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Related Experiment Videos

Multiple connexins colocalize in canine ventricular myocyte gap junctions

H L Kanter1, J G Laing, E C Beyer

  • 1Department of Medicine, Washington University School of Medicine, St Louis, Mo.

Circulation Research
|August 1, 1993
PubMed
Summary

Adult canine heart cells contain three types of gap junction proteins: connexin40 (Cx40), connexin43 (Cx43), and connexin45 (Cx45). These connexins colocalize within the same gap junctions, suggesting complex intercellular communication regulation.

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Area of Science:

  • Cardiovascular Biology
  • Cellular Biology
  • Molecular Cardiology

Background:

  • Adult canine ventricular myocytes express three distinct gap junction channel proteins: connexin40 (Cx40), connexin43 (Cx43), and connexin45 (Cx45).
  • These connexins possess unique cytoplasmic domains, implying connexin-specific physiological properties.

Purpose of the Study:

  • To investigate the distribution of Cx40, Cx43, and Cx45 within canine cardiac myocyte gap junctions.
  • To determine if these connexins are localized in identical or different gap junction populations.

Main Methods:

  • Double-label immunofluorescence microscopy was employed on disaggregated canine ventricular myocytes.
  • Cells were incubated with anti-Cx43 antibodies and either anti-Cx40 or anti-Cx45 antibodies.
  • Laser scanning confocal microscopy and immunoelectron microscopy were used for analysis.

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Main Results:

  • Immunoreactivity patterns for Cx43/Cx40 and Cx43/Cx45 pairs were virtually identical in double-labeled cardiac myocytes.
  • Immunoelectron microscopy confirmed that cardiac myocyte gap junctions contain multiple channel proteins.
  • Cx40, Cx43, and Cx45 were found to colocalize within canine cardiac myocyte gap junctions.

Conclusions:

  • Canine cardiac myocyte gap junctions contain multiple connexin proteins (Cx40, Cx43, and Cx45).
  • The colocalization of these distinct connexins suggests complex possibilities for individual channel composition.
  • This finding implies intricate regulation of intercellular coupling in the heart.