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Perturbing Endothelial Biomechanics via Connexin 43 Structural Disruption
09:20

Perturbing Endothelial Biomechanics via Connexin 43 Structural Disruption

Published on: October 4, 2019

More insights into the CCN3/Connexin43 interaction complex and its role for signaling

Alexandra Gellhaus1, Christoph Wotzlaw, Teresa Otto

  • 1Institute of Molecular Biology, University of Duisburg-Essen, Hufelandstrasse 55, D-45122 Essen, Germany. alexandra.gellhaus@uk-essen.de

Journal of Cellular Biochemistry
|March 26, 2010
PubMed

Insights

Connexin43 (Cx43) binding to CCN3 upregulates CCN3, reducing placental tumor cell proliferation. Specific Cx43 C-terminus interactions are crucial for this growth regulation signaling pathway.

Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Cancer Research

Background:

  • Connexin43 (Cx43) functions in cell communication and signaling via its C-terminus.
  • Cx43 binding to CCN3 (NOV) has been shown to reduce placental tumor cell proliferation.
  • The precise nature of the Cx43-CCN3 interaction and its downstream effects require further characterization.

Purpose of the Study:

  • To characterize the interaction complex between Connexin43 (Cx43) and CCN3.
  • To determine the specific regions of Cx43 C-terminus involved in CCN3 binding.
  • To correlate Cx43-CCN3 interaction properties with CCN3 expression and cell proliferation.

Main Methods:

  • Fluorescence resonance energy transfer (FRET) to confirm Cx43-CCN3 interaction.
  • Co-immunoprecipitation assays to validate binding interactions.
  • Proliferation and expression assays to assess functional outcomes.

Main Results:

  • FRET and co-immunoprecipitation confirmed CCN3 interaction with wild-type Cx43 and C-terminal deletion mutants.
  • Only wild-type Cx43 and Cx43 (1-374) interaction led to increased CCN3 expression.
  • Increased CCN3 expression, driven by specific Cx43 interactions, correlated with reduced cell proliferation.

Conclusions:

  • Defined binding properties between Cx43 and CCN3, leading to CCN3 upregulation, are essential for Cx43-mediated signaling.
  • The C-terminus of Cx43 plays a critical role in regulating CCN3 expression and cell proliferation.
  • This study provides a structural model for the Cx43 C-terminus interacting with CCN3.

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