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CaMKII inhibitor 1 (CaMK2N1) mRNA is upregulated following LTP induction in hippocampal slices

Daniela Astudillo1, Daniel Karmelic1, Barbara S Casas2

  • 1Cell Physiology Center, Department of Biology, Faculty of Sciences, Universidad de Chile, Santiago, Chile.

Synapse (New York, N.Y.)
|April 23, 2020
PubMed

Insights

The CaMK2N1 gene is upregulated during long-term potentiation (LTP), a key process for learning and memory. This suggests CaMK2N1 may play a role in synaptic plasticity regulation.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Synaptic Plasticity

Background:

  • Calcium/calmodulin-dependent kinase II (CaMKII) is crucial for memory and long-term potentiation (LTP).
  • CaMK2N1 and CaMK2N2 are endogenous inhibitors of CaMKII.
  • CaMK2N1/2 genes are rapidly upregulated in response to fear memory acquisition/retrieval, suggesting they might be immediate-early genes.

Purpose of the Study:

  • To investigate the role of Camk2n1/2 genes in synaptic plasticity.
  • To assess the regulation of Camk2n1/2 during the expression phase of LTP in rat hippocampal slices.

Main Methods:

  • Induction of LTP in rat hippocampal CA3-CA1 connections using Schaffer collateral high-frequency stimulation.
  • Quantitative PCR to measure Camk2n1 and Camk2n2 mRNA levels 60 minutes after LTP induction.
  • Correlation analysis between LTP magnitude and Camk2n1 mRNA changes.

Main Results:

  • Camk2n1 mRNA, but not Camk2n2, was significantly upregulated 60 minutes after LTP induction.
  • A positive correlation was observed between the magnitude of LTP and the change in Camk2n1 mRNA levels.
  • This suggests a coordinated regulation between Camk2n1 expression and LTP.

Conclusions:

  • Camk2n1 is upregulated during LTP, indicating a potential role in this form of synaptic plasticity.
  • CaMK2N1 may be involved in fine-tuning CaMKII activity during LTP maintenance or regulating subsequent plasticity events (metaplasticity).
  • Further research is needed to confirm protein upregulation and localization in relevant subcellular compartments.
Keywords:
CaMK2N1CaMK2N2CaMKIILTPgene expression

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