Functional expression and microdomain localization of prestin in cultured cells

Otolaryngol Head Neck Surg. 2007 Mar;136(3):434-9. doi: 10.1016/j.otohns.2006.10.030.


Introduction: Prestin is an essential component of the molecular motor of cochlear outer hair cells that contribute to frequency selectivity and sensitivity of mammalian hearing. A model system to study prestin employs its transfection into cultured HEK 293 cells. Our goal was to characterize prestin's trafficking pathway and localization in the plasma membrane.

Methods: We used immuno-colocalization of prestin with intracellular and plasma membrane markers and sucrose density fractionation to analyze prestin in membrane compartments. Voltage clamping was used to measure nonlinear capacitance (NLC), prestin's electrical signature.

Results & discussion: Prestin targets to the membrane by 24 hours post-transfection when NLC is measurable. Prestin then concentrates into membrane foci that colocalize and fractionate with membrane microdomains. Depleting membrane cholesterol content altered prestin localization and NLC.

Conclusion: Prestin activity in HEK 293 cells results from expression in the plasma membrane and altering membrane lipid content affects prestin localization and activity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Anion Transport Proteins / drug effects
  • Anion Transport Proteins / metabolism
  • Anion Transport Proteins / physiology*
  • Biomarkers / metabolism
  • Cell Line
  • Cell Membrane / metabolism*
  • Cell Membrane / physiology
  • Centrifugation, Density Gradient
  • Cholesterol / metabolism
  • Cholesterol / physiology
  • Electric Capacitance
  • Endoplasmic Reticulum / metabolism
  • Endosomes / metabolism
  • Fluorescent Dyes
  • Golgi Apparatus / metabolism
  • Humans
  • Intracellular Membranes / metabolism
  • Intracellular Membranes / physiology
  • Membrane Lipids / metabolism
  • Membrane Lipids / physiology
  • Membrane Microdomains / drug effects
  • Membrane Microdomains / metabolism*
  • Membrane Microdomains / physiology
  • Patch-Clamp Techniques
  • Protein Transport / physiology
  • Sulfate Transporters
  • Time Factors
  • Transfection
  • beta-Cyclodextrins / pharmacology


  • Anion Transport Proteins
  • Biomarkers
  • Fluorescent Dyes
  • Membrane Lipids
  • SLC26A5 protein, human
  • Sulfate Transporters
  • beta-Cyclodextrins
  • methyl-beta-cyclodextrin
  • Cholesterol