Synaptopodin and the spine apparatus organelle-regulators of different forms of synaptic plasticity?

Ann Anat. 2012 Jul;194(4):317-20. doi: 10.1016/j.aanat.2011.10.014. Epub 2011 Dec 3.


Synaptopodin (SP) is an actin-binding molecule, which is closely linked with the spine apparatus organelle (SA). Recent experimental evidence suggests that SP containing spines differ in their functional and structural properties from neighboring spines, which do not contain SP. These studies revealed for the first time that SP clusters colocalize with a functional internal source of calcium, which affects synaptic plasticity. Strikingly, SP-cluster associated calcium surges were shown to control synaptic strength in two ways: a ryanodine receptor (RyR) dependent potentiation of synaptic strength was reported, as well as inositol-triphosphate-receptor (IP3R) dependent depression. These results suggested that the SA is an important component of the molecular machinery controlling the calcium-dependent accumulation of AMPA-receptors (AMPA-R) at excitatory synapses. They raise the intriguing possibility that SP/SA could play a role in different forms of synaptic plasticity.

Publication types

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

MeSH terms

  • Animals
  • Calcium / metabolism*
  • Calcium Signaling / physiology*
  • Dendritic Spines / metabolism*
  • Humans
  • Microfilament Proteins / metabolism*
  • Neuronal Plasticity / physiology*
  • Organelles / metabolism*
  • Synapses / metabolism*
  • Tissue Distribution


  • Microfilament Proteins
  • SYNPO protein, human
  • Calcium