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Related Experiment Videos

Enhanced gap junction formation with LDL and apolipoprotein B.

R A Meyer1, P D Lampe, B Malewicz

  • 1Department of Genetics and Cell Biology, University of Minnesota, St. Paul 55108.

Experimental Cell Research
|September 1, 1991
PubMed
Summary

Low-density lipoprotein (LDL) and its component apolipoprotein-B (apo-B) enhance gap junction assembly in Novikoff cells. This modulation of cell-cell communication occurs without altering connexin protein levels.

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Area of Science:

  • Cell biology
  • Biochemistry
  • Molecular biology

Background:

  • Gap junctions facilitate direct cell-cell communication.
  • Intercellular communication relies on gap junction assembly, which can be influenced by external agents.

Purpose of the Study:

  • To investigate the effects of low-density lipoprotein (LDL) on gap junction assembly in cultured Novikoff cells.
  • To determine which components of LDL modulate gap junction formation.

Main Methods:

  • Quantitative dye transfer assays to measure intercellular communication.
  • Freeze-fracture electron microscopy to visualize gap junction particle aggregation.
  • Immunoblotting with anti-connexin43 antibody to assess protein levels.

Main Results:

Related Experiment Videos

  • LDL treatment increased dye transfer and gap junction particle aggregation in a concentration-dependent manner.
  • Cholesterol alone decreased junction assembly, while apolipoprotein-B (apo-B) increased it.
  • No change in connexin protein levels was detected via immunoblotting.

Conclusions:

  • Low-density lipoprotein (LDL) and its component apolipoprotein-B (apo-B) can modulate gap junction assembly.
  • The effects on gap junction formation are independent of changes in overall connexin protein levels.