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Related Concept Videos

Activation of Integrins01:15

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Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
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Related Experiment Video

Updated: Aug 29, 2025

Isolation of Glomeruli and In Vivo Labeling of Glomerular Cell Surface Proteins
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Integrin α3 negative podocytes: A gene expression study.

L H Frommherz1,2, S B Sayar1, Y Wang1

  • 1Department of Dermatology, Medical Center - University of Freiburg, Freiburg, Germany.

Matrix Biology Plus
|September 5, 2022
PubMed
Summary
This summary is machine-generated.

Integrin α3 loss impairs human podocyte adhesion to laminin 511, disrupting key cellular processes. This finding is crucial for understanding kidney diseases linked to ITGA3 variants.

Keywords:
A3−, integrin alpha3 deficient cells AB8/13 is a conditionally immortalized podocyte cell line carrying a temperature-sensitive T antigen as transgene, in text and figures the abbreviation Podo was used for simplicityCRISPR/Cas9HK2, human kidney-2ILNEBILNEB, interstitial lung disease, nephrotic syndrome and epidermolysis bullosaIntegrin α3KidneyNephrotic syndromePodoA3−, integrin α3 negative podocytesPodocyteSkin blistering

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Nephrology

Background:

  • Integrin α3β1, encoded by ITGA3, is vital for epithelial cell adhesion.
  • Pathogenic ITGA3 variants cause ILNEB syndrome, with renal disease stemming from podocyte adhesion loss.
  • Integrin α3's role in human podocytes remains incompletely understood.

Purpose of the Study:

  • To investigate the functional impact of integrin α3 loss on human podocytes.
  • To characterize gene expression changes in podocytes lacking integrin α3.

Main Methods:

  • CRISPR/Cas9 was used to knock out ITGA3 in human podocyte (AB8/13) and proximal tubule (HK2) cell lines.
  • Cell characterization involved Sanger sequencing, qPCR, Western Blot, and immunofluorescence.
  • RNA sequencing identified differential gene expression in integrin α3-negative cells.

Main Results:

  • Integrin α3-deficient podocytes (PodoA3-) showed reduced spreading and adhesion on laminin 511 under serum-free conditions.
  • Gene expression analysis revealed dysregulation of the adhesion network, with downregulated integrin α3 interaction partners.
  • Key biological processes (ECM organization, cell differentiation) and pathways (ECM-receptor interaction, focal adhesion, PI3K-Akt) were significantly downregulated.

Conclusions:

  • Loss of integrin α3 in human podocytes significantly impairs adhesion and spreading on specific extracellular matrix components.
  • Integrin α3 deficiency leads to widespread molecular changes affecting cell adhesion, extracellular matrix interaction, and signaling pathways.
  • These findings provide insights into the pathogenesis of kidney disease in ILNEB syndrome.