ZFIN ID: ZDB-PUB-080826-10
TRPP2 and TRPV4 form a polymodal sensory channel complex
Köttgen, M., Buchholz, B., Garcia-Gonzalez, M.A., Kotsis, F., Fu, X., Doerken, M., Boehlke, C., Steffl, D., Tauber, R., Wegierski, T., Nitschke, R., Suzuki, M., Kramer-Zucker, A., Germino, G.G., Watnick, T., Prenen, J., Nilius, B., Kuehn, E.W., and Walz, G.
Date: 2008
Source: The Journal of cell biology   182(3): 437-447 (Journal)
Registered Authors: Kramer-Zucker, Albrecht, Wegierski, Tomasz
Keywords: none
MeSH Terms:
  • Animals
  • Calcium Signaling
  • Cell Line
  • Cilia/metabolism
  • Cysts/metabolism
  • Epithelial Cells/metabolism
  • Humans
  • Oocytes/metabolism
  • Protein Binding
  • Protein Transport
  • TRPP Cation Channels/metabolism*
  • TRPV Cation Channels/metabolism*
  • Temperature
PubMed: 18695040 Full text @ J. Cell Biol.
FIGURES
ABSTRACT
The primary cilium has evolved as a multifunctional cellular compartment that decorates most vertebrate cells. Cilia sense mechanical stimuli in various organs, but the molecular mechanisms that convert the deflection of cilia into intracellular calcium transients have remained elusive. Polycystin-2 (TRPP2), an ion channel mutated in polycystic kidney disease, is required for cilia-mediated calcium transients but lacks mechanosensitive properties. We find here that TRPP2 utilizes TRPV4 to form a mechano- and thermosensitive molecular sensor in the cilium. Depletion of TRPV4 in renal epithelial cells abolishes flow-induced calcium transients, demonstrating that TRPV4, like TRPP2, is an essential component of the ciliary mechanosensor. Because TRPV4-deficient zebrafish and mice lack renal cysts, our findings challenge the concept that defective ciliary flow sensing constitutes the fundamental mechanism of cystogenesis.
ADDITIONAL INFORMATION