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Nontransformed cells can normalize gap junctional communication with transformed cells.
Virginijus Valiunas1, John F Bechberger, Christian C G Naus
1Department of Physiology and Biophysics, School of Medicine, Basic Science Tower L6, Health Science Complex, State University of New York at Stony Brook, 11794-8661, USA. vvaliunas@notes.cc.sunysb.edu
Biochemical and Biophysical Research Communications
|June 7, 2005
Summary
The Src kinase enhances gap junction communication in cells lacking connexin 43 (Cx43). Adjacent normal cells can normalize the altered gap junction conductance of tumor cells.
Area of Science:
- Cell biology
- Biophysics
- Molecular oncology
Background:
- Gap junctions mediate direct cell-to-cell communication.
- Connexin 43 (Cx43) is a key protein forming gap junction channels.
- Dysregulation of Cx43 and gap junction communication is implicated in cancer.
Purpose of the Study:
- To investigate the role of Src kinase in modulating gap junction communication in Cx43-deficient cells.
- To determine how Src transformation affects gap junction conductance.
- To assess the interaction between normal and Src-transformed cells regarding gap junction function.
Main Methods:
- Utilized cells derived from homozygous Cx43 knockout mice.
- Compared gap junctional communication and conductance in nontransformed versus Src-transformed cells.
- Analyzed single channel events and conductance properties.
Main Results:
- Src kinase significantly augmented total gap junctional conductance in Cx43-deficient cells.
- Src-transformed cells exhibited nearly double the total conductance and ~35% greater unitary conductance compared to nontransformed cells.
- Heterologous cell pairs showed that nontransformed cells normalized the conductance of adjacent Src-transformed cells.
Conclusions:
- Src kinase up-regulates gap junction communication, potentially by affecting channel populations or unitary conductance.
- Normal cells possess a mechanism to normalize altered gap junction function in adjacent tumor cells.
- Findings suggest a potential therapeutic strategy targeting cell-cell communication in cancer.