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Stimulation side-dependent asymmetrical secretion of poly I:poly C-induced interferon-beta from polarized epithelial

S Okamoto1, K Nakanishi, Y Watanabe

  • 1Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Sakyo-ku, 606-8501, Japan.

Biochemical and Biophysical Research Communications
|January 28, 1999
PubMed

Insights

Poly I:poly C stimulation directs the secretion of interferon (IFN) from epithelial cells. The direction of IFN-beta release depends on where the poly I:poly C is applied, indicating targeted membrane traffic.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Interferons (IFNs) are crucial cytokines in the innate immune response.
  • Epithelial cells play a key role in host defense and barrier function.
  • The secretion pathways of IFN-beta in response to specific stimuli are not fully understood.

Purpose of the Study:

  • To investigate the mode of secretion of poly I:poly C-induced IFN-beta in epithelial cells.
  • To determine if IFN-beta secretion is polarized towards the site of stimulation.

Main Methods:

  • Utilized epithelial cell lines cultured in a bicameral system to separate apical and basolateral compartments.
  • Applied poly I:poly C to either the upper (apical) or lower (basolateral) compartment.
  • Measured IFN-beta secretion from both apical and basolateral membranes.

Main Results:

  • Epithelial cell lines formed tight cell sheets and produced IFN-beta upon poly I:poly C treatment.
  • IFN-beta secretion was predominantly apical when poly I:poly C was applied apically.
  • IFN-beta secretion was preferentially basolateral when poly I:poly C was applied basolaterally.

Conclusions:

  • Poly I:poly C stimulation induces directional intracellular membrane traffic in epithelial cells.
  • Epithelial cells direct IFN-beta secretion towards the side of poly I:poly C exposure.
  • This polarized secretion mechanism may enhance localized immune responses.

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