PKCι interacts with Rab14 and modulates epithelial barrier function through regulation of claudin-2 levels

Ruifeng Lu, Dogukan Dalgalan, Edward K. Mandell, Sara S. Parker, Sourav Ghosh, Jean M. Wilson

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


PKCι is essential for the establishment of epithelial polarity and the normal assembly of tight junctions. We find that PKCι knockdown does not compromise the steadystate distribution of most tight junction proteins but results in increased transepithelial resistance (TER) and decreased paracellular permeability. Analysis of the levels of tight junction components demonstrates that claudin-2 protein levels are decreased. However, other tight junction proteins, such as claudin-1, ZO-1, and occludin, are unchanged. Incubation with an aPKC pseudosubstrate recapitulates the phenotype of PKCι knockdown, including increased TER and decreased levels of claudin-2. In addition, overexpression of PKCι results in increased claudin-2 levels. ELISA and coimmunoprecipitation show that the TGN/endosomal small GTPase Rab14 and PKCι interact directly. Immunolabeling shows that PKCι and Rab14 colocalize in both intracellular puncta and at the plasma membrane and that Rab14 expression is required for normal PKCι distribution in cysts in 3D culture. We showed previously that knockdown of Rab14 results in increased TER and decreased claudin-2. Our results suggest that Rab14 and aPKC interact to regulate trafficking of claudin-2 out of the lysosome-directed pathway.

Original languageEnglish (US)
Pages (from-to)1523-1531
Number of pages9
JournalMolecular biology of the cell
Issue number8
StatePublished - Apr 15 2015

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


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