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PKC-dependent ERK phosphorylation is essential for P2X7 receptor-mediated neuronal differentiation of neural

H-K Tsao1, P-H Chiu, S H Sun

  • 1Institute of Neuroscience and Brain Research Center, National Yang-Ming University, Taiwan, Republic of China.

Cell Death & Disease
|August 3, 2013
PubMed

Insights

Activation of P2X7 receptors (P2X7Rs) in neural progenitor cells (NPCs) promotes neuronal differentiation. This process involves calcium influx and the PKC-ERK1/2 signaling pathway, highlighting P2X7R

Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Purinergic receptors, specifically P2 receptors, are implicated in neuronal development.
  • The precise roles of individual P2 receptor subtypes, like P2X7 receptors (P2X7Rs), during neurodevelopment are not fully understood.
  • Investigating P2X7R function in neural progenitor cells (NPCs) is crucial for understanding neurodevelopmental mechanisms.

Purpose of the Study:

  • To determine the distribution of P2X7 receptors (P2X7Rs) in the embryonic rat brain.
  • To elucidate the functional roles and underlying molecular mechanisms of P2X7R activation in neural progenitor cells (NPCs).
  • To investigate the signaling pathways involved in P2X7R-mediated neuronal differentiation.

Main Methods:

  • In situ hybridization was used to map P2X7R mRNA expression in embryonic and postnatal rat brains.
  • Primary NPC cultures were established from embryonic rat brains for functional studies.
  • Techniques included calcium imaging, cell proliferation assays, cell cycle analysis, Western blotting for neuronal markers, shRNA-mediated knockdown, and pharmacological inhibition of signaling pathways (PKC, ERK1/2).

Main Results:

  • P2X7R mRNA was detected in neural progenitor cells (NPCs) within the ventricular and subventricular zones of the embryonic brain.
  • P2X7R stimulation in NPCs led to calcium influx, inhibited proliferation, altered cell cycle progression, and promoted neuronal differentiation markers (TUJ1, MAP2).
  • P2X7R activation induced ERK1/2 signaling via PKCα and PKCγ, which was essential for promoting neuronal differentiation and inhibiting glial differentiation (GFAP).

Conclusions:

  • P2X7 receptors are expressed in neural progenitor cells (NPCs) during rat brain development.
  • Activation of P2X7Rs in NPCs stimulates neuronal differentiation through a signaling cascade involving calcium, PKC, and ERK1/2.
  • These findings reveal a novel role for P2X7R in regulating neurogenesis and neuronal fate determination.

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