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Related Experiment Videos

PLEKHA7 modulates epithelial tight junction barrier function.

Serge Paschoud1, Lionel Jond1, Diego Guerrera1

  • 1Departments of Cell Biology and Molecular Biology; University of Geneva; Geneva ; Switzerland Institute of Genetics and Genomics of Geneva; University of Geneva; Geneva, Switzerland.

Tissue Barriers
|May 21, 2014
PubMed
Summary
This summary is machine-generated.

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The epithelial protein PLEKHA7 influences tight junction (TJ) barrier dynamics. It affects E-cadherin recruitment and microtubule-dependent mechanisms, modulating TJ assembly and disassembly.

Area of Science:

  • Cell Biology
  • Epithelial Biology
  • Protein Function

Background:

  • The epithelial zonula adhaerens (ZA) is crucial for cell adhesion and tight junction (TJ) integrity.
  • PLEKHA7 is a recently identified protein localized to the ZA, linking it to microtubules.
  • Understanding PLEKHA7's role in TJ barrier function is essential for epithelial biology.

Purpose of the Study:

  • To investigate the role of PLEKHA7 in modulating epithelial tight junction (TJ) barrier function.
  • To determine how PLEKHA7 expression affects TJ protein localization and barrier properties.
  • To elucidate the mechanisms by which PLEKHA7 influences TJ dynamics.

Main Methods:

  • Generation of MDCK cell lines with inducible PLEKHA7 construct expression.
  • Assessment of TJ protein localization, transepithelial resistance (TER), and molecular flux.
Keywords:
PLEKHA7barriercingulinepitheliummicrotubulesparacingulin

Related Experiment Videos

  • Immunoprecipitation to analyze protein complex formation between PLEKHA7 and TJ proteins.

    • Main Results:

    • PLEKHA7 constructs localized to cell junctions, with some showing cytoplasmic distribution.
    • PLEKHA7 expression enhanced E-cadherin recruitment at ZA and PA.
    • PLEKHA7 expression altered TER dynamics, decreasing it at 18h and attenuating the fall after calcium removal, an effect dependent on microtubules.

    Conclusions:

    • PLEKHA7 modulates the dynamics of epithelial TJ barrier assembly and disassembly.
    • Mechanisms involve E-cadherin protein complex and microtubule-dependent pathways.
    • PLEKHA7 is a key regulator of epithelial barrier function.