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Updated: Apr 15, 2026

Genetic Manipulation of Cerebellar Granule Neurons In Vitro and In Vivo to Study Neuronal Morphology and Migration
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Neurogranin Promotes Neuronal Maturation and Network Activity Through Ca2+/Calmodulin Signaling.

Elena Martínez-Blanco1, Raquel de Andrés1, Esperanza López-Merino2

  • 1Group of Molecular Basis of Neuronal Plasticity, Departamento de Biología Molecular, Instituto de Biología Molecular (IUBM), Centro de Biología Molecular, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain.

International Journal of Molecular Sciences
|April 14, 2026
PubMed
Summary

Neurogranin (Ng) promotes neuronal maturation and network coordination by enhancing synaptic connections and activity. It also boosts neuronal resilience and metabolic health, integrating calcium signaling with network development.

Keywords:
Neurogranincalciumcalmodulinneuronal maturation

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cellular Biology

Background:

  • Neurogranin (Ng) is a postsynaptic calmodulin-binding protein crucial for synaptic plasticity in forebrain neurons.
  • Its broader role in neuronal network maturation and cellular homeostasis is not fully understood.

Purpose of the Study:

  • To investigate the effects of modulating neurogranin (Ng) levels on primary hippocampal neurons.
  • To elucidate the molecular mechanisms underlying Ng's influence on neuronal structure, function, and homeostasis.

Main Methods:

  • Silencing or restoring Ng expression in primary hippocampal neurons.
  • Utilizing calcium imaging and electrophysiological recordings to assess neuronal activity and network synchronization.
  • Analyzing molecular changes in Ca2+/calmodulin signaling pathways and glutamate receptor expression.

Main Results:

  • Ng expression promoted dendritic expansion, increased synaptic density, and altered axon initial segment positioning.
  • Enhanced spontaneous neuronal activity, network synchronization, burst firing, and spike synchrony were observed.
  • Ng modulated Ca2+/calmodulin signaling, affecting CaMKII abundance and autophosphorylation, and downscaled ionotropic glutamate receptors.
  • Despite increased activity, Ng enhanced neuronal viability, reduced stress, and induced mild caspase-3 activation without apoptosis.

Conclusions:

  • Neurogranin (Ng) drives neuronal maturation and coordinated network activity.
  • Ng engages compensatory mechanisms to maintain excitatory balance and neuronal resilience.
  • Ng acts as a molecular integrator linking Ca2+/calmodulin signaling to neuronal network development.