Secretion polarity of interferon-β in epithelial cell lines

K. Nakanishi, Y. Watanabe, M. Maruyama, F. Yamashita, Y. Takakura, M. Hashida

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Epithelial cells are an attractive target for local gene delivery in gene therapy for which cytokine genes such as interferon (IFN) genes are promising. However, how the secretion of the gene products is regulated in epithelial cells has been insufficiently investigated. Here, we have studied the secretion polarity of IFN-β expressed via gene transfection in mouse epithelial Pam-T cells on a bicameral culture system. In transient expression, IFN-β was predominantly secreted from the cell membrane side on which the transfection was carried out. Meanwhile, the secretion of constitutive IFN-β from stable transformants was apparently unpolarized. Interestingly, the transformants displayed a polarized secretion of transiently expressed IFN-β in a transfection-side-dependent manner, their stable IFN-β secretion remaining unpolarized. These results suggest that epithelial cells have at least dual protein sorting-secretion pathways, transient and stable, for the same secretory proteins, such as IFNs.

Original languageEnglish
Pages (from-to)201-207
Number of pages7
JournalArchives of Biochemistry and Biophysics
Issue number2
Publication statusPublished - Jun 15 2002
Externally publishedYes


  • Epithelial cells
  • Interferon-β
  • Secretion polarity Secretory protein
  • Transfection

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology


Dive into the research topics of 'Secretion polarity of interferon-β in epithelial cell lines'. Together they form a unique fingerprint.

Cite this