S100B, a neurotropic protein that modulates neuronal protein phosphorylation, is upregulated during lesion-induced collateral sprouting and reactive synaptogenesis

Brain Res. 1998 Nov 30;813(1):211-7. doi: 10.1016/s0006-8993(98)01014-2.


Using light and electron microscopic immunocytochemistry, we examined the expression of the Ca2+-binding protein S100B in the dentate gyrus of adult rats during lesion-induced sprouting and reactive synaptogenesis. Nine days following unilateral lesioning of the entorhinal cortex, S100B was upregulated in cells primarily in the outer part of the molecular layer of the ipsilateral dentate gyrus. When examined with electron microscopy, numerous astrocytes and synapses containing S100B were identified. These data show that during lesion-induced sprouting and reactive synaptogenesis, S100B is upregulated in astrocytes and can be found in pre- and post-synaptic compartments where it might influence neuronal protein phosphorylation.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Calcium-Binding Proteins / physiology*
  • Male
  • Mossy Fibers, Hippocampal / physiology*
  • Nerve Growth Factors / physiology*
  • Neuronal Plasticity / physiology*
  • Neurons / metabolism*
  • Phosphorylation
  • Rats
  • Rats, Sprague-Dawley
  • S100 Calcium Binding Protein beta Subunit
  • S100 Proteins*
  • Synapses / physiology*
  • Up-Regulation


  • Calcium-Binding Proteins
  • Nerve Growth Factors
  • S100 Calcium Binding Protein beta Subunit
  • S100 Proteins
  • S100b protein, rat