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The cell-cell channel in the control of growth

W R Loewenstein1, B Rose

  • 1Department of Physiology & Biophysics, University of Miami School of Medicine, FL 33136.

Seminars in Cell Biology
|February 1, 1992
PubMed

Insights

Gap junction channels regulate cell growth by transmitting signals. Enhancing communication inhibits growth, while reducing it, often by oncogenes, stimulates growth, highlighting their crucial role in cell proliferation control.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Gap junctions form cell-to-cell channels facilitating intercellular communication.
  • These channels are implicated in the transmission of growth-regulatory signals.
  • Dysregulation of gap junction communication is linked to abnormal cellular growth and cancer.

Purpose of the Study:

  • To investigate the role of gap junction channels as conduits for growth-regulating signals.
  • To explore the correlation between gap junction communication levels and cellular growth.
  • To provide evidence for the function of gap junction channels in growth control.

Main Methods:

  • Experimental manipulation of gap junction channel expression using retinoids and oncogenes (e.g., activated src).
  • Assessing cellular growth rates in response to altered communication levels.
  • Restoring gap junction communication in transformed, communication-deficient cells by introducing a channel-protein gene.

Main Results:

  • Upregulation of gap junction channels by retinoids inhibited cellular growth.
  • Downregulation of gap junction channels by oncogenes stimulated cellular growth.
  • Restoration of gap junction communication in a transformed cell line normalized both communication and growth.

Conclusions:

  • Gap junction channels are critical conduits for growth-regulating signals.
  • The degree of intercellular communication via gap junctions directly correlates with cellular growth.
  • These findings support a model of growth control involving discrete regulatory centers mediated by gap junctions.

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