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Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
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Hypoxia Promotes Invadosome Formation by Lung Fibroblasts.

Mégane Lebel1, Dominic O Cliche1, Martine Charbonneau2

  • 1Respiratory Division, Department of Medicine, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada.

Cells
|July 12, 2024
PubMed
Summary
This summary is machine-generated.

Hypoxia promotes fibrotic lung disease by increasing fibroblast invadosome formation via lysophosphatidic acid receptor 1 (LPA1) signaling. Inhibiting LPA1 may offer a new therapeutic strategy for idiopathic pulmonary fibrosis (IPF).

Keywords:
LPA1fibroblastshypoxia 2idiopathic pulmonary fibrosisinvadosomes LPAnintedanib

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Area of Science:

  • Cell Biology
  • Pulmonary Medicine
  • Molecular Signaling

Background:

  • Idiopathic pulmonary fibrosis (IPF) is characterized by lung parenchymal hypoxia.
  • Hypoxia and lysophosphatidic acid (LPA) receptor 1 (LPA1) signaling are implicated in cancer metastasis and lung fibrogenesis.
  • IPF fibroblasts exhibit enhanced invadosome formation, correlating with fibrosis severity.

Purpose of the Study:

  • To investigate whether hypoxia promotes invadosome formation in lung fibroblasts via LPA1-dependent signaling.
  • To explore the molecular mechanisms linking hypoxia, LPA1, and fibroblast activation in IPF.

Main Methods:

  • Fibroblasts from IPF lungs were treated with nintedanib or LPA1 inhibitors.
  • Normal human lung fibroblasts were exposed to hypoxia or LPA.
  • Invadosome formation was assessed, and signaling pathways (LPA1, PDGFR-Akt) were analyzed.

Main Results:

  • Inhibition of LPA1 and nintedanib reduced invadosome formation in IPF fibroblasts.
  • Hypoxia and LPA exposure increased invadosome formation in normal lung fibroblasts.
  • Hypoxia-induced invadosome formation involved LPA1 and PDGFR-Akt signaling.

Conclusions:

  • Hypoxia stimulates lung fibroblast invadosome formation through the LPA1 and PDGFR-Akt signaling axis.
  • Targeting the LPA1 signaling pathway presents a potential therapeutic strategy for mitigating lung fibrosis in IPF.