Differential Involvement of beta3 Integrin in Pre- And Postsynaptic Forms of Adaptation to Chronic Activity Deprivation

Neuron Glia Biol. 2008 Aug;4(3):179-87. doi: 10.1017/S1740925X0999024X. Epub 2009 Sep 16.


Neuronal networks can adapt to global changes in activity levels through compensatory modifications in pre- and postsynaptic parameters of synaptic transmission. These forms of synaptic plasticity are known as synaptic homeostasis, and are thought to require specific cellular interactions and signaling across the entire neuronal network. However, the molecular mechanisms underlying synaptic homeostasis have so far been investigated mostly in primary cultures of dissociated neurons, a preparation that lacks the specificity of in vivo circuitry. Here, we show that there are critical differences in the properties of synaptic homeostasis between dissociated neuronal cultures and organotypic slices, a preparation that preserves more precisely in vivo connectivity. Moreover, the cell adhesion molecule beta3 integrin, which regulates excitatory synaptic strength, is specifically required for a postsynaptic form of synaptic homeostasis called synaptic scaling in both dissociated cultures and organotypic slices. Conversely, another form of synaptic homeostasis that involves changes in presynaptic quantal content occurs independently of beta3 integrin. Our findings define the differential involvement of beta3 integrin in two forms of synaptic homeostasis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptation, Physiological / physiology*
  • Analysis of Variance
  • Animals
  • Animals, Newborn
  • Cells, Cultured
  • Embryo, Mammalian
  • Excitatory Postsynaptic Potentials / drug effects
  • Excitatory Postsynaptic Potentials / genetics
  • Excitatory Postsynaptic Potentials / physiology*
  • Hippocampus / cytology
  • Integrin beta3 / genetics
  • Integrin beta3 / metabolism*
  • Mice
  • Mice, Knockout
  • Neurons / drug effects
  • Neurons / physiology*
  • Organ Culture Techniques
  • Patch-Clamp Techniques / methods
  • Sodium Channel Blockers / pharmacology
  • Synapses / drug effects
  • Synapses / genetics
  • Synapses / physiology*
  • Tetrodotoxin / pharmacology


  • Integrin beta3
  • Sodium Channel Blockers
  • Tetrodotoxin