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Related Concept Videos

Gap Junctions01:37

Gap Junctions

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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Related Experiment Video

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Connexin 43-Enriched Vesicles Improve Synchronization in hiPSC-Derived Cardiomyocytes.

Nima Momtahan1, Anna K McClain1, Andrea Trementozzi1

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Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary

Researchers developed Connectosomes, specialized vesicles, to improve communication in immature heart cells. These vesicles enhance cell synchronization and electrical coupling, paving the way for new cardiac therapies.

Keywords:
biovesiclescardiomyocyteshiPSCssynchronization

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Area of Science:

  • Cardiovascular Research
  • Stem Cell Biology
  • Biotechnology

Background:

  • Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) are crucial for studying cardiac cell communication.
  • However, hiPSC-CMs exhibit immaturity, leading to poor electrical and mechanical coupling.
  • Enhancing gap junction-mediated communication is essential for functional cardiomyocyte networks.

Purpose of the Study:

  • To investigate methods for improving intercellular coupling in hiPSC-CMs.
  • To develop and characterize Connectosomes, plasma membrane vesicles enriched in functional connexin hemichannels.
  • To assess the efficacy of Connectosomes in enhancing cardiomyocyte synchronization and coordination.

Main Methods:

  • Development of Connectosomes from plasma membrane vesicles enriched in connexin hemichannels.
  • Characterization of Connectosome orientation and connexin-43 (Cx43) expression.
  • Mathematical modeling and experimental validation of Connectosome incorporation.
  • Assessment of calcium transients and beating coordination in cardiomyocyte networks.

Main Results:

  • Connectosomes demonstrated proper orientation of connexins and enriched Cx43 at cardiomyocyte borders.
  • Connectosome incorporation reinforced endogenous gap junctions and promoted synchronous calcium transients.
  • Improved spatial coordination of beating was observed across cardiomyocyte networks.
  • Mechanistic studies confirmed the critical role of connexin channel orientation and functionality.

Conclusions:

  • Connectosomes effectively enhance gap junction-mediated communication in immature cardiomyocytes.
  • These vesicles synchronize cardiomyocyte beating by boosting electrochemical communication.
  • Connectosomes represent a promising strategy for advancing cardiac cell therapy and regenerative medicine.