • 1Department of Biology, Okanagan Campus, University of British Columbia, Kelowna, BC, Canada.

Differentiation; Research in Biological Diversity
|September 22, 2023
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Summary

Idiopathic pulmonary fibrosis (IPF) involves lung scarring due to abnormal fibroblast and epithelial cell communication. This review summarizes 3D models studying this epithelial-mesenchymal trophic unit (EMTU) dysfunction in IPF.

Keywords:
Cellular crosstalkCo-culture modelsDifferentiationEpitheliumFibroblastsFibrosisIdiopathic pulmonary fibrosisIn vitro modelsProliferation extracellular matrix (ECM)

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Area of Science:

  • Pulmonary Medicine
  • Cell Biology
  • Tissue Engineering

Background:

  • Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease marked by excessive scarring (fibrosis) and tissue remodeling.
  • Activated fibroblasts and injured pulmonary epithelium crosstalk are key drivers of IPF pathogenesis.
  • This interaction resembles the epithelial-mesenchymal trophic unit (EMTU) crucial for lung development and repair, but is dysregulated in IPF.

Purpose of the Study:

  • To review studies utilizing complex in vitro models to investigate the dysregulated lung EMTU in IPF.
  • To summarize how abnormal epithelial-fibroblast interactions contribute to IPF features.
  • To highlight the role of 3D co-culture and organoid models in understanding IPF.

Main Methods:

  • Review of scientific literature focusing on complex in vitro models.
  • Analysis of studies employing 3-dimensional (3D) co-culture systems.
  • Examination of research utilizing lung organoid models.

Main Results:

  • Complex in vitro models reveal how aberrant epithelial-fibroblast interactions in the EMTU contribute to IPF.
  • These models demonstrate defective cellular differentiation, proliferation, and migration in IPF.
  • Increased extracellular matrix (ECM) deposition, a hallmark of fibrosis, is linked to these interactions.

Conclusions:

  • Complex 3D in vitro and organoid models are valuable tools for studying IPF pathogenesis.
  • Understanding the dysregulated lung EMTU is critical for developing IPF therapies.
  • Aberrant epithelial-fibroblast crosstalk is a central mechanism in IPF progression.