Altered distribution and co-localization of polycystin-2 with polycystin-1 in MDCK cells after wounding stress

Exp Cell Res. 2004 Jan 1;292(1):219-30. doi: 10.1016/j.yexcr.2003.08.019.

Abstract

Polycystin-1 and -2 are integral membrane glycoproteins defective in autosomal dominant polycystic kidney disease (ADPKD). Recent studies showed a coupled polycystin-1 and -2 action in cell signaling and channel activation suggesting an important biological role for the two proteins at the plasma membrane. To gain a better understanding about the (co)-distribution and dynamics of the polycystin-1 and -2 complex under stress conditions, we used a wound-healing model of Madine Darby canine kidney (MDCK) renal epithelial cells. In this model, cells near the wound edge undergo a process of reorganization to active migration, while cells further from the edge are unaffected and remain confluent. For the first time, endogenous polycystin-1 and -2 were found to partly co-localize in the plasma membrane of confluent monolayers, and both proteins co-localized in the primary cilium. Upon wound healing, the association of polycystin-2 to the membrane was greatly reduced at the wound edge and the submarginal cells. Polycystin-1 remained incorporated to the membrane at the edge of the cell sheet at all time points, although strongly reduced in lamellipodia-forming cells. Adherens junctions and desmosomes, and respective connected actin and keratin cytoskeleton were also disturbed in lamellipodia-forming cells. We propose that altered subcellular localization of polycystin-1 and -2 as a result of stress will affect signaling and other cellular processes mediated by these proteins.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies, Monoclonal / metabolism
  • Cell Line
  • Cell Membrane / metabolism
  • Cilia / metabolism
  • Cytoskeleton / metabolism
  • Desmosomes / metabolism
  • Dogs
  • Epithelial Cells / metabolism*
  • Kidney / cytology*
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism*
  • Polycystic Kidney, Autosomal Dominant / genetics
  • Polycystic Kidney, Autosomal Dominant / metabolism
  • Proteins / genetics
  • Proteins / metabolism*
  • TRPP Cation Channels
  • Time Factors
  • Tissue Distribution
  • Wound Healing / immunology*

Substances

  • Antibodies, Monoclonal
  • Membrane Proteins
  • Proteins
  • TRPP Cation Channels
  • polycystic kidney disease 1 protein
  • polycystic kidney disease 2 protein