Consequences of membrane topography

FEBS J. 2013 Jun;280(12):2775-84. doi: 10.1111/febs.12209. Epub 2013 Mar 21.

Abstract

The surface of mammalian cells is neither smooth nor flat and cells have several times more plasma membrane than the minimum area required to accommodate their shape. We discuss the biological function of this apparent excess membrane that allows the cells to migrate and undergo shape changes and probably plays a role in signal transduction. Methods for studying membrane folding and topography--atomic force microscopy, scanning ion conductance microscopy, fluorescence polarization microscopy and linear dichroism--are described and evaluated. Membrane folding and topography is frequently ignored when interpreting microscopy data. This has resulted in several misconceptions regarding for instance colocalization, membrane organization and molecular clustering. We suggest simple ways to avoid these pitfalls and invoke Occam's razor--that simple explanations are preferable to complex ones. Topography, i.e. deviations from a smooth surface, should always be ruled out as the cause of anomalous data before other explanations are presented.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • Cell Membrane / ultrastructure*
  • Cells, Cultured
  • Humans
  • Membrane Proteins / metabolism
  • Membrane Proteins / ultrastructure
  • Microscopy, Atomic Force
  • Microscopy, Polarization
  • Models, Biological
  • Single-Cell Analysis

Substances

  • Membrane Proteins