Journal of Neurocytology

, Volume 32, Issue 5–8, pp 803–816

Phosphorylation reactions in activity-dependent synapse modification at the neuromuscular junction during development

  • Phillip G. Nelson
  • Maria A. Lanuza
  • Min Jia
  • Min-Xu Li
  • Josep Tomas
Article

Abstract

We have studied developmental activity-dependent synapse diminution in both an in vitro tissue culture chamber system and at the intact rodent neuromuscular junction (nmj). In both types of preparations, pre- and postsynaptic alterations in synapse structure and function are produced by manipulations of thrombin (Thr) and protein kinase C (PKC) activity. An opposing postsynaptic effect of PKC and protein kinase A (PKA) action on the acetycholine receptor (AChR) can be shown in vitro with PKA stabilizing and PKC destabilizing the nmj synapses. In vivo studies of normal junctional maturation show that changes in axonal inputs and postsynaptic receptor cluster morphology occur, to a substantial degree, independently of one another. Presynaptic actions of PKA are involved in the activity dependent synapse modulation that can be demonstrated in vitro. Late in the elimination process, (>12 days in vivo) the process becomes independent of PKC, implying that diverse, redundant mechanisms are involved in this important developmental process.

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Phillip G. Nelson
    • 1
  • Maria A. Lanuza
    • 2
  • Min Jia
    • 1
  • Min-Xu Li
    • 1
  • Josep Tomas
    • 2
  1. 1.Section on Neurobiology, Laboratory of Developmental NeurobiologyNational Institute of Child Health and Human Development, NIHBethesdaUSA
  2. 2.Unitat d'Histologia i Neurobiologia (UHN) Facultat de Medicina i Ciencies de la SalutUniversitat Rovira i VirgiliReusSpain

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