Monocular Deprivation Affects Visual Cortex Plasticity Through cPKCγ-Modulated GluR1 Phosphorylation in Mice

Area of Science:

• Neuroscience
• Molecular Biology
• Vision Science

Background:

• Monocular deprivation (MD) is a critical period for visual cortex development and plasticity.
• Protein kinase C gamma (cPKCγ) is implicated in synaptic plasticity, but its role in visual cortex plasticity following MD is not fully understood.

Purpose of the Study:

• To investigate changes in visual cortex plasticity after MD in mice.
• To determine the role of conventional protein kinase C gamma (cPKCγ) in visual cortex plasticity following MD.

Main Methods:

• Quantified cPKCγ membrane translocation using immunoblotting.
• Measured field excitatory postsynaptic potential (fEPSP) amplitude via electrophysiology to assess visual cortex plasticity.
• Determined GluR1 phosphorylation at Ser831 using immunoblotting.
• Analyzed retinal function with electroretinography.

Main Results:

• cPKCγ membrane translocation significantly increased in the contralateral visual cortex after MD.
• Long-term potentiation (LTP) and GluR1 phosphorylation at Ser831 were elevated in the contralateral visual cortex of MD mice.
• cPKCγ knockout downregulated these increases, indicating its crucial role.
• MD affected retinal function, evidenced by reduced a-wave and b-wave amplitudes.

Conclusions:

• cPKCγ plays a significant role in visual cortex plasticity after MD.
• Increased LTP in the visual cortex following MD may be mediated by cPKCγ-dependent phosphorylation of GluR1 at Ser831.